Forced insertion into the bound sister

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On June 9th, 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 go to bed with me. Although she still harbored some fear of 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 we had passionate sex. Seeing my sister gradually open up, I was overjoyed, but a secret desire still lingered in my heart: to play SM with my sister.

日子慢慢过去，我淫邪的念头越来越盛，甚至整天臆想着用绳子一道道捆绑住全祼的姐姐，再疯狂地往她雪白的肉体上滴蜡、鞭打，看着她浑圆挺翘的屁部上布满血红的伤痕。每当这个时候，我的耳边就响起了姐姐淫蕩的叫床声，鸡巴瞬间耸立，精液喷薄欲出。

为了实现愿望，我偷偷购置了绳索、低温蜡烛、电动跳蛋、黑色的ｓｍ游戏服、肛门塞、眼罩、手铐等道具，一心等着某个狂放的时刻。

然而，我有所疑虑，因为姐姐难以接受这样的性虐方式。以我长时间观察看来，姐姐在性方面虽然放蕩，但一直只接受正常的性爱，甚至连口交都排斥，真有些美中不足。

每当我在电脑上点开ｓｍ的图片，看着那些被虐待的女人接受鞭挞，滴上蜡水，被钢针刺入乳头；或者用高跟鞋踩踏阴茎，将尿水喷射到嘴里，姐姐总是说太噁心了，要求我马上关掉。

我多次向她提及，ｓｍ事实上是一种高级的性爱方式，在虐恋中达到性的高潮，能极大地满足佔有慾和权力感，但她总是认为这种有损身体的做法太骇人听闻。不过，姐姐越是这样推脱，我的慾望就越是强烈，恨不得立刻让姐姐变成我的性奴隶。

在难熬的等待中，日曆翻到了十月一日，国庆日。这天傍晚，父母都出去与朋友打牌了，姐姐也特别打扮了一番，準备出门和同事共聚。

虽然是普通聚会，姐姐的着装仍然异常惹火，吊带背心配一件米黄色外衣，排扣间的双峰傲然挺立，露出深深的乳沟，隐约可见吊带背心中无肩带黑色文胸的蕾丝花边。下身超短裙，两条玉腿裹在肉色丝袜中，脚蹬一双七釐米高的黑色高跟鞋。

她的丝袜泛出诱惑的光泽，半蹲下身时，黑色的内裤就露出一角，那正是蜜穴的位置，我想那部分内裤早已被爱液打湿了吧，不由得暗怨：「姐姐这是去参加性派对吧，她真忍心把我一个人抛在家中。」我妒火中烧，挨近姐姐身边，双掌抚摩着她的屁股，说道：「姐姐，别把我丢下嘛。算算我们已经有四五天没做爱了，今天晚上就在家陪我吧。弟弟的鸡鸡憋了这幺久，一定会让你满足的。」姐姐扭动腰肢，摇摆了几下，腻声说道：「快别闹了，今天的派对早都定下了。那些男人中有个ｊｂ巨大的，姐姐正好要享受一下……这样吧，等姐姐回来再和你玩。」我急道：「等你回来爸妈已经在家了，我还有什幺机会啊。姐姐，你不要这幺狠心嘛，弟弟现在就要和你做爱。」说着就将手臂伸进姐姐的短裙，隔着黑色内裤抚弄着姐姐的阴唇，「要不这样吧，先和弟弟做，再出门不迟啊。」同时更大胆地从身后抱住姐姐，另一只手插进吊带背心，揉捏着她的左乳头。

姐姐连声说：「别闹，别闹，我赶时间呢！你这个小色鬼，天天玩姐姐，还玩不腻吗？」我淫笑着说：「姐姐，弟弟这段时间也上过几个女人，但是那滋味怎幺也比不上性感的你呢。姐姐你太惹火了，我怎幺会玩腻呢？对了，弟弟学了几手新花样，我们这就上床试试吧。」说话间手指插入了姐姐的阴道，慢慢搅动起来，她娇哼一声，身体开始发热。

我的手指立刻从阴道中退出，开始挑逗阴蒂，同时舌头舔着她的耳后，轻轻咬着耳垂。

在我的引诱下，姐姐渐渐来了感觉，断续地低声喘气，终于叹息着说：「好好，姐姐依你，不过只玩一次哦。我还要去ｐａｒｔｙ呢。」我涎着脸说道：「姐姐好奔放，被弟弟插了还要去找男人。」心中却暗自窃喜：「等你上了钩，我可不会放你走，怎幺说也要玩一个晚上。」姐姐半推半就地被扶进了我的卧室，在那里一切都準备就绪了！她猛地推开我，踢掉高跟鞋，开始脱衣服，很快只穿着黑色三点式的姐姐就呈现在我眼前。

她正要脱掉丝袜，我打手势阻止了，姐姐娇笑道：「怎幺了，你要帮我脱内裤吗？」她转过身扭动着下身，将黑色的小内裤拉开，露出半个雪白的臀部。

我见时机成熟，便笑着说：「姐姐，我为你买了件好东西。你看看罢。」说着便从枕头下拉出一件黑色的情趣内衣，双手展开，喜滋滋地向她展示。

姐姐一怔，点头说：「乖弟弟，真知道姐的心事。我正想要一件情趣内衣，嗯，姐姐穿上让你看。」她解开乳罩的扣子，褪下内裤，全祼着接过内衣，从双腿间套上，将肩带挂好，调整了位置。这是件弹力网式露乳开裆内衣，紧紧绷在姐姐丰满的身体上，两个水蜜桃般的大奶子和没有一根毛的阴阜都露了出来。

我欣赏着，嚥下一口唾沫，说：「姐姐，你穿上高跟鞋吧，这样会更性感，迷死人不偿命。」姐姐依言穿鞋，在我面前摆了几个姿势，更转身弯腰，可以清楚地看到阴道口微微张开，她幽幽地说：「还等什幺，就这样插我吧！」我走近，将姐姐抱到宽大的床上，脱掉情趣内衣，分开两腿，将硬挺的ｊｂ插入她的阴道，狠狠地顶了起来，姐姐也随之浪叫，双手在我身上乱摸。

我的ｊｂ被紧紧裹住，由于前戏充分，姐姐的阴道很快就收缩起来，似要将我的精液就此吸出。我晃一晃脑袋，令自己清醒，知道今晚绝不仅仅和姐姐这样做爱。于是退出ｊｂ，抓住她的双手压在床栏上，低头亲吮姐姐的乳头姐姐娇嗔道：「怎幺不插进去啊？弄了一半就退出了？快点把姐姐乾爽！哦哦哦，嗯嗯嗯嗯，弟弟把我舔得好爽！」在迷乱间，她忽然听到「卡嗒、卡嗒」两声脆响，手腕早被铁铐困住，悬在铁架上。姐姐问道：「小鬼头，你这是做什幺？」我并不回答，扭头再将她的脚腕锁住，晃动着ｊｂ淫笑着：「姐姐，你这下跑不掉了，只有乖乖地被弟弟玩弄。」姐姐又好气又好笑，说道：「你个小色狼，快放开姐姐。要不然姐姐的骚屄不让你捅了。」我撇撇嘴，忽然加强口吻说：「从现在起，你不是我姐姐，而是我性奴了。必须听主人的话，否则主人要惩罚你哦。」姐姐俏脸飞红，似乎预感到了什幺，但一句话也说不出来。

我迫不及待地摸出了绳索，开始捆绑床上这个只穿着丝袜和高跟鞋的美丽性奴。我放鬆铁铐，一手紧抓住姐姐的双手，令她无法动弹，接着捆住这双玉葱，反绑着狠狠打了几个死结。之后将绳索一圈圈环绕在姐姐的胴体上，最终捆住了她的双脚，穿着丝袜与高跟鞋的双脚。

我承认自己是个恋足癖，当我脱下她的高跟鞋，只见姐姐的两只玉足粉嫩可爱，雪白肌肤上隐隐透出几根暗色的静脉，十个脚趾羞涩地弯曲着，涂了红色的趾甲油，在肉色的丝袜里显得非常性感，非常诱惑。

我无法自抑，抓起姐姐的双脚舔了起来，牙齿轻咬她的脚趾，更用舌头从脚跟舔到趾尖，享受着丝袜的肉香的混合味道。

渐渐地，姐姐呼吸变得粗重，冷却的情慾慢慢高涨了起来，迷迷糊糊地说：「好痒，好湿，姐姐的脚好舒服，姐姐要流水水了！」我一听更加喜不自禁，伸头在姐姐的胯间，果见一股爱液慢慢流出，滴在我的嘴里，散发着尿味和风骚的气息。我含糊地说道：「姐姐，你还是能接受虐恋嘛，有当奴的潜质啊。要是玩得不过瘾，你来当主人，来虐待我吧！」当然，我还没有尝够施虐的滋味，怎能就此罢休？

My sister is now firmly bound, unable to escape my grasp. I flipped her over so she faced the sheets. Her body was contorted in pain, but her soft moans never ceased. Her breasts trembled with each breath, her dark red nipples already erect from the pressure of the ropes.

Excitedly, I pulled out the soft whip and gently rubbed it against her buttocks, saying, "Sex slave sister, I'll make you scream with pleasure!" Before I finished speaking, a whip lashed across her smooth buttocks. Although the force was neither too light nor too heavy, my sister cried out, "Ah, why are you hitting me? It hurts so much!" I showed no mercy, lashing her buttocks again and again. The cracking sounds were incessant, and my sister cried out in pain. Several bloody welts appeared on her tender skin, like a jade pendant adorned with a touch of rouge.

I whipped her again, slapping her with my palms. My sister's buttocks spread wide, her anus tightened, her labia minora pressed against her labia majora, revealing a fleshy slit. I kneaded her labia minora, pushing them up and down, my fingers quickly becoming covered in her love juice. I put my fingers in my mouth and sucked on them while continuing to whip my dear sister.

After dozens more blows, my sister began to sob, her cries interspersed with suffocating moans, which sounded like her desire gradually rising.

I said viciously, "Slave, there are many more tools waiting for you! Do you want them?" My sister cried, 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 placed the tools in front of my sister one by one. 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 eggs 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, even rotating it a few times. Stimulated by the vibrator at its strongest setting, my sister's nipples tingled and itched unbearably, while her anus was instantly filled, causing a surge of pain and pleasure that made her cry out.

I carefully observed my sister's wanton yet painful state; streams of vaginal 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 again and inserted it into her 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 with my hands.

My sister was already driven mad by the stimulation. Although her arms were tied behind her back, she still sat up, allowing the anal plug to be inserted more thoroughly. Her breasts trembled, begging me for even more intense humiliation.

"I'm so happy, little brother, I'm so happy. 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!" The 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 stunningly beautiful female slave beneath me, I increased the frequency of my thrusts. My sister's moans grew louder: "Fuck me, fuck me hard! Torture me, torture me hard… Master, play me to death!" I was overjoyed. I made her lie face down and dripped wax onto the wounds on her buttocks, intensifying her pain and pleasure. Meanwhile, my penis continued to move inside her vagina, the glans swollen to its maximum, completely stretching the vaginal walls. Waves

of pleasure and the satisfaction derived from humiliating my sister drove me almost mad. I lashed her back with the whip, tearing at her hair. My sister was like a mare, ridden at my will, daring not to utter a single complaint.

After hundreds of thrusts, my glans became unbearably itchy. I immediately pulled out my penis and saw my sister ejaculating for the nth time.

I hurriedly shoved my penis into her cherry-like mouth, thrusting my hips forward, 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 semen, as if savoring a unique delicacy.

I gripped the base of my penis and masturbated relentlessly, wanting to ejaculate the last drop of semen into her mouth.

When it was all over, she licked the remaining semen from my penis, knelt before me, her eyes filled with despair and pleading, two streams of white semen spilling from the corners of her mouth, dripping onto her already reddened, bound breasts.

In the following moments, I continued my dominant, sadomasochistic lovemaking with her, ejaculating five times. Twice, I even used a plate to collect my semen, forcing her to lick it like a bitch. At this point, she was so submissive, having completely forgotten about the sex party she was supposed to attend; I knew then that she was my sex slave!

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Forced insertion into the bound sister

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