He flinches slightly at the touch, but settles back down again. Right... just focus. Focus on his brother's touch and the fact that he's fine, he's not breaking or anything. He closes his eyes and takes a few deep breaths. "... Thank you."

He's fine. This is just... something strange brought on by stress or something. It'll pass, right? It should. "I don't want to give you even more trouble... but I know you'll insist anyway."