I was just killing time on that filthy chat site, same as always, swapping raw incest stories with strangers. My username was BroInNeed, and I was typing one-handed about how I'd always wanted to bend my little sister over the kitchen table. The replies were the usual mix of pervs jerking off to the fantasy, but then this one user, SisSecret23, started going back and forth with me in private. Her messages were filthy and specific: she described sneaking into her brother's room at night, stroking his cock while he slept, then climbing on and riding him until he woke up balls-deep inside her.
We went on for hours, describing every wet slap and moan like it was real. By the end I was shooting cum across my keyboard, and she said she was doing the same.
A week later my car broke down on the highway. I was stranded until a woman in a beat-up sedan pulled over. She looked familiar in that vague, hot way, early twenties, tight tank top with no bra, nipples poking through the thin fabric. "Need a lift?" she asked. I climbed in. We started talking, and somehow the conversation drifted to online shit. She laughed and said she killed time on sex story chats. My stomach dropped when she mentioned the exact same site and the exact same username I'd been using.
It hit us both at the same time. She was my actual sister, the one I'd been fantasizing about for years. We sat in stunned silence for a mile, the car suddenly too small. Then she pulled over on a dirt road, killed the engine, and looked at me with that same dirty glint from her messages. "So you're BroInNeed," she said, voice low and rough. "And I'm the sister you want to fuck stupid."
I didn't think. I just reached over, grabbed her by the hair, and kissed her hard. She moaned into my mouth and shoved her hand straight down my pants, wrapping her fingers around my already throbbing cock. "Fuck, it's real," she muttered, stroking me fast and tight. I yanked her tank top down, sucked one hard nipple into my mouth, and she climbed into my lap right there in the driver's seat. Her shorts were already soaked through. She ripped them aside, lined me up, and sank down on my dick in one slick, hot push.
We didn't talk after that. She rode me like she was possessed, slamming her cunt down again and again, the wet sounds filling the car. I grabbed her ass and thrust up to meet her, balls slapping against her. "This is what you wanted in the chat," she gasped. "Your sister's pussy milking your cock." I flipped her onto her back across the seat, hooked her legs over my shoulders, and pounded her deep. She came first, clenching and squirting around me, then I buried myself to the root and flooded her with thick ropes of cum.
We didn't stop there. She sucked me hard again in the backseat, swallowing half my load and letting the rest paint her tits. I ate her out until she screamed, then fucked her doggy-style with her face pressed against the window. Every thrust was dirtier than the stories we'd traded. By the time we finally drove home we were both wrecked, covered in sweat and cum, and we both knew this was only the start. She texted me the next night: "Mom and Dad are out. Come finish what the chat started." I was already hard before I replied.
