I slammed the door behind me after another shitty day at work, and there she was again, my little sister Mia, sprawled on the couch in nothing but a tiny tank top and panties. She was twenty-two, I was twenty-five, and we'd been living together since our parents split. The heat in the apartment was brutal, but her nipples poking through that thin fabric made my cock twitch every damn time.
"Fuck, Mia, put some clothes on," I growled, dropping my keys.
She smirked, spreading her legs a little wider. "It's hot as hell in here. You staring again, big brother?"
I was. My eyes went straight to the wet spot on her panties. We'd been dancing around this for months, the dirty jokes, the accidental touches, the way she'd moan loud enough for me to hear when she fingered herself at night. Tonight the tension snapped.
I crossed the room, grabbed her by the hair, and pulled her up. "You want it raw? Fine." I shoved my hand down her panties and found her soaked pussy. Two fingers slid right in, knuckle deep. She gasped and bucked against my palm.
"Jesus, your cunt's dripping," I said, pumping hard. "Been waiting for your brother to finger-fuck you all day?"
Mia moaned and clawed at my jeans. "Shut up and give me that cock. I know you've been jerking off thinking about it."
I yanked my pants down. My dick sprang out, thick and already leaking. She dropped to her knees and swallowed me in one go, lips stretching around the shaft. Her tongue worked the underside while she gagged herself deeper. Spit ran down my balls. I fucked her face, holding her head with both hands, thrusting until her eyes watered.
"Take it all, slut," I grunted. "That's your brother's dick in your throat."
She pulled off, strings of saliva connecting her mouth to my cock.
"Fuck me. Now."
I bent her over the couch arm, ripped her panties aside, and slammed inside. Her pussy was tight and hot, gripping me like it was made for incest. I pounded her hard, skin slapping, her ass jiggling with every thrust. She reached back and spread her cheeks so I could watch my cock disappear into her.
"Harder," she begged. "Fill your sister's cunt."
I gave it to her, balls-deep strokes, one hand yanking her hair, the other smacking her ass red. She came first, pussy clenching and squirting around me, soaking the couch. I didn't stop. I flipped her onto her back, hooked her legs over my shoulders, and drilled down into her. Her tits bounced with every thrust. I leaned in and sucked a nipple hard while I fucked her.
"Look at you, taking brother cock like a whore," I said between thrusts. "You love this dirty shit."
Mia nodded, eyes glassy. "Don't stop. Cum in me. Breed your sister's pussy."
That pushed me over. I buried myself to the hilt and unloaded, thick ropes of cum pumping deep inside her. She came again when she felt it, legs shaking, nails digging into my back.
We didn't stop there. I pulled out, watched my load leak from her swollen hole, then flipped her again and took her ass while she fingered her clit. She screamed into the cushion as I stretched her tight hole. We fucked until we were both drenched in sweat and cum, switching positions on every surface in the living room.
Later, lying tangled on the floor, she kissed my chest and whispered, "Round two in the shower?"
I was already hard again. "Get up. I'm gonna fuck that mouth while the water runs."
We stayed in that shower until the hot water ran out, her on her knees again, me holding her head under the spray while I used her throat. After that it became our new normal: raw, no-holds-barred sex whenever we wanted. No guilt, just pure filthy release.
Mia moved into my room that week. Every night ended the same way, with her pussy or ass full of my cum and both of us too satisfied to care about anything else. The taboo only made it hotter. We were adults, we knew exactly what we were doing, and we couldn't get enough.
