She knows he's been constantly watching her, which she doesn't mind at all. And for weeks, she's been developing a crush on him, so this is her being calm while, inside, she's bouncing up and down going "SQUEE! OMG FINALLY! HE TOUCHED ME!" - this is where the actual... initiation of any sexual relationship will be interesting. She's - basically - gagging for it, but doesn't want to appear forward. And he is, above all things, a gentleman.