I agree with you the sharing scenes are quite good. With her teasing him and watching and asking to be sure there are on the same page, plus him having some action too.
Actually, would i be the one doing the game, i'll use that. I'll have some customers asking questions, enquiring. I'd have add the possibility to open the backroom only to some connoisseur, or to have the girl offering a pass to some of their favourites one (with serge being an accomplice, there's at least a scene when she take one backstage).
And why not a couple, coming out, enquiring about the life style (either the girl or the guy being interested by it), and asking for advices or a part-time job...