Flowers adorned every wall and window of Canterlot Castle’s throne room. Hundreds of ponies crowded the room. On the dias at the front were a dozen ponies, and at their center, beneath an arched wreath, stood Fluttershy, wearing an enormous bouquet behind her ears, and Discord, wearing an even more enormous one behind his.

“If there are any objections to this union,” Celestia said, “speak now, or—”

Sparks exploded across the dias, and a white glow bloomed in the space between Discord and Fluttershy. A sudden spiralling wind whipped their manes. Wisps of smoke and ozone spun around the vortex.

“Twilight,” Celestia said with a disapproving frown, “what did I tell you about time-travelling?”

“I didn’t do anything!” Twilight said. “I’m right here! … oh.”

The glowing sphere collapsed on itself with a bang and a flash, and another Twilight stood on the dias. “I object!” it shouted.

A din arose as the throng of observers began talking excitedly. “Called it,” Discord said to nopony in particular with a bored yawn.

“I’m so sorry about this, Fluttershy!” Twilight said. “I don’t know what I’ll be thinking!”

The new Twilight turned urgently to Fluttershy. “Don’t do it, Fluttershy! I’m from the future! This marriage will be a disaster!”

“Hello, Twilight,” Discord said to her. “How thoughtful of you to add a little chaos to my wedding.”

Twilight glared at him before bending toward Fluttershy. “He’ll never grow up! He’ll never be reliable! He’ll break every promise he ever makes!”

“Oh, Twilight,” Fluttershy said. “Surely not every promise.”

Discord bowed to Fluttershy. “I promise to break this promise, my dear.”

“You can’t do this!” Twilight insisted, ignoring Discord.

“You’re just jealous,” Discord said.

“I am not! In fact, I’m already married to…” Twilight looked away and blushed.

“Yes?” Celestia asked with a smile.

“I’d like the answer to that as well,” Discord said. “Wouldn’t you, Present Twilight?”

“What?” The present Twilight half-flew across the dias and pushed her muzzle at her future self. “Who? Who am I married to?”

“Well, Twilight?” Celestia asked. “Aren’t you going to answer your own question?”

Future Twilight pulled back from her past self. “You were right,” she confided to Celestia. “Time travel can be incredibly awkward.”

Celestia nodded sympathetically. “Now, you’ve had your say. Twilights, I’m afraid I must ask both of you to step back and make some room for the bride and groom.”

“But… but, you’re not going to let them go through with this again, are you?”

Celestia smiled. “Twilight, what do you suppose would happen if I stopped every pony I thought was making a mistake?”

“I don’t think she’s making a mistake. I know she’s making a mistake!”

Celestia shook her head. “No, Twilight. You only know what’s going to happen.”

Present Twilight led a stunned-looking Future Twilight back to join her in the line of bridesmaids. Celestia looked up and cleared her throat. “It is not often that ponies contemplate the union of marriage with of foreknowledge of the future. Consider it carefully before you take your vows.” She leaned closer to Fluttershy. “We aren’t in any hurry here. Take as much time as you want. This day is yours.”

Fluttershy nodded back. She took one step closer to Discord and looked into his eyes. “I promise you, Discord, that every day, I’ll be the best mate for you that I can, and hope”—she glanced at the future Twilight for just a moment—”and hope that will always be enough for you.”

Discord reached out and took her hoof in one claw. “I promise you, Fluttershy, that every day, I’ll be the best mate for you that I can. And I hope that will always be enough for you.”

“I judge these promises truthfully spoken,” Celestia said. “Do you, Fluttershy, take Discord as your mate?”

“I do,” said Fluttershy.

“No!” future Twilight gasped.

“And do you, Discord, take Fluttershy as yours?”

“Absolutely,” Discord said. “Also: unreservedly, unequivocally, indubitably, and indisputably.”

“I pronounce you pony and pony,” Celestia said. “You may now kiss the groom.”

The future Twilight fluttered her wings helplessly. “He’s bent to the bone! He’ll break your heart a hundred times! It’ll all end in tears!”

Fluttershy looked up at Discord and smiled. She stretched her head out and kissed him on the cheek, and the angry glare on his face was washed away by a smile of happy confusion. Then Fluttershy turned back toward Twilight, who was beginning to fade.

“Oh, Twilight,” she said. “I already knew that.”