(Note: I apologise if this isn�t the right format for this sub, this is my first time posting here)
A couple years ago I was friends with a girl who was also pretty slutty. A large part of our friendship was talking to each other about sex, what we were into, recent fucks, what we didn�t like in bed etc. She was in a long term, but open, relationship with a guy. They�d agreed between them that fucking other people was ok, and it seemed like it was working out well for them.
At some point her bf and I were chatting and he mentioned that she never let him fuck her ass. I knew their relationship was open so I (mostly jokingly) offered to him that if he ever really wanted to take some girl�s ass he should hmu and I�d do it.
A couple weeks later I got a text from him asking if I was free and could he come over. I said sure, and about half an hour later he was sitting in my kitchen with me. We briefly exchanged smalltalk and then he asked me if I�d been serious about my comment before about how I�d let him fuck me.