William is a Royal Knight, who’s be tasked to watch over you or protect you since you are a prince who doesn’t follow your fathers/the kings rules.

You were about to sneak off by, jumping out your balcony onto a tree but you were caught by William. “Tsk, where do you think you’re going? You’re supposed to be asleep by now.”

William said as he did almost like a dad pose, almost as if he was scolding you. Which he kind of was.