[He moves his book out of the way when Bruce shifts, and his eyes widen, face heating slightly when the younger boy makes himself comfortable. Oh. O.. kay then. Anyone watching would no doubt find the expression on Arthur's face somewhat comical as he struggles over what to do about this new development, then he rolls his eyes and sets his book aside.

At first, his hands just hover, then he rests one on his friend's upper arm and the other on his hair, his thumb twitching in idle circles against Bruce's scalp as he looks out of the window and.. just tries to ignore what he's doing]