Regarding the client's offer... in light of the conversation the client had with JH previously, my guess is that he is very hot for Jane but wants to be at least slightly discrete about it. He indicated previously that he had some weird/strange (can't recall the word exactly) experiences with married couples (HW and cuckold) so perhaps he wants to quietly have sex with Jane without making it into something overtly involved JH. At the same time, if he just wanted to have a clandestine affair, he wouldn't have made his proposal in front of JH. Again, on the heels of his conversation with JH, I'm guessing he may not realize how far you two are along the path of HW/cuckold and that he may view himself as a man who could introduce you two to a new level of eroticism in your marriage. Little does he know

but I'm sure you (Jane) could teach him quickly!!! Might be fun to play naive and let him slowly seduce you. Could be a lot of fun being an "assistant" and could be financially rewarding as well. My guess is he would tip his assistant handsomely

!!!
Again, the previous conversation between JH and the client leaves little doubt in my mind what the client wants. If he just wanted an "assistant" he could hire an assistant. He is hot for Jane and wants to be a bit more discrete about it than somebody whom you met online, Jane.
I may be wrong, but I don't think so. One way you could nudge the issue along Jane is to call him and ask him more about his offer - or go to lunch with him and talk to him more about it... one-on-one.
