The air in the house was thick with tension, a silent game of cat and mouse we'd been playing for weeks. My step sister, barely 18, had this intoxicating blend of innocence and burgeoning sexuality that drove me crazy. I'd catch her looking at me sometimes, a flicker of something more than familial affection in her eyes.
Today, I thought she was out with her best friend. The house was eerily quiet. I went to grab a soda from the fridge and heard a soft moan coming from her room. Curiosity, and maybe something else, pulled me towards the door. It was slightly ajar.
I peeked inside. There she was, lying on her bed in just a sports bra and tiny shorts, her fingers dancing between her legs. Her face was flushed, her eyes closed, lost in her own world. She whispered, "Oh, god..." and I almost retreated. Almost.
She opened her eyes and saw me. The color drained from her face. "What... what are you doing here?" she stammered, trying to cover herself. She looked incredibly shy, but I could see a spark of something else, a hint of desire beneath the embarrassment. Her big ass shifted as she tried to get comfortable.
"I... I heard you," I admitted, my voice rough. "I couldn't help myself." I stepped closer, the air crackling between us. "You're beautiful."
Tears welled up in her eyes. "Don't," she whispered. "This is wrong. It's familly!" But her voice lacked conviction. I reached out and gently brushed a strand of hair from her face. Her skin was soft, like silk. My hand traveled down to her neck, then lower.
"I know," I said, my voice barely a whisper. "But I want you so badly."
And then, she surprised me. She grabbed my hand and pulled me closer. "Please," she begged, her voice trembling. "Please, fuck me." I didn’t need to be told twice. We fell onto the bed, a tangle of limbs and desperate kisses. She guided me inside, moaning with pleasure. The doggystyle felt primal, raw, and undeniably right. After a frantic reverse cowgirl session, I pulled out and creampie her stomach, savoring the sweet satisfaction.
