[Yuuri's expression and tone both remain soft as he heard that answer. The fact that Gray was feeling anything was a good thing, and he hoped that his new-found friend will be able to manage the transformation.]

That's good. Keep focusing on those feelings.

[He paused for a few moments to allow Gray to keep his mind focused on such things.]

When you start feeling that warmth in your chest, I want you to slowly start reaching out to it with your mind.

[If done correctly, then Gray might be lucky enough to transform.]