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I had tried talking to my wife several times about trying swapping but she always very much against it. I had a friend that was usually open for about anything and one day we were having a beer in a bar I brought up the subject of swapping. Mark wasn't married but had a girlfriend that was hot. Mark was mid 20's about my height, 6' and weight, 170. His girlfriend was tall, about 5'9" and around 140 with b cup tits and a nice ass.
As we talked about swapping he said he would be up for it and thought Libby would go along. We decided not to say anything to Libby or Nancy about our idea. A couple of weeks later nancy & I hosted a small party. There were four other couples plus us and Mark and Libby. We were all drinking, smoking pot, listening to music and talking and just having a good time. Around midnight everyone was pretty buzzed and one of the guys there was hitting on Nancy. She was really drunk and loves sex when she's that way so I had to keep an eye on her. I talked to Mark and our plan was to wait until everyone left then make our move but Gary was screwing up our plan by hitting on Nancy.
I saw Nancy going up stairs to use the bathroom and told Mark to go up and wait on her to come out then kiss her. He headed up the stairs but after about 10 minutes him or Nancy hadn't came back down stairs so I went up. No one was in the bathroom but when I opened the bedroom door nancy was on her back with her legs spread and Marked was pumping away. I stood there watching both enjoying the moment and shocked that my wife had been so easy to fuck even though she was drunk. finally Nancy saw me and told Mark they needed to stop. I said yes bad timing. They stopped got up and dressed and we all returned to the party. After the other left we tried to swap but the moment was lost. We did manage to pull it off a couple of weeks later but that's another story.