Oh, he can't resist. That's such a good opening to dramatically reveal himself. He's nothing if not theatrical.

He grins. "I am certainly not human."

There is a bit of rumble, and his illusion tears open to reveal a humongous grey dragon. He is neatly curled up, his wings folded, and his head's lowered to be level with Rose. Sparks dance between his two horns, and just his head dwarfs Rose and Pen entirely. Glowing yellow eyes consider them both.

And I am somewhat magically capable, he says, a little smugly, in a publicly broadcasted sense of words that bear only vague similarity to what he originally sounded like.

That is probably an understatement.