I was 14 at the time
I found a back massager my parents had a few years ago and I touched it on my dick for a second and it felt pretty good. So I decided to hold it there and I got very hard and it was very tingly. It was a massager that had two balls that vibrates about an inch apart, so I took all my clothes off and laid down on top of it with my dick in between the balls and turned it on high.
It immediately was very tingly and I was squirming aound a lot on it. I could slowly feel the orgasm building up and finally after just a few minutes I cummed a lot. It was hard to keep my dick on it because the feeling was so good. I am getting so hard thinking about this right now. I think I'm gonna go jackoff.