She's practically panting and she puts down her quill. She props her elbow on the table and rests her forehead in her hand, as if something she's reading is vexing her. This is a good idea, but Draco knows that in spite of her best efforts - and his - there's no way they'd fool anyone who happened to be watching. He takes a quick glance around to satisfy himself that they're still alone, and rededicates his fingers.