Shouldn't it be exhibitionist desires more than voyeuristic desires? I mean in some cases they're two sides of the same coin, but given the dude's kink was being watched not doing the watching exhibitionism feels more appropriate even if it's not outside or such.
Ultimately he's paying the MC to be a voyeur, so it's not like it's wrong to say the situation is voyeuristic but I dunno.
Anyways, just a mild nitpick as someone who's into both of those things, I guess, lol. Interesting series so far, funny to imagine clients actually paying for that kinda thing.