"I'm practicing," Niki said again with a stubborn note in his voice. "To get really good at it. I want. To be a bird." An avian Animagus he meant, of course. He probably didn't want to be a bird all the time. Having legs was good for some things. Plus, he didn't want to eat worms. Well, maybe a tiny bit.
His face scrunched up at her then when she denied he was him. "I am so," he said, sounding offended. "I always have been. Ever since I was born." He folded his arms over his chest, which was a much less intimidating looking stance while sitting down.
He wondered how he could prove it, and then he grinned and fumbled with his pockets to pull out his wallet. From which he drew his Apparation license, which he held out, to show her. "See?"