Nightmare, The untold story of the princesses of Equestria

"Come on princess, pleeeeeeease?" Asked a filly Twilight. She had been nagging Celestia all day about her mysterious sister, who Celestia refused to talk about.

"How many times do I have to tell you Twilight?" Said Celestia in an annoyed tone. "The answer is no." Celestia walked down the long hallway leading to her throne and sat down, putting a hoof to her forehead. She was sensing the start of a headache.

"But you never tell me, anything about your sister besides: She turned evil, she's gone now, it's none of your business Twilight.

"I tell you these things because they're true." Celestia responded, hoof still placed on her forehead.

"That's not what your diary said." Said Twilight confidently, Celestia slammed her hoof into the arm of her throne.

"Did you read my diary?" She asked, getting up and looming over Twilight who backed away slowly.

"Just a few pages, and they said, you were tired of lying, and They don't know the whole story." Celestia shook her head.

"I'll be sure to destroy that diary, Twilight you shouldn't have poked around through my personal belongings."

"I'm sorry!" She said in a frustrated tone. "I was just too curious, but now you have to tell me."

"No I really don't."

"If you don't," Twilight paused for a second, thinking to herself. "If you don't tell me I'll tell everyone what I read from your diary!" Celestia paused, she couldn't have everypony knowing her secrets.

"I can't believe I'm being blackmailed by my own student." Said Celestia, giving in to Twilight's will. "Alright, I'll tell you." Twilight jumped around the room cheering. "But you have to promise, never to tell anypony." Twilight nodded furiously. "Okay, it all started a thousand years ago..."