You know, to be fair, his hesitation to confess up to now is pretty valid. To cohabit for so long without even dating, once the feelings are out there and one of them refuses, it gets awkward to live with them. For the woman, especially, since it's her own home to begin with, she could feel threatened into being assaulted in the one place she feels safest in.
Granted, it's a wonder why Tokimori even let MC stay without considering that from the beginning, but let's just put those thoughts aside and relish the fact the two are finally going to be official.