For Kira, yeah, that BDSM kinky stuff at the very beginning of the original game just fell flat, I hope Aleksey90 is into that stuff with Kira, because I'd love her to get way more extreme now, perhaps branch routes between dominant or submissive (no dildo into Max though!), or better yet, let the player choose what he wants to see each time.
For that mysterious dude, the best would be either to let him lurk in the shadows for the NTR haters, and simply demand the money back to Max and Ann, forcing her to make quick money and fast, hence the porn movie making. For NTR lovers, that dude would become a more active sex partner to that family.