My ex girlfriend and I used to fantasize about how she was cheating on me with her boss. After about a year of confessing my fetish to her she started dressing sluttier at work. This became a fun game. She worked in the back of a pizza place so there was no dress code. She would come home from work and always work late. When I discovered she had been cheating on me with him I was angry and hurt, but whenever I jerk off it's still all I can think about. When I expressed my emotion she would easily and often cripple me by using the lingo in our fight that we had used in bed. "So what if I was letting him cum in me! YOU SAID you wanted me to enjoy a bigger cock." She also reminded me that while I like slow sex he fit her style more of rough and sweaty. More forceful and assertive with her. I still talk to her to this day sometimes about it and we both get excited. She also visits he and I separately whenever she's in town.