I'm gonna be honest. While the writing was sound and the descriptions were on point. There just was not enough substance to the story to qualify it as such. It was literally a glorified transformation sequence masquerading as a story. Had she had more interactions with the demon, other ponies, or hell ANYONE at all I could say it was worth the read.

But such as it is, It's just wasted potential and as such I will down vote this story. Not for any negative reason beyond it could be so much better.