Ever since Rarity's transformation, she's been disappearing from Ponyville every month, and when she returns she refuses to tell anyone where she's been. One night Spike follows her and ends up at the the Castle of the two Royal Sisters, there he sees her transform into her Nightmare form.

At first Spike believes that she's trying to take over Equestria again, but Rarity explains that despite her friends freeing her, a small amount of the dark magic that influenced her remained, and once every month she is forcefully transformed. As a result, she flees to the castle to keep herself in check so that she doesn't become a danger to anyone.

While Spike tries to comfort her and tells her that he'll be there for her even if she hurt's him, Rarity reveals that she isn't trying to hold back her violent side...but rather her lustful side, a part of her that has gotten stronger every night, and a males presence simply makes that lust stronger...

Art done by Dan-Fortesque

Edited by Ernest Wood

Fetish Trigger Warning: Light Bondage, Cum Inflation, Butt Expansion, and yadayadaya... (Don't know what else to say)

(Spike is an adult in this fic.)

Author's Note: This story idea is from DarknessRising. I was interested in it and thought I would do this as one of my first clopfics. I also would thank Ernest Wood for the editing! Enjoy.