I slammed the front door shut and tossed my keys on the counter. "Sis, you home?" My voice echoed through the empty house. Summer break meant we had the place to ourselves while the parents were gone for two weeks. Perfect timing for what we'd been texting about all morning.
Mia appeared at the top of the stairs wearing nothing but a tiny tank top that barely covered her tits and a pair of cotton panties already damp at the crotch. "Took you long enough, big brother. I've been fingering myself waiting for that cock."
I didn't waste time with small talk. I grabbed her by the waist, spun her around, and bent her over the banister. "Spread those legs. Show me that wet pussy." She obeyed instantly, hooking her thumbs in the waistband and yanking her panties down to her knees. Her shaved cunt glistened, lips puffy and slick. I dropped my shorts, freed my throbbing dick, and slammed it straight in without warning.
"Fuck yes!" she screamed. "Pound your sister's cunt, fill me up!" I gripped her hips hard enough to leave marks and drove into her hard and fast. The wet slapping sound of skin on skin filled the hallway. Every thrust made her ass jiggle and her juices drip down my balls. She reached back and spread her cheeks wider so I could watch my thick shaft disappear inside her tight hole.
I pulled out, spun her to face me, and shoved her to her knees. "Suck it. Taste your own pussy on my cock." Mia opened wide and swallowed me to the root, gagging but not stopping. Spit ran down her chin as she bobbed like a desperate whore, one hand rubbing her clit furiously. "That's it, you filthy incest slut. Choke on brother's dick."
She pulled off long enough to beg, "Cum in my mouth first, then fuck my ass." I grabbed her hair and face-fucked her until my balls tightened. Thick ropes of cum shot down her throat. She swallowed every drop, then licked me clean with a filthy smile.
We didn't even make it to the bedroom. I carried her to the living room couch, flipped her onto all fours, and spread her ass cheeks. Her tight pink hole winked at me. I spat on it, worked two fingers in, then lined up my still-hard cock and pushed. Mia moaned loud as I stretched her asshole open. "Deeper, fuck my ass raw!" I buried myself balls-deep and started pounding.
Her fingers worked her clit while I wrecked her back door.
We switched positions constantly. Missionary so I could watch her face twist in pleasure while I railed her pussy again. Cowgirl where she rode me reverse so I could slap her ass red. She came hard twice, squirting all over my stomach the second time. I flipped her onto her back, folded her legs to her chest, and jackhammered her until I unloaded deep in her cunt, pumping every drop inside.
We lay there panting, cum leaking out of both holes. Mia grinned and stroked my softening cock. "Round two in the shower? I want you to piss on me after you fuck my throat again."
I was already getting hard. "Get the water running, little sister. We're just getting started on these free incest sex stories."
