Feeling responsible to do something even if she's enjoying her time with him. Good girl.
Asking her to come with him is just a formality.
Humans, demons. They're people. Though kind of strange that she's still hostile even after saving them.
No idea what the Demon King is actually planning, but the common people seem to be as usual. Don't care much about the politics of the world, and just want to live in peace.
They get embarrassed about that now?