My sister sat there on her bed, reading a book for school.
I walked into her bedroom, completely naked having just gotten out of the shower, my cock completely soaked.
My sister looked up and saw it and gasped, dropping her book and covering her mouth with her hands.
"John.. what are you.." She could hardly speak.
I walked closer to her, standing next to the bed as she stared down at my cock. Slowly she touched the vein with her finger, tracing up to the head.
"Its so hard!" she exclaimed, slowly wrapping her hand around it, beginning to stroke it. "Why didn't you tell me you had such a big dick?" She was smiling now, climbing out of bed and onto her knees. "I wonder what it tastes like..."
She licked the head like a popsicle, her face full of joyful pleasure at each lick. She moved her warm tongue up and down the shaft, looking up at me once, but mainly looking at the big juicyness that was my cock. Then she took the whole thing in her mouth, one hand holding onto my hip, the other one resting on my ballsack. I put my hand on her head and pushed as she gagged on it. The duration of her gagging was surprising. Did my sister have experience? Could she? She was 15...
She then pulled my dick out of her mouth and smiled and laughed, cum around her mouth. "You are so good John!!" she giggled, looking up at me and grabbing my hand and sliding it into her underwear. Her pussy was wet, and she moaned as I rubbed it. She kissed me passionately, her lips tasting perfect. Her tongue, just having graced my cock, ran around my tongue now, closing her eyes. She smelled of sweetness, having had just taken a shower before I had. Her hair was long and smooth, and her eyes glowed with delight when she opened them. I wanted to fuck her so bad. And she wanted me to too.
"Fuck me!" she said, laying on the bed and opening her legs up to expose a dripping wet pussy, as she bit her lip and looked at me seductively.
Then the door opened, and standing there was my Dad.