Out of nowhere, I found out I feel turned on by thinking of my ex seeing me with another girl and crying while she watches me have sex with this other girl. Actually, this is an idea I had priorly. Sometimes while having sex with my ex, I imagined myself having sex with another female and my ex watching and suffering. I just found this subreddit to learn more about this desire that was born in me. Is this a fetish? Or just a fantasy? Why do I, as a male feel, pleasure by thinking I am "cheating" on my girl while she watches? I also like to think about my imaginary girlfriend being dominated by this imaginary other girl. Can you girls/guys get me more in-depth with this feeling?