Twilight squirmed under the situation she was in, the room was Celestia's chambers as where she normally held these meetings with Twilight. Celestia being the one to insist on it to be 'less political' and 'show friendship as equals' and Twilight absolutely had no problem with it...until now.
There was a coffee table between Twilight and Celestia with both being the opposite of the other. Today was no regular tea party, Twilight had a burning question in the back of her mind that she always wondered about but never found the time to ask. Especially with her and her friends constantly taking down villains and personal life problems, she just could never find the time in her and Celestia's schedule to truly ask. Until now that was, Twilight's squirming however didn't go unnoticed as Celestia had been sipping her tea patiently giving her used-to-be student enough time to process her question.
Celestia had finally put down the cup of green chamomile tea with a sigh. "So, Twilight what is it you have in mind?"
"H-huh? What? Did I say something?"
Celestia had to hold off from rolling eyes in amusement before continuing with a smile. "No, but I've known you long enough to know when you have something on your mind. So please, tell me - I can be pretty good at keeping secrets." Celestia had ended her prodding with a wink and it seemed to have calmed Twilight's anxiety quite a bit.
"W-well it's just..." Twilight bit onto her bottom lip, thinking of ways to properly formulate her sentence.
"'It's just'?" Celestia knew she had to push Twilight a little more or else she'd stay there for millennia.
"Well- uh, how do we become Alicorns?"
Celestia had tensed at that before picking up her teacup with her magic. "Pft please Twilight, you as any other pony should know one does not just become an alicorn." She sipped back at her tea.
"Well yes but, how did Flurry heart become an alicorn from birth?"
Celestia immediately choked on her drink and began to cough out in excessive amounts.
Twilight called out in worry "P-princess!" She quickly got up for action on the table. "Are you okay?" Twilight had reached out to her mentor but Celestia held a hoof up to signify she was fine.
With a few more coughs out she had recovered her composure and smiled, "I'm so sorry to scare you like that Twilight b-but you must remember that even I don't know of it."
"Well yeah, but it still doesn't explain how and why, I mean I've searched through all the books I could find that were related to this and I found nothing!" Twilight had been pacing around her small area of comfort from her side of the small coffee table.
"Erm- uh I may actually know, Twilight may I be honest?"
Twilight had stopped her pacing as soon as Celestia had spoken, "O-of course princess, b-but why keep this a secret?"
Celestia had held some air, a thousand years of holding it all in before letting it out in a sigh.
"Please sit down."
"O-okay."
"This is going to be somewhat devastating and I need you to promise me you will not look at me any differently."
"I- of course, princess!"
Celestia sighed once more, somehow heavier than the last one. "Me and Luna well," Celestia was in deep thought of what to say next, "there's a liquid substance that actually ascends us to alicornhood. You recall that drink you drank that you told me later in your report, the one where you saw past memories that weren't your own?"
"O-of course! But uh the drink couldn't possibly be the only catalyst I mean there's no mention of it before and there's no way ponies could just not know of something so powerful."
"I-" Celestia was conflicted in the next sentence she was going to speak about. "You're correct that there's no real mention of it, and for good reason. It's Discord..."
"Discord can make a substance that turns ponies into alicorns? Surely your joking right?"
Celestia shook her head.
Twilight had brought out a notepad and quill, "Fascinating, so how does he make it? What is it made out of? What kind of magic is it? Is it harmonious with chaos? How much are the proportions of the magic? Ho-" before Twilight could ask anymore Celestia had shut her mouth with her magic.
"I don't think you understand Twilight - me, Luna had a sort of-" she waved her hoof to find the word for it. "Fling with Discord, and well that came to the results of us ascending."
Twilight was still lost, "I still don't understand."
Celestia face hoofed, she couldn't blame Twilight, she was much more naive than others. "We-" Celestia had brought her hooves up to bump each other. "Hit the barnyard."
Twilight had turned her head to the side, "I still don't understand."
"We trotted till dawn," she still saw no show of understanding on Twilight's face. "Made the moves under the blanket of stars? Ride on the pony? Made like the spoon and the plate? Had a co-OP mode?"
Twilight still didn't get it and Celestia was feeling more embarrassed about the whole thing.
"Twilight when a mare and stallion love each other very much what do they do?"
Twilight was puzzled by the sudden asking, "go under the sheets and make a foal obviously! But what does that have to with-" before Twilight finished her sentence she finally connected it together.
She slowly widened her eyes and bugged out in realization of what it all meant. "No- Princess you- please tell me you didn't-"
Celestia looked away with shame and blush at a maximum force under her white coat. "It was a fling I swear!" But when she spoke she looked around the room to avoid anything of this subject.
"O-oh Faust," Twilight was starting to feel nauseous from the very thought that Celestia would- "Wait, Luna too!?"
Celestia still looked away, avoiding Twilight's eye contact.
"O-okay ignoring this which I definitely DIDN'T need to know, how does this relate to the substance I. Drank. Oh. My. FAUST!" "...Celestia please tell me I did not drink-" she gagged at the thought of it was all true.
Twilight begged that it was all a lie that she didn't drink that unknowing what it was but all Celestia gave was silence.
"...OH COME ON!" Twilight stuck out her tongue and gagged at the idea it was at all in her mouth and teleported soap and a scrubber just to wash and scrub away any traces of the liquid.
After a bit, she stopped cleaning her mouth for a bit to ask a daring question. "WHY? HOW? HOW DID I GET MY HOOVES ON THAT?! Wait...WHY DID ZECORA HAVE THAT!?" She started to stamp her hooves on the ground repeatedly and started rinsing and scrubbing again.
Celestia finally took pity on Twilight and explained. "Well, actually I gave her it to give to you. My plan was always to make you a princess."
Twilight had stopped scrubbing to give Celestia a stare that would kill if it could. "You did WHAT?! WHY? IF I KNEW WHAT WAS IN THERE I WOULDN'T HAVE DRANK IT AT ALL!"
"Which is exactly why I didn't tell you!"
"Wait wait wait, that still doesn't answer my question, HOW was flurry heart born an alicorn?"
"Well-, the liquid doesn't necessarily have to be drunken and Cadence isn't a princess of love for nothing..."
"..."
"If it helps, Shinning rather liked the idea and participated..."
"..."
"Twilight?"