"You always have books on you," he kept his voice low, eyes on the charm. "Your storybooks and Malfoy's journal. These keep them safe and on your person at all times," he looked at Malfoy when he said that part, remembering how upset he was when Weasley had touched his book. "It doesn't just work with books," Harry pressed his camera to Malfoy's charm, watching it swallow it up. He swiped his thumb across the engraving and his camera was in his hands again. "I have one too," he pulled it out from inside his jumper. It was also book shaped, to keep with the theme, and had a small engraving of a Lily on it. He'd wanted to put a doe, but chose the Lily instead. So it was unmistakable. Only people who knew his mother would understand the significance of the doe. Any and everyone would recognise the Lily immediately. Would see that Harry kept his mother close to his heart always. 