A Cuckold is Made -- One Man's Story:

This was posted  years ago on a forum that is now defunct. But its lessons remain relevant today.
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Spotting the Competition ...

Bill had always shown an interest in my wife--even before I was into the Hot Wife thing.

My wife and I were visiting her cousin in Salt Lake. While we were there, her cousin's husband, Bill, and I went to the YMCA to play some racquet ball. As size goes, I’m near average length but am well on the thin side of the ledger (I’m at the bottom 20% according to the "definitive penis survey"). That’s especially so after I exercise. At that time, I have a very small flaccid penis.

After play, we hit the men’s hot tub. As I got in the tub, Bill got that "cat that swallowed the canary" smile. As I say, he was always interested in my wife. But once he saw my tiny pecker, he pursued her very aggressively! I honestly think that as soon as he saw it, Bill knew that my wife was his for the taking. I say so because he made his play right away. In fact, he was so confident that he put the moves on her that very night.

Your wife is the prize. He sizes up the competition. You!

We spent that evening watching a couple of movies. Bill did things like pulling her down on his lap when she walked past him. In fact she sat on his lap for one whole movie. Every time she got up to do something, she would return right to his lap. At the time, both his wife and I thought this was innocent flirting. But I learned later that she was stealing touches of him the whole night. That was when and how my wife found out Bill has a very thick cock.

Conveniently, my in-laws lived in Scottsdale, and my wife decided that she had to try on Bill's thick cock for size. It ended up that Bill had several sessions fucking my wife over about a three week period when he was doing some business traveling to Phoenix. She thought she was going to keep me from finding out, but Bill confessed to her cousin. That caused a divorce between them.

I learned about this while tidying the desk. I found a letter to my wife from her cousin. She was trying to reconcile their relationship two years after the divorce. I actually had a hunch of what happened, and the letter confirmed it.

When this came out, my wife was ripped with guilt. She told Bill and he began making advances for my wife to leave me for him. And even though she was very sorry, she was definitely very, very tempted, so much so that I nearly lost her. Thankfully, she had admitted that thicker is definitely better. So I knew what was drawing her to Bill.

The turning point came one night when I agreed that it was OK by me if she took a hung lover (so long as she stayed with me). That did it. The next day she rebuffed Bill (for which I am very thankful) and we stayed together. But every time we fuck, all I can think of is her enjoying his thick cock. That fantasy is soooooo hot!

That is what caused me to be a hot wife lover. My favorite part of it is when she home from being fucked with that ‘ha ha—I got the best of you and had fun doing it’ smile on her face, and I absolutely love her for it.