So this happened when my gf and I were having sex back at her place. We have been seeing each other for almost 5 months now. I am her 4th boyfriend. She has been with more guys than me and we are open about it. I know everything about her past, not all the specifics but who she has been with, who she has had sex with and stuff. I know everyone she has fucked.
So this time one evening, we were quite intimate doing close missionary, I was deep inside her while we were making out. Suddenly, I got a thought – “how many guys has she fucked on this same bed before me? how was it?”. The thought of many guys fucking my girl in the same bed where i was on right now before me made me so horny. I popped her the question. She looked me in my eyes and smiled. It was a sexy sly slutty smile that really drove me crazy.