On my couch in my old apartment. I was banging my wife's sister on the couch while my wife was on the balcony. We had a large window to the balcony. I just watched the wife's shadow while we went at it.
Second time was the wife's sister again, on my couch, while the wife was asleep in our bed. Banged her that night, the sister stayed the night, then the next morning my wife left for work and the little sister came in the bedroom and gave me head.
Third time, wife's friend came over. The wife was showering so the "friend" and I went at it in the next room. I just listened for the shower to stop as an alarm.
The same friend was at softball tournament we were at. We met at in the family restroom and got a quickie in while my wife and the "friend's" husband watched the game. Of course, they were watching different games, lol.
Yes, stupid, but it was a rush each time.