Holy Mother, he cannot stop himself from staring as she pulls off her sweater leaving her top half bare. This wasn't what he meant, but he is more than fine with her interpretation. His hand moves up the small of her back, running over bare skin. They're in a library, it is not a private place, but things like that are forgotten for now. He leans down, licking over one of her nipples before sucking it into his mouth (something he read in a naughty book I'm sure).