I said in an earlier chapter I had been hoping Itsuki was an "actually a girl", would take interest in Kyousuke, and give Rui the kick in the butt she needs to value Kyousuke more and put more into the relationship.
If this is where it was going to go with Ituski anyway, that would've been a lot better and a lot simpler even if it's somewhat cliche/tropey. Or even just make him a gay guy that doesn't have the backstory with Rui. So many ways this could've been done more simply that would've been better.