Yep I've done it as well, a few years ago I used to drop in to visit my best friends wife while he was at work. At first I would drop in to help with things around the house and garden as I was recovering from an auto accident. One day I got pretty dirty while digging around the garden and Sasha asked if I'd like to shower before I went home.
So I showered and as I was drying off she opened the door to see how I was going and caught a glimpse of my semi erect cock and made the comment that I was almost the same size as Jim her B/F. I jokingly said it can get a lot bigger and said I could show her. She said ok lets see, so she walked in to the bathroom grabbed my cock and started stroking it. It went rock hard she lead me into a spare bedroom where she asked me to lie down. She knelt down started sucking my cock and started fingering her clit. I asked if I could fuck her as I'd always been attracted to her, but she said no as she did feel right about that. She continued to suck my cock and just as I was shooting my load she pulled her head back and shot my lead all over myself.
She kept fingering her clit but never came.
I kept visiting for another few weeks doing the few old jobs around the property and everytime I finished the work Sasha would reward me in the same way.
Then the last time I visited before I went back east to a new job, Sasha knew that I woudn't see her for a very long time so this time instead of sucking my cock she straddled me and rode me until I shot a huge load inside her.
All this happened about 12 years ago, Jim and Sasha broke up about 5 years ago I came back to see her again hoping to start things up again, but Sasha just wanted to be friends. I still see her every now and then and she has told her new guy all about what we did but he doesn't like me dropping over...I suppose I understand.