But I don’t think there is a single wizard in all of England whose growl-y voice is more impressive than Master Snape’s.
Oh, I quite agree. :D 'rawrr'

Ewww! That must be worse than cabbage, and cabbage is the worst. I’m never going to swallow a dictionary. Not even if grandma says it’ll make me grow as tall as a Mountain Troll. Mountain Trolls are too big anyway. And they fart! It’s because they eat so much cabbage, Timmy Fickamore says so. (...) Haircuts are boring!” Nathaniel sulks at once. “I want to grow my hair long like yours, Master Snape. I want to have that pony-thingy. It’s cool. And I want glasses too! I’m gonna ask Santa to give me ugly socks for Christmas so grandma can take a picture of me that’s as awesome as yours. Then I’m gonna put them on my wall side by side.
Awww... I think you capture this carefree, childish babbling very well. Nathaniel is so adorable. :)

“Did my touch offend you?”
“Of course not, you, idiot.”
This must have been Snape-Speak for 'I like when you do that. Please, do it again.' And Harry seems to be somewhat fluent in Snape-Speak. :P

And there we have their first mutual almost-moment. Yay! I really don't understand why you wrote 'Extremely Slow burn' in the warnings.