When my wife, 'Mary', and I were married for a few years we had a friend, 'Joe', visit us for the weekend. He was our best man and we both knew him since we were teenagers, me from high school and her from the same teenage job in fast food. He was divorced or separated at the time from his first wife. He found out she was cheating at the time. They tried to stay together and he used the guilt to get her to swing a little. (Yeah, I know pretty stupid)
On this occasion we were sitting around having a few drinks and talking. His swinging stories became the topic of conversation. My wife has always been pretty conservative sexually and usually didn't want to discuss things like this. It was summer and she was wearing this little one piece outfit that were shorts but looked like a skirt. As the stories went on and the drinks flowed, I could tell she was getting excited. On one of her trips to the bathroom, she actually took off her panties. I was sitting next to her and started sliding my hand up her leg and could feel her pussy getting wet.
At one point her and I went into the kitchen and I started making out with her. I suggested we let Joe join us in the bedroom that night. She didn't say no but she wouldn't say yes either. I always thought she definitely was considering it.
We finally went to bed, without my friend and of course had sex. I even tried again there to ask but she was too afraid it would affect our long term relationship. My friend later told me our door wasn't fully closed and he watched for a while.
I often wonder if I had just suggested that she give him a handjob or bj she might have been willing to do that and then things could have progressed from there. Or what she would have done if my friend had just walked into the bedroom and approached her.
Overall though I really can't complain. We have been happily married over 25 years have great kids. My friend is on wife number 4 and miserable. It may have been a fun night but if it screwed everything else up, it definitely would not have been worth it. It has still fueled my fantasies at times.
