He isn't really sure what it is he's sensing from her. But it's definitely not fear, which...while confusing? Is a huge relief, because it would make the rest of it easier to explain.
His breath hitches as her fingers trace across his face. And when she asks him to show her again, he can't help being confused at that. This girl, who for all intents and purposes, had absolutely no reference for the supernatural, was jumping headfirst into it and he can't help the swell of hope that rises in his chest because of it. Because of what it might mean.
He does as she asks, though, and shows her his full transformation, looking up at her, almost sheepish, and waits without a word for her reaction.