Lee was expecting his mouth on hers, so when he presses his lips to her ear, her forehead, her nose — it startles her, then makes her smile. She guides his hands where she likes them, on her chest, which — even if it's flat as a piece of paper, she still just likes being touched here.
Her hand rests on his back, lightly at first, then with her nails slightly digging in. The other hand goes between them, tugging at the fly of his trousers. Once she's got his zipper down she slides her hand inside; despite that weird emotional moment from a second ago (why does she have to make everything weird?) she's still pretty clearly ready for this.