The Masochistic Little Sister's Punishment Game

I stumbled upstairs in a daze, only to see a single room lit up. Dazed, I walked over and pushed the door open, and then… my sister, dressed in a maid outfit, was on the bed, her ass in the air facing the doorway. Because she was wearing a skirt, her cute, pink panties were completely exposed for me to see. Her hair cascaded naturally over the edge of the bed. Several ropes were wrapped around her body, her hands tied behind her back. She wore white stockings that matched her maid outfit, her ankles bound by rope, and several more strands wrapped around her legs. It took my brain about a century to process what I was seeing. She was also frozen in place. We stared at each other, stunned, for a long time. My brain slowly cleared. She was probably, maybe, definitely, into self-bondage. I felt a mix of excitement and embarrassment. Now I wouldn't have to play bondage alone anymore, but the current situation was incredibly awkward. Best to leave. As we were about to turn away, She also snapped back to reality, startled, and let out a scream. She tilted to the side, her ass-up position shifting to a side-lying one on the bed. A pair of scissors, placed beside her, was knocked over by the impact and fell to the floor. The *clatter* of the scissors hitting the floor brought me back to complete awareness. "I... I didn't see anything!" I quickly turned to slip away, but a delicate voice called out from behind me. "Sister! Come back and untie me!" Hearing this, I froze in place and slowly turned back. My sister struggled on the bed, but it seemed she had tied herself very tightly, unable to move even an inch. "Well... um... no, if you're going to play with self-bondage, why tie yourself so tight that you can't get free? Isn't that embarrassing?" You could learn a thing or two from your sister, I couldn't help but retort. "It's all your fault for scaring me when you came in! I had scissors right next to me, where did they go?" Her face was flushed red, and she looked on the verge of tears. "Th-they're over there," I pointed to the scissors, whispering. She looked under the bed and said, "I... I can't reach them. You, hurry up and untie me." Seeing her pitiful, helpless, and utterly defeated expression, I almost exploded with excitement. My sadistic control freak tendencies were piqued. "So my sister likes self-bondage, huh? And dressing up as a maid?" "No, no, no! I don't! Hurry up and untie me!" My sister looked like she was about to cry. "If you like bondage, I can actually help you," I said, sitting on the edge of the bed and watching my sister struggle helplessly. Her self-bondage was indeed quite severe; the ropes had dug deep into her flesh, and they were still taut with no slack whatsoever. "Help? Help me?" She turned her head, looking at me. "Yeah, I really like bondage too. My sister is just too cute, especially when she's tied up, wearing a maid outfit and white stockings, haha~" I grinned wickedly. Bondage was indeed one of my kinks, otherwise, I wouldn't have been so moved by the sight of my sister in self-bondage. "Untie me quickly! Otherwise, I'll... I'll..." My sister started to protest. "Eh? You're still threatening me? You're in my hands now. If you don't behave, aren't you afraid of what I might do?" "Wh-what do you want to do?" My sister stopped struggling and asked fearfully. "Nothing much, just tighten the ropes a bit more, hahaha." I picked up a rope that was still untied on the bed. "No! Sister! Go away!" "You're actually looking forward to it, aren't you?" I pointed to her wet panties beneath her. "I am not!" She quickly shifted her position, making the skirt cover her panties. "So my sister is a complete pervert." "Stop talking, stop talking, stop!" "I'm going to tie you now." I grabbed my sister, positioning her face down on the bed. Then, I bent her tied legs, brought her ankles up to her hands, and used the rope to tie her wrists and ankles together. In this way, my sister was transformed into a beautiful 'shijin-goku' (four-horse-harness bondage). "Is this position comfortable?" "Ah, Sister, let me go!" "You look like you're enjoying it, hehe." "I'm not! Pervert!" "Call me Sister, not pervert!" "Pervert!" "Not listening, are we?" I reached out and tickled the sole of her foot through her white stockings. Her white stockings were incredibly thin, showing hints of her rosy skin beneath. Such thin stockings couldn't protect her soles, so her reaction was extremely intense. "Don't, don't, don't tickle my soles!" she cried out. "Call me Sister!" "I won't! Ahhh, it tickles, it tickles so much, hahahaha!" My fingers danced joyfully on the soles of her feet. Her little feet struggled to evade my fingers. "Stop, stop, hahaha, it really tickles, hahahaha." "Sister, your laughter is so beautiful. Make me laugh a few more times." "No!" She tried hard to suppress her laughter, but couldn't hold it for more than two seconds before bursting into giggles again. "Call me Sister, are you going to call me Sister?" My fingers moved to her ribs. "Hahahaha, I can't, I can't breathe, hahahaha, Sister, Sister, Sister, stop tickling me." Hearing her call me Sister, I was ecstatic. "Alright, good girl, hehehe." I removed my hands from her ticklish spots. "Untie me quickly." My sister shook her shoulders forcefully. "Beg me~" Looking at her angry and helpless expression, I felt incredibly satisfied. "S-Sister, please untie me." After saying that, she blushed and covered her face.

Now, my sister stood in the middle of the basement, looking at me with disdain. "What do you want?" she asked. "Heh heh, because you were rude to your sister, you're going to be punished. But if you admit defeat, I'll let you go." "Hmph, impossible! What can you do to me?" I brought over a short stool and placed it directly under the water pipe on the ceiling. "Stand on it!" I commanded. "Wh-what for?" "Hurry up!" "Stupid sister~" she muttered, but obediently stepped onto the stool. I took another rope, tied it to the rope binding my sister's wrists, and then threaded it through the water pipe on the ceiling, pulling it down. I tightened the rope and secured it, hoisting my sister's hands high above her head. However, her feet were still firmly on the stool, so her wrists didn't bear much weight. Next, I grabbed another rope, bent down, and tied it around the bend of my sister's left leg. I also threaded this rope through the pipe overhead, pulled it tight, and secured it. My sister's left leg was now suspended, her left foot raised to hip level, creating a single-leg suspension. At this moment, my sister lowered her head, her face flushed, staring at the floor. This restraint left her [REDACTED] completely exposed. Although she wore pink panties, I was certain she felt deeply ashamed. All her body weight now rested on her right foot, the only one touching the ground, but that wouldn't last. With a kick, I sent the stool flying out from under my sister. She yelped in surprise, a soft gasp escaping her lips. The points supporting her body shifted from her right foot to her wrists and the bend of her left leg. Her right foot could only barely touch the ground with the tip of her big toe, unable to bear any weight. I flicked my finger against Sisi's chest, where any hint of a swell was barely discernible. "Does it hurt? If you surrender and call me 'good sister,' I'll let you down. How about it?" "Pah! Pervert, not a chance!" "Then let's begin today's punishment." I walked towards the basement door. "Wait, where are you going?" my sister called out urgently. "Hmph hmph, this is the first step of the punishment. You'll hang there alone for a few hours. Oh, and I'm turning off the lights too." I switched off the lights and walked out of the basement, making a move to close the door. At this point, only the light from the doorway illuminated the basement. Once the door was shut, it would plunge into darkness. "Wait, this..." My sister sounded a little scared. "What? Giving up?" "No! Not at all, pervert! I'm not scared!" "Good, then bye-bye~" With a bang, the basement door closed. I smirked and returned to my room. It was 7:30 PM. Six hours had passed since my sister was left alone in the basement. I returned and turned on the lights. Sisi, suspended in the center of the room, was fast asleep, her head bowed and eyes closed. "Hey, wake up, don't sleep!" I gently patted my sister's smooth, rounded cheek. "Ah! Mmm?" My sister startled awake. "Well, look at you, falling asleep. It seems this punishment was too light for you." "Tch, I told you I wasn't scared at all!" "It seems you have no intention of surrendering at all. Then the real punishment begins." It was less a punishment and more like a training session. "Pervert! Whatever, bring it on!" I picked up the bamboo stick I had used earlier to spank her soles, this time preparing to strike her chest. "Sister's breasts are so small and cute," I remarked, staring at her chest, where the front and back were almost indistinguishable.

"A secret? Ooh~ So big sister is a total masochist too!" the younger sister exclaimed, practically bouncing with excitement, as if she'd unearthed a monumental secret. "You're wrong! I can be both sadist and masochist. Today, I'm the queen!" "So... lewd! Big sister!" the younger sister said smugly. "Alright, let's go. To the basement. We have a new batch of toys today. If you win, I'm yours to do with as you please." "It's a deal! No take-backs!" The younger sister suddenly stood up, pouting. "It's a deal!" I then grabbed the note my sister had already written and, dragging my completely naked sister along, headed to the basement. I opened the basement door and turned on the light. The contents of the basement were suddenly revealed to me and Cici. "This... what is this?" Cici was so shocked she couldn't speak. Beneath a pipe hanging from the basement ceiling, there was a wooden horse. "Hmph, hmph. This is the torture you'll be subjected to today. Scared?" I asked. It was actually a small, triangular wooden prism, propped up on two stools. It was crude, but functional. "Where... where did this come from?" "I bought it online. Is that not allowed?" "This..." "Scared? If you're scared, just tell me the password quickly!" "No, I won't!" "Then please, sit on it." Hmph, hmph. Cici straddled it, then sat down on the sharp edge of the wooden horse. Although the entire triangular wooden horse was made of wood, the sharp edge was made of sharp iron. "Hiss~" As she shifted her weight onto it, she gasped. "What?" "It hurts!" My sister gritted her teeth. "Hmph, hmph. It's supposed to hurt." I lifted Cici's hands and tied them to the pipe, so she wouldn't fall off the wooden horse. Once she was secured, I stepped back a bit, watching Cici, who looked pitifully adorable as she endured the wooden horse torture. My sister closed her eyes, biting her lower lip, clearly enduring immense pain. "Tell me, what's the password?" I grabbed Cici's chin and asked, looking her in the face. "No, I won't tell you!" "Then I'll add some weight to your feet. Hmph, hmph." "Weight? What weight?" Cici asked, a little confused. "This!" I picked up the bricks I had used to prop up the stool earlier and showed them to Cici. "Wait, you're going to hang these on my feet? No! I'll die of pain!" "You have no choice." I tied two bamboo baskets to Cici's bare ankles with rope, then threw a brick into each one. "Ooh!" Cici let out a groan. "Are you going to talk or not?" I picked up another brick and dangled it in front of Cici's eyes. "No! I can still take it!" "Then let's see how long you can last." I directly threw two bricks into each basket. "Ahhh!" My sister let out a scream. "Does it hurt? If it hurts, tell me quickly!" "No... I won't!" Cici squeezed out the words through gritted teeth. I began to gently push the wooden horse back and forth, letting the sharp edge repeatedly cut into Cici's [redacted]. "Eek? That's cheating! Ahhh, it hurts!" Cici finally couldn't take it anymore and started screaming. "Oh? What's cheating about that? Hahaha, as long as it forces you to tell me the password, anything I do is justifiable!" "Pervert! Big pervert! Ahhh, it hurts!" The next torture device was specifically prepared for Cici's breasts, so I had to make them sensitive first. I reached out and grabbed Cici's two tender, pink nipples. "What... what are you doing, big sister?" "Hmph, hmph. I told you, anything I do is justifiable." I grabbed Cici's nipples and began to twist those two little strawberries, while also tugging on her [redacted]. "Ooh~ Big sister is a bad, bad girl. This... this feels so strange!" "Strange is good. Hmph, hmph, hmph." I could feel Cici's nipples becoming engorged and hard. It was time for the next stage. "Next~" I picked up a leather whip from the nearby table. "Be careful with your chest." "You... where did you get that?" Cici stared fearfully at the whip in my hand. "Of course, it's from that pile of toys. Are you going to talk, or should I whip you?" Cici gritted her teeth and said, "I won't!" "In that case, don't blame me for being impolite." "Swoosh~" I swung the whip, and it whistled through the air.

"Sister, keep going!" Hearing Xixi's encouragement, I felt a little more motivated. Gritting my teeth, I managed to suppress a moan. "Still got some fight in you, huh? Let's see how long you can last," Kexin turned the stun gun up to level 4. "Ahhhhhh!" The previous sensation was like someone pricking my nipples with a needle, but this was like being jabbed with a red-hot steel needle. Xixi later told me that my body had arched backward on the bed, I was covered in sweat, my muscles were clenched tight, and I was screaming non-stop. Suddenly, the intense pain vanished. I collapsed on the bed, gasping for air. Turning my head to see what happened, I realized Kexin had turned off the stun gun. "If you beg for mercy, I won't turn it back on," Kexin's hand hovered over the switch, making me tremble. "I... I don't... Ahhhhhh!" That's cheating! Before I could even finish my sentence, Kexin turned the stun gun back on. "Hmph, this is what happens when you don't listen," Kexin cranked the stun gun up to level 5. "Eeeeeeekkkkkk! No! Turn it off! Ahhhhhh!!!!!" Level 5... that feeling... it was truly worse than death. I even wondered how Xixi had endured it for so long. I felt like my nipples were going to be completely ruined. Compared to this agony, the pain from the clamps earlier was nothing. With a "click," the current disappeared again. "How was it? Comfortable?" "No... don't... don't..." I stammered, unable to form a coherent sentence. "Did you beg for mercy? Or should we continue?" Kexin's hand slowly reached for the switch. "Sister, don't hold on any longer, just give up," Xixi seemed unable to watch anymore. "No, I won't..." Kexin sighed and said, "Then I'm sorry." That excruciating pain flooded my body again, but the torment escalated. Kexin, without a shred of mercy, turned the stun gun to level 6. I was completely broken. The tears that had been gathering in the corners of my eyes finally streamed down my face. But the pain left me no room to consider shame. Hold on, hold on... but I really couldn't hold on any longer. "Ahhhhhhh! Stop! Stop! Turn it off! Ahhhhhh, I surrender! 'Begging for mercy!' 'Please, please turn it off!'" I realized how insignificant shame was in the face of such torture. Kexin immediately switched off the stun gun and said, "Nine and a half minutes. Unfortunately, you were only half a minute away from success. Too bad." At that moment, I couldn't care less about what she was saying. I was just reveling in the hard-won relief from the pain in my chest. Even though the punishment had stopped, I was still lying on the bed, tears streaming down my face. I might have felt ashamed before, but after enduring such brutal punishment, I no longer cared about anything. Kexin removed the clips from my nipples. I looked down; they were just a little flattened, but otherwise unharmed. When I was being electrocuted, I thought they would be completely fried. "Alright, then Xixi lost. According to the rules, you're mine for a day." "I... I'm sorry, Xixi." "It's okay, Sister. And, you should be apologizing to yourself, shouldn't you? You're going to fall into Kexin's clutches for a whole day." Xixi said. "Huh!? Wait, wait, wait, what are you going to do to me?" "You'll find out when the time comes!" Kexin said. "You two rest up. I'm leaving now. Bye." Kexin untied the ropes binding me, put them back under the wardrobe, and left. "This... this woman is truly terrifying. Why didn't I realize how scary she was when I was little? What has she been through in the years we've been apart?" Thinking about Kexin's demeanor earlier sent a shiver down my spine. "Sister, are you okay now? Should I help you rub your nipples?" "No, no, no, no need. The more I rub, the more it hurts. It's better not to touch them at all. By the way, what did Kexin mean about the things in her room?" "Oh, Kexin told me she's actually very interested in this kind of BDSM and torture. Interrogation falls into that category, so she's done some research," Xixi said. "So she told me she has a lot of tools or toys at home for her research, and she's been looking for someone suitable for her research." "This... wait, so she... she's going to use me..." I couldn't help but feel a chill. "Uh... who knows? It's your own fault, Sister. Who told you not to last 10 minutes?" "Hey! How can you blame me? Isn't this all Xixi's fault?" "Hmph! Sister, you just have no willpower. You agreed to be interrogated by Kexin. How long did I endure? How many levels did I go through? I even wet myself from the electrocution back then." "This... I don't care. Anyway, for the next interrogation, you better watch out. I'm going to get my revenge!" "Hmph, who's afraid of who? Bring it on!" "Fine! You better be careful." "Tch, get real. With Sister's personality, you wouldn't dare use any really harsh methods on me, would you?" Xixi said dismissively. "How about this? If you succeed in the next interrogation, I'll give Sister a reward, okay?" "Hmm? What reward?" "The same thing, a whole day. I'll let Sister play with me however she wants. Tools, toys, whatever she wants. How about it?" "So? Sister, do you agree?" "With such generous terms, how could I possibly refuse? Hehehehehehe." "Alright, Sister, are you feeling better? It's time for dinner! Go make something to eat!" "I'm fine, I'm fine now. I'm going to cook." Although my nipples still hurt a little, it didn't affect me at all. As I walked out of my sister's room, I felt my underwear was a little wet. Perhaps, without realizing it, I had also wet myself from the electrocution...

After dinner, my sister said, "Later, I'll have you come to my room when I'm ready, understand?" "Huh? Do I have to tie you up in your room again before going to the basement, or rather, the interrogation room?" "Of course, we need that kind of atmosphere." "Alright, I get it." "Naughty sister~" My sister said this and went upstairs. I took this opportunity to make some preparations in the basement. Oh, and I need to lock the door to prevent that girl, Kexin, from barging in again. A while later, my sister messaged me on QQ saying she was ready. Just as I was ready too, I went to her room. When I opened the door, my sister was waiting for me, completely naked. My sister handed me a piece of paper and said, "This is the password for today's interrogation. I'm ready, sister. You can tie me up now." "Okay!" I took the paper, then skillfully took out ropes from under the cabinet, tied my sister's hands behind her back, and took her to the basement. "Since my sister has offered such generous rewards, today might be a bit intense. Are you ready?" I asked. "Mhm!" My sister nodded, her eyes full of anticipation, not a trace of fear. "Alright then, I won't hold back." As I said this, I pulled Sisi's hands behind her back, crossed them tightly, and bound them. Then, I used another rope to connect her neck, firmly securing her arms. The rope dug fiercely into her flesh, wrapping around the base of her [REDACTED] several times. Sisi's once flat chest was cinched into a葫芦 shape, and her nipples stiffened with arousal. "Ah! It's too tight! My chest is going to burst! It hurts so much!" Sisi cried out. "This is just the beginning, and you're already giving up?" I tightened the rope a little more. "No way! Bring it on!" Sisi puffed out her chest. I continued to secure Sisi's waist to the chair with a belt. Then, I tied her thighs and calves with two separate ropes and firmly secured them to the armrests of the chair with tape. "The ropes are so tight! I can't move at all! Ah!" Sisi tried to writhe, but the ropes didn't loosen; instead, they dug in deeper, eliciting moans from her. "What should I use to gag you today? I've been using stockings a lot lately, and it's getting a bit boring. Oh, right! I'll use this!" I thought for a moment and pulled out a large, black, cylindrical rubber gag. "What?! This is too big!" Sisi was startled and couldn't help but exclaim. I grabbed Sisi's cheeks and forcibly shoved the gag into her mouth, then secured it. "Mmmph mmmph!!!" Sisi felt like her jaw was dislocating. The huge gag filled her mouth, directly poking her throat. With everything prepared, I took out a box of ointment and evenly applied it to Sisi's breasts, clitoris, and her three holes below. "Sister... what... is this?" Sisi's voice was muffled. I picked up the ointment and waved it in front of my sister. "This is a special purchase from Japan, just for you."

A moment later, Kexin and I returned, carrying a pyramid-shaped iron object. The pyramid's apex was extremely sharp, and the whole thing was about a meter tall. "What... what is this?" I asked. "You don't recognize this? The Cradle of Judas, a medieval torture device. It's been upstairs all this time, I almost forgot." "You... you have something like this at your place? Wait, why did you bring it out?" "For your stubborn sister to use!" "Ah? That's really not necessary, we just played yesterday." The Cradle of Judas is a torture device specifically for torturing [REDACTED]. "It's fine, I think Xixi can handle it. Her tolerance is so strong." "Wuwu? Is it over? Didn't I say I wouldn't?" "So... let's continue, change the torture. Untie Xixi's ropes." "Aiya, I'm untying them. You tied them too tight!" Partly because Kexin had tied them tightly, and partly because my sister had struggled fiercely, after untying the ropes, distinct rope marks were visible on her wrists and ankles. I helped Xixi down and then guided her to Kexin. Kexin took out ropes and tied Xixi's hands behind her back. Then, she spread her legs apart, tying a rope around the bend of each knee, and connecting them to the rope binding her hands, forming a single strand. Kexin then handed the rope to me, instructing me to hang it on the ceiling pipe. This way, by pulling the rope, Xixi could be hoisted up, in a very humiliating M-shaped spread of her legs. When suspended like this, her private parts would be at the lowest point. Soon, Kexin would manipulate the rope to make Xixi's private parts land on the pyramid's sharp tip, thus using the Cradle of Judas. "Come on, hoist her up!" Kexin commanded. "I... this rope isn't light, do you want to exhaust me?" I asked. "Then let's do it together." Kexin moved closer to me, and together we grabbed the rope. "Pull!" "Wuwah!" With our combined effort, Xixi cried out in surprise and was hoisted up, suspended above the triangular pyramid chair. "Release!" Then Kexin and I loosened our grip. Xixi fell from about 10cm above the tip directly onto the apex. The sharp point instantly pierced into my sister's [REDACTED]. "Aiya, it hurts, it hurts, it hurts! My downstairs! My downstairs is going to be ruined!" "Are you going to talk? What's the password?" Kexin didn't forget to interrogate. "I... I forgot... Ahhh..." "You forgot the password to your own phone? Come on, pull!" Xixi was hoisted up again, and then fell onto the triangular pyramid once more. "Ahhhhh! Stop, stop, stop, it hurts, it really hurts!" "The password!" "I, I, I, I... Ahhhhh, it hurts, wuwuwu!" "Keep pulling." For the third time, my sister fell down. This time, her cries were even louder. But Kexin felt it wasn't enough. She brought the large iron ball that she had used to threaten me earlier and, without a word, hung it on my sister's ankles. "Wuwu!" The moment the weight of the iron ball was added to my sister's feet, she let out a mournful cry. "Alright, now, pull her up again." My sister was hoisted up again. This time, with the added weight of the iron ball, it took both of us considerable effort to lift her. I could clearly see my suspended sister's body trembling slightly, likely from fear. It seemed this torture was indeed very painful. "Release!" Kexin and I let go, and Xixi fell onto the tip of the triangular pyramid again. The sharp point once more pierced into my sister's [REDACTED]. "Ahhhhh! I'll say it, I'll say it, I surrender! It hurts so much, the password is xxxxxx." "That's more like it," Kexin said happily. She quickly stepped forward and removed the iron ball from my sister's feet. Then, Kexin and I worked together to bring my sister down to the ground. "Hoo~ Hoo~" My sister, exhausted, immediately sat on the traction bed, just like Kexin had after getting off the wooden horse. "Let me see, is your downstairs seriously injured?" Kexin said, sitting next to Xixi. "Wuwu, it really hurts." My sister spread her legs, parting her thighs to allow Kexin a clear view of her [REDACTED]. "There's a little bleeding, but it's not too serious. We'll disinfect it later. And you need to be careful about what you eat recently." "Un... Understood... It feels a bit awkward being cared for by my sister like this." "Uh... It's okay, it's all because of me, after all." It was quite touching how these two cared for each other, it was hard to imagine that just moments ago, one of them was torturing the other. "Hmph hmph." "Alright, it's getting late. We'll head home now. Kexin, help me get my clothes." Xixi said.

The Tiger Bench torture has a unique characteristic: as time passes, the pain not only fails to diminish but gradually intensifies. Unlike other tortures where the nerves in the affected area eventually go numb, causing the pain to subside, this method ensures sustained agony. Historically, this torture was typically administered for one to two hours. This time, I intend to let Cici experience the full power of the Tiger Bench. After placing two bricks, I interrogated her again, but Cici remained silent. I then turned and left the basement, abandoning Cici alone with the two bricks beneath her legs. Half an hour later, I returned to the basement. As soon as I opened the door, I saw Cici with a face contorted in agony. "How is it? Does it hurt?" "Mmmph~ It hurts~ It hurts so much~" "Then will you confess?" "Pah! No!" "Oh? Still unwilling to confess? Then I'll have to add another brick." I picked up the third brick and, with great effort, slowly lifted Cici's legs. The moment her heels were raised by the height of one brick, I seized the opportunity and wedged it in. "Uwaaah!" My sister immediately tensed her body and let out a groan. Her slender legs, bound to the Tiger Bench, trembled slightly. A bead of sweat trickled down her cheek, landing on her fair thigh. "If you don't speak, you'll have to endure this for a while," I said, stroking Cici's thigh. The ropes dug deeply into Cici's knees, binding her thighs tightly to the bench. Her lower legs were bent upwards at a horrifying angle, leading to a pair of cute, tender, pink feet resting on the bricks, stretched taut. I left the basement again, this time not returning for nearly an hour. As I pushed open the basement door this time, I heard my sister's ragged breaths and moans of pleasure and pain. Seeing me, Cici immediately cried out, "Quick, take me down! It hurts!" "Hmph, hmph, how is it? Will you confess? Only then will I take you down." I walked over to Cici, watching her writhe in pain. "Mmm, I... I won't... Mmm~ It hurts so much~" Even after an hour, Cici's legs were still trembling slightly. This is the terror of the Tiger Bench; enduring such pain for an entire hour. Because of the way she was bound, leaning forward this time, the pain from the three bricks was far more intense than before. Cici was now covered in sweat from the agony. "If you still won't speak, then it's time for the fourth brick." "Mmm! No, no!" Cici's eyes were filled with terror. "Then speak quickly!" "But... I can't... Mmm!" Still unwilling to confess, I had no choice but to add the fourth brick. I grabbed the ropes binding Cici's ankles and pulled upwards with all my might. Perhaps because the binding at her knees was tighter this time, even with all my strength, I couldn't lift her legs high enough to insert another brick. Despite this, Cici was already crying out in pain. "Uwaaah! It hurts, it hurts, it hurts, ahhhhhh!" Cici threw her head back and screamed. Seeing that I truly couldn't fit a fourth brick, I had to give up. I loosened the ropes on my sister's feet and returned them to the three bricks. Cici merely whimpered and fainted. I removed the remaining three bricks and splashed a basin of water on Cici to wake her. She fluttered her eyelids and whimpered again, regaining consciousness. Just as in a real interrogation, I gently lifted Cici's chin with my finger, staring into her face, and asked, "Will you speak? Where does your sister live?" "I... I won't tell you!" Her voice was weak but clear. "Very well." I picked up a set of toe clamps from a nearby table. I had bought them online. Although I had clamped my sister's toes before, that was with chopsticks. These clamps, however, were professional torture devices, with six long metal strips fixed on two screw rods, tightened by nuts on the outside. This way, I wouldn't have to exert any effort myself. I fitted the clamp onto one of Cici's feet, without further ado, and began to tighten the nut, pressing down on her toes. Soon, the metal strips bit tightly into the bones of her five toes, and she began to groan softly in pain. "Will you speak? If not, I'll keep tightening!"

The electrified spiked wheel rolled over Sissi's soles, then her entire feet, before continuing to her toes and the tops of her feet, then to her other foot, spreading the agony of the electric shocks across both of Sissi's feet. Finally, under the continuous electric shocks combined with the agony of the crucifix position and the sustained bending of her waist in the opposite direction, Sissi finally lost consciousness from exhaustion, her head slumping to the side. At the same time, she lost control of her bladder again, and [REDACTED] trickled onto the floor. There were a bit too many tortures used today. Normally, my sister would have confessed long ago. I don't know why she's been so resilient today. Fine, the interrogation for today will end here. The next round of torture will be tomorrow. I lowered Sissi down and splashed water on her face to wake her up. The awakened sister opened her eyes, tried to get up, and then collapsed back onto the floor, looking completely drained of strength. I brought some dinner and fed her, then gave her water. After not drinking all day, Sissi was parched and drank a lot, a lot of water. Finally, she regained some of her strength. After I put her top back on, I said to her: "Tonight won't be very comfortable for you. You better think carefully." "How uncomfortable can it get? I'm not afraid!" "Still so stubborn! I want to see if you're really not afraid!" I took out some rope, tied her hands behind her back, then had her sit cross-legged on the floor. I then bound her legs with rope. Finally, I made Sissi lower her head as much as possible, until her nose was very close to her feet, then I looped a rope around her neck and the back of her head, tying it to her feet, forming a shrimp-like bondage. With the shrimp position, there might not be any special feeling at first, but as time goes on, being stuck in this position will become increasingly unbearable. "Lastly, given that you've wet yourself multiple times in the interrogation room today, we'll have to use a special method." I took out a rubber [REDACTED] plug and inserted it into Sissi's [REDACTED], then tugged it to ensure it was secure. "Alright, enjoy yourself tonight. Don't forget, you drank a lot of water earlier, hahaha." "Hey! Wait! Sister! Stinky sister! Woo!" Chapter 19: Enema The sky was still hazy, half dark and half light outside the window. Early in the morning, I immediately went down to the basement. I don't know why Sissi was able to hold out for so long this time. Normally, she would have confessed countless times by now. It's been bothering me. When she saw me open the door, Sissi, still in the shrimp bondage, immediately looked at me with the same expression of seeing a savior as yesterday. "Quick, quick! I can't hold it anymore! Let me pee!" "Pee? Just pee on the floor then." "I... how could I... take that thing out!" "Hmph, I'll definitely let you pee, but you'll have to cooperate." First, I untied her shrimp bondage, but to prevent her from moving around, I handcuffed her hands to the wall. Then, I spread her legs apart and tied them to the sides with rope, making her sit on the floor in an M-shaped spread-leg position. After that, I brought the metal plate that I made Sissi "dance" on earlier and placed it on the floor in front of Sissi's [REDACTED]. Next, I brought out the electric shock device and attached the two clips to the metal plate and Sissi's [REDACTED] respectively. "Alright, you can pee now. However, if you do, you'll be electrocuted." As I spoke, I turned the electric shock device to its maximum setting, level nine. If Sissi peed, the urine on the floor would conduct electricity through her [REDACTED], completing a circuit and causing an electric shock. "You! You!" "Alright, didn't you want to pee?" I slowly pulled out the urethral plug that was blocking Sissi's urethra. The moment the urethral plug left Sissi's urethral opening, only a tiny bit of urine trickled out. Sissi managed to hold it in. "What? Didn't you want to pee?" "You... bastard! Turn off the electric shock device!" Sissi gritted her teeth, holding back the urge to urinate. "Turn it off? Of course, I can, but you have to answer my question." "Pah! I won't say anything! Don't think you can make me do anything to my sister!" "Then hold it. Let's see how long you can hold it." "Woo~" And so, I watched as my sister held it in for over 20 minutes. She's really resilient, still able to endure this. I truly admire her. However, after such a long time, I couldn't wait any longer. "It seems you need some help to pee, don't you?" "Woo~ Pah! I... I don't need... your help!" Sissi said intermittently. "Seeing how uncomfortable you are holding it, let me help." I took out a feather plucked from a feather duster.

The next morning, before my eyes were fully open, I felt like I couldn't breathe. I lifted my head and realized my sister's calf was pressing on my chest. I lifted her leg to get up, and the movement woke her up. "Sis... sis... what time is it?" Cici looked sleepy and stretched. I hadn't slept well last night either, squeezed into the same bed with my sister. But just last night, I suddenly thought of a great plan, so I hurried to wake my sister up, without telling her what the plan was... My sister and I got up in a hurry, slipped on our slippers, went to the kitchen to heat up breakfast, and then went to wash our faces and brush our teeth. After washing up, we quickly ate breakfast and returned to the bedroom. I took off my sister's pink, semi-transparent slip dress and walked to the closet. I opened it and scanned the underwear inside, selecting a white lace bra and a pink lace thong. The thong had exquisite lace on the sides and a piece of pale pink satin in the middle. I also picked out a pair of ultra-thin nude pantyhose. Closing the closet door, I pushed my sister against the mirror by the door and put the straps of the white lace bra over her arms, fastening it in front. I hooked the bra in the back and adjusted the straps and position of the bra. This bra had a small pocket inside the cups for padding. I squeezed the silicone breast forms into the pockets and placed them on either side of my sister's bra, then fastened the clasp. Her chest now presented a [X], and looking in the mirror, my sister already had a noticeable pair of [X]. No wonder this brand of bra is so popular! I caressed my sister's trembling fake breasts, feeling a sense of [RF] pulsating on her chest. I then had my sister put on the pink lace thong and placed an extended and thickened sanitary pad inside. This way, I wouldn't have to worry about [X] soiling her clothes. I then took out a black box from under the bed. We then went down to the basement. I opened the black box, revealing a metal undergarment – a chastity belt. I then fastened the waistband of the chastity belt around my sister and adjusted it to the most suitable size according to the instructions. Then, I threaded the remaining metal parts through her crotch and inserted two exquisite small vibrating eggs inside. I then fastened the buckle at the abdomen. I picked up a delicate little lock, and with a "click," my sister knew she was locked into this metal underwear. She felt a cool sensation spreading from below. Because I was slightly greedy and set the entire chastity belt a bit too small, she felt the cold, hard, and unique pressure of the metal around her waist and between her legs. Unintentionally, a sense of control suddenly permeated my entire being. I suddenly felt that my sister had completely become my private plaything. After my sister took a few steps, she realized that the two small toys and the chastity belt were constantly pressing against her [X]. If she just stayed still, it might have felt somewhat comfortable, but as soon as she moved, it was like stepping into hell! My sister had no idea how to walk. Every step brought immense pressure to her [X]. But this was just the beginning. I opened a nearby box and took out the items I had prepared for today. "Want to try, Cici?" My sister looked confused. She looked at the pile of things I took out of the box and couldn't quite figure out what they were. "This is a human harness. We'll be using it soon," I said kindly, seeming to understand her confusion. "It's just some simple clothing and light bondage." I held out two small, boxing-glove-like covers and gestured for my sister to extend her hands and put them on. Then, I tied straps to the ends of the covers and locked them with small locks. Next, I signaled for my sister to place her hands at her sides and then attached the harness. The next step was to bind her. I wrapped the straps around her arms and chest, then around her elbows. I then tightened my grip on her wrists and tied a secure knot, finally binding her hands tightly behind her back. "Alright, that went more smoothly than I expected. Does it feel tight?" I asked kindly, inquiring about her current sensations. My sister tried to move her arms and felt that she could move them slightly, but she couldn't escape. "If you want to secure it firmly, the two upper straps should be a bit tighter," my sister honestly suggested improvements. "Cici, you're so good," I couldn't help but praise her. Immediately, the two upper straps were reinforced. Now, the human harness was completely bound to my sister's body, and every muscle in her upper body was immobilized. Then, I put a 5-inch-high leather collar on her, perhaps like a dog's leash. Once it was on, she had completely transformed into a pet whose upper body was immobile. "Sister, can you breathe freely?" I seemed a little worried she might suffocate. "Yes, sister. It's a bit tight, but I think I can bear it. Can you release me now?" Seeing the full harness on me, I thought this must be the end. "No, something is still missing." Saying that, I took a gag from my back pocket. It was a ball about 3 inches in diameter with two straps attached. "Cici, open your mouth." I commanded, holding the gag towards my sister. My sister opened her mouth, allowing the gag to be firmly placed inside, and the straps were securely tied. With a "click," the straps on the gag seemed to be locked as well. "Mmmph mmmph." My sister suddenly felt panicked. "Can you still breathe?" I asked again. Although a gag was added, there were small holes in it, and my sister's nose was still clear. So, I waved my hand to indicate yes. At the same time, my sister continued to make "mmmph" sounds, hoping I would remove this attire. "Do you think your upper body is completely immobile?" I continued to ask. My sister still wriggled and made muffled sounds. But then, my sister saw me take a small black remote control from my shirt pocket. With a sinister smile, I pressed a button, and my sister's heart skipped a beat. A buzzing sound instantly entered my sister's mind. Her breathing became rapid because around her [X], which was tightly enclosed by the chastity belt and locked by the two vibrating eggs, accompanied by the buzzing sound, came waves of incredibly comfortable vibrations that even made her entire body tremble. The tingling [X] emanating from her [X] and constantly intensifying, mingled with the growing fear spreading within my sister's heart. She felt like she was about to collapse. After a series of vibrations, my sister, who could barely breathe, could no longer make any sound to answer. But her eyes clearly told me the answer. My sister had completely broken down and started crying in pain. But I ignored her. I pushed her to the ground and, amidst the continuous buzzing, wantonly caressed her body. Under the intense humiliation, my sister instinctively struggled with her legs, but it was useless. Cici was like a helpless girl being wantonly violated. A cool sensation spread from below. My sister felt that her lower body was soaked, and her struggles lessened. I picked up the remote control and turned the power to maximum. At this moment, my sister felt the vibrations from her [X] becoming stronger and stronger. The only sound audible in the room was the ever-increasing buzzing. However, perhaps because of the sanitary pad, her underwear below wasn't wet. But my sister still tried to clamp her legs together, hoping to stop the intensifying vibrations. But the vibrations from the small toys hidden beneath the thick steel plate of the chastity belt couldn't be stopped by simply clamping her legs. Yet, my sister continued to adjust the position of her legs, repeatedly bringing them together, trying to alleviate the vibrations, unaware that such movements actually looked more helpless. Then, my sister suddenly felt a powerful force from her feet, as if someone was trying to pry apart her tightly clamped legs. "No, don't, sister," the sister lying on the ground pleaded weakly.

"A little insurance," Kexin showed us the clasp. "Once the device is in place, this clasp secures at the pubic bone and cannot be removed without the key. This means you'll completely lose control of your urination until the agreed-upon time." Yaxin's breathing quickened noticeably, a flicker of fear in her eyes, but it was quickly replaced by resolve. "I accept." This preparation was even longer than the last. I could feel Yaxin's muscles tense all over, and she trembled uncontrollably when the cold metal touched her skin. "Relax," I whispered, "the more tense you are, the more it will hurt." Kexin's movements were more practiced than before. She smoothly inserted the device into Yaxin and then secured the small clasp above her pubic bone. She casually pocketed the key. "Now, it belongs to me," Kexin said, tapping the clasp lightly, causing Yaxin to flinch. For the first half hour, Yaxin remained remarkably composed. She even chatted with us normally, discussing plans for next week's club activities. But gradually, her posture shifted, her legs unconsciously tightening and then loosening. "How does it feel?" Kexin asked deliberately. Yaxin managed a weak smile. "It's okay, just... a bit strange." Xixi observed from the side, her expression complex. She whispered to me, "There wasn't this clasp last time." I nodded. Kexin was always pushing boundaries, not just the participants', but the club's rules themselves. An hour later, Yaxin's composure began to crumble. Fine beads of sweat appeared on her forehead, her breathing shallow and rapid. Her fingers incessantly twisted the hem of her clothes, her knuckles turning white from the force. "Kexin..." she finally couldn't help but speak, "I'm feeling... not very comfortable." Kexin, organizing club documents, didn't look up. "Describe it specifically." Yaxin bit her lower lip, searching for words. "It's a pressure... and itchy. The feeling... it's just getting stronger. I can't stop thinking about it." "This is normal," Kexin's tone was as calm as if discussing the weather. "Your body is learning to accept this state." Another half hour passed, and Yaxin could no longer maintain her posture. She was curled up in the chair, her cheeks flushed with an unnatural redness. Her gaze became unfocused, and she occasionally let out faint whimpers. "Kexin, please..." her voice trembled, "I really can't take it anymore..." Kexin finally put down her papers and knelt in front of Yaxin. "Tell me, what do you want most right now?" "I want... I want to go to the bathroom..." Yaxin was on the verge of tears. "But you can't, can you?" Kexin lightly touched the clasp. "The key is with me, and I said it wouldn't be unlocked for another three hours." Yaxin closed her eyes in despair, tears finally falling. Just then, the door to the club activity room was pushed open. Professor Lin stood at the entrance. He was a psychology professor at the school and the club's faculty advisor. His sharp gaze swept across the room, finally landing on the curled-up Yaxin. "It seems I've interrupted your 'experiment'," his tone was unreadable. Kexin stood up, composed. "We're simply exploring the boundaries of bodily sensation, Professor." Professor Lin approached, observing Yaxin's state closely. "Boundaries of sensation?" he repeated softly. "Or boundaries of control and obedience?" His words instantly froze the air in the room. Professor Lin turned to me. "May I see the device?" I glanced hesitantly at Kexin, who gave a subtle nod. I retrieved a spare device and handed it to Professor Lin. He examined it carefully, his fingers tracing the metal surface. "An ingenious design. Establishing dominance by controlling the most basic physiological needs. Primitive, yet effective." "We are doing this voluntarily," Kexin emphasized. "Oh, I have no doubt," Professor Lin returned the device to me, his gaze still fixed on Yaxin. "But voluntary submission can sometimes be more... thorough than forced compliance." He walked over to Yaxin and asked softly, "Do you want to stop?" Yaxin looked up, her eyes blurred with tears, her lips trembling, but she couldn't speak. Her gaze shifted to Kexin, as if seeking permission. In that moment, I realized Professor Lin was right. Unbeknownst to us, Yaxin had completely surrendered control of her body to Kexin. "It seems more time is needed," Professor Lin said meaningfully. "I'll return later." After he left, the activity room fell silent, broken only by Yaxin's occasional sobs. Kexin looked at Yaxin, a complex light flickering in her eyes. She reached into her pocket and pulled out the small key. "It's not time yet..." Yaxin protested weakly. Kexin ignored her, directly unlocking the clasp and gently removing the device. Released, Yaxin immediately slumped to the floor, gasping for breath. "Why..." she looked at Kexin, confused. Kexin knelt down and stroked her hair. "Because I wanted to see what you would choose when given freedom." Yaxin froze, her gaze shifting between Kexin and the device. After a long moment, she reached out and lightly touched the cold metal. "Can I... keep it?" Kexin's lips curved upwards slightly. "Of course." When Kexin and I were alone in the activity room, I couldn't help but ask, "What exactly were you testing?" Kexin looked out at the darkening sky. "Testing the limits of control. Not physical control, but psychological." She turned to me. "Today you saw that even with the device removed, the clasp unlocked, the control remains. That's the most fascinating part." "Professor Lin seemed to see right through it all."

"Mmm... Nn... Woo..." It was the sound of someone desperately trying to vocalize while their mouth was forcibly gagged, unable to form clear words, only managing to squeeze out broken, despairing whimpers. The sound was faint, yet carried a heart-wrenching sense of struggle, echoing in the dead silence of the space. The three of us froze instantly, our blood seeming to turn to ice in that moment. "Who's in here?" Kexin was the first to react, her voice laced with high alert as her right hand quickly reached for the light switch by the wall. "Click!" The old fluorescent tube overhead flickered a few times, then suddenly blazed to life. The stark white light instantly dispelled the darkness within the room, and exposed the horrifying scene in the center of the activity room, completely uncovered and raw before our eyes! In the center of the activity room, at some point, a crude but exceptionally sturdy wooden cross had been erected! And bound to the cross with ropes was a girl! The girl was bound in a complex and tight knotting technique. The off-white ropes dug into her fair skin, creating countless diamond-shaped patterns that sank deep into her flesh. The ropes were particularly tight around her chest, constricting and compressing her not-so-ample breasts, clearly outlining their shape. Her breasts visibly protruded under the pressure of the ropes. One rope, acting as a "straddle cord," cruelly passed between her legs, digging deeply into her most private parts, leaving a mark that was impossible to look at directly. Her wrists and ankles were secured to the crossbeam and uprights by black leather restraints with metal buckles, rendering her almost completely immobile. She wore a black, opaque leather hood that covered most of her face, leaving only her nose tip and her whimpering mouth exposed. A red, spherical rubber gag was stuffed into her mouth, saliva uncontrollably spilling from the corners of her lips and trickling down her jaw. Her hair was somewhat disheveled, sweat-soaked strands clinging to the edges of the hood. Even though her full face was obscured, the familiar figure, the faintly visible jawline, the color of her hair... "Yaxin?!" Kexin gasped, her face etched with shock and disbelief. Xi Xi and I were utterly stunned, our minds blank, completely unable to comprehend the surreal, nightmarish scene before us. How could Yaxin be here? By whom? Bound here in such an extremely humiliating and painful manner? Just as we stood frozen by the shock of the sight, a deep male voice, laced with a distinct hint of mockery, emanated from the small storage room at the far end of the activity room. Accompanying the voice were slow, clear footsteps, and... the cold, grating sound of metal chains dragging across the concrete floor, "clank... clank..." "It seems my dear guests have all arrived." We whipped our heads around, looking in the direction of the voice. Professor Lin emerged slowly from the small storage room. Today, he wasn't wearing his usual sharp suit, but a set of deep blue, soft-looking loungewear. A strange smile, a mixture of absolute control and pleasurable enjoyment that we had never seen before, played on his lips. In his right hand, he loosely held a shimmering silver metal chain, about as thick as a finger. The other end of the chain extended outwards, connected to a black leather collar that was tightly fastened around— a slender girl's neck, completely naked! Like Yaxin, this girl wore a black leather blindfold that completely obscured her vision. Her snow-white skin was strikingly stark under the pale fluorescent light. Her body was well-proportioned, with long, straight legs. Even more shocking were her "adornments"—on her perky breasts, the tips of her two rosy nipples were clamped with small, exquisite metal clamps, each adorned with a tiny silver bell below. With every subtle tremor of her body, they emitted an almost inaudible "ding." Behind her rounded buttocks, a furry anal plug, fashioned to resemble some animal's tail, was deeply inserted into her rear, the tail end dangling down, swaying slightly with her movements. This girl was—Yuhan! "Yuhan?!" Xi Xi cried out in terror, covering her mouth, her voice clearly choked with sobs. An icy chill shot from the soles of my feet to the top of my head, my blood seeming to freeze. What in the world was going on? Professor Lin? The usually gentle and eloquent psychology professor who lectured so eloquently on stage? Kexin's face instantly turned ashen. She lunged forward, demanding in a sharp tone, "Professor Lin! Did you do this?! What have you done to Yaxin and Yuhan?!" Professor Lin stopped, his gaze slowly sweeping over the shocked, angry, and terrified faces of the three of us. The strange smile on his lips widened. "As you can see, isn't it quite clear, Kexin?" As he spoke, he gave a slight flick of his wrist, tugging the chain in his hand. Pulled by the force, Yuhan stumbled forward a step, letting out a suppressed whimper filled with pain and shame from her throat. Her naked body trembled uncontrollably from the cold, fear, and humiliation. "I don't understand! What... what is this? Some kind of extreme game?" Kexin's voice trembled with extreme anger. "A game?" Professor Lin chuckled as if he had heard an incredibly amusing word. "You could see it that way. A game of absolute obedience, of mind and body domestication, of complete transfer of ownership... the ultimate game." His gaze suddenly became sharp and cold, like a scalpel scraping across our skin. "Now, Yuhan and Yaxin have officially become my property. The two of them will undergo systematic and rigorous training here until they are completely polished into perfect, obedient bitches who only know how to follow orders, becoming my exclusive, exquisite, and docile human toys." "You're insane! This is a crime!" Kexin shouted in disbelief. "Let them go immediately!" Xi Xi and I also snapped back from our initial extreme shock. Intense anger and the determination to rescue our companions surged through our bodies. We stared intently at Professor Lin, and the chain in his hand, symbolizing control and enslavement, our hearts pounding wildly in our chests. We had to find a way, we had to save Yaxin and Yuhan from this man who appeared gentle but was in reality a demon!

With a gasp of terror, we spun around. Emerging from the shadows behind the door, two imposing figures now stood silently. Clad in black bodysuits and balaclavas that revealed only their eyes and mouths, they were like iron towers, blocking our only escape route. Professor Lin's smile twisted into something more sinister, colder. He regarded us as prey caught in a trap. "What... what do you want?!" Kexin demanded, her voice laced with a tremor she couldn't quite conceal. Before she could finish, the masked man behind her moved with lightning speed. He seized Kexin's arms, twisting them backward with brutal force. "Ah!" Kexin cried out in pain, her body seized. She struggled wildly, kicking her legs. "Let go of me! Who are you?! What do you want?!" Xi Xi and I panicked, rushing to help, but the other masked man stepped forward, grabbing each of our arms. His grip was like iron clamps, impossibly strong, rendering us immobile. "Mei Ting jie! Xi Xi!" Kexin cried out, struggling, but to no avail. The man holding Kexin, clearly professionally trained, produced a thick coil of rope. With practiced ease, he folded it in half and placed the loop around Kexin's nape. The ends passed under her arms and began to wind tightly around her limbs, from wrist to shoulder, seven or eight times. The rope dug deep into her flesh, eliciting whimpers of pain. He then brought her bound wrists together behind her back, securing them with a knot. Pulling the remaining rope upward through the loop at her neck, he yanked hard. "Ughhh!" Kexin screamed. Her hands were hoisted high behind her, almost level with her neck. Simultaneously, the ropes binding her arms and torso tightened, inflicting excruciating pain. She stopped struggling, her body trembling violently, cold sweat beading on her forehead, her face ashen. This binding not only immobilized her but inflicted relentless, intense agony. As Kexin suffered, Professor Lin, with a cold smirk, approached Xi Xi, who was still held by the other masked man. He held a thinner rope, the thickness of a little finger. "No... don't! Let me go!" Xi Xi sobbed, thrashing futilely. Professor Lin remained unmoved. He folded the rope, ensuring equal lengths, and placed the center loop behind Xi Xi's neck, tying a knot at the front. The rope descended along her midline, a second knot tied below her [X], and a third near her navel. I watched Xi Xi's body tremble with each tight knot, tears streaming down her face. As Professor Lin tied the fourth knot, Xi Xi and I understood his intent. This knot was deliberately made larger and positioned precisely over the most sensitive nub beneath her underwear, her [X]. "Yaaah!" The instant the rope tightened, Xi Xi felt a sharp, intense sensation surge through her body. She screamed uncontrollably, her body arching, a flush of shame spreading across her face. The rope then forced its way between Xi Xi's legs, digging deep into her perineum, pulled taut in her gluteal cleft, and knotted behind her. The ends were pulled outward, crossing the descending ropes at her abdomen, pulled taut, crossed again behind, then brought forward to loop through the abdominal ropes once more, pulled taut, and crossed behind again... This complex binding encased Xi Xi's torso, the ropes biting into her skin. Her breasts, particularly, were compressed by two sets of ropes, pushed into a fuller, more prominent shape, creating a strangely alluring, constrained silhouette. Throughout the binding, Xi Xi's [X] throbbed intensely, a mixture of fear and shame. I could see a dark, damp patch forming on the crotch of her tight jeans, a visible sign of her body's traitorous reaction to the pressure and stimulation of the rope against her [X]. "No... please..." Xi Xi shook her head, tears flowing, twisting her bound body in a futile attempt to escape. "Slap!" A sharp, resounding slap landed on Xi Xi's face, her head snapping to the side. A clear handprint bloomed on her pale cheek. Stunned, Xi Xi's cries and struggles ceased, replaced by soft, fearful sobs. Professor Lin watched her coldly. "That's better. Be quiet, cooperate, and you'll suffer less." His tone was that of a master chastising a disobedient pet. He then produced a folded, ordinary-looking white towel from his pocket. As he approached Xi Xi, she flinched back in terror, but the masked man held her fast. Professor Lin shoved the towel forcefully over Xi Xi's nose and mouth. Xi Xi's eyes widened in panic. She struggled for a moment, then her body went limp, her gaze unfocused. She slumped into the masked man's arms, unconscious. "Xi Xi!" I screamed in horror, trying to rush forward, but the masked man holding me was too strong. "What did you do to her?!" I roared at Professor Lin. Professor Lin slowly put away the towel, his gaze chilling. "Just a little something to quiet her down. Mei Ting, I advise you to cooperate. Otherwise..." He dangled the towel menacingly, then glanced at the camera, its red light blinking on a nearby table. "I won't hesitate to strip you all, take some photos, record some videos, and send them anonymously to the school administration, or... post them online. You know what the consequences would be, don't you?" My heart plummeted. Photos, videos, anonymous letters... these threats were like heavy chains. I looked at the unconscious Xi Xi, at Ya Xin sobbing on the cross, at Yu Han, naked and leashed like an animal, and at Kexin, bound and in agony. A profound sense of powerlessness and despair washed over me. We had fallen into a meticulously crafted trap, a dark and terrifying one, set by the professor we had trusted. Tears streamed down my face. I knew resistance would only bring worse consequences. Through my tears, I met Professor Lin's triumphant gaze and, with a heavy heart, nodded in submission. Professor Lin smiled, satisfied. The masked man holding me immediately began his work. He produced an identical rope and, just as he had with Xi Xi, started binding me. The rough rope chafed my skin as it tightened, pressing against my chest, cinching my waist. When the knot pressed against the most sensitive part of my inner thighs, an intense, involuntary shiver ran through me, nearly making me lose my balance. The rope passed between my legs, tightened behind me, and secured. My hands were forced behind my back, wrists bound tightly together with a knot. Soon, I was bound in the same manner. The ropes outlined my torso clearly, my hands secured behind me, leaving me utterly helpless. A deep sense of humiliation and complete subjugation overwhelmed me. Professor Lin approached me, the white towel in his hand. "No... please..." I begged, looking at the towel that meant oblivion. But Professor Lin's eyes were cold, devoid of pity. He reached out and pressed the towel over my mouth and nose. A pungent, sickly sweet odor filled my nostrils. I tried to hold my breath, struggling, but the masked man held me firmly from behind. After a few seconds, my lungs burned, forcing me to inhale... The sweet gas flooded my brain. My vision blurred. Professor Lin's face, contorted in a sinister smile, swam and distorted before my eyes... Darkness surged, consuming my consciousness. Before I lost all awareness, the last things I saw were Professor Lin's satisfied, cold eyes and the nightmarish scene around me: the bound Ya Xin, the leashed Yu Han, the unconscious Xi Xi, and Kexin, also bound, her fate unknown...

Her gaze swept frantically across the terrifying space. A rectangular hall, about fifty meters long and thirty meters wide, with no windows, completely cut off from the outside world. The walls on both sides were densely hung with various torture instruments and restraint devices—ropes of varying thickness, whips glinting with a cold light, icy handcuffs and shackles, heavy chains, and many other strange contraptions she couldn't name but instinctively found disturbing. Even more chilling were the dozens of large torture devices lined up on either side: electric shock devices with eerie indicator lights, tall wooden crosses, "wooden horses" with sharp protrusions, complex suspension equipment capable of contorting a person into various humiliating positions, and other perversions whose very appearance was enough to cause physical discomfort. Along the front and back walls stood a row of cold steel pipes, about ten centimeters in diameter, standing erect like silent sentinels. And most striking were the two parallel steel beam rails in the center of the ceiling, from which hung seven or eight trolleys. Chains and ropes dangled from the pulleys beneath the trolleys, like metallic tentacles awaiting their prey. In the very center of this nightmarish scene, she saw them—Xixi, Kexin, Yaxin, and Yuhan. Xixi was bound in an extremely shameful posture on an X-shaped wooden frame, her hands and feet spread and secured. A black leather restraint suit tightly encased her tender body, outlining the curves of her developing form. A red gag was stuffed into her mouth, saliva uncontrollably spilling from the corners of her lips and dripping down her chin. Tears streamed from her terrified eyes. Upon seeing Mengting, she let out a muffled whimper and shook her head desperately. Kexin, with her arms bound behind her back, was suspended beneath a pulley system, only her tiptoes barely touching the ground. She wore a deep red leather restraint suit, also bound in complex ways with rough hemp ropes, particularly around her chest, which was unnaturally elevated by the ropes. She seemed to have struggled; her hair was disheveled, and a red mark streaked her cheek. Though her eyes were filled with anger and defiance, her trembling body and the cold sweat on her forehead betrayed her pain and weakness. Seeing Professor Lin and Mengting, she immediately struggled, uttering muffled curses from her throat. Yaxin and Yuhan were in equally dire straits. Yaxin was forced to kneel beside a "wooden horse" torture device with a prominent protrusion, her hands bound behind her back. A collar was around her neck, connected to a chain held by a masked man. She was completely naked, save for a pair of white over-the-knee socks. Her snow-white skin was covered in whip marks and red indentations from restraints, her eyes vacant, as if she had lost focus. Yuhan was secured to a metal frame resembling a gynecological examination chair, her legs spread wide and locked, her upper body tightly bound by leather straps. The furry tail dildo still dangled behind her. She wore an eye mask, unable to see her surroundings, but her naked body trembled violently with fear, and the tiny bells on her nipples emitted faint but clear "ding-ling" sounds with her tremors. "Sister! Save me!" Xixi saw Mengting and clutched at her like a lifeline. Though her mouth was gagged, she let out a muffled cry with all her might. Kexin also stopped her futile struggles, staring intently at Professor Lin. Her voice, though muffled by the gag, was laced with clear hatred: "Lin, you beast! May you die a horrible death!" Professor Lin turned a deaf ear to their cries and curses. A look of almost fanatical excitement on his face, he scanned his "collection" before finally settling his gaze on Mengting. He yanked the chain forcefully, causing Mengting to stumble, and shoved her directly into the center of the hall, beneath a trolley. "Don't rush, we'll get to everyone, one by one," Professor Lin's voice dripped with sickening pleasure. "Today, we'll start with some basic 'cooperative training'." Mengting's heart rate suddenly accelerated. A sense of foreboding washed over her like icy water. She looked at the cold chains and ropes dangling from the trolley above, her fear so intense she could barely breathe. A masked man, wearing a black hood that revealed only his eyes and mouth, stepped forward, holding a remote control. He pressed a button, and a trolley emitted a low hum and slowly moved closer. Immediately, a stainless steel hook, connected to a chain and shaped like an anchor, descended from the trolley. The hook was about as thick as an adult man's thumb, glinting with cold metallic luster. Its tip was polished into a smooth arc, but even so, its sheer size and menacing shape were awe-inspiring. While Mengting was still stunned, the masked man had already approached her and crouched down. His rough fingers unceremoniously parted the intricately knotted rope between her legs, already slick with arousal, and found her most sensitive, core location. Then, he picked up the cold stainless steel hook and, with that smooth but thick tip, aimed directly at the area between her labia, where the rope knots were tightly pressing against her clitoris and vaginal opening. With a sudden thrust and hook! "Yaaaaaaah—!" An indescribable sensation exploded! It wasn't mere pain, nor pure pleasure, but an extremely rough, invasive, composite feeling of throbbing, friction, and intense pressure! The hook's icy temperature contrasted cruelly with the burning heat within her body. The hook's shape and size, combined with the constant, stable upward pull after hooking the rope knots, caused those rough knots, already deeply embedded in her flesh, to grind and scrape her most delicate and sensitive nerve endings with even greater pressure and focus! Mengting's body tensed like a drawn bow, then began to tremble uncontrollably. Her vision blurred, her mind went blank, all consciousness consumed by the devastating stimulation in her lower body. She moaned loudly, shamelessly, her voice high-pitched and distorted, tears streaming down her face like a broken dam. A more surging torrent of heat erupted from the depths of her core, instantly soaking the hook, the ropes, and the leather between her legs. "Feeling good, slut?" The masked man stood up, clapped his hands, his tone filled with contempt and mockery. "Already this wet at the start, what a natural-born whore!" Mengting was overcome with shame. She wanted to curl up, to escape this terrible torment, but the hook was firmly caught in her groin rope. Any slight movement would bring even more intense stimulation, and she had nowhere to run. Just then, another masked man pushed Xixi forward, who was equally terrified and crying almost to the point of exhaustion. Xixi looked at the menacing hook, her face drained of color, and desperately shook her head, backing away. "No! Don't! Sister! Save me! I don't want to!" But the man ignored her pleas, roughly holding her down. With the same technique, he forcefully hooked another hook, hanging from the same trolley, into Xixi's private parts, also tightly bound by ropes! "Waaah—!!!" Xixi let out a piercing scream that distorted her voice. Her body shot upwards, only to be restrained by the ropes and restraint suit, convulsing violently. Her tender body clearly couldn't withstand such intense stimulation. Her eyes instantly glazed over, leaving only instinctive, painful twitches and whimpers. Thus, Mengting and Xixi, sisters, were connected by the linked hooks hanging from the trolley, forming an extremely humiliating "H" shape. They were less than an arm's length apart, able to clearly see the expressions of pain, shame, and breakdown on each other's faces, and feel the violent tremors of each other's bodies due to the continuous stimulation. This was not the end. The first masked man took out two thin chains, each ending in a cold metal nipple clamp with tiny serrations. He walked up to Mengting, grabbed one of her breasts, which was unnaturally erect and engorged due to the pressure of the leather and ropes, and without any gentleness, clamped the nipple clamp onto it with a "click"! "Ah!" The sharp sting made Mengting scream. The man repeated the process, clamping the other clamp onto her other nipple. The same sharp pain shot through her, and Mengting was in so much pain she nearly fainted. Then, holding the other end of the chains, the man walked to Xixi. Xixi looked at the chains with the terrifying clamps, crying, "No! Please! Don't clamp there! It hurts so much!" The man ignored her, roughly pulling open the edge of her restraint suit, revealing her small, developing breasts. Then, he forcefully clamped the two cold clamps onto her tender, small nipples! "Ahhh—! It hurts! Mommy! Save me!" Xixi let out a heart-wrenching scream. Her body curled up in pain, but she was pulled by the hook and couldn't move. Subsequently, the man connected the two chains linking Mengting's and Xixi's nipple clamps in the middle with a "click"! Now, not only were the sisters' lower bodies linked by hooks, but their chests were also tightly connected by this chain. Any movement by one would, through this chain, pull on the other's equally sensitive and vulnerable nipples! "No... don't do this..." Mengting looked at her sister's pained, contorted little face, her heart breaking, tears blurring her vision. However, the torment had only just begun. The masked man controlling the trolley pressed the remote again. "Hummm—" The trolley started again, and the chains connecting the linked hooks and the women's nipples began to slowly ascend!