My Roommates Boyfriend

I "walked in" on my roommate's boyfriend going to town on himself watching porn.
I knew he stays over but I normally leave for work much earlier than them. I had no idea he stuck around.
I woke up and walked into the living area looked up and he was alone jerking off so hard. We were both totally shocked. He tried to cover but I told him to keep going I was OK with it.
I sat right beside him on couch, watched, and cheered him on to cum. I didn't do it for I just let him look at me get up close to his dick, even put my face right down there and talked filthy to him until he popped.
I am not sure why I did it ... but it was fun and loved how awkward it made him afterwards. He was worried I'd tell. He cummed all over himself and tried to explain his actions... I laughed at him an left him like that.