I took my two mates back to my house for a drink.When we arrived home my wife was just going to bed. When she opened the door for us she was wearing a very short black nighty and black nickers.She is about 5' 3" and with a body to die for and full pouting red lips with a fabulous arse..I could see my mates eyes as we came through the door ,this turned me on..We all sat down for a chat and my wife went into the kitchen to make coffee..She brought the coffee back and was teasing my mates by bending over to show her perfect arse and great tits. I decided to go out on my own to get a take-away. By this time i had an erection nearly poking through my pants..About twenty minutes had passed and i returned, making sure that i didn't make a sound as i opened the front door..The light in the lounge was still lit but nobody was around..Had my mates left and my wife gone to bed ?.I crept up the stairs to our bedroom with my mind running riot thinking what i would find.(We had allways talked about this kind of thing but had never done it before). When i got to our bedroom the door was only slightly ajar but i could see perfectly without them seeing me. The sight that i saw nearly blew my mind. It was like having a front seat to my own private porn show with my horny slut of a wife being the star..One of my mates was lying on the bed with his feet on the floor and my wife was standing bent forward over him and giving him the blow job of his life.My other mate was behind fucking her hard..The only sounds that i could hear was a little moan my wife made in between sucking and the sound of flesh against flesh as my mate fucked her from behind..I didn't make a sound as i wasn't going to spoil this for anything..My wife seemed to be directing the show. Did she know i was by the door or didn't she give a shit..The next thing i saw some them change to another position.One mate lay fully on the bed on his back and my wife mounted him,then she directed my other mate to fuck her up the arse from behind.She gave a little cry as my mate entered her arse and started pumping gently..After a few minutes she started to have an orgasm and shook like she was being eletrocuted..After her orgasm my mates pulled their cocks out of her and she grabbed both of their cocks and wanked and sucked them until cum was squirting out over her face and tits,rubbing the cum on her face with their cocks.. I was nearly cumming in my pants at this time.. I decided to make a quick quiet exit and came back an hour later.She was fast asleep and my mates were gone. I didn't wake her up, but the day we had some great sex..I think we must do that again ,only this time i will join in..