Not long after the development of Celestia and Discords friendship, ponies seemed to trust him more, they stopped trembling in fear every time he approached they also did not fix him with glares everywhere he went. What Celestia had said all those years ago was the truth. And the best thing was... their friendship was EASY. He would make an effort to be nice to ponies and help them out, and she would put up with his pranks, would even laugh at them!Sometimes, she would even help him with them. They just fit together... like puzzle peices. And Luna had been completely supportive of their friendship. All the pain and sorrow of the past had been forgotten and forgiven between Twilight Sparkle (after she became an alicorn) had begun to trust Discord. And soon all of Equestria had followed suit. Save a select few whom simply needed more time. Everythng was right and just, and nothing could mess it up...

... Not even Eris...

"There," Luna said "All done." she stepped back to admire her handiwork. The ceiling of the Great Ballroom had now been transformed into the night sky. Discord had shared some of his personal recipies for the food. Celestia had made the dance floor truly spectacular, certain discs in the floor would rise up in the air when a couple would start dancing on them. Twilight had selected the music which would alternate between an orchestra and current music. And the rest of her friends had orchestrated all sorts of entertainment. Rainbow Dash and Fluttershy had created sort of a lovers loft, in one of the garden circles they had created a light fog with butterflies and fireflies flying around. Applejack had brought enough cider to last the night. Pinkie Pie had created a childrens place in a smaller ballroom and she would stay there through the night watching the kids with a little help from Cadence. Rarity had set up a dress up booth featuring her designs...
This was going to be the best Grand Galloping Gala ever...

Later that night, while the music swayed gently Celestia and Discord were having a light snack. after a few seconds Discord cleared his throat.
"Umm Celestia?"
"Yes Discord" she replied looking him right in the eyes, stunning him for just a second.
"I.. uh need to tell you something... I..." He was cut off as the lights went out.

The lights snapped back on as a feral cackle filled the room. The voice belonging only to one person.
"Eris.." Discord said whilst taking a step foreward. Eris seemed to be the same kind of creature as Discord, in fact she bore a striking resemblance except for the fact that she had a white mane. She stepped down from the stable she stood on.
Well, well, well Discy long time no see." Celestia looked at Discord "Who is she?"
"My sister." He repled, narrowing his eyes at Eris. Eris laughed again and began circling the two of them.
"Ohh i see you managed to get the pretty pony princess wrapped around your fingers. What's your plan this time hmmmmmm? Taking over Equestria... Again?" Celestia Narrowed her eyes and pushed her face close to Eris'
"He's. Not. Like. That. Anymore." Eris looked over at her brother.
"Oh boy you really do have her fooled, don't you?" she circled behind Celestia. She stepped on Celestia's tail, her paw sliding to hold her back while the clawed hand clamped over Celestia's mouth. "You know we could make this much quicker if we just... took her down." she gave a sly smile. Discord could tell Celestia was struggling to use a spell but Eris was using a magic cancelling hold. Discord saw red.
"GET. OFF. OF. HER." He pounced on his sister, pinning her to the ground.
"Leave, Eris, Leave and don't ever come back." Eris cackled again.
"Oh Discy you've gotten soft, but then again you always had a bit of a soft spot for HER didn't you?" She snapped her claws and was suddenly standing ten feet away. "You'll have to do a little better than that Discy. Wether you like it or not I'm taking down this flowy maned monarch, and if you have any sense at all you'll help me." Discord was about to pounce again when Eris snapped again and was gone.

Once the initial shock had worn down, Celestia looked around the room.
"Oh it's all a mess now."
"Easily fixed" Discord replied, snapping his fingers. At that moment everything was back in it's place. Luna and Twilight rushed in.
"What happened?" they both asked.
"Nothing to worry about I'll tell you both all about it later." Celestia said. The geusts shook their heads and continued on as they had before it seemed that Eris had placed a freeziing spell on them. Luna and Twilight exited and as they did Luna whispered something in Discords ear, his eyes widened as he qiuetly said "thank you"

Discord turned to Celestia and cleared his throat.
"Celestia, may I have this dance?" Celestia looked him in the eye and smiled.
"Of course." and without knowing they stepped on one of Celestias rising discs. Soon they were twirling and turning to the notes of "Dark Side"
Perfectly in sync they whirled away as the disc rose off the floor about 10 feet. Every one stopped to watch the two of them twirl away. Everypony had given up on Celestia finding love but as they watched her turn with Discord they found hope anew. Some even felt the song fit them perfectly.

Everybody's got a dark side
Do you love me?
Can you love mine?
Nobody's a picture perfect
But we're worth it
You know that we're worth it
Will you love me?
Even with my dark side?

Don't run away
Don't run away

Don't run away
Promise you'll stay

You should probably ask her to dance

Luna smiled triumphantly as she watched her sister whirl away. She had made good on her promise. She could tell things could only go up from here, and of course she would keep giving gentle nudges in the right direction.

Let the flames begin