Such an amazing genderbender, but mostly because it's à la Synn! You have such an economy of style, able to accomplish so much with so few words. The first time I read it, I was sort of holding my breath, anticipating Snape's 'big reveal' at the end, but when you ended it the way you did, I sat back in my chair and said, "AHA! She's a genius!"
And did you see, someone wants you to write a story arc! hehe. One of the great things about this is that the reader just can't stop their minds, even though the story's ended. I've found myself smiling as I imagine the sequelae....
Just such a twisted, original, expertly executed piece of work! I'm so proud of you!