The King's Favourite
“Merlin,” Arthur grumbled to his servant, who was sitting by the fire Merlin looks over his shoulder at Arthur curled up in his bedroll. “Get over here, it’s cold.”
“You want me to come and cuddle you for warmth?” Merlin asked, tauntingly, but makes to stand up anyway.
“It’s not cuddling,” Arthur insisted, though he opens his arms for Merlin to crawl into them. “It’s called survival. I’m stealing your warmth. It’s your duty to make sure I’m kept comfortable, is it not?”
~~~
Arthur doesn't realise Merlin is his Favourite. Merlin has no idea what a King's Favourite even is. Everyone else in Camelot knows Merlin is Arthur's Favourite.