This is based on a true story.
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I had never masturbated in the room before. I had always been so careful; whenever I really HAD to touch myself, I did it in the shower. But this night was different. I kept thinking about him and I got so horny that I couldn't sleep.
I looked to my right, at my dozing roommate, who appeared to be sound asleep. Her slender form was motionless. It was good enough for me. I had his image in my mind, and I slipped my hand slowly down my taut stomach and into my clean shaven pussy. I started slowly at first, savoring the slick, smooth skin beneath my fingertips. I was trying so hard to be quiet, and I was succeeding. My breathing, a little heavier than normal, was the only thing that was different.
And it felt so wrong. Touching myself with someone else in the room. I justified it by telling myself that it didn't matter; we weren't friends, anyway. In fact, we barely talked to each other, save the bare necessities. It was like the other didn't exist.
I made small circles on my clit now, and I gasped softly. I almost brought my other hand up to cover my mouth, but it had made its way to my breast, softly stroking my erect nipple. It had been less than two minutes, but already I was about to cum. I grasped my clit between my two fingers and furiously brought myself over the edge -- my bed started to shake and my breathing was ragged. My body quivered from the aftershocks of my orgasm and I continued to stroke myself, more lightly now, as my breathing died down.
And just then, I heard a curious noise coming from the other side of the room. At first I thought my roommate was having a bad dream, and kicking her sheets. But the rustling of the sheets came at regular intervals, and certainly wasn't a fearful or angry. Fear flooded through my veins as I first heard her, but I didn't stop masturbating. The noise continued; it was like a moving of sheets, every three-quarters of a second, and it took about twenty seconds for me to realize what was going on. She was masturbating to me masturbating.
Intense arousal pulsed through me, and my clit began throbbing like mad. I hadn't been this turned on in a long time. I continued touching myself, slowly, cautiously, unsure of where this was going to end up. I didn't look to my right; I was too afraid that we might make eye contact if she was looking my way. It was hard to not be pushed over the edge as I listened to her, and soon enough I was. I slipped a single finger inside of myself and felt my muscles contract as I came, and my bed shook once more. She stopped making noise soon after. I don't think she orgasmed, and I wondered how she could go to sleep after that. I didn't have much time to think about that, though, because I was exhausted from the exertion and soon drifted off.
I didn't think about it much for the next few days, but there was a definite tension in the room that wasn't there before. We went about our daily business, ignoring each other as usual. It wasn't that we hated each other, we got along fine in terms of being roommates, but we just had our separate lives. We were both very attractive, very fit girls, and I think there was an unspoken competition between us, as there seems to always be between myself and other attractive girls. We were also both competitive by nature, her being on the volleyball team and me being on the school's tennis team. We could have become good friends, I'm sure, but instead we chose to ignore each other.
In the meantime, I was getting farther and farther with the guy I had been lusting after, and I was in a relatively good mood. We hadn't done anything physical, but we both knew it was on the horizon. I thought about him again that night as I lay in bed.
You wouldn't believe it, but the exact same situation happened again. Now I knew for a fact that she was doing what I thought she was doing. To be honest, it was hot as hell.