The house was too quiet that night. Mom and Dad were gone for the weekend, leaving just me and my sister Lisa alone in the big empty place. She was 22, two years older than me, and she'd been walking around in nothing but tiny shorts and a tank top that barely covered her tits all day. I couldn't stop staring at the way her ass cheeks peeked out when she bent over.
I found her in the kitchen, leaning against the counter with a beer in her hand. "You keep looking at me like that, little brother," she said, her voice low and rough. "What the fuck are you thinking about?"
I stepped closer, my cock already hard in my jeans. "I'm thinking about how bad I want to fuck you. How wrong it is. How much that makes me want it more."
Lisa set the beer down and pulled her tank top off. Her tits bounced free, nipples stiff. "Then stop thinking and do it. I've been wet for you since we were left alone."
I grabbed her, spinning her around and bending her over the kitchen table. Her shorts came down easy, and I shoved two fingers straight into her pussy. She was soaked, dripping down my hand. "Fuck, sis, your cunt's dripping for your brother's dick."
She moaned and pushed back against my fingers. "Stop teasing. Shove that cock in me."
I unzipped and pulled my thick shaft out. No slow shit. I lined up and slammed into her in one hard thrust. Lisa cried out, gripping the table as I started pounding her. The sound of my balls slapping against her was loud and filthy. "Take it, you dirty slut. Your brother's fucking your tight hole."
She pushed back harder, meeting every thrust.
"Harder. Fuck me like you mean it. Make me come on your cock."
I reached around and rubbed her clit while I drilled her. Her pussy clenched around me, hot and slick. I pulled out for a second, flipped her onto her back on the table, and drove back in. Her legs wrapped around my waist as I fucked her deep, watching her tits bounce with every slam.
Lisa's eyes locked on mine. "This is so fucking wrong. I shouldn't want my brother's cum inside me."
"But you do," I growled, speeding up. "You want me to fill that forbidden pussy."
She came hard, her cunt squeezing me as she moaned loud enough to echo through the house. I didn't stop. I kept fucking her through it until my own orgasm hit. I buried myself to the balls and shot rope after rope of thick cum deep inside her.
We didn't talk much after. She just pulled me down for a rough kiss, tasting like beer and sin. We moved to the couch, and she climbed on top, sliding my still-hard cock back into her cum-filled pussy. "Round two, brother. Don't stop until I'm leaking down my thighs."
I grabbed her hips and thrust up into her, watching her ride me dirty and fast. Her hands were in my hair, pulling hard. "Tell me how much you love fucking your sister."
"I love it," I grunted. "Love how wet your cunt gets for me. Love filling you up with my load."
She came again, grinding down on me, and I followed right after, pumping more cum into her. We stayed like that, breathing heavy, my dick still twitching inside her.
Later in her bed we did it again, slower but just as raw. She sucked my cock first, taking it deep in her throat while I fingered her from behind. Then I fucked her doggy style, pulling her hair and slapping her ass until it was red. Every thrust reminded us how forbidden it was, and that only made us both hotter.
By morning we were sore and sticky, but neither of us regretted a single thrust. The forbidden fruit tasted exactly like we'd both known it would: sweet, dirty, and impossible to stop eating.
