Ex girlfriend wanted to do another guy

my ex wanted to do it with another guy. So after months of fantasy talking i reluctantly agreed under the impression that i would get to pick who where and when (if ever) this happened. About a week after agreeing my friend was at our apartment and she kept flirting with him and being very short and bossy with me, which put me in a bad mood. Anyway, we were all three pretty drunk and my girlfriend surprised us by telling us she had scored some coke and as soon as we done a few lines started asking him how big he was and wanted us to compare size. I knew where it was going and said no as she went over and took his pants down and gasped over the size.

I was so jealous and humiliated hearing her compliment my best friend on how huge he was and how eager she was to go down on him with me watching since she hardly ever did that for me. She kept telling him she wanted it inside her until he finally stood up and pushed her down right next to me on the couch and forced his penis inside her making her squeal and plead for him to slow down, at first, then within a few minuted she was moaning and obviosly getting an orgasm like she never had with me before!

it was humiliating but I've never been so turned on as I was watching her with another guy! I could tell when he came inside her. His leg was quivering, as he stopped moving inside her. I knew that this was the beginning of a new relationship. A couple of weeks later she moved out and into his place.