I have a soft spot for micro bangs on character designs, but I don't love it on Aya. I think it might partly be because her hair resembles another character's I had come across on knzm's instagram, who has a completely different vibe to Aya. For Mitsuki, I can understand the disappointment, but I will never say no to a bob cut. It's just lovely.
As for the chapter itself, I agree that the "did she bring home a girl?" line didn't land very well. Even if it wasn't meant to be taken seriously, it didn't have a place in the story and it wasn't really funny as a joke. The whole chapter felt a bit awkwardly written, even by this manga's 4-page standards. Though it might seem that way because the latest chapters had more continuity compared to earlier ones. I imagine it/I will get back into rhythm in the next few releases.