I typed this up in response to a comment in Ask Reddit After Dark. I realized I might as well share it here since I already had it typed.
I was not sure how I would feel about it until it actually happened. The night it happened was sort of a swinging experience. My friend, Mark, and his wife, Lisa, were over visiting to BBQ, swim and enjoy the hot tub. I had already gotten permission from my wife, Amy , to play with Lisa and we had done it several times before including MFM threesomes with Mark, Lisa and me.
I was in the swimming pool with Lisa and I was inside of her. I looked over in the hot tub and Mark and Amy were apparently going at it. She was riding on top of him facing him while he was seated. I told Lisa that it looked like they were fucking. The hotness of seeing that made me finish right there inside of Lisa. Lisa said she did not think there were actually doing anything. Earlier in the evening, Mark had taken Amy for a ride in his new sports car an they had cooked up a ruse for me. They decided they would act like they were fucking and let me think they were really doing it. That is indeed what was going on.
The interesting thing was Amy had gotten a little Drunk and lost her inhibitions more than usual and the action of acting like she was fucking was really turning her on. She got super excited and actually came from his cock rubbing her pussy but not inside. She then got off of him and sat down across the hot tub. I got out to see what was going on, I had to see this. When I got there he asked her if they were still faking it. She just grabbed his cock and guided it into her. I asked if they were actually fucking, he confirmed they were. I went and grabbed a camera and took the only picture of Amy fucking another guy that actually exists. I jacked off and came again in no time. After I came again, cooler heads prevailed and I told them they should go into the house and get a condom. Amy was not on birth control.
I went to check on Lisa, she was fine with me going inside to join Mark and Amy. It was an amazing time. I loved watching them fuck. I got my turn also.
That night I realized that I did enjoy watching Amy fuck another guy. Before then, I was never sure if I would lose interest after an orgasm.
Source: reddit.com/r/gonewildstories/comments/9ykxng/my_first_time_watching_my_wife_with_another_man
Nice!