He's fine okay he's done worse! Besides once she starts laughing he can't-- help grinning too, even though he doesn't get why this is even funny in the first place. It's why his voice has a hint of protest to it-- it's not that he's gotten short, Xion.

"No, you just got tall!" Did she grow because she was getting older? He was pretty sure it didn't work like that, because then he'd be taller than her. And he's certainly... not. The urge to place his hand at the top of his head and see just how much height she had over him comes and goes briefly, a childish action from another time that he doesn't remember at all.

But really she needs to stop laughing because, after another moment, he's letting out a chuckle. No one ever told him laughter was contagious. "Why are we laughing?"