Obviously last girlfriend watched her cum when fucking her.A few months ago, one of my wife’s friends came to camp with us. You can hear everything in a camper trailer. I have insomnia, and I know she doesn’t realize.
My wife was snoring. So I am sure she thought we were both asleep. I heard rhythmic rustling, then faster rhythmic rustling and heavy breathing and some gasps, then full stop and a long exhale. She was trying to be discreet and if I had been asleep, there’s no way I would have heard her.
It was so hot. I think about it all the time. I jerked off quietly in the trailer’s bathroom because I couldn’t get it out of my mind, but I am pretty certain she was sleeping when I did it.
If the OP meant watching others besides your girl, how about watching an ex give an intense hj to another man resulting in an explosive cumshot.