I never planned on fucking my sister. It just happened one humid summer night when the AC broke and the house felt like it was sweating with us. Mia was twenty-two, home from college, and I was twenty-five, stuck working remote in our parents' old place while they were gone for the month. We had always been close, too close maybe, the kind of siblings who shared everything except the one thing that started burning between us after too many late-night talks on the couch.
That night she walked out of her room in nothing but a thin tank top and panties, complaining about the heat. Her nipples were hard against the fabric, and her ass cheeks peeked out with every step. I tried not to stare, but my cock twitched anyway. She caught me looking and smirked.
"See something you like, big brother?" she said, voice low and teasing.
I should have laughed it off. Instead I stood up, crossed the room, and grabbed her hips. "Don't start something you can't finish, Mia."
She pressed against me, feeling how hard I already was. "Who says I can't finish it?"
Her mouth was on mine before I could answer. It was messy, hungry, tongues sliding deep while her hand shoved straight down my shorts and wrapped around my cock. She stroked me rough and fast, thumb rubbing over the head, spreading the precum. I yanked her tank top up and sucked one nipple into my mouth, biting just hard enough to make her moan.
We didn't make it to a bed. I pushed her onto the couch, ripped her panties aside, and dropped to my knees. Her pussy was shaved smooth and already dripping. I buried my face between her legs, licking from her clit to her asshole in long, filthy strokes. She tasted sweet and salty, and she grabbed my hair, grinding on my tongue while she called me her dirty brother.
"Fuck, yes, eat that pussy," she panted. "You've wanted this for years, haven't you?"
I answered by shoving two fingers inside her and curling them against her spot while I sucked her clit. She came hard, thighs shaking around my head, juices running down my chin.
Then it was my turn. I stood, dropped my shorts, and fed her every inch of my cock. She took it like she had been practicing, throat opening up, gagging wetly but never pulling back. Spit ran down her chin onto her tits. I fucked her face until my balls were tight and aching, then pulled out and flipped her over.
Bent over the arm of the couch, ass up, she looked back at me. "Do it. Fuck your sister. Fill me up."
I slammed into her in one thrust. She was tight, hot, and soaked. I gripped her hips and pounded her, the wet slap of skin loud in the quiet house. Every stroke made her moan louder. I reached under and rubbed her clit while I fucked her, feeling her pussy clench around me.
"Don't stop," she begged. "Harder. Make me come on your cock."
I gave it to her. Deep, rough strokes that made her tits swing and her ass ripple. When she came again she screamed my name, her cunt pulsing and milking me. I didn't last much longer. I buried myself to the hilt and unloaded, pumping thick ropes of cum deep inside her.
We didn't stop there. We fucked on the kitchen table, in the shower, on the floor of the hallway. She rode me reverse cowgirl so I could watch my cock disappear into her while she played with her clit. I took her from behind again, this time with a finger in her ass, stretching her while she begged for more. By morning we were sticky, sore, and already planning the next round.
It became our secret. Every night after that, once the sun went down, Mia would come find me wearing less and less. Sometimes she would drop to her knees the second she saw me, sucking me off like she needed my cum to survive. Other times I would wake up to her straddling my face, grinding her wet pussy on my tongue until she squirted.
We talked dirty the whole time. She called me her brother while I fucked her. I told her how tight her incest cunt felt and how I was going to keep filling it every chance I got. We both knew it was wrong, and that only made it hotter. The risk, the taboo, the way her body responded to mine like it had been waiting forever.
By the end of the month we had tried everything. Anal, with her bent over the bathroom sink while I worked my cock into her ass slow and steady until she was pushing back for more. Sixty-nine on the living room rug, her mouth full of my dick while I licked her from clit to hole. She even let me tie her wrists with a belt and fuck her hard while she begged me to come inside her again.
When our parents came home we acted normal. But every time we were alone, even for five minutes, my hand was under her skirt or her mouth was on my cock. We were addicted.
And we still are. Those free to read incest sex stories you see online? Ours is better because it's real. Every filthy detail. Every load I pump into my sister. Every time she whispers "more, brother" while I stretch her open.
We never stopped. We just got better at hiding it. And every time she looks at me across the dinner table with that secret smile, I know exactly what she's thinking about. The next time I get to bury my cock in her and remind us both who she really belongs to.
