Once while I was at a concert, the girl next to me, who I didn't know, was dancing, and swinging her arms. She started to get really close to me, and bumping into me. She was doing it in a playful way, and when I looked at her, she just smiled. I started doing the same thing, and she smiled all the more. The next thing I knew, she was rubbing her hand against my crotch. I was wearing loose fitting jeans, with no underwear, and it really felt good. I even started to get an erection. I started fondling her tits. We were surrounded by people who were all standing at their seats and dancing. It was kind of a turn on to have her hand on my dick, with all those people around us.
This went on for a few minutes, and she started to unzip my pants. I couldn't believe it was happening. I reached up her shirt and unhooked her bra, and slipped my hand underneath it. Her nipples were so hard, and by this time, so was my dick.
Next she reaches her hand inside my fly, and starts jacking me off, right there on the spot. I was a little afraid of getting caught, but I wasn't going to tell her to stop. It was unbelievable. After several minutes, I came all over the place. I don't know if anyone was watching us. I imagine that a lot of people were paying attention to the music, but knowing they could see me was unbelievable. It was the most exciting and frightening thing that's ever happened to me.