We all know the Tale of the Two Sisters.
How 'Once upon a time in the magical land of Equestria, there were two regal sisters who ruled together.
To do this the eldest used her Unicorn powers to raise the sun at dawn.
And the younger brought out the moon to begin the night.'
And about how Princess Luna became jealous of everyone loving and relishing in her sisters Day while they slept through her beautiful Night.
So one night she refused to lower the moon to make way for the dawn.
Soon making that jealousy turn her into a wicked mare of darkness Nightmare Moon who had to be banished to the moon by Celestia of 1000 years.
Well... What if there was another reason why she didn't lower the moon in time for the sunrise?
And what if Celestia was only so mad at Luna for not doing it when she should - meaning the hatred and darkness built up inside the younger sister, because it had been happening for a while?
And what if that reason was because Luna was being distracted by something else?
Or rather... someone else?
Princess Luna was singing a lullaby to a little filly who was as pale as the moon with a crescent moon mark on her forehead just under her horn.
"Moonlight... starlight... darkness falls
From the shadows owls call
All this shall be yours someday
Till then sleep
Dream the night away..."
"Goodnight my little Selene," Luna said gently nibbling on the filly Alicorn's wings to show she loved her and kissed her forehead.
Just then there was a banging of a door being thrown open and Celestia's voice calling out for her.
"LUNA!"
Not wanting her daughter to wake up, or her older sister to know about Selene (she didn't deserve to know she thought) Luna placed an Everlasting Sleeping spell, meaning time stood still for the pony it was cast over as they slept, over the filly.
Then after another kiss, Luna went to see what was wrong, hoping this would be a quick conversation.
As she stepped out into the hall, she could see Celestia pacing around, every so often looking to the moon.
"Luna," she said fiercely in a form of greeting "Why have you not lowered the moon yet? This is the 5th time in two weeks you haven't lowered it when it was meant to go down."
"I was busy with something else and lost track of time sister," Luna said going over to the window to do her job, but Celestia caught her with what she said next.
"Lost track of time? You seem to be doing that a lot lately. What you think ponies will notice the moon more if its out longer and longer every night?" she asked sounding like the brat Luna secretly believed she was "What's got you so busy anyway?"
"That is none of your business sister," Luna said pointing a hoof at Celestia.
"It is my business if my ponies suffer because of it because the crops aren't growing because the sun's not getting to them to help them grow."
"Your ponies!" Luna asked yelling a little. "We are ruling this land together! Those ponies are just as much mine as they are yours!"
"You know what forget it, I should have done it myself," Celestia said moving to the window to see what she was doing.
"Not another step." Luna said coldly "Did you think I'd sit idly by while they all basked in your precious light?"
Slowly she went to the top of the stairs keeping her eye on her sister along the way saying "There can only be one princess in Equestria. and that princess WILL BE ME!"
Screaming this Luna brought her hooves down onto the railing smashing it to pieces.
Then all the hatred and jealousy and stress for caring for Selene that had built up over these last few months came out of the bottle, surrounded her, and turned Luna into a mare of darkness calling herself Nightmare Moon.
A battle and a banishment to the moon later, Celestia placed the stone Elements of Harmony back onto the stand and left.
Nopony knowing of the little filly that was soundly sleeping in a room just down the hall, who would stay asleep until her mummy came to wake her up.
Chapter 1 Finding the Baby
After Princess Luna had come back 1000 years after her banishment to the moon, and after she was back to full power, the first thing she wanted to do was go back to their old castle in the Everfeee Forest and look for Selene.
Unfortunately her new share of Royal Duties, and Dream Watching, got in the way and she was always too tired in the morning to remember to go look for the filly.
"Tomorrow..." she kept saying to herself "Nopony has found her yet. She will be alright one more day."
Getting into her own bed in the Palace of Canterlot, Luna went to sleep for the day yawning a little.
Down in Ponyville Twilight Sparkle, her number one assistant Spike, and their friends, Pinkie Pie, Rarity, Applejack, Rainbow Dash, and Fluttershy, were heading into the Everfree Forest towards the Castle of the Two Sisters to try and tidy and clean the place up a bit.
"Ok everypony," Twilight said as they entered though the front doors "My plan is to spread out and we all take a different room to start cleaning. We will come back into here in a couple of hours for a break."
Agreeing the other ponies did that but Spike just wanted to read his comic book which he brought along.
Going deeper into the castle than he did last time, Spike came across a room with a crescent moon on it.
"Probably Princess Luna's," he said to himself pushing the door open and looking inside into the dark room.
Looking over his shoulder to see if the others were watching, Spike took a candelabra from a window stand and lit all the candles with his fire before going in.
What he saw inside confused him a little.
If this was Luna's room, when why was it full of baby filly things all covered in dust and cobwebs.
Well, the dust and cobwebs were obvious yeah but not the baby things.
Seeing a crib, Spike went over to it and looked inside reaching out a shaky claw and pulling the blanket back...
Spike's scream could be heard all down the hall making everyone stop drop their cleaning supplies and ran towards the room he was in.
"Spike!" Twilight called as she ran towards it running into him as he ran out of it afraid.
"Luna! Baby!" he said panicking and pointing into the room "Baby Luna!"
"Um... did you hit your head or something Spike?" Rainbow Dash asked always the one to speak up about things like this.
Shaking his head and too freaked out to speak, Spike starting pushing and shoving Twilight into the room and towards the crib.
"Spike! Stop!" she said stepping forwards making him fall over.
"But Twilight look!" he said pointing.
Everypony did look and everypony's eyes widened when they saw a sleeping baby alicorn in there.
"What makes you think it's a baby Luna, Sugarcube?" Applejack asked wondering if it would be wise to pick the foal up.
"The door had a crescent moon on it," Spike said a little calmer now everyone was there, but still staying his fair distance away.
Everyone looked to the door.
Yes indeed, there was a crescent moon on it, but instead of being the moon they were all familiar with to be Princess Luna's, this one was on it's side with the tips sticking up, just like the mark on the foals forehead.
"I don't think this is a baby Princess Luna, darling," Rarity said pointing these details out.
"The name on her blanket says 'Selene'," Fluttershy said quietly.
"I wonder why she's not woken up, I mean after all the noise Spike was making, I doubt even I could sleep though that!" Pinkie Pie said bouncing a little.
"I don't know," Twilight said getting order back into the room "But I think this is something we should write to the Princess' about "Spike?"
Spike already had some parchment and a quill ready.
'Dear Princesses Celestia and Luna'
She began surprising everyone that she was writing to both Princess'.
'Today as my friends and I were tiding up the Castle of the Two Sisters, Spike came across a room that appeared to be made for a filly.
And inside, in a crib was a baby Alicorn with a blanket saying her name was 'Selene'.
We have tried waking her up, but nothing is working.
Looking forward for your reply
Princess Twilight Sparkle.'
After everyone agreed that that just about summed it up, Spike sent the letter on it's way in a puff of green smoke.