I was trying to get an insight to his motivation. i.e. is he turned on by being the 'gopher' in an office of women? It's a common submissive fantasy. Another male in the group when he made his disclosure changes the dynamics.
My concern is that he is getting wrapped up in fantasy and may put his (and your) profession in jeopardy. There is a chance that his vanilla partner will get hurt if he gets carried away.