By far the best Greg voice I've ever read. The wording, the sentence structures, even the punctuation: you dip us directly into the stream of Goyle's consciousness, and it's a fine place to be. He's very appealing, with his affinity for wood, the poignant details of his past with Vince, his brilliant moments, his not-so-brilliant ones, his humor, his affection for house-elves. (They leave him boiled sweets, awwww.)
Your characterizations overall are impeccable, Granger included ( like hermeneutical and feminist dialectic--and Greg's still not certain what Granger meant, really, by that -- hahaha). I love the throwaway details you include, of magic and wizarding life; they add such texture and density to the world you've built. I love the backstory for Greg's parents, the details of Snape's recovery, Grandmother's Persian rug, all of it.
I have to confess that while I'm completely convinced by Greg's feelings for Severus, I'm not quite as sold on Severus's returning them. Then again, thirty-three months and four days in a coma would make anyone view the world a little differently from the way they saw it before. So okay, I'll buy it.