I was two months into my sophomore year when my sister transferred to the same college. She showed up at my dorm room door one Friday night with a duffel bag, wearing a tight tank top and shorts that barely covered her ass. "My roommate bailed," she said. "Can I crash here till they find me a spot?"
Her name was Jess, nineteen, same as me. We weren't close growing up, but we both knew the rules back home. Now we were adults sharing a tiny room with one bed because the dorm was packed.
That first night she stripped down to panties and climbed in next to me. I tried to keep my back to her but her tits brushed my arm when she rolled over. By morning my cock was rock hard and pressed against her ass. She didn't move away. Instead she pushed back a little and whispered, "You awake?"
I reached around and grabbed her tit. She moaned and shoved her hand into my boxers, wrapping her fingers around my dick. "Fuck, big brother," she said. "This is what you got for me?"
We didn't talk much after that.
I yanked her panties down, spread her legs, and shoved my cock straight into her wet pussy. She was tight and hot and she grunted every time I bottomed out. I fucked her hard on that narrow bed, her legs hooked over my shoulders, her nails digging into my back. She came first, pussy clenching around me, then I pulled out and shot thick ropes across her stomach and tits.
We didn't stop there. Every night after classes we locked the door and went at it. She liked it raw and fast. I'd bend her over the desk, yank her jeans down just enough, and slam into her from behind while she reached back to spread her ass cheeks. "Deeper," she'd growl. "Fuck your sister's cunt harder."
One afternoon I came back from the library and found her on the bed in just a thong, fingering herself. "Get over here," she ordered. I dropped my pants and she crawled over, taking my cock in her mouth right away. She sucked sloppy and loud, spit running down her chin while she looked up at me. When I was close she pulled off and said, "Cum in my mouth." I did, and she swallowed every drop then licked me clean.
We started skipping classes to stay in the room. She'd ride me reverse cowgirl so I could watch my cock disappear into her pussy, her ass bouncing. I'd slap it red and call her my dirty little sister. She loved it. "Tell me how wrong this is," she'd pant. "Tell me you're fucking your own sister."
I flipped her onto her back and pounded her until the bed frame slammed the wall. She wrapped her legs around me and came again, soaking the sheets. After I filled her up she kept me inside her, grinding slow, making sure none of my load leaked out.
By the end of the semester the whole floor knew something was going on. We didn't care. Jess moved in for good. Every night was the same: door locked, clothes off, straight to fucking. Sometimes she'd wake me up with her mouth on my cock. Sometimes I'd wake her by pushing inside her while she was still half asleep, and she'd just moan and push back.
We kept it going through junior year too. Same room, same bed, same filthy routine. She'd text me during lectures: "Come back and fuck me now." I'd skip and we'd spend the afternoon with her on all fours or riding me until we were both dripping sweat. No romance, just raw need. She wanted her brother's cock and I wanted my sister's pussy, and we took it whenever we could.
Graduation came and went but the habit never stopped. Even after we got our own places we'd meet up and fuck like we were still in that cramped dorm room. Hard, fast, dirty, no apologies. Just two adults who knew exactly what they wanted from each other and took it.
