First of all, sorry for my english, it’s not my native language. Also, this is a long story.
This happened a while ago. Both of them are my friends (same social group), he went to collage with me and I introduced his current wife (the one I fucked) , she was a close friend of mine. ( I will call her E)
I met E at a party and she flirted with me, at that point she had a different boyfriend and I wasn’t interested in her, we turned into close friends, I was single and I would talk about almost everything with her, about girls, or who we liked, we would go to parties together and people thought we were dating. We never kissed or did anything sexual, but we would get drunk and dance closely, flirt, spoon on the couch and I even spent nights at her house but not on the same bed. Nothing too crazy but I knew that she liked me a lot, and one night at a party she told me that she wanted to fuck me and I told her that it will never happen (in a nice way), she told me that it will, I wasn’t really attractive to her and I’ve been always really selective about who I’m going to fuck. Basically I frienzoned her.