So it turns out I write pony corruption quite regularly. Hive mind anyone?
The Specter
Denied by her love, Twilight seeks a way back to Rarity, or at least some form of peace. In one of Nightmare Moon's old books she finds a spell that could give her both. Question is, does she want to pay the price?
Contains: Transformation, Mind Alteration, Bondage and Corruption. Considering the author, I think you could have guessed that by now.