[Charles just gives him a look, because seriously, Merlin, you would think by now you'd know you never need to apologize to him for how you feel.]

Merlin, it's alright to be irritated with him and to want that. I won't go as far as to say I know exactly how that feels, but I can say with confidence that I know how frustrating it is to want something a friend might not even know how to give you.