Well I can try. Like I said my wife is fully into black men and cuckolding me. I would never suggest this as a way to trick her into it.
For us she meets almost all her lovers naturally while out and about, we rarely do the internet hookup thing. The only issue with this method is I like to watch and she prefers when i am there as well, and well in real life most men don't like the surprise audience. When she meets a guy out if she feels he can handle it she will tell him a lot of the time she does not. On forums and boards like this it would seem that everyone is very into this stuff, but unless I have met the wrong people this is still very much a fringe. So We decided that sometimes I can stack the deck to help us get what we like the best.
I will post ads on sites like double list (rarely pans out), Also I have a second profile on SLS that I clearly spell out what I am looking for ( this works better then Doublelist). Anyway I will communicate with these black men, often have a face to face meeting over a beer or coffee. If I fill he is safe and her type I will let him know where we will be the next time we go out (this can take more then one time out) . I do not give him any inside information on her, and he knows this is no different then him hitting on any other women except he knows her husband is not gonna punch him. That is the gist of it. I know not the fantasy writing stuff.
We have had success from this many times, but it takes a lot of weeding out for me it is a bit of work. The amount of work required is the reason my wife does not use the internet for this, nor does she do chats. The rule is he is not to let on I arranged this in any way if he does that is it is over, She has guessed a few times the guys approach was just to easy to spot as a set up. It has been fun and has gave a few good partners.
Not sure what kind of detail you were looking for.