Wife and personal trainer
My wife and I had an understanding that if she fooled around she would tell me what happened. She was with her personal trainer who was a little younger built guy who was in the middle of a divorce. He had her doing squats or something and when she was down was eye level with his crotch, her mind started wandering and moved enough so her face touched him when she came up. After a couple times he smiled and asked what she was doing. She smiled and said it looked nice and she couldn’t resist. Before long his bulge was growing and he asked if she wanted to see where he was staying which was a room in his studio with an air mattres bed so once in there it didn’t take long for her to get his shorts down and sucking his cock. She said it grew to 7 or 8 inches and she wanted it. They had sex in a few different positions before he exploded inside her. She got dressed and left before his next client arrived and came home to tell me. I was horny as hell by then and slipped into her still wet pussy. They had a couple more sessions until he found a new girlfriend and it ended but sex for us was great after each encounter