The one time I cheated was on a girl in high school. She was cute, had a bubble butt, decent tits, couldn't ask for more. When we had sex though, I could never cum, and found I really just wanted to eat her all out and for her to take charge.

My best friend at the time was having a different issue, and told me one day about it, how his dick was so big his girlfriend wouldn't have sex with him. Hearing him say that turned me on more than I had ever been turned on in my life, which was strange since up until then I had never even remotely thought of guys in a sexual way, though I guess my submissiveness may have been a prelude to it.

After asking to see how big his really was, and telling him I doubted it was as big as he described, he pulled down his pants and asked if I wanted to suck it in a jokingly manner. It was huge, but I said no just out of nervousness and laughed while I starred at it. He told me to show him mine, and I did, and he laughed at how small it was, and that I was hard. My dick was so hard I felt like I was going to cum almost instantly, and his dick looked so hot, I held it, and asked if he really wanted me to suck it. He gave me the okay, and so I started.. until he came, and stroked it shooting his cum on my face. I came while giving him a blowjob.

Hottest experience I've had still. I broke up with her shortly after.