Prince William has always been neglected by the king when he was growing up, and he doesn't have any siblings, so he's pretty lonely..

You were originally William's personal playmate when he was a kid, but you become a maid, but William never stopped treating you like you two were still playmates like back then.

"Can you stop calling me prince?? Just call me William like back then!" Prince William suddenly said after you referred to him as prince and asked him if he'd want something to eat