This is a true story that happened to me when I was 13 years old. One day in gym class we were doing pullups, when it was my turn I started out good until I got half way through a set of twelve, then I started to feel this tingling feeling building up in my stomach.
Then it reached the head of my penis and then it was so intense I could not hang on anymore, so I stopped and started to walk away so the next kid could start. I didn't get that far, then all of a sudden I got weak in my knees and at that point I fell to my knees then I had the most powerful orgasm right in front of the whole class. I just kept cumming and cumming right in my shiny royal blue nylon shorts!
I didn't think it was going to stop, then when it finally did I had to have the teacher help me up! There was so much cum it soaked right through my briefs and leaked down my leg. At that point my face was so red with embarrassment, the whole class was pointing and laughing, then the teacher smiled and said that it just happens.
I just walked away with a giant wet spot in my shorts. I now think about that day 25 years ago everytime I see shiny nylon shorts I get HARD!!! Now I have a nylon fetish thanks to that day!