I came home from work early the other night and caught my wife in bed with one of her girlfriends. It is one of my best friends wife. When i walked in they were surprised and my wife was a little nervous i was going to get mad. We have talked about her being with another woman but the stipulation was i was there. I told her i was ok with this if i could watch them. My friends wife did not want to continue with me watching until i reminded her her husband did not know they were doing this either and i would tell him. Yes a little friendly blackmail. As i watched i started to get undressed and they told me that they just wanted it to be them. I agreed and just told them i was going to jo while i watched. they fucked each other for about an hour and i ended up cumming a couple of times. After her friend left i asked her if she liked it. She did. we talked and she agreed to do it again and let me be involved if we could also have a 3sum with another guy. I think she thought i would say no but what she doesn't know is i have had a fantasy for a long time of watching her get fucked by another man with a big cock. I will let you know how it goes.