Ten ponies stood in front of a shimmering portal, four slightly bigger than the others.
“So Twily, whatcha got here that you called us all to see?”, Shining Armor asked his sister.
At the moment, the purple unicorn was busying herself with calibrations on the metal box that seemed to be controlling the magenta vortex.
“Only the most revolutionary magical and scientific discovery to behold in centuries, of course!”, Celestia answered.
“Twilight is extraordinary.”, Luna mused with a faraway glimmer in her dark blue eyes.
“Yes, ‘my’ student is quite something, isn’t she?”, the white alicorn gave a pointed look toward her sister.
Luna opened her mouth to retaliate when Twilight gave an excited yelp.
“Ha! It’s ready! Fillies and one gentlecolt, I present to you the future of magic: a portal to another dimension!”, she announced with a showpony bellow.
“Another dimension? Like two dimensions is flat and we’re in tha third dimension?”, Applejack queried.
“Good guess, but no. Perhaps an explanation is in order. As I have been studying for the past few years, I stumbled upon an amazing truth. You see, we make choices every day, and there are thousands, no, millions of undiscovered possibilities. Where do they go? The answer: alternate realities. For every decision, every crossroads we come to, there is another dimension in which the outcome was different. We can even see the past and the future. There are endless other worlds out there, and I have configured a device to show them to us.”
“So what you’re saying is, there’s a world where I didn’t marry Shining?”, Cadence’s face was scrunched up in worry.
“Well, yes, but there are also worlds in which he was born after me, born the opposite gender, and not born at all. If there was even a slight possibility, it happened in another dimension.”, Twilight explained.
“Opposite gender?”, Shining’s expression was one of pure horror.
“That goes for all of us. It’s funny you brought that up, because that’s the example I’m going to use. So sit back, relax, and enjoy the show.”, Twilight grinned slyly.
A harried purple unicorn poured over several scrolls. His brow was furrowed with the efforts of his studying, and a hoof absent-mindedly brushed his mane out of his face.
“You really should trim your mane, ya know. It’s getting sorta long, Duskie.”, a high tenor voice said from above him.
“It’s none of your business, Bubble Berry, and don’t call me ‘Duskie’. My name is Dusk Shine.”, he scolded without looking up.
“Whatcha doing? Reading stuff. Whatcha reading? Boring stuff. Why’re ya being boring? Cuz you’re Duskie!”, the sing-song voice was now directly in front of him, coming from a pink head with a poofy mane.
(“Oh, hiya colt me!”)
(“Pinkie, he can’t hear you.”)
“Hiya filly me!”, a pink hoof waved.
“What?”, Dusk Shine said.
“I swear, you’re almost as air headed as my big sister.”
“Dusk Shine! Is the new Daring Don book in yet?”, a prismatic pegasus called from the doorway of the library.
“No, it hasn’t arrived in the two minutes since you asked me before, Blitz. Trust me, you’ll be the first to know when it gets here.”
“Oh, um, I also wanted ask about a book, if you don’t mind.”, a yellow head peered around the brash blue pony.
“Oh, the book about bear cubs? Sure Butterscotch, I have it right here.”, magenta magic enclosed a thick tome and levitated it to the shy stallion.
“Th-thank you, Dusk Shine.”
“Oh, my friends! It is simply awful, the worst thing possible!”
“What is it this time, Elusive?”
A white unicorn with a curly purple mane burst into the library and flung himself atop a couch, a hoof over his forehead.
“Poor AJ will never know the joys of fashion! He simply refuses my generous offer to create a new suit for him from scratch! Even after I emphasized how gorgeous he would look in it!”
(“Yer a bit campy, there, aren’tcha Rares?”)
(“Am not! I am a perfectly non-campy stallion!”)
(“Yer right. Fruity is a better word.”)
(“Why I never!”)
“I will not be forced inta some monkey suit! My pappy’s ol’ duds are just fine.”, a large orange earth stallion in a Stetson ducked his head under the door frame.
“The princesses are visiting! We can’t look like heathens!”
“Wait a second, ‘princesses’? This is supposed to be a completely opposite gender scenario!” a worried Twilight stopped the projection.
“Well, you did say that if an opportunity was possible, it would happen in another world. It’s not possible for an alicorn the be male,” Celestia said.
“What? The possibility should be fifty fifty either way!”
“Nope! There’s not a Y chromosome in our genetics,” Luna explained.
“Then how do you reproduce?”
A visible shudder went through the three alicorns.
“Oh, um, that’s a topic for another day.” the blush on the pink alicorn’s cheeks was hotter than the sun her aunt controlled.
“Yeah, it’s more of a hands on learning experience anyways.”, Luna snickered with a suggestive wink towards the purple unicorn.
“Not for you, dearest sister.”, Celestia stepped protectively between the two.
“What are they talking about?”, Shining asked his wife suspiciously.
“Isn’t it obvious? They wanna f-mmmmph!”, Rainbow was cut off by a yellow hoof.
“That’s not appropriate, Dashie.”
“Wait, what am I missing?”
“He’s not the quickest to catch on, is he?”, Rarity murmured to Cadence.
“Why are my greatest discoveries always lost in the chaos of my personal life?”, Twilight sighed, blushing rather furiously.
Ahh, this was a lot to take in, between the two princesses jealously fighting over Twilight to the whole look at the genderbent dimension to a revelation about alicorn gender that seem somewhat… familiar. XD It was very entertaining throughout, though, and I liked how the banter took precedence over Twilight’s discovery.