After seeing it recommended a few times, I have read
Dungeon Keeper Ami, a pretty ridiculous-sounding crossover fanfic in which Sailor Mercury becomes a Dungeon Keeper.
I actually found it enjoyable because it has an intelligent and protagonist with moral integrity put in morally difficult circumstances.
My link is to TVtropes, where there are links to a few ways of reading it. I would recommend reading either in ebook format or
on its wiki (the main addventure page is slightly more difficult to read).
