I came home from work early one day and saw a strange car in the driveway. This was not all that unusual, ever since my wife left work to take care of our baby she has friends over quite often, but I didn't recognise the car and that was a little unusual. I walked in the front door and assumed that my wife and whoever was visiting must have gone out since they weren't in the living room where she always entertains. I was just about to turn on the TV and wait for them to return when I heard a sound from upstairs in the bedroom.
I walked up the stairs and saw the bedroom door wide open, on our bed my wife was naked bouncing up and down on some guy's cock. My cock instantly jumped to attention, we had often talked about the possibility of my wife fucking someone else but she had never actually done it as of yet. I sat there out of view of both of them watching and stroking my cock. I saw that the guy she was fucking had a slightly longer but thinner cock than me, and he was uncircumcised.
My wife moaned loudly and said "Fuck me with that monster cock of yours." He groaned and proceeded to fuck her harder. "My husband will be home soon to join us, I'll suck his cock while you fuck me again, then you can watch him clean all your cum out of my pussy." This was too much for me, I got up removed my cloths, walked in the room and said, "Not soon now. Suck my dick slut." My wife was startled, and so was the guy, who I now saw was an old boyfriend of hers Fred. My wife smiled and grabbed my dick and swallowed it. Fred who obviously now saw that I was ok with this began fucking my wife in earnest again. My wife came releasing my dick long enough to scream. As soon as she came down she wanted to switch positions. We were both amiable since we just wanted to get off by now.