Sassy Old King Consort

"I'm just... busy..." Merlin admitted.

"I know, but you need some time fully to yourself, to Merlin, not King Consort, not Court Sorcerer, and not Guais' apprentice. I know you can't stand being cooped up in our room all day, which was my strategy, so let's find something that works for you," Arthur suggested

"I could... disguise myself? Magic makes that fairly easy..."

OR: King Consort Merlin ages up as a way to force himself not to overwork himself, then he and GWEN cause chaos