We were all adults when it started, me at 25, my sister Lisa at 23, and our older brother Mark at 28. One hot summer night in the family house with the parents gone, the three of us got drunk on the couch. Lisa was in tiny shorts and a tank top with no bra, her nipples poking out. Mark kept staring. I was already hard just watching them flirt.
"Fuck it," Lisa said, standing up and peeling off her top. Her tits bounced free, full and perky. "We've all thought about it. Let's just do it." She dropped to her knees in front of Mark and yanked his shorts down. His cock sprang out thick and veined. She wrapped her lips around it and sucked loud and sloppy, spit running down her chin.
I pulled my own cock out and started stroking. Lisa looked over, eyes glassy. "Get over here, little brother. Feed me that dick too." I stepped up and she switched between us, sucking Mark deep then turning to slurp on mine. Her tongue was hot and wet, working the underside while her hand pumped the base.
Mark stood and stripped her shorts off. He bent her over the couch and slammed into her pussy from behind. Lisa moaned around my cock, the sound muffled and nasty.
"Goddamn, you're tight," Mark grunted, pounding her hard, his balls slapping her ass. I watched her tits swing and her pussy stretch around his shaft, cream coating it.
After a few minutes Mark pulled out and shoved her toward me. "Your turn. Fuck your sister's cunt." I didn't hesitate. I lined up and drove in balls-deep. Lisa was soaked, her walls gripping me like a fist. She pushed back, meeting every thrust. "Harder, you fuck," she hissed. I grabbed her hips and railed her, the wet sounds filling the room.
Mark moved in front of her again. She took both of us, me fucking her from behind while she sucked him. Then we switched positions. Mark lay on the floor and Lisa climbed on, riding him reverse cowgirl so I could watch his cock disappear into her. I knelt in front and she leaned forward to suck me again while bouncing on Mark.
We moved to the bedroom. Lisa on all fours, Mark in her pussy, me in her mouth. We fucked her like that until she came hard, shaking and gushing around Mark's dick. He pulled out and I took his place, sliding into her sloppy wet hole. Mark came on her face, thick ropes across her lips and tongue. She swallowed what she could and kept sucking him clean while I pounded her.
I flipped her onto her back and fucked her missionary, legs over my shoulders so I could go deep. Mark recovered and fed his cock back into her mouth. We used her for another hour, switching holes, taking turns in her pussy and mouth. Lisa came again when Mark fingered her ass while I fucked her. She begged for it in both holes.
Finally I unloaded deep in her cunt, pumping load after load while she milked me. Mark painted her tits. We collapsed in a sweaty, cum-covered pile, breathing hard. Lisa grinned, cum dripping from her chin. "This is just the start," she said. We kept going all night, raw and filthy, no limits between the three of us. By morning we were still fucking, hooked on the family taboo.
