Locking the door

Part 1

"Merlin."

"Yes, Arthur."

"You are my Advisor."

"Yes, Arthur."

"You are supposed to be available to advise me."

"This is true."

"So, I don't care if you're changing or bathing or reading a 'really interesting theory into the disappearance of the last great Mesopotamian empire' or 'a chapter with fascinating insights into the potential medicinal uses of the common household mouse'. You will admit me to your chambers whenever I knock and you will never, ever, lock the door."

"Are you sure that...?"

"Yes, Merlin, I am very sure."

"I mean, I'm not that only one who uses..."

"Merlin, do not lock this door."

"Yes, Arthur."