“I know that fantasy, best avoided IMO, it could have happened with a friend of mine everyone was in the right head space for it to happen, but my alarm bells went off in a big way and I overrode my dick that time.
As it happens the now X friend had been plotting to take my wife away from me, not that he would have succeed, but found out later he had been majorly poisoning the well behind my back.
Avoid that one like the plague guys.”
If there’s a particular guy that’s in mind for a threesome or cuckold experience, there’s a pretty good chance that the other man has been stirring the pot behind your back with your wife all along.
I would not regard that as “friendship” despite how ever long you have known him. Agree with cutting him out of your life.