I never planned on banging my own sister, but once I saw that thick cock swinging between her legs, all bets were off. Lisa had come home from college looking different—tits bigger, hips wider, and a hard dick she couldn’t hide anymore. She was 22, legal in every way, and she was my blood. We’d grown up sharing a bathroom, and now she was standing in our old bedroom with her skirt hiked up, showing me everything.
“Fuck, you’re really packing,” I said, staring at her smooth shaft. It was long, veiny, and already leaking at the tip. My own cock strained against my jeans.
Lisa smirked, voice low and dirty. “You always stared at me in the shower, big brother. Now you get to taste it.”
I dropped to my knees right there on the carpet. Her balls hung heavy and full. I licked from the base up to the head, tasting the salt of her pre-cum. She grabbed my hair and pushed forward, sliding that tranny dick into my mouth. I gagged but kept sucking, tongue working the underside while she fucked my throat.
“Deeper, you slut,” she growled. “Swallow your sister’s cock like you’ve always wanted.”
I did. Spit ran down my chin as she pumped in and out. My hand went to my own dick, stroking fast. She pulled out, hauled me up, and bent me over the bed. Her fingers found my hole, slick with lube she’d already prepped. One finger, then two, stretching me open while she whispered filthy shit in my ear.
“Gonna fuck my brother’s tight ass. Gonna breed you full of my cum. You want your sister’s load, don’t you?”
“Yeah,” I grunted. “Give it to me.”
She lined up and pushed in. That thick cock stretched me wide, burning then melting into pure heat. She started pounding, balls slapping my ass with every thrust. The bed creaked. Skin slapped skin. Her tits pressed against my back as she reached around and jerked my cock in time with her strokes.
I came first, shooting ropes across the sheets while she kept railing me. She didn’t stop. She flipped me onto my back, legs over her shoulders, and drove in deeper. Her face was flushed, lips parted, that pretty trans cock disappearing inside me again and again.
“Gonna fill you up,” she panted. “Take every drop from your sister.”
She buried herself to the hilt and unloaded. Hot cum flooded my guts, pulse after pulse. She stayed inside, grinding slow while the last spurts leaked out around her shaft. When she finally pulled free, her cum dripped down my crack onto the bed.
We didn’t talk much after. Just cleaned up, got dressed, and went downstairs like nothing happened. But later that night she came to my room again. This time I fucked her. I bent that tranny ass over and drove my cock into her while she moaned my name. We switched back and forth all weekend—her in me, me in her, mouths, hands, every hole. Family rules didn’t exist anymore, just raw need and the wet sound of two siblings using each other until we couldn’t walk straight.
By Sunday night we’d both come so many times the sheets were stiff with dried cum. She left for school Monday, but we already had plans for the next break. Next time I’d let her invite a friend. Maybe make it a real family affair.
