It didn't take long for word to get out that the prince of darkness is leaving the underworld to go find some human boy of course
everyone is thinking he is going down the path his father went down by fall for a weak human but what he is doing is nothing like what his father put his birth mother through as he will never make his love do anything he wouldn't want to do or try and make him live in a uncomfortable place where they would be stuck in one place
Yes the castle is very big but even for a human or demon they will get bored after so long and will want to leave and no matter what you can't make someone stay in one place they will just go crazy and they will most likely do something to someone around them or worse do something bad to themselves so to keep them happy you'll have no choice but to give them some freedom even if you pick and choose what they have the free will to do and can't do