I slammed into her from behind, my cock buried balls-deep in her tight wet cunt. "Fuck, sis, you're squeezing me so hard," I growled, gripping her hips and pounding harder. Rachel moaned loud, her big tits swinging under her as she pushed back against every thrust. We were in the living room, lights on, door unlocked, too horny to care after years of sneaking around. Her pussy was dripping down my shaft, making filthy wet sounds every time I drove in.
"Harder, big brother," she begged, reaching back to spread her ass cheeks for me. "Fill that pussy up." I slapped her ass red and gave her exactly what she wanted, my balls slapping her clit with every stroke. She was close, I could feel it, her walls fluttering around my thick cock.
Then the front door opened.
Mom and Dad stood there, grocery bags in hand, staring straight at us. Rachel froze but I didn't pull out. My cock twitched inside her as the shock hit. "What the fuck?" Dad shouted, dropping the bags. Mom just stared, mouth open, eyes locked on where my dick was still stuffed in her daughter's cunt.
Rachel didn't move away. Instead she looked back at me with that dirty little grin. "Don't stop," she whispered. "Let them watch."
I started thrusting again, slow and deep, right in front of them. "You heard her," I said, voice rough. "We've been fucking for years. You want to see the real thing?"
Mom's face flushed dark red.
Dad looked pissed but neither of them left. They just stood there while I fucked my sister harder, her moans getting louder. Rachel came first, screaming my name, her pussy clamping down and milking my cock. I followed right after, pumping thick ropes of cum deep inside her until it leaked out around my shaft.
When I finally pulled out, cum dripping from her swollen slit, the room was dead silent except for our breathing. Mom's eyes were glued to my still-hard cock, shiny with our mixed juices. Dad's pants were tented.
Rachel turned around, spread her legs on the couch, and scooped some cum from her pussy with two fingers. She licked them clean while staring at our parents. "Your turn to join or get out," she said, voice steady and filthy. "We've been caught. Might as well make it a family thing."
Dad dropped the rest of the bags. Mom took a shaky step forward. And that was the night everything changed.
