Wanted to read it all, but only made it halfway through until I couldn't hold back anymore.
Read the story now
I really like the story so far. The POV perspective is something I thought I should use in mine as well. It's great and your execution is marvelous! Sometimes, I'm doing something downstairs and just start to think, "Mmh, what will...what if...then?" So to say your story captured my imagination should be most accurate.
I really don't like the headmistress though. I want Kasdeya to tell her to shove her punishment, else she starts to think of some for when she will rule. Therefore, I suppose, Charon is a well-written character. :D
I don't feel adequate enough to point out anything in your writing skills. Not that I noticed anything so far. I can only read on and learn, and so I will, meanwhile already flirting with Hellfire.
Also, are you planning a paperback release? I want it, and I think it'll fit in well on the shelf next to my little wine collection.