I've done this 3 times.
The first time, when we were 22, we went to a sex shop to buy a dildo for her (I was going away for a month to work overseas.) She was wearing a short skirt and a T-shirt with no bra on a dare from me. I was looking at the dildos and she wandered off. Having bought one, I found her talking to an older man in the section that I guess indicated he was into younger women. I waited until she finished talking and we left. In the car she dared me to go back and get his contact details. She made it sound like a prank, but it was very humiliating (and exciting) for me. He had a triumphant smirk as he gave me his card. When we got home she made a show of throwing it in the bin, but of course she retrieved it after I left. She started off sexting and then video calling where she masturbated for him and, finally, she invited him over. She saw him a number of times while I was gone, but stopped the affair when I got back because he was getting too rough.
The next time was a couple of years later in the showers after swimming. The guy next to me had a truly huge cock. He noticed me looking and gave me an aggressive stare. I plucked up my courage and told him my wife had never had a really big cock and I thought she'd love his. I met her in the cafe afterwards and just had time to tell her what I'd done when he came and sat next to us. A few minutes of small talk and he glared at me. I left and as I retreated he said not to come home if the lights were off. It was 4 hours before the lights came on and she said it was the best sex she'd ever had.
The final time she came to my office Christmas party with her Lovense vibrating egg inserted in her pussy. I had the app loaded on my phone and gave her some fun. Late in the evening I gave my boss the phone and told him he could control her with it. Again, I was trembling with fear and excitement, but I knew he wanted her from the looks he gave her and from overheard remarks. That led to a long affair between them.
