Guest or housemate masturbating while you have sex in front of them

Has anyone here been in this scenario? What all happened?

Sorry to let you down. I have never even been close to your scenario.

Sorry but I shall follow with interest

I have. I was the guest. My best friend and his wife wanted me to watch them having sex. They wanted me to stand in the doorway and masturbate. I did, but I stood “too far away”. So a second time I came right up to their bed. I am not into threesomes but again I obliged. She wanted to fondle my hard cock while he fucked her. I was hard, but I felt very awkward. Not my scene!! There was a third time where, without clearing it with me in advance, my friend went off with another woman to one part of the house, leaving me alone with his wife in another part of the house. There was nothing for it but to do the gentlemanly thing and take her upstairs and make love to her. Which I did. She is very good looking but that scenario just felt awkward to me. My wife didn’t/doesn’t know about it. I’ve never looked back and fantasized about it either. I just felt like I was doing the right thing by my friend and not creating some awkward scene by refusing to fuck his wife. Yes, she came and I came. A good time was had by all. But I really felt put on the spot.

Such problems to have, right? There have been no further scenes like these since then, 15-20 years ago while I was their guest in three places far from my own home.