King Sombra turns Celestia into his loyal, brainwashed knight, one piece of enchanted armor at a time.
Takes place in a slightly altered version of the season 9 opener. Idea blatantly ripped off from the coverart (the full version of which can be found here), with a little bit of Dinaranger thrown in for funsies.
Contains: mind control (duh), light magical bondage, magical, soul-corrupting armor (duh), weird latex goo, encasement in said latex goo, and no consent whatsoever. None. Absolutely zero, no-siree.