I slammed the door behind me after another bullshit family dinner, my cock already half-hard just thinking about her.
My little sister, eighteen and dripping with that forbidden heat, had been teasing me all night with those short shorts and the way she licked her lips every time our eyes met. Mom and Dad were clueless, but we both knew what was coming once the lights went out.
She was waiting in her room like always, door cracked, ass up on the bed with her phone open to some dirty Tumblr feed. "You took forever," she whispered, voice low and filthy. "Get in here and fuck your sister."
I didn't waste time with talk. I kicked the door shut, yanked my pants down, and shoved my thick cock straight into her already wet pussy. She was soaked, tight as hell, and she moaned loud when I bottomed out in one thrust. "Fuck yes, big brother, fill that cunt," she grunted, pushing back against me.
I grabbed her hips and pounded her hard, the wet slap of skin on skin echoing in the dark room. Her pussy gripped me like it was made for my dick, milking every inch while I drove deeper. She reached back and spread her ass cheeks so I could watch my cock stretch her open, shiny with her juices. "Cum in me," she begged, "dump that brother load right in my pussy like the slut I am."
I flipped her onto her back, legs over my shoulders, and hammered her missionary so I could watch her face twist with every thrust. Her tits bounced, nipples hard, and she kept whispering nasty shit. "Your cock feels so much better than any boyfriend's. Breed your sister's pussy. Fill it up."
Her walls clenched around me as she came, squirting a little around my shaft, and that pushed me over. I buried myself balls-deep and unloaded, thick ropes of cum pumping straight into her hot cunt. She squeezed every drop out of me, hips rolling to take it all. When I pulled out, my cum leaked from her stretched pussy lips, thick and white, dripping down her ass onto the sheets.
She scooped some up with two fingers and licked them clean, eyes locked on mine. "Round two in the shower? I want you to fuck me from behind while the water runs over us, then cum in my pussy again so it leaks out all night."
We didn't stop until morning, her pussy overflowing with my loads, both of us raw and satisfied from the kind of dirty brother-sister fucking that only gets hotter the more we do it.
