There's a line he should give to make himself sound cool or more in control of the situation. That wouldn't be true. His heart is hammering in his chest. When he leans down to kiss her, it feels like his lips are numb from the effort. Once they connect with hers everything comes more naturally.

He kisses her again more passionately. His heart still pounds, but the nerves seemed to have faded for the time being. It's nice; nicer than it should be when one factors in this might be inappropriate. Steve really can't bring himself to care about that yet.