"Excuse me if I have trouble believing..."

"Sirius." Lily's voice is calm, even as she eyes the tablet nervously. "They're not wizards."

"How can you be sure, Evans?"

"If they were would they have talked to us? How subtle is your mother, usually?"

".....well....."

"About as subtle as a hippogriff in a ballgown, yes?"

".....I do wish you wouldn't put images like that in my head, Evans, but yes, I see your point."

Sirius pauses thoughtfully for a second, then lands the broom and dismounts, slowly.

In the next eyeblink, he's been replaced.

By a big-ass dog.

This is likely somewhat surprising, all things considered.