One Saturday morning my parents were out, leaving me and my sister alone in the house. I walked down the hall to the bathroom and as I passed my sisters room I glanced in. She was lying on her bed on top of her duvet facing away from me. Her nightie had ridden up exposing her bum. She had just turned 13 and was now wearing little thong panties and as I stared at her I began to get hard looking at her cute ass. Then I noticed she was slowly grinding herself into her duvet, I could just make out her bum flexing and I was now quite horny. My cock was twitching in my boxers as I snuck a look at my sister. Next thing she lifted her thigh and balled up the duvet between her legs and slid her hand under her front then she began to thrust into the duvet, squeezing her thighs around it, every so often she would lift her bum up and I could make out her hand rubbing between her legs, then back to humping the duvet. I slipped my hand into my boxers and squeezed my rock hard cock as I watched her. The little piece of material riding the crack of her bum, speeding up I could just hear her gasping and then she gripped the duvet and juddered to orgasm, just as I was coming she flipped her thighs open and I had a perfect view of her pussy and the wet scrap of thong panty stuck to her sweet swollen lips, as I shot strings of jizz into my boxers I stared at her sex bulging out of her panties. Later that day I took her soiled thong and beat myself off into the sticky damp crotch thinking of her cumming in them.
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