I went out with the guys the other night and I came home a little buzzed. I saw my wife asleep on the couch so I stripped my clothes off and snuck in under the blankets. I reached around and started rubbing her tits and shoved my hard dick up against her ass and then realized this was not my wife. It turns out, her best friend was having her apartment painted and was staying the night. Well, she turned over and was about as shocked as I was but she asked me in a playful way. What are you doing? and then she grabbed my dick. Well my first thought was yippee, but then I pulled away and told her I thought she was my wife. I immediately took a shower and went to bed but the question remains......what should I have done. I should say that I realize I am married, but I have had a threesome with this girl and my wife in the past, but I have never had sex with her without my wife.