Oh, let me count the ways:

Public Places: When I was a teeanger, I was able to autofellate. That was pretty damn good by itself. Then I got addicted to it, was at after school swimming at the pool. I got turned on by a friend of mine, went to the bathroom and went to town on my dick. Was at it a while, teacher came looking for me. I didn't stop as she asked me if I was okay, I just mmmmphmmed around my dick. She stuck around and kept asking me questions, and I blew the biggest load because she was there.

Exhibitionism: My first real girlfriend and I were talking over MSN messnger one day. I was home alone, she was home alone. I had a webcam but she didn't. So I put on a show for her. I didn't mind that I couldn't see her because her comments and encouragement were enough. And it has exploded from there.

Jerk off Humiliation/Ignored/Yelling: The same first girlfriend came around between classes and we were fooling around. We lost track of time and she had to leave, so she started getting dressed while I kept jerking off. She was laughing at me, told me I was a pervert and went to leave... except that she didn't. She got out into the hallway and then came back with a kind of eager but annoyed look. She opened her shirt back up for me and I beat it like crazy.

It was maybe two minutes later and I still hadn't cum. She started get really annoyed, saying stuff like "I haven't got all day PMmeyourblowjobpics" and tapping her foot impatiently. A few minutes and still nothing. She went to leave and I weakly asked her to stop. She turned around and yelled at me "Goddamnit PMmeyourblowjobpics, cum already! Cum! Cum! Cum!". And holy shit, did I cum.