I never planned for it to happen, but the night my stepbrother Mark and I crossed that line, everything we thought we knew about our family shattered in the best possible way. We were both twenty-two, living under the same roof again after college, and the tension had been building for weeks. Our parents were out of town for a long weekend, leaving us alone in the big house with nothing but old memories and new, filthy urges.
It started in the kitchen after dinner. Mark was washing dishes, shirtless, his back muscles flexing under the kitchen light. I stood there in my thin tank top and shorts, pretending to scroll on my phone while my eyes kept drifting to the way his jeans hung low on his hips. You keep staring like that and Im going to think you want something, he said without turning around.
My face flushed hot. Maybe I do, I answered, my voice coming out raw and direct. The words hung there, dirty and honest. He turned, eyes dark, and stepped closer until I could smell the soap on his skin. Say it, sis. Tell me what you want.
I want you to fuck me, I said, blunt and shaking with need. First time, no holding back. I want to feel your cock inside me and know its wrong but right anyway.
Mark didnt hesitate. His mouth crashed onto mine, tongue pushing deep while his hands grabbed my ass and yanked me against the hard bulge in his jeans. We stumbled upstairs to my bedroom, clothes coming off in a rush. He shoved me onto the bed, spread my legs, and buried his face between my thighs. His tongue was relentless, licking my clit in firm strokes until I was soaking and moaning his name.
Fuck, you taste so good, he growled, two fingers sliding inside me, pumping hard. Tight little cunt. Been wanting this since we were kids, havent you?
Yes, I gasped, hips rocking against his hand. Make me come first. Then fuck me.
He sucked my clit between his lips and curled his fingers just right. I came hard, thighs clamping around his head, juices coating his chin. Before the tremors faded he was on top of me, thick cock pressing at my entrance. He pushed in slow at first, letting me feel every inch stretch me open.
Goddamn, youre so wet, he muttered, bottoming out. Taking your stepbrothers cock like a good girl.
He started thrusting, deep and steady, the wet slap of skin filling the room. I wrapped my legs around him, nails digging into his back. Harder, I demanded. Fuck me like you mean it.
Mark slammed into me, pace turning rough. Each thrust hit that perfect spot inside, building another orgasm fast. I reached down and rubbed my clit in time with him. Im gonna come again, I warned.
Do it. Come on my dick, he ordered, voice low and filthy.
I shattered around him, pussy pulsing and squeezing. He kept pounding through it, chasing his own release. Where do you want it? he asked, breathing ragged.
Inside, I moaned. Fill me up.
He groaned, hips stuttering as he pumped hot cum deep into me. We stayed locked together, breathing hard, his cock still twitching inside my slick heat.
After a minute he pulled out and lay beside me, cum leaking down my thighs.
That was our first time, he said, fingers tracing my breast. Not the last.
I smiled, already reaching for him again. Good. Because I want you to fuck my ass next.
We spent the whole weekend exploring every dirty first we could think ofme riding him reverse cowgirl while he spanked my ass red, him eating me out on the kitchen table, both of us coming again and again until we were sore and satisfied. By the time our parents came home we had a secret that made every family dinner feel electric. We never stopped. That first time just opened the door to everything else wed been craving.
