OK so, I am about 6'3, 200lbs. Not that it matters for this story, but anyhow.
I was probably about 13. I was at one of my older sister's basketball scrimmages. She was in high school, and I was in a state of 'changes'. I remember the gym they were in had an overlook of some kind, sort of like a balcony. I was watching from up there. I was sitting there being bored, when all of a sudden I had a boner. Now me being a young kid, seeing a whole bunch of good looking girls running around in sports bras playing basketball, there is no surprise about what had me excited. But I didn't want to have a boner (as I called it back then) in the middle of a public school.
So I decided to walk around and try to find some place to sit. First I tried to go to the restrooms, but there was someone in it. I then remembered that there were locker rooms. I found my way to the guys locker rooms, but to my surprise, I found them locked. I had to find somewhere, because my boner would not go away. I thought what the heck, I'll go to the ladies locker room.
I went in, and sat down on a bench in the corner. Now since I was so young, I had no idea what masturbation was, or even how to to it. All I wanted to do was sit there and let it go away. Boy that wasn't going to happen anytime soon. As I was sitting there, a swimmer came out of the shower completely naked. She had to have been about 17. I remember it like it was yesterday. She had a towel around her head, and nothing else. Her firm looking breasts were beautiful, and her nipples were erect. Then I lowered my eyes to her bare pussy. I almost exploded right there. Since I was in the corner, she hadn't noticed me. She bent over to pick something out of her bag, and gave me a wonderful look at her ass and pussy. She then returned to the shower. Needless to say, I left as fast as possible.
However I still had my problem, which was magnified by like ten. I still had a huge boner (huge for a thirteen year old). I wanted to get rid of it, so I went outside, I was sitting on a wall outside when this first happened. For some reason I had a powerful urge to pull out my penis and look at it. So I did. I pulled out my penis right next to a public school. I can remember that it was so hard. When I pulled it out, I got a somewhat tingly feeling. I started to squeeze and fondle my boner. I was all of a sudden in another world. I squeezed it for a little more and found that when I jerked it back and forth it felt the BEST. I didn't last more that thirty seconds. I started to shake and quiver, I wanted to stop, but it was like my hand had a mind of it's own. I jacked as fast as I could.
Then it happened. an overwhelming surge of pleasure shot over me and I came, right there in my pants next to a school.
It took me a good couple of minutes to calm down and once I did, I felt as if my eyes were suddenly open to another world of pleasure. It was mind 'blowing'