So, I don't see the "Pony Corruption" thread anymore, and I will just leave this here then:
Mistress Butterfly
It was supposed to be a friendly favor, but when Rarity stumbles upon some ancient dark magic, she is urged by it to use on Fluttershy, awakening a being so powerful, her desire alone is magical. Now Rarity is under the spell of Mistress Butterfly, and her friends are under danger of falling under The Real Stare. Good thing free will is so last season.
Contains: MC/Corruption, Latex, Leather, Bondage