Will wasn't as dumb as he sometimes seemed. He had always been praised when he was young for being extra observant, noticing people and their personalities at least when his feelings and judgement wasn't involved. The latter two were most definitely in the picture right now but he just understood James. He did the same himself, hence the fight in the canteen....
His thoughts were interrupted by James' hand over his. So the guy was actually taking advice - that was good. Though something in the way James looked at him told Will that maybe it wasn't just him trying to be nice and friendly, he was at a loss to pinpoint exactly what James was doing. Still accepting, the other man nevertheless smiled against his touch.
"Yeah, I know," he chuckled. "You'd look good with some, too. You should try."