@B P (Ult1m4) Most likely it's an attempt to lure him into thinking of the capital as home. It gives him massive prestige to use in negotiations with other powers, and a trump card incase a critical problem like a dragon or invasion happens. Since the demi g** is not only saving innocents but so his home, the servants he gets to know and any family he ends up starting. He** the king likely wouldn't even have to ask, he'd volunteer to resolve a crisis and save his waifu.