Merlin/Arthur, Arthur burns his hand a bit. Merlin applies honey. Tasty fingers, apply tongue. Blowjobs ensue, as they do.

Or,

Merlin has developed an allergy to the new laundry soap. Better get him out of those clothes, quick, Arthur! Wouldn't want him to get a rash. There might have to be a bath- you know, to get rid of any lingering laundry soap.

God, now I really want some honey. And to do my laundry.