We were alone in the house again, just like every summer when our parents took their long trips. I was twenty-two and she was twenty-one, both of us stuck in the same old routine that always ended the same way lately. She walked into the living room wearing nothing but one of my old shirts, the hem barely covering her ass. I knew what she wanted before she even spoke.
"Come here," she said, voice low. I stood up and crossed the room. She dropped to her knees right there on the carpet and yanked my shorts down. My cock sprang out, already hard from the sight of her. She wrapped her lips around it without hesitation, sucking hard and fast like she had been thinking about it all day. Spit ran down her chin as she took me deeper, gagging a little but not stopping.
"Fuck, sis, that's good," I growled. She looked up at me with those eyes and moaned around my shaft. I grabbed her hair and fucked her mouth a few strokes, pushing until her nose touched my stomach. She pulled off gasping, strings of saliva connecting her lips to my dick.
"Want your cum in my pussy tonight," she said, standing up and stripping the shirt off. Her tits bounced free, nipples stiff. She turned around, bent over the couch arm, and spread her legs. Her pussy was already wet, lips puffy and shiny. I stepped up behind her and rubbed my cockhead up and down her slit, coating it in her juices.
I pushed in slow at first, then slammed the rest of the way. She cried out and pushed back against me. I gripped her hips and started pounding, the sound of skin slapping filling the room. Her tight cunt gripped me with every thrust, milking my shaft. "Harder," she begged. "Fuck your sister harder."
I reached around and rubbed her clit while I drove into her. She came quick, pussy clenching and flooding around my cock, but I didn't stop. I kept slamming, balls slapping her ass, until I felt my own load building. I pulled out at the last second, stroked twice, and shot thick ropes of cum across her lower back and ass cheeks. She reached back and rubbed it into her skin, moaning.
We weren't done. She spun around, dropped to her knees again, and sucked me clean, tasting her own pussy on my cock. Then she pushed me onto the couch and climbed on top. She sank down onto me, taking every inch into her soaked hole. She rode me fast, tits bouncing, grinding her clit against me with every drop of her hips. I grabbed her ass and spread her cheeks, watching my cock disappear into her again and again.
"Fill me up this time," she panted. "Cum in my pussy. Breed your sister." That pushed me over. I thrust up hard as she came again, her walls pulsing. I exploded inside her, pumping shot after shot of hot cum deep into her cunt. She kept riding through it, milking every drop until it leaked out around my shaft and down my balls.
We stayed like that for a minute, breathing hard, my cock still twitching inside her. When she finally lifted off, thick white cum oozed from her pussy and dripped onto my stomach. She scooped some up with her fingers and licked them clean, then leaned down to kiss me, sharing the taste.
Later that night we moved to her bed. She got on all fours and I fucked her from behind again, this time pulling out to paint her pussy lips with another load before pushing back in to mix it inside her. She came so hard she shook. We kept going until the sheets were soaked and she was full and leaking, both of us finally satisfied for the night.
Every time after that it was the same raw need. No talking about it, just her pussy and my cock and the cum we left inside her.
