After the first time she caught me, my sister and I were more open about masturbating around each other, though for some reason we were always careful not to watch each other while we did it. One time in particular I remember was when I was 15 and she was 17, right before I got my own room and we stopped being quite so close. We were laying in our beds talking about something normal when I heard her body start moving around under the covers and her voice start getting all breathy. I looked over and sure enough I saw her hand moving between her legs while she talked.
We kept talking about nothing (actually I think we were talking about strategies for a fantasy board game we both liked), then I heard her kick off the covers and roll over. I turned my head and saw she was laying there on her stomach rhythmically humping her hand up and down while she talked in the same breathy uneven voice about how useful a Berserker would be against a Witch-King. I could see the bottom half of her ass poking out from under her T shirt. That didn’t turn me on (she was my sister, after all), but the sight of her hand rubbing her wet pussy closer and closer to orgasm definitely did. Safely covered up by my blankets, I reached down and started rubbing my own pussy under my panties.
By this point the conversation had pretty much died out. After a couple minutes she said in a low almost desperate voice, “Hang on, I’m gonna cum.” Then she moaned quietly, her legs clamped shut around her hand and her whole body started shaking as she came super hard. Of course that set me off too and I came with a somewhat louder moan as I felt my hot wet orgasm ripple through my whole body.
After that she turned out the lights and we just went to sleep. That was the last time we did anything together for several years because I got my own room soon after but every once in a while in the privacy of my own bedroom I would rub off to the memory of that night.
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