"Now, who wants to see boring old Celestia? Why don't we go back to Ponyville and see your friends?" Discord suggested with a sly grin.
"Friends?! You mean those fools who can't even get a simple counterspell to work? No, I'm going to the princess to get her to fix this. She was the one who gave Twilight Screwup that book anyway." the deharmonized Fluttershy proclaimed angrily. Discord was brushed aside by one of her shoulders as she flew past him. Come to think of it, seeing Fluttershy destroy Canterlot did sound like a wonderful idea to the draconequus. He decided to follow her... from a safe distance.
The dark clouds parted and Canterlot came into view. A giant shadow climbed up the mountain and soon cast upon the city itself. Ponies saw her, gentry paniced and ran in all directions. The castle itself didn't have enough room to land so she flew around outside it.
"Knock knock! Princess Celestia?! Your favorite student caused a little problem I need you to deal with!" Fluttershy shouted at the castle. She twisted and careened her neck trying to look into the windows of the sprawling palace. The flapping of her wings created gusts that blew off flags, banners and the decorative tips of spires as she flew around. Her tail brushed the top of a keep and snapped the pole off the top of it. Inside and amongst the walkways, gaurds scrambled for cover.
Discord could hardly contain his glew as he watched the pegasus hover around the castle, sending ponies fleeing for their lives and causing havoc. He lounged on a gray cloud and watched the chaos while eating movie popcorn from a red and white bag. Of course, this was Discord. He pulled out a wooden stick and inserted into the popcorn bag and proceeded to lick it like a strange, waxy, hot-buttered popsicle.
"What are you and what do you want with my sister?" Princess Luna called from the courtyard of the castle.
"Well, if it isn't the outcast. At least you showed up on time for once. Where's your sister?" Fluttershy asked.
Luna blinked at the remark. "Princess Celesta was summoned by her faithful student Twilight-"
"Oh, so they DID send a letter? Wonderful, which means I wasted my time coming all the way here. Well, what are you looking at?! Go get your big sister and have her come fix this!!" Fluttershy sat down and folded her hooves.
"I don't know who you are or where you-"
Fluttershy sighed in frustration and rolled her eyes and head around. "Oh bucking hay, it's Fluttershy! Twilight's friend, Element of Kindness and all that... ring a bell?"
"Fluttershy, what has happened to you?"
"Oh, I'm experimenting with a new manestyle and I wanted everypony to see it! YOUR SISTER'S PROTEGE TURNED ME INTO A GIANT! WHAT DO YOU THINK HAPPENED?!" Fluttershy screamed, blowing uprooting several plants in the courtyard and sending statues flying backwards.
"All they had to do was reverse a simple sizing spell and everything would've been back to normal!"
"Sizing magic? I can use a reversal spell and have you back to-"
"Oh please. Like I'm going to risk having the black sheep sister try to fix this. King Sombra has a better chance of getting screentime." Fluttershy then turned her huge back to the princess.
Discord's jaw dropped when he heard Fluttershy tell off Luna. He spawned a donut from midair and broke it down the middle, dipped it into the cloud he was perched on and ate it. Luna did not look amused.
"Excuse me?" Luna took to the sky and turned around to the pegasus-giant's face. "I don't know what has gotten into you but it stops now." she said firmly. Fluttershy brushed past her and headed out into the town itself.
"Where do you think you're going?! What is wrong with you?"
Fluttershy turned to her. "Does any store in town sell airbush seeds?"
"I'm not-"
"Oh, that's right. Like you would know. None of the stores are open at night. And how long has it been since you visited the town in the day time? Or any time for that matter?"
"I... I try to make my appointed rounds. It's my duty to protect-"
"Blah blah blah, I haven't gotten out much since I was imprisoned in the bucking moon. Are you going to go get your sister or not?" Fluttershy mocked her from over her shoulder.
"I'm not going to go get anypony until you-"
"You know she likes Twilight more than you right?"
"I... what?" Luna was struck speechless by the question.
Discord had to slap himself in the face when he heard that.
"Oh, surprised? When was the last time she got off her flank and saw you when you were in trouble?"
"I haven't been-"
"When was the last time she read one of your letters? When has she ever needed your help for something?"
"I don't, I wasn't-"
Fluttershy turned back towards her and now advanced, both her size and her words bearing down upon the comparitively small Luna.
"She barely even knows you exist. You might as well've never left the moon." Fluttershy said with a mischievious grin.
Luna snapped. Her eyes erupted into glowing white streaks. Shadows encircled her and formed armor, altered her size and color subtely. Fluttershy took a few cautious steps back as Princess Luna transformed into Nightmare Moon.