Nice look into the mind of a man who remained mysterious for most of canon. Given his role in the books, I could totally see this being true. Nice work.

"or delight in the small things children do as the other Professors were." First, Professors shouldn't be capitalized. Also, this part was just confusing. I feel like there something is missing between
"the small things children do" and the "as the other Professors were".
"to the muggles that detailed the perils" "muggles" should be capitalized, since it is in the books.
This was an interesting fic. I like the idea of him being a successful Potions professor because he's so quick to notice things being off. Him seeing all of the things going wrong with Harry and trying to fix it, but not being able to in time for Voldemort rising again was a sad, but interesting way to end this story.