15 at the time
So when I was 15, I went through this swimming craze, trying to get fit and stuff. This was an interesting time as I was hornier than ever and had just discovered that I was an exhibitionist.
So anyway, I would go down to the local pool, jump into the pool, do some laps and then I would head to the locker room. This was the best part of the whole experience. The showers were all lined up in one room, just like you'd find in prison or like at a gym. Anyway as soon as I took my swimmers off, I got this huge erection. It was pretty late at night so it didn't matter so I jumped into the shower and started jerking off straight away.
After a while I got bored of this and I thought to myself it would be cool to sneak into the girls locker room and jerk off in there...I wasn't a pervert or anything, I just liked jerking off in weird places. So I snuck in, and the girls showers were empty luckily. And then I noticed them, a pair of pink panties sitting on top of a pile of clothes near the lockers. I grabbed them and sniffed them...they smelt great. I proceeded to jerk myself off with them and cum all over the floor of the womens showers.