Masturbating in the library

When I was studying my A levels, so was about 17/18 I used to go the the library to study in peace. They had private study rooms that you could book out. The thing is that when I have to do something quite boring, even to this day, my mind seems to distract me from the task by getting me horny. Even now I break off from housework or other boring tasks to masturbate. As a horny, single teen, I masturbated a lot, but I'd never done it in a public place. As my days there were often long and boring, I started to get myself off in the quiet room. It was a basic room with a desk, a chair and a crap computer with a small square window in the middle of the door, probably at head height if you were sitting down. I did it a LOT but two specific memories come to mind. The first one, obviously. I remember going out for a sandwich and it was a hot day and I felt really horny. I was thinking I would masturbate when I got home and then when I got back to the study room I thought I couldn't wait as I was actually wet and might go to the toilets to get off. Then the thought occurred, the way those daring, naughty ones do, with rising excitement in my tummy and between my legs. Why not do it here? So i started to gently brush my nipples and I was getting so wet that, with one eye on the door, I slipped my hand up my short skirt, into my knickers, and started to touch myself. The first touch on my clit was electric and with one eye on the door, I vigorously rubbed it in quick circles until, in less than a minute, I came on my hand. I remember feeling mortified that I had done it in a public place, but not ashamed enough not to do it again the next say and several more after that. The second memory is when I got even more daring one day. I was well used to sneaking a hand in my panties and making myself come there by now, but I guess I wanted more excitement. So after teasing my boobs and clitoris slyly for ages, I decided to take things further. I slipped my skirt and knickers down to my knees, then right off. I still remember the vivid sight of my exposed pubes and pussy in the little study. And still I went further, taking off my T-shirt and then, finally, my bra. I was naked apart from my trainers and lay down on the floor to avoid being seen. Lying there I ran my hands all over my body, especially my tits, then between my legs. I was so fucking wet! I rubbed my slit gently then started to finger fuck myself lying on the floor. Again I came quite quickly, I think this time with a barely stifled moan. I can still remember rubbing myself and looking up at the little window as I did, but to the very best of my knowledge nobody saw me. I did it lots of other times and in some other public places after that but that was the only time I got naked (well, almost naked!)