18 when it happened
When I was in my first year at Uni, we were given a big project to do, which meant I was spending a lot of time in the library. I'd often stay with my friends to work on it until around 9pm.
One night I was working alone, I had been feeling horny all day, my mind soon wandered away from doing work, and instead I started to imagine my hand inside my silky thong rubbing my clit and my fingers sliding in and out of my tight pussy. I was wearing a short denim skirt, and there weren't any people around, so I began to tease my hard nipples through my skimpy top. I couldn't help moaning softly as my clit hardened and my pussy began to throb. I couldn't take anymore, I left my work and went into the nearest toilet, went into the cubicle and took my bra off so I could massage my 34E tits and rub my hardened nipples. I lifted my skirt up around my hips and pulled my soaked thong off.
I sat down on the seat with my legs spead wide apart, I began to massage and rub my throbbing clit. I love stroking my pussy, it's shaved so it feels really smooth.
After a few seconds of rubbing my clit, I slid two fingers straight up into my tight pussy and began fucking myself really hard. At the same time I rubbed my clit hard and fast, moaning louder and louder, I was totally alone, but that small risk of getting caught was a massive turn on. I came in minutes, all over my fingers.
I haven't been alone in the library since, but I have found myself alone in the car, on a train and in a pub toilet.