Who said classes are boring?
Some time ago, when I was fifteen, I was in a Computer Ed. class. It was first period, and I hadn't wanked that morning. I was sitting between two guys, doing whatever we had to do. I eventually started to get hard from the comfy position I was sitting in. My cock grew hard, straining against the top of my right pant leg. I was suddenly glad for the soft material of our school uniform as I began to stroke 'him'.
At first I was cautious, just sinking a little in my chair and resting my left hand on my right leg whilst carrying on the pretence of normal work. The layout of the room meant that we were in a corner, facing in to the room, whilst others were sat on the other side of the desk. Basically, I could only be seen by the guys either side of me.
I gradually got more daring, gripping my head, half sheathed in foreskin, through my pant leg. I started rubbing the foreskin up over the end, using a grip something like opening a door handle. I was rubbing very slowly, but the situation was making it an awesome experience. I gradually picked up the pace until I neared the end, imagining the result if the guys either side had seen me.
I felt it building and building, whilst I wondered whether I should stop. Well, guess which head I was thinking with; I shot in my pants, spasming a little from the intensity of the orgasm and my now super-sensitive head rubbing against my pants. I glanced either side of me, no one had noticed.
The only real downside to the whole experience was the speed at which cum cools. Unfortunately, it's nowhere near as good as when it's warm then.