He wouldn't have to lick his lips. He says something just before she kisses him. I just loaned out the dvd or I'd check. I got the idea he coated his lips in a fine film of ice, which he did in one issue of the comics and which allowed her to touch him, since she wasn't touching his skin. I took her letting out the breath of cold air to back that up (bobby himself doesn't exhale cold air, hence it would be odd that her stealing his power would change how it worked). As to the second kiss, I took that as being a little more than he expected and she overpowered his defense. It doesn't explicitely say that, but that's what an imagination is for, and the way I see it that means they didn't make yet another messup (such as having them have a relationship at all).
