Yeah don't know how to feel about that. The fanservice was whatever, but the bath scene was dumb.
They're supposed to be seven. The princess's reaction is the typical one, the guy's overblown reaction to nudity is just creepy. Reincarnated or not, if he can sexualize a 7-year-old and feels uncomfortable enough that he needs to make her wear a swimsuit in a bath, that's a little gross.