Writing a dark Aeris is an incredible challenge, if only because she's been made into such an icon in the fandom. You did a good job of tying this in with the canon material, just giving it a 'through a glass darkly' twist. After so many St. Aeris the Holy Martyr [TM] stories, it's pleasant to read this interpretation.
(Though I'm probably going to fandom hell for writing that! :) )
Author's response
Thank you so much. It's nice to know I got what I was aiming for. I like the Aeris-the-holy-martyr idea, but I just get so fed up with it when I'm reading. I also have a habit of twisting canon to make things darker.
(If you're going to fandom hell for writing that, then I'm certainly not far behind! :) )