Around midnight my wife's boyfriend msged that he's super horny and if she's up for a quickie. We were already in bed but i could tell she would like it. As i wasn't in the mood to participate I said you can fool around in the guest room. So we agreed to it and he would be here in 20 or so mins. While we waited i stripped her naked and went down on her for a bit. When he arrived i got her to open the door naked (something she's never done before). The front door is next to the bedroom so i figured i would hear them say hello and move into the guest room. Instead i hear the door open, him saying fuck you look fine and they start making out on the front door. I have never been this worried and turned on at the same time. Worried that someone would see my very naked wife making out with someone and turned on thinking my very naked wife and making out naked on our front door. After a minute or two i heard them take a few steps inside but i didn't hear the door close. What i hear instead is pants coming off and the start of a very sloppy blowjob. I really wanted to peak but held off. After a bit i hear some moving around and they start moaning. His dick was not in her mouth anymore. I almost cum imagining my wife fucking her boyfriend with the front door open. After he left i looked at the clock and the whole thing probably lasted only 7 or 8 mins but fealt like hours. Wife walks in the bedroom with cum in her pussy, my dick in my hand. I cum in 10 secs.