Forced insertion into the bound sister

On June 9th of this year, I finally had sex with my sexy older sister, and from then on, we became a perfect sexual couple. Whenever I had the chance, I would pester her to have sex with me. Although she still had some fears about incest, she eventually chose my large penis over her morality. After a while, she even came to my bedroom on her own initiative, taking off her clothes one by one, and having passionate sex with me. Seeing my sister gradually open up, I was overjoyed, but a secret desire still lingered in my heart: to play SM with my sister. As the days went by, my lewd thoughts grew stronger and stronger. I even fantasized all day about binding my naked sister with ropes, then frantically dripping wax on her snow-white body and whipping her, watching her round and perky buttocks covered with bloody welts. Whenever I did this, I would hear my sister's lewd moans, my penis would instantly become erect, and my semen would gush out. To fulfill my desire, I secretly purchased ropes, low-temperature candles, a vibrating egg, a black SM costume, anal plugs, a blindfold, handcuffs, and other props, eagerly awaiting a wild moment. However, I had reservations because my sister found this form of sexual sadism unacceptable. It was a real drawback for me. Whenever I clicked on SM images on the computer, watching those abused women being whipped, dripped with wax, having steel needles inserted into their nipples; or having their penises stomped on with high heels, or having urine sprayed into their mouths, my sister always said it was disgusting and demanded I turn it off immediately. I repeatedly told her that SM is actually a sophisticated form of sex, achieving orgasm through sadomasochism, which can greatly satisfy possessiveness and a sense of power, but she always thought this practice, which harms the body, was too horrifying. However, the more my sister resisted, the stronger my desire became; I wished I could immediately make my sister my sex slave. In the agonizing wait, the calendar turned to October 1st, National Day. That evening, my parents went out to play cards with friends, and my older sister dressed up specially for a get-together with her colleagues. Although it was just a casual gathering, her outfit was still exceptionally provocative: a tank top with a beige jacket, her breasts proudly erect between the buttons, revealing a deep cleavage, and the lace trim of a strapless black bra faintly visible through the tank top. She wore a very short skirt, her legs encased in flesh-colored stockings, and seven-centimeter black high heels. Her stockings gleamed alluringly, and as she half-squatted, a corner of her black panties peeked out, revealing her vulva. I imagined that part of her panties was already soaked with arousal fluid, and I couldn't help but feel a surge of resentment: "Is my sister going to a sex party? How can she bear to leave me alone at home?" I was burning with jealousy. I moved closer to my sister, stroking her buttocks with both hands, and said, "Sister, don't leave me behind. It's been four or five days since we last made love. Stay home with me tonight. My little brother's been holding back for so long; he'll definitely satisfy you." My sister twisted her hips, swaying a few times, and said in a seductive voice, "Stop it, the party's already booked. One of those men has a huge penis; I'm going to enjoy that… How about this, we'll play together when I get back." I said urgently, "By the time you get back, Mom and Dad will already be home. What chance will I have? Sister, don't be so heartless! I want to make love to you now." As he spoke, he slipped his arm under his sister's skirt, caressing her labia through her black panties. "How about this, let's do it with your brother first, then we can go out." At the same time, he boldly hugged his sister from behind, his other hand slipping inside her tank top, kneading her left nipple. His sister said repeatedly, "Stop it, stop it, I'm in a hurry! You little pervert, you play with your sister every day, aren't you tired of it?" He grinned lewdly and said, "Sister, I've been with a few women lately, but none of them compare to the sexy you. You're so hot, how could I ever get tired of you? By the way, I've learned a few new tricks, let's try them out in bed." As he spoke, he inserted his fingers into his sister's vagina, slowly stirring them. She let out a soft moan, her body beginning to heat up. He immediately withdrew his fingers from her vagina and began to tease her clitoris, while simultaneously licking behind her ear and gently biting her earlobe. Under my seduction, my sister gradually became aroused, breathing softly and intermittently. Finally, she sighed and said, "Okay, okay, I'll do as you say, but only once. I'm going to the party." I said with a lewd grin, "Sister is so unrestrained, even after being penetrated by her brother, she still wants to go find another man." But secretly, I was delighted: "Once you're hooked, I won't let you go. I'll play with you for the whole night." My sister was half-heartedly helped into my bedroom, where everything was ready! She suddenly pushed me away, kicked off her high heels, and started taking off her clothes. Soon, my sister, wearing only a black bikini, was in front of me. Just as she was about to take off her stockings, I gestured to stop her. My sister giggled and said, "What's wrong? Are you going to help me take off my panties?" She turned around and twisted her lower body, pulling down her black panties to reveal half of her snow-white buttocks. Seeing that the time was right, I smiled and said, "Sister, I bought you something nice. Take a look." With that, I pulled a black lingerie piece from under my pillow, spread it out, and proudly showed it to her. My sister was startled, then nodded and said, "Good little brother, you really know what's on my mind. I've been wanting a lingerie piece, hmm, I'll put it on for you to see." She unhooked her bra, pulled down her panties, and took the lingerie completely naked. She slipped it on between her legs, adjusted the straps, and changed its position. It was a stretchy, open-crotch, mesh bra that clung tightly to my sister's voluptuous body, revealing her two large, peach-like breasts and her hairless mons pubis. I admired her, swallowed hard, and said, "Sister, put on your high heels. You'll be even sexier, irresistibly alluring." She did as I said, putting on her shoes and striking a few poses in front of me. She even turned and bent over, clearly seeing her vaginal opening slightly open. She murmured, "What are you waiting for? Just fuck me like this!" I approached, carried her to the large bed, took off her lingerie, spread her legs, and thrust my hard penis into her vagina, pounding hard. She moaned, her hands groping my body. My penis was tightly enveloped; due to the ample foreplay, her vagina quickly contracted, as if trying to suck out my semen. I shook my head to clear my mind, knowing that tonight wouldn't just be about making love with her. So I withdrew from the penis, grabbed her hands and pinned them against the bed frame, then lowered my head to kiss and suckle her nipples. She said coquettishly, "Why didn't you put it in? You pulled out halfway? Hurry up and make me feel good! Oh, oh, oh, mmm, mmm, little brother, you're licking me so well!" In her dazed state, she suddenly heard two crisp "clicks, clicks," and her wrists, already bound by iron handcuffs, were suspended from the iron frame. She asked, "Little devil, what are you doing?" I didn't answer, but turned and locked her ankles, shaking the penis and lewdly grinning, "Sister, you can't escape now, you can only obediently let your little brother play with you." She was both angry and amused, saying, "You little pervert, let go of me. Otherwise, you won't let me penetrate your cunt." I pursed my lips, then suddenly emphasized, "From now on, you're not my sister, but my sex slave. You must obey your master, or your master will punish you." Her pretty face flushed red, as if she sensed something, but she couldn't say a word. I eagerly pulled out the rope and began binding the beautiful sex slave on the bed, who was only wearing stockings and high heels. I loosened the handcuffs, grabbed my sister's hands tightly to immobilize her, and then bound her delicate feet, tying several tight knots behind her back. Then I wrapped the rope around my sister's body, finally binding her feet, her feet clad in stockings and high heels. I admit I have a foot fetish. When I removed her high heels, I saw my sister's two delicate feet, pink and lovely, with a few dark veins faintly visible on her snow-white skin. Her ten toes were shyly curled, painted with red nail polish, looking incredibly sexy and alluring in the flesh-colored stockings. I couldn't resist, grabbing my sister's feet and licking them, gently biting her toes with my teeth, and licking from her heels to her toes with my tongue, enjoying the mixed flavors of the stockings and her fleshy scent. Gradually, my sister's breathing became heavy, and her cooled desire slowly rose again. She mumbled, "It's so itchy, so wet, sister's feet feel so good, sister's going to leak!" Hearing this, I was even more overjoyed. I put my head between my sister's legs and saw a stream of love fluid slowly flowing out, dripping into my mouth, smelling of urine and a seductive scent. I mumbled, "Sister, you can still accept sadomasochism, you have the potential to be a slave. If you're not satisfied, you can be the master and torture me!" Of course, I hadn't tasted enough of the pleasure of sadomasochism, how could I stop there? My sister was now firmly bound, unable to escape my grasp. I turned her over so that she was facing the sheets. My sister's body was bent in pain, but her soft moans never stopped. Her breasts trembled with her breath, and her dark red nipples, pressed against the rope, were already erect. Excitedly, I pulled out the soft whip and gently rubbed it against my sister's buttocks, saying, "Sex slave sister, I'll make you scream with pleasure!" Before I finished speaking, the whip lashed across her smooth buttocks. Although the force wasn't too strong, my sister cried out, "Ah! Why are you hitting me?""It hurts so much!" I showed no mercy, lashing her buttocks with each lash. The cracking sounds were incessant, and my sister cried out in pain. Several bright red welts appeared on her tender skin, like a piece of jade adorned with a touch of rouge. I whipped her again, slapping her with my palms. My sister's buttocks spread open, her anus tightened, and her labia minora squeezed against her labia majora, revealing a fleshy slit. I kneaded her labia minora with my hands, pushing them up and down. Soon my fingers were covered in her love juice, which I then put in my mouth and sucked, while continuing to whip my dear sister. After dozens more lashes, my sister began to sob softly, her cries interspersed with suffocating moans, which sounded like desire gradually rising within her. I said fiercely, "Slave, there are still many more props waiting for you! Do you want them?" My sister burst into tears, her nose stinging, and said, "I don't want them, I don't want them! You can forget about ever penetrating me again!" I knew I had to completely conquer her! I stopped and laid out the props one by one in front of my sister. First, I put nipple clamps on her. Two small nipple clamps covered in soft rubber bit into my sister's nipples. After turning on the power, the vibrating egg under the nipple clamps started working, massaging my sister's sensitive areas. Next, I inserted a 125mm red anal plug coated with lubricant into my sister's anus, and even rotated it a few times. Under the stimulation of the vibrating egg at its strongest setting, my sister's nipples were unbearably itchy and numb, and her anus was instantly filled. Pain and pleasure surged to her head, and she couldn't help but cry out. I carefully observed my sister's wanton and painful appearance. Streams of love fluid flowed onto the bed, and drops of sweat soaked the pillowcase. When her labia majora were fully engorged and her opening widened, I turned on the vibrator and inserted it into my sister's vagina. Stimulated by these three BDSM instruments, my sister reached orgasm even faster, rolling around on the bed, moaning loudly, her tightly bound limbs curled up like a kitten in heat. Seeing this, I could no longer restrain myself. I pulled out the vibrator, loosened my sister's legs, and thrust my penis forcefully into her vagina, pumping hard while groping her stockinged legs. My sister was already driven mad by the stimulation. Although her arms were bound behind her back, she still sat up, allowing the anal plug to be inserted more thoroughly, her breasts trembling, begging me for even more intense humiliation. "I'm so happy, little brother, I'm having the time of my life! I didn't know SM had such benefits. My breasts are about to burst, but little brother, don't take this clamp off!... Give me some more stimulation... give me some more stimulation!" I was overjoyed. I grabbed the lighter, lit a low-temperature candle, and let the wax drip all over my sister's large breasts. My sister almost rolled her eyes back, moaning, "Oh... so good... dripping wax, hot and spicy, I love it!" Red wax flowed down my sister's breasts, down to her waist, and splashed onto her mons pubis. Her long hair was disheveled and covered in sweat, but her face was full of longing. As I admired the stunning female slave beneath me, I increased the frequency of my thrusts. My sister's moans grew louder and louder: "Fuck me, fuck me hard! Torture me, torture me hard... Master, play me to death!" I was overjoyed. I made my sister lie face down and dripped wax onto the wounds on her buttocks to increase her pain and pleasure. Meanwhile, my penis was still stroking her vagina, the glans swollen to its maximum, completely stretching the vaginal walls. Waves of pleasure, and the satisfaction of humiliating my sister, drove me almost mad. I whipped her back, tore at her hair, and she was like a mare, ridden at my will, not daring to utter a single complaint. After hundreds of thrusts, my glans was itching unbearably, so I immediately pulled out my penis and saw my sister ejaculating vaginal fluid for the nth time. I hurriedly stuffed my penis into my sister's cherry-like mouth, thrusting my hips, and a large gush of white semen shot deep into her throat. My sister let out a soft moan, followed by the sound of her swallowing the semen, as if savoring a unique delicacy. I grabbed the base of my penis with one hand and masturbated incessantly, wanting to ejaculate the last bit of semen into my sister's mouth. After it was all over, my sister licked the remaining semen off my penis, knelt before me, her eyes filled with despair and pleading. Two streams of white semen spilled from the corners of her mouth, dripping onto her breasts, which were already red from being bound. In the time that followed, I continued my dominant, sadomasochistic relationship with her, ejaculating five times. Twice, I even used a plate to collect my semen, making her lick it like a bitch. At this moment, my sister was so submissive, having completely forgotten about the sex party she was supposed to attend; I knew then that my sister was now my sex slave!

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Forced insertion into the bound sister

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