Marco doesn't really have a reason for taking Jean's hand, other than he wanted to. He's so focused on this he didn't really think about it. But then Jean turns his hand, entwining their fingers together. Maybe there is something about there being touch, because he feels like his sense of smell sharpens a little.

Marco takes another small inhale, his mouth falling open for a second before he snaps it shut. The spicy tea-like scent is there, caught in the back of his throat and sinuses... Marco snaps his eyes open, looking at Jean for a moment.

And then he turns his head and sneezes, barely managing to not hit Jean or his hands with it.