I'm interested in watching my girlfriend have sex with another man. She is interested and excited too. Can you please provide a detailed erotic story about this kind of scenario?

My name is NAME_1 (male) and my girlfriend's name is NAME_2 (female). She meets someone (a man) at bunkers bar in Minneapolis, Minnesota and takes him back to our hotel. I only watch. Please describe between her and the man in detail in your story. NAME_2 is submissive in the bedroom and likes to be treated like a slut.  She loves rough sex and part of the scenario should include the other man fucking her from behind.
