I walked in on them by accident. My sister Lisa, twenty-two and naked on the couch, had her legs spread wide while our older brother Mike, twenty-four, knelt between them with his tongue buried in her pussy. She was moaning loud, grinding on his face, and he had two fingers pumping into her while his own cock stood rock hard and leaking. They both froze when they saw me, but Lisa just grinned and said, "Close the door, little brother. You're next."
I was twenty-one, hard as fuck in seconds, and too turned on to think straight. I locked the door and stripped. Lisa pulled me over by my dick and started sucking me deep while Mike kept eating her out. Her mouth was hot and sloppy, taking me to the back of her throat like she'd been practicing. Mike looked up, eyes dark, and said, "Fuck her with me. She wants both of us."
Lisa climbed on top of Mike first, sinking down on his thick cock with a filthy groan. I got behind her, spit on my fingers, and worked two into her ass while she rode him. She pushed back, begging for more. "Put your cock in my ass, Jake. Do it now." I lined up and pushed in slow, feeling Mike's dick through the thin wall inside her. We started fucking her together, me in her ass, him in her pussy, our balls slapping and rubbing.
It got raw fast.
Lisa was screaming, coming hard around both of us, her holes squeezing tight. Mike and I kept going, our rhythm syncing until we were pounding her in sync. Then Mike pulled out and told me to switch. I slid into Lisa's dripping cunt while he pushed into her ass. She came again, soaking my cock. We flipped her onto her back. Mike fucked her mouth while I hammered her pussy, then we switched so I could throat-fuck her too.
Mike and I ended up side by side on the couch, cocks standing up together. Lisa knelt and sucked us both, alternating, then tried to take both heads in her mouth at once. Spit ran down our shafts. Mike reached over and wrapped his hand around my cock, stroking me while she licked my balls. I did the same to him, jerking his thick meat while we watched each other. It felt too good to stop. Lisa told us to kiss. We did, tongues messy, still stroking each other while she fingered herself watching.
We moved to the bedroom. Lisa on all fours, Mike fucking her pussy from behind while I fed her my cock. Then he pulled out and we double-penetrated her again, this time both in her pussy, stretching her wide. She came so hard she squirted all over us. Mike and I kept thrusting, our cocks sliding together inside her, until he groaned and unloaded deep in her. I pulled out and shot ropes across her tits and face.
We weren't done. Lisa made us sixty-nine while she watched, Mike sucking my cock while I sucked his. It tasted like her pussy and his cum. We swallowed each other down, then she joined, all three of us licking and sucking until Mike came in my mouth and I came in Lisa's. She kissed us both, swapping the loads.
By the end we were a sweaty, cum-covered mess on the bed, breathing hard. Lisa smiled and said, "This is our new normal." Mike nodded, hand still lazily stroking my softening dick. I knew we were just getting started with these incest bi sex stories of ours.
