I slammed the door behind me after another fight with our parents, but it was my sister Lena who caught my eye in the hallway. Twenty years old, tight body, and that look in her eyes that said she was done pretending too. "They're fucking idiots," she muttered, but her voice dropped when she saw how hard I was staring at her ass in those tiny shorts. We both knew what was coming. Months of tension, stolen glances, and now the house was empty for the weekend.
She turned and bent over the kitchen counter on purpose, pushing that round ass out. "You keep looking, Jake. You want it?" I didn't answer with words. I grabbed her hips, yanked the shorts down, and slapped her bare cheek hard. Her skin reddened instantly. "Yeah, I want that ass," I growled, already freeing my cock. It was thick and throbbing, veins pulsing as I spit on my hand and rubbed it over her tight hole.
Lena moaned low and nasty. "Do it. Fuck my ass like you own it. We've both wanted this." I pressed the head against her puckered ring and pushed. She was tight as hell, gripping me like a fist. Inch by inch I sank in, her ass stretching around my shaft while she panted and pushed back. "Deeper, brother. Shove that cock up my shithole." The dirty words made me throb harder. I bottomed out, balls pressed against her pussy, and started thrusting.
Each stroke was raw and deep. Her ass cheeks clapped against my hips with every slam. I reached around and rubbed her clit while I fucked her hole, feeling it clench and flutter. "This is what you get for teasing me all year," I grunted. "My dick buried in your ass." Lena pushed back harder, meeting every thrust. "Yes, fuck it. Pound your sister's ass. Fill it up." Her voice was filthy, begging for more.
I pulled out halfway, spat on her stretched rim again, and drove back in balls-deep. The wet sounds filled the kitchen. Her asshole sucked at my cock like it didn't want to let go. I slapped her ass redder, left handprints, then grabbed her hair and yanked her head back. "Tell me how much you love your brother's cock in your ass." She gasped out, "I fucking love it. Wreck my hole. Make me your anal slut."
We moved to the couch. She got on all fours, ass up high. I mounted her again, spreading her cheeks wide so I could watch my cock disappear into that tight ring. It gaped a little each time I pulled back, then swallowed me whole on the next thrust. Sweat dripped down my chest onto her back. I reached under and fingered her pussy, feeling how soaked she was from getting her ass fucked. "You're dripping just from taking it in the ass," I said. "Such a dirty girl."
Lena came first, her asshole spasming around my dick as she screamed. Her whole body shook, but I didn't stop. I kept pounding through her orgasm, making her hole even looser and slicker. When I was close, I pulled out, flipped her onto her back, and pushed her legs up to her chest. I slammed back into her ass in one stroke, folding her in half.
Her eyes rolled as I jackhammered her hole, balls slapping her ass with every brutal thrust.
"Take it," I snarled. "Take every inch in your ass." She clawed at my shoulders. "Cum in me. Fill your sister's ass with cum." That did it. I buried myself to the hilt and unloaded, thick ropes of cum pumping straight into her guts. Her asshole milked me dry, pulsing and squeezing until I was empty. I stayed buried, letting it leak out around my shaft.
We didn't stop there. Later that night she rode me reverse, sinking her ass down on my cock again while I watched it stretch her wide. She bounced hard, filthy moans echoing as she worked her hole on me. "Watch your cock disappear in my ass," she said, reaching back to spread herself. I grabbed her hips and thrust up to meet her, pounding from below until I filled her a second time.
By morning we were still going, her ass sore and gaping, cum leaking down her thighs, but she kept begging for more. We both knew this was just the start of our secret.
