Years ago, I set up a fake 'MSN' account, and managed to add my then Stepdau......she actually went on her webcam and masturbated naked in her computer chair for me.....I travelled a lot for work, and would chat with her when I was at a Hotel......I even showed her my erection, hiding who I was of course, and she would masturbate as I jerked off for her on a hotel bed.....
I used to get hard in my pants from the vibrations of the bus in my teens and it was still hard when i got off. I can imagine how you must have felt having an orgasm at that age.
We had a computer lab at school, with individual partitioned cubicles....I sometimes got myself off by crossing my legs and clenching and rocking discreetly in my chair.....I also did it on the schoolbus on my way home, sitting at the rear of the bus so the vibrations from the engine made my pussy throb and tingle....I had to be quiet, but it felt wonderful to reach an orgasm in public like that...