[Obviously we need Luna around to sit on her so she doesn't get out of bed. No one can disturb a kitty when they're on your lap!!

The idea of heading up a ladder in his current state wasn't exactly thrilling for him, but he nods nonetheless. What other choice did they have? (Except maybe Makoto yeeting him up there, but that would go badly for everyone involved)]

We won't know until we look. Maybe it'll have a pull-down ladder attached to the door or something. If they bothered to put staircases in the rest of the house, I can't imagine they'd leave out a way to get to the very top.