Sisters are one family

That evening, my sister took a shower and went to her room first. My wife nudged me with her lips. I turned to look at my brother-in-law; he sat expressionless on the living room sofa, deliberately staring at the floor, avoiding my gaze. Heh heh, what a blatant attempt to hide his true feelings. I tiptoed into the bedroom. Only a small lamp was on. My sister was wrapped in a sheet, her eyes closed, her cheeks flushed.
I closed the door and gently pulled back the sheet. Sure enough, she wasn't wearing anything. First, I saw her snow-white shoulders, then her full breasts, small nipples, a firm abdomen, messy pubic hair, and finally her rounded thighs, long calves, and chubby feet. My eyes swept over her entire body.
My sister's body was completely exposed before me. Her fair skin was like a sacrificial lamb, lying defenseless before the god of conception. I felt my blood boiling, wanting nothing more than to devour her whole.
Her face flushed even more, her breathing quickened, and her breasts heaved rapidly, her nipples bobbing up and down like two small boats on a turbulent sea.
I cupped the breast I had longed for in one hand, and she let out a soft "hmm," her body tensing instantly, her hand instinctively rising to grasp my wrist. I felt her stiffness; after all, she wasn't the kind of woman with an open mind. If it weren't for the child, she probably would never have touched another man in her life. Now, lying naked before another man, letting him play with her breasts, it was inevitable that she would be tense.
I suppressed my burning desire, feigning gentleness as I lay down on my side, tenderly stroking her cheek and gently kneading her breasts. Her breasts were fuller than my wife's; even lying down, they remained firm and large. Because she had never breastfed, her breasts were very firm and elastic to the touch—frankly, much better than my wife's. I gently circled her breasts, from left to right, then back to left. Slowly, her expression became more natural; I knew she was relaxing, preparing for my penetration and insemination.
One hand continued kneading her breast, while the other began to move downwards, first along the outside of her body, then slowly gliding over her waist, buttocks, and thighs. After a while, I parted her legs. This time, she didn't resist, slightly opening her legs. My heart pounded. Oh, she was ready to accept me! I reached into her opening but found no moisture, so I withdrew my hand and carefully stroked her inner thighs. Her thighs were soft and felt wonderful.
She began to show a slightly comfortable expression. I freed my hand to pull down her shorts and guided her hand to my penis. It was burning hot. She immediately understood what she had touched, her closed eyes flickered, and she closed her hands to grasp it, occasionally squeezing it gently. I embraced her body and began to suckle her nipples.
Her nipples quickly hardened, and I inhaled her fragrance with ecstasy, kissing my way up her chest, neck, chin, nose, and eyes, but I didn't dare kiss her lips.
My sister's reaction intensified, and she began to moan indistinctly. Everything went smoothly, and I continued sucking on her nipples, then rolled over and pressed myself against her warm body, my hard penis pressing against her soft lower abdomen, my legs calmly rubbing against her thighs. I checked the entrance again; it was wet and smooth. I groped and parted her labia, inserting my fingers. My sister's body was invaded, her buttocks tightened, and she let out a soft "hmm," gripping my arm tightly. I felt a surge of ecstasy: I was already overflowing!
I immediately pulled a pillow over and placed it under her buttocks, both for easier sex and to prevent semen from leaking out. My sister opened her eyes, understood what I meant, and her chest heaved violently. I could clearly feel her legs trembling. She obediently lifted her buttocks, allowing me to place a pillow under her. I knelt between her legs, lifted her feet, kissed her labia a few times, spread her labia with one hand to expose her opening, and grasped my penis with the other, ready to insert it.
Just then, my sister let out a groan and grabbed my wrist. I was startled and asked, "What's wrong?" My sister said haltingly, "No... I feel... not yet..." She's already so wet and still not ready? I pulled her hands away and said, "Okay, okay, don't be afraid, you've been ready for a while." I aimed my penis at her and thrust it in, but just as the head of my penis entered, she quickly pulled her legs back, rolled over to her right side, and tightly protected the entrance with her hands, muttering incoherently, "No...no...not yet..." At this crucial moment, I couldn't let her cause any more trouble. I lay down against her back, lifted her thigh with one hand, aimed my penis at the entrance, and thrust it in hard again. My sister let out another "Ah!" and rolled to the other side of the bed, this time screaming much louder. As soon as the door opened, my wife and brother-in-law rushed in. It was strange, but at this moment, my sister actually quickly pulled the sheet over her body. Was she embarrassed even by her husband and sister? This made me reflexively cover my penis as well.
They came so fast, I really suspect they'd been squatting outside the door all along. My wife immediately asked, "What's wrong?" My sister seemed unable to say anything else, only repeating over and over, "No... I can't..." My wife was annoyed. She said, "Look at you, you're the one who wants to have sex, and you're the one who can't. You went in last time, why can't you this time? If you don't do it this time, then you've... wasted your time, haven't you? Your husband and I have sacrificed ourselves for nothing, haven't we? Huh?" My sister clutched the sheets tightly, unable to say a word, pitiful. Looking at her with a pleading expression, my wife's heart softened again. She sat on the edge of the bed, stroking my sister's hair, and said, "Alright, little sister, now that things have come to this, we have no choice but to continue. Don't think too much about it." She beckoned me to sit down too, and holding my penis, she said to my sister, "Look, it's just letting this thing go in for a bit, just going in and fiddling around a few times. Here, feel it." After all that fuss, my penis had already gone soft, but when my wife pulled my sister's hand over and held it, it immediately became excited again, throbbing and hardening in her chubby little hand.
My sister stared intently at it, her outstretched arm revealing half of her breast, casting a spherical shadow in the dim light. My penis grew even faster, the glans breaking free of her hand, gleaming purple as it thrust towards her face, seemingly too big for one hand to hold.
Finally, my penis became incredibly hard, even pointing upwards—a difficult feat. I could only get this hard when I was a teenager, not even during my first time having sex with my wife. I never imagined that my sister-in-law's stimulation would cause my penis to perform so exceptionally well. Perhaps it was because I was being intimate with her sister in front of my wife that it felt so stimulating.
I couldn't resist grabbing my sister's hand and gently stroking my penis. My wife continued her earnest admonition: "Didn't you say yourself that you should just treat it like a scalpel? It's just two cuts, two cuts and it's done, it doesn't even hurt." My sister, who had been obediently playing with my penis, suddenly pulled her hand away and said, "No, sister, that's what I thought too, just treat it like a scalpel. But who knows? Thinking is one thing, and physical reaction is another. When it wants to... go in, I just can't control myself, I just can't let it in." My wife hadn't expected this reason and said dismissively, "Sigh, you should try to be more open-minded. Just treat it like your husband. Men's things are just like that, aren't they?" I chuckled and said, "You talk like you've seen that kind of thing." My sister laughed too. They actually came from a very strict family. Although my wife and I had premarital sex, we had already decided to get married at that time, and she was still a virgin. My sister knew this about her sister very well. My wife glared at me for a moment, then suddenly turned to my brother-in-law, yanked his shorts down with both hands, grabbed his penis, and dragged him to the light, saying, "Look, look, look closely, is there anything different?" The three of us were stunned; we never expected her to do something like this. My brother-in-law had been standing silently by, watching my wife urge his sister on. Suddenly having his shorts pulled down and his penis grabbed, he was completely flustered, awkwardly stammering "Ahhh," unable to speak.
My wife was just over thirty; although not as voluptuous as my sister, she was tall and slender, with a straight nose and large eyes, often captivating many at university dances.
Putting myself in her shoes, since I have sexual fantasies about my sister-in-law, my brother-in-law probably has similar feelings for her. Today, since we're visiting my sister's house, my wife is dressed casually—a pink low-cut t-shirt and a white skirt. When she pulled my brother-in-law up, he was standing right in front of her. Looking down, I could see at least half of her breasts, and his calves were already brushing against her most sensual parts: those two strong, long legs. My brother-in-law blushed, his breathing quickened, and his penis hardened at a rate no less than mine.
At this moment, both penises stood side-by-side under the light. We were about the same size, and our penises were similar, but because my brother-in-law was a bit heavier, his penis looked smaller against his belly, and part of the base was already buried in his stomach—meaning he probably couldn't penetrate as deeply as I could.
On the other hand, because I'd been circumcised, the transition between my glans and penis didn't look as natural as his.
My sister glanced at it twice, then stammered, "Um... nothing's different..." My wife realized her rashness and, upon receiving her sister's answer, quickly let go, blushing, and said,
"Well, then, let's continue..." Continue? How could they continue? I was inwardly wryly smiling when, unexpectedly, my brother-in-law, after the earlier stimulation, couldn't hold back any longer and immediately interjected, "How about I go in first, brother-in-law, you can come in later. Don't worry, I definitely won't ejaculate." Then he quickly grabbed the hard stick, went around to the other end of the bed, lifted the sheet, lifted my sister's legs, aimed slightly, and smoothly inserted it.
My sister's expression shifted slightly, seemingly quite comfortable. My wife and I knew the insertion was working well. My brother-in-law seemed to have been too stimulated earlier, panting heavily as he thrust forcefully.
A slight smile appeared on my sister's face. Seeing us watching her, she closed her eyes shyly, but still hummed softly in rhythm with her brother-in-law.
Seizing the opportunity, I quickly lifted the sheet and gently massaged my sister's breasts. She lightly grasped my wrist but didn't resist; instead, she guided my hand to massage her own breasts. Her smile widened. If my wife hadn't been there, I would have loved to kiss her.
Just then, I felt a movement below. Looking down, I saw my wife's hand cupping my penis. Her eyes were fixed on my sister and brother-in-law's genitals, one hand supporting her flushed face, the other gently stroking my penis.
My brother-in-law, noticing his wife watching, thrust even harder, looking up at her with a smug grin. My brother-in-law's smile was so obvious, even I could tell. He was practically saying, "How about that?
" His wife, unsure what to do, turned to look at the head of the bed, only to see me intently caressing her sister's breasts. She couldn't help but say sourly, "You two are having a good time—okay, be careful not to ejaculate, time to get down to business." Hearing this, my brother-in-law pulled out with a "hey," tumbling to the edge of the bed, saying, "Okay, brother-in-law, hurry up, or I'll really ejaculate again." My sister, already flushed from his ministrations, felt a sudden emptiness below, opened her eyes, and gave me a hopeful look before quickly turning her head away and closing them again.
That look fueled my passion. I raised my penis, strutted onto the bed, and, as if wielding a well-forged iron rod, slammed it down hard.
My younger sister let out a soft "Oh," unconsciously lifting her hips to meet the rod, her neck arching back, her hands gripping my waist tightly. With each thrust, she twisted my muscles.
Having held back for so long, once I was inside, I seized the opportunity, thrusting dozens of times in quick succession, each time faster and deeper than the last, my lower abdomen slamming against her vulva, the room filled with the sounds of "slap slap slap."
Perhaps because her husband and sister were nearby, my younger sister kept her eyes tightly shut, her brows furrowed, her mouth tightly shut, uttering not a sound, letting me thrust forcefully. I thrust about a hundred times, but she showed no reaction, and I couldn't tell how she felt. The only movement was her large breasts, heaving with each thrust, bouncing up and down with the rhythm of the slapping, incredibly sexy.
I was immediately aroused again, so I changed positions, spreading her legs and wrapping them around my waist, leaning forward to press my upper body against hers, bringing our chests into intimate contact.
My sister still didn't dare open her eyes, but she accurately guessed the position I wanted from my changes. She obediently opened her arms, wrapped them around my neck, and then turned her face to the side, as if she still couldn't look at me even with her eyes closed.
I moved my hips, trying a couple of times, but found the angle was wrong. Although my penis had stayed inside her when we changed positions, now our bodies were almost parallel, and most of my penis was pulled out, with only the glans remaining on the side. It would slip out with a slight pull.
I then remembered that I had rushed in too quickly and forgotten to use a pillow. I couldn't bear to leave her breasts, so I remained on top of her, reached for a pillow, and placed it under my sister's buttocks. My sister finally opened her eyes and glanced at me. Seeing that I couldn't easily put the pillow in because my hand was behind my back, she released my neck, took the pillow, and obediently raised her buttocks to place the pillow under her. My sister
's gaze also swept over my wife and brother-in-law. They'd said we could do whatever we wanted, but I knew they were really unwilling to give up. They'd seized the opportunity to barge in earlier, and now they were lingering in the room, refusing to leave, their expressions a mix of bitterness and sullenness as they watched our performance.
I didn't care about their stares anymore. I gripped my hard rod and thrust it in again. Although the entrance was already quite raised by the pillow, and I could feel my sister arching her hips to meet my penis, our tools still created a significant angle, preventing me from going very deep.
But my attention had shifted to her upper body, pressed against her soft, warm breasts. My nipples rubbed against hers, her breasts flattened by my pressure, enveloping my chest. Amidst this large, warm, soft mound, two hard little bumps rubbed against my nipples, sending a tingling, numb sensation through me.
I embraced her body, ecstatically lowering my head to her full, white shoulders. My boiling blood released waves of heat that sprayed onto her shoulders.
As I lay down, the sensation below intensified. My sister was a voluptuous woman, her abdomen soft and supple. With each thrust of my hips, I rubbed against her smooth belly, our pubic hairs intertwining like sandpaper against each other's skin.
Due to the position, my penis and vagina formed a strong, acute angle. It didn't penetrate deeply, but it penetrated powerfully, like a stick inserted at an angle, the base pressing tightly against the entrance, the glans pressing firmly against the vaginal walls. Each thrust seemed to pull the vagina out a little, each push seemed to bend it slightly.
I slowly thrust, completely immersed in pleasure. My sister seemed to have forgotten her husband and sister's presence; her hands, which were wrapped around me, began to gently stroke my back. It seemed she was also beginning to enjoy the sex.
I suddenly remembered that my wife loved the rhythmic variation of nine shallow thrusts followed by one deep one, saying it was more stimulating than just fast attacks. Maybe my sister-in-law had the same preference.
So, I spread her legs on either side of my body, held her calves with both hands, and straightened myself up, positioning my penis directly at her entrance. I gently thrust a few times, then suddenly thrust in hard, all the way in. Now our bodies were almost perpendicular, our penises perfectly aligned with her opening. This sudden thrust reached the deepest point, catching my sister-in-law off guard. She cried out "Ah!" and reflexively jerked her head back, her beautiful hair flying to the side. She grabbed the sheets with her outstretched hands, her body tensing and arching, seemingly preparing for my next attack.
But I didn't use any more force. I gently thrust in and out four or five more times, waiting for her body to gradually relax, before suddenly thrusting in hard again. My sister-in-law let out another "Mmm," and out of the corner of my eye, I saw that even my wife and brother-in-law seemed to move slightly.
The "nine shallow, one deep" technique is said to be ineffective; in practice, the ratio is often four to one or five to one, otherwise the woman gets too impatient. I changed it to five shallow, one deep with my sister, and she quickly adapted to my rhythm. Every time I thrust deeply, she would involuntarily moan, just like before.
All night she had been like a sleeping beauty, letting me do as I pleased. Now, finally moaning, she really fueled my passion, her body's desire surging. I immediately increased the speed, from five shallow, one deep to four shallow, one deep, from three to one to two to one, and finally just one deep, one shallow.
Each speed adjustment brought an unexpected, premature deep penetration, catching my sister off guard, causing her to scream. Then, as the speed stabilized, the screams subsided, turning into low moans.
I found this changing rhythm very interesting. After one shallow penetration, I suddenly stopped, pulled out my penis, and remained still. My sister was ready for a deep thrust, even letting out a soft "Mmm," when suddenly there was no movement below. She quickly looked up at me, her eyes blinking as if asking, "What happened?" I chuckled, then used all my strength to thrust my entire body in quickly and forcefully.
My sister giggled, letting out a soft "Mmm," and playfully slapped me, saying, "You naughty brother-in-law." These two sisters were exactly alike. I often used this "suddenly missing" trick on my wife, and every time she would react with a playful snort and a playful scolding, "You naughty thing."
I turned my head, intending to wink at my wife, but what I saw was her gently stroking her brother-in-law's penis. My movements slowed down—was this really my wife? Although her husband was having sex with her sister, it was all pre-arranged, for the purpose of having a child, not for pleasure. Although she had touched that penis, it was for cooperation, not for pleasure. In this completely unnecessary situation, what reason is there to help someone masturbate?
My sister sensed my sluggishness and looked in the direction I was looking. My wife stopped what she was doing, lowered her head, and tried to pull her hand away. But my brother-in-law firmly grabbed her hand, avoiding our gaze, but without hesitation, he tightened his grip and continued stroking her. I sighed inwardly, sensing something was about to happen, but I couldn't stop it. So I focused my attention back on my sister, mustered double the desire, and thrust in forcefully. My sister was still staring in disbelief when my sudden thrust made her scream again. This time, I didn't bother with any back and forth; every time I thrust all the way in, until it was bloody. My sister couldn't hold back any longer and began to groan loudly.
Actually, after all this time, she was already in the mood, but she had been suppressing it at the beginning, trying to maintain a mask of "not enjoying herself." Suddenly seeing her sister and husband enjoying themselves first shattered that mask. Plus, I suddenly increased the intensity of my attacks. The mental relaxation combined with the physical stimulation meant it was no longer just soft moans, but loud, unrestrained "ahhh!"
I felt restless all over, filled with an uneasy excitement, yet I couldn't pinpoint what was making me uneasy. I could only channel all my strength into my groin, thrusting wave after wave into her. Thank goodness I had the foresight to masturbate yesterday; otherwise, with today's intense stimulation, I probably would have ejaculated long ago. My sister lay limply on the bed, her arms outstretched to her sides, her legs held in my hands. She was too busy moaning loudly to care about anything else.
Seeing my sister so passionately enjoying sex, my lust intensified rapidly. Finally, I forcefully ejaculated my thick semen into her vagina, spraying it into her uterus.
Unexpectedly, after ten months of pregnancy, my sister gave birth to twins, a boy and a girl. While my wife shared in my sister's marital happiness, she was also extremely jealous and wanted me to implant twins in her womb as well.
[The End]

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