Closest thing I have to that is http://www.fimfiction.net/story/152443/chrysalis-egg-basket , more specifically the trixie / changling pt 1 -2 chapters. Its pushing it though, since its only a little rapey. just a little. Certainly no one gets murder-raped, so compared to most of the stuff I read, its practically vanilla.
Then http://www.fimfiction.net/story/29576/competent-villains-chrysalis since its not as rapey after the Stockholm syndrome sets in on most the characters.