Mother to a killer

That night, like many nights following Nightmare Moon's banishment, Celestia was at her window looking up into the night sky. It had been many years since Luna had lost her mind and tried to make the night eternal, yet for Celestia the memories still burned deep within, making her question if what she had done was right.

Looking up, the moon began to appear from beneath the clowds, letting Celestia wonder which voice she would hear tonight. As all clocks in the kingdom chimed midnight, Celestia waited, waited for the cries, the screams, the threats and the curses to shatter the silence of the night as they did most nights.

However apon this night an new sound was heard, not the sobbing apologies of Luna, or the angry ranting of Nightmare Moon, but something soft, small and looking for comfort, it was the unmistakeable cry of a newborn foal.

At first Celestia considered it a cruel trick, planned by Nightmare to get her to release her, but as she listen on she heard different, as the newborn cried she could make out the sound of soft cooing. As the foal began to settle and some silence returned so many questions ran through Celestia's mind, how was a foal on the moon, was it Luna's, how'd she get pregnant, and so many more.

For hours Celestia just sat there, listening to Luna comfort the newborn in a motherly tone, she sounded so soft and loving, she sounded just like her old self, Celestia wondered if this had done it, if this newborn foal had allowed Luna to gain control, to fight the nightmare within.

With a smile on her face Celestia listen closely, hearing the small squeaks of the foal and Luna's comforting tone, however as the newborn began to stir it let out a ear shattering cry, causing even Celestia to flinch, but as bad as that noise was, it was nowhere near as horrifying as the sound that followed.

"YOU FILTHY LITTLE VERMIN, HOW DEAR YOU BE NEAR ME, I'LL MAKE IT SO YOU NEVER TOUCH ME AG..."

"STOP!!!!!!!" Yelled Celestia, within a flash of light, appearing between the small crying foal and Nightmare Moon, acting a shield from whatever she had planed to do.

"WELL, WELL WHAT BRINGS YOU TO THE MOON CEL... CEL..."

"Celestia," cried Luna, finally breaking free of Nightmare Moon's control.

"It's ok sister," Celestia said with a warm hearted smile.

"No, no it's not, you know what I... What I almost did, I can't... I can't stop her, I'm... I'm just a... Just a monster," breathed Luna between sobs, "he... He can't stay here, please take... Take him back with... You."

"He?" Celestia puzzled before looking round, there one the ground, still crying, was a deep blue, black maned, alicorn colt. Picking him up with her magic, Celestia brought him close, rocking him gently, allowing him to fall back to sleep.

"He's beautiful Luna," said Celestia, wiping away tears, "oh my, I have so many questions,"

"Please Tia, take him... Take him away, away from me and my... Prison," Luna begged, crying once more, "he deserves... A chance at life, just... Just promis me... Promise me one thing,"

"Whatever you want, dear sister,"

Luna began to shake, her breath becoming ragged, Celestia know she was fighting Nightmare Moon's control and it looked like she was losing, "Hide him, hide him... From me, from the... Truth, never tell him... I'm mother... let him... Normal life... No hate... From others... Don't tell... He's my son..."

"Very well sister you have my word," at this Celestia placed the foal on her back, lit her horn and began to teleport home, however just before she did she asked her sister one last question, "what's his name?"

Luna by this point was gone, Celestia could see she had lost control, however she managed to croke out one last word "Midnight," and with that, she let out an almighty scream, as she became lost in that madness that was now her very soul.