So my thinking is that Riku will be used as ntrbait, I don't believe for a single moment Moka will regress, not after the comedy moment we've just been handed, he's going to talk to Moka and Ueno will get nervous about leaving her alone with him it will probably look like for atleast 2 or 3 chapters that he wants to get Moka back but then he will reveal he's moved on from her and is sorry for how he treated her, that being said, in the same way Ueno admitted that he won't ever forget about the pleasure he got from Chisaki, we might get the same reveal for Moka, but like Ueno she won't let her past define her anymore.