FWB finished in me after fucking his girlfriend at my place [FM]

I am in a Friends with Benefits understanding with one of my colleagues (Let us call him Tom). He is an athlete, has a very lean body. He recently got in a long distance relationship with his childhood crush (Let us call her Ana). Thank god for the long distance, as I continue enjoying the benefits :)

Tom stays with his mother, as she is old and he has to take care of her. He did not have a place when Ana planned to come over to our city the first time, and he did not want to spend on a hotel. I stay alone in my apartment. He asked me if they could use my place. I of course accepted, I can’t say no to him, but I had my conditions. Only I deserve his cum throughout their stay at my place. And if he cums in Ana, he has to fuck me in front of her. This will be fun, as Ana had no idea about Tom and me and our understanding.