My SO has been wanting me to have sex with another guy that has a much bigger dick. (Like 10-12). Anyway he brought a friend over and I thought he was good looking, but I just thought he was his friend. Anyway the two go to another room and the friend comes back with no pants on and he’s massive down there. I was just sitting on the couch like wtf... and he sat down right next to me and put hand on his junk. I got up and honestly I don’t know what to do right now. My SO really wants this. I’m unsure, and I hate to disappoint the guy because he was promised sex and hate to disappoint my SO. I just don’t know... should I leave, stay, have sex with him to make them both happy?