Why is Black giving him a ragged piece of paper?

He stares blankly down at the newspaper clipping. It's a picture of the Weasley family standing and waving at the camera; it's from a copy of the Prophet from a few months ago. How on earth did Sirius have it? And why?

It isn't an especially interesting picture. Just eight people standing in a row in front of some pyramids. Percy has his head-boy badge already pinned to a fez, the twins are pulling faces and making bunny ears while Ginny waves madly and Molly and Arthur beam at the camera, looking sunburnt and ridiculously happy, and Ron grins a familiar lopsided grin. Charlie isn't there. There's nothing special about it. Nothing to explain why Black has it.

"I haven't got time for this. Change! Now!"

The dog looks irritated – what does it say about Remus that he can still read the animal perfectly? – and pushes the paper back into his hand.

"I said change!"