It was another question Oscar had fielded to him at one point. He never really thought about how what he did probably should hurt, but it was....effortless. Like changing clothes, really.

"No, not at all," he replied, honestly. How little he understood the workings of it all himself was frustrating, and now he wondered if he was ever going to find out without Eliza around, as much as he hated to admit he needed her. "...Fuck, it's kind of hard to explain, honestly? I want to become it and it happens. And when I want to be human, I can do that too."

He nearly said it always was this way, but wisely doesn't. He still was trying to keep up appearances this was magic, not some innate part of him, after all.