Danny leans back as well and has a matching blush spread across his face--although his is red. He's more or less used to Walter's, though--he's seen it enough times to know it's not some kind of sickness, but rather just the way he blushes. Much like how his own is green in ghost form. He's become comfortable with it, so this isn't much more of a stretch, although Walter seems significantly less okay with it.

Danny picks up a slider. "You know...if you want, I could smear ketchup all over your face. Would that help?"