I've been jerking since I was about 11 yrs old and this time was the scariest and the best one ever.
It was about two weeks ago in my electronics class. We had large benches rather than desks and this really cute boy, with whom I became good friends, sat next to me.
One day, the teacher was gone and he had the class watching a video on Digital Gates and things like that. Well, the boy next to me sat up on the table with his feet on his chair and I was sitting in my seat lighting up a few LEDs that I had hooked together. About 15 minutes into the video, I looked at the boy next to me and I could see up his shorts and boxers. He had a nice fat cut dick that was a little bigger than I would have expected and his balls where just as big.
My heart just about stopped as I could see his package every time the LEDs flashed. My dick was almost instantly hard and I was determined to find a way to jerk.
So while everyone was watching the video, I noticed that nobody was behind me and couldn't see if I started to jerk so...I did. I took my right hand and put it between my legs and rubbed my rock hard dick through my pants and boxers. Needless to say, it only took a couple of minutes before I could feel my dick fill with cum. It took everything I had not to make any noise as I had the most intense orgasm of my life. The sight of his big dick was making me fill my pants with cum. It was so intense that I almost couldnt catch my breath as I was trying to do so quietly.
I sat a couple of minutes soaking in the sight of his dick, trying to remember every little or big detail I could. After that, I went to the rest room, walked into a stall and cleaned up what I could. There was only a small damp area on my pants but I just made sure to cover it in class and by the end it was dry and you couldn't see it.
That was probubly the best session I had EVER had. To this day, I often think about him as I jerk.