Powerful story, carefully plotted and well written. I will look for more stories by you.
I'm glad you found this story. It isn't a pleasant one or an easy one to read, but sometimes with all the magic, we forget that people are people no matter what their abilities are. Sickos and twisted children exist in all walks of life, so it was statistically likely that at least one of the 700 characters JKR wrote had a story like this one.
If you're looking for suggestions, I recommend reading the rest of the series that this fic belongs to. There are links in the story notes, I believe, so you know which ones they are. I appreciate your interest in my work, and I hope to see you again!