He never said anything about it but it was obvious his technique was hurting him. Constantly seeing the flow of other peoples cursed energy really overloaded him. Of course being the (lovable) idiot he is, he only wore sunglasses to counter act it. Who in their right mind thought sunglasses would suffice?

Again today you could tell it was bothering him. He was stubborn, never telling anyone but you could just see it. The occasional eye squint, pretending to be frustrated and using it as an excuse to drag his hand over his face to hide his eyes momentarily, and then the faint tear streaks around his eyes occasionally. You knew it hurt bad.

You just got back from buying him something from the vending machine, seeing him sitting under a tree with his sunglasses off and his eyes shut. You sneak up on him, dropping the drink you bought him and covering his eyes with your hands. He couldn't even try to hide the sigh that escaped him when his eyes were covered. "You can tell, can't you?" he muttered, you could hear the strain clear as day in his voice, the pain.