In order to prove that she isn't insane, Rarity, now Muckity, shows us one of her closest friends!
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This is the first in a little series I've got in the works surrounding a bunch of my old projects that I either abandoned or never saw the light of day in the first place. To start off with we have the horrifying Muckity; a friendship-with-benefits-crazed Rarity with the ability to absorb and corrupt those she feels closest to.
I had originally planned for the original series to spawn a full plotline, detailing how Rarity became this way and the process that lead to her first vile act. Had it gone ahead, Muckity would have grown in strength to the point where she essentially took over Equestria, the land now populated by her gooey subjects. The other members of the Mane 6 would try to use the Elements of Harmony on her, only for Twilight's own anger over Muckity's actions corrupting the magic, leaving Muckity unscathed and her former friends fighting for their lives. At that point there would only be one way to save them…
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The original Muckity image (NSFW)
Others in this series:
Vertium
Sparkfree and Blitz
Tatzldash
Floaty-Robo-Ponies
Dead Mares Walking