She seemed confused at his question at first before coming to the realization of what he meant; that was a good sign.  As she exclaimed her good health, Kyle felt a small wave of relief wash over him.  He smiled back at the girl and he could tell by her aura that she had become quite comfortable around him; this was also good.  After some contemplation she thanked him again, no, this time she wasn't thankful, she was grateful.  She seemed grateful that he came to her aid, even if he lost control of his powers for a fraction of a moment, nearly causing her harm with his heat, she was grateful.

Kyle had always considered his rage, his curse, a stigma upon his existence, a cancerous and festering thing with the fiery rage of a thousand suns.  Yet here this girl was, grateful for the anger he produced and he couldn't help but feel both glad that someone accepted it, but also...confused, maybe even concerned about his position.  He didn't want to make a habit of losing control like that, but at the same time, Kyle couldn't help but feel a sort of kinship with Grace.  He wanted to spend more time with this girl and if anyone had any unwanted intentions with her, they'd answer to him.  Like he said though, he didn't want to make it a habit to lose control every time someone looked at her wrong and she reacted badly.  That being said, he knew her confidence would come in time, and he wanted to see just how far she could go, because deep down, something inside him said that beneath her delicate exterior, there was the potential for a powerful tsunami.

He smiled at her, "all in all, I'm glad you're ok."

"Alright students!" Kyle winced at the bellows of Mr. Steele, "time for class, let's move it!"

"Hm, shall we?"