HP: Lamplight

An original female protagonist and the professor: long live the student overthrowing the teacher! The story takes place before everything begins. A not-yet-gloomy little snake meets a heroine who likes to show him a little kindness now and then. She keeps him from sinking into a dark childhood, but the snake's way of repaying her kindness is terrifying...

Theme: I love the professor. I write my own supply.