>>28954553This is such a dumb question, because the cuck cums whenever he wants to cum, because its HIS fetish and everything revolves around pleasing his fetish and giving him the ultimate sexual pleasure/fantasy.
The cuck is literally the master director in this fetish. He is the one that decides who is going to fuck his wife, what positions they do for his ultimate viewing pleasure, what they are and what they aren't allowed to say, where the bull is allowed to cum, what the wife does after the bull came, how the wife makes him cum (or doesn't), etc, etc.
So to ask "what is the etiquette on cumming" is a retarded LARP question. The cuck is the master overlord that does whatever the fuck he wants, and his puppets (wife and black man) help him to realize his ultimate sexual fantasy.
That all being said though, as a beginner I'd definitely recommend cumming at the very end, to prevent post nut clarity and also to just make sure you're able to enjoy the whole experience. Once you get a little more experienced with ruined orgasms etc, or you just have such a high libido that you can go multiple times in a row instantly, you can experiment with cumming while they are still having sex, ever maybe even before.