[after telling Harry to close his eyes, Ginny hides his book somewhere in the Room of Requirement, then comes back, and gives him a soft kiss on the lips]
Ginny Weasley: That can stay hidden up here too, if you like.
[a short time later, Harry is walking down the hallway, in a daze. Ron appears beside him]
Ron Weasley: So, did you and Ginny do it?
Harry Potter: [alarmed] What?
Ron Weasley: Did you hide the book?