I'm hoping the father visit next.
"Mom and Hiyori was acting weird after visiting you, so here I am"
The sister seemed to be extra regretful for not being able to help keep the secret. I wonder if she failed to help him before or something.
It seems like Aoi was still worried about her living situation. She seemed glad when they talked about the plan to look for her grandma.
Even if MC wasn't going to move, she wouldn't be able to stay at his house forever without a proper agreement. Like if they were to get married to stay together, she would likely need some kind of guardian.