At Canterlot castle in Luna's room Luna was having a dream that night but it wasn't a peaceful dream it was a nightmare a nightmare for a Nightmare.
Luna was running through darkness from a shadow that was chasing her she ran like her life depended on it, she ran in all sorts of direction to try and escape but no matter what she did the shadow would follow, suddenly a big wall rose up from the darkness in front of Luna trapping her.
Luna looked behind her coming right for her and she screamed then she woke up, Luna sat up from her bed breathing heavily and sweating she looked around her room like the monster had followed her out of her own dream then sighed in relief.
Then the door to Luna's room opened and Celestia walked in, "Luna are you okay I heard you scream!?" Celestia asked worried about her little sister.
Luna nodded, "Yes I just had a bad dream about...her again." she replied with her head down.
Celestia walked over to her bed and sat next to Luna and hugged her to comfort her nerves, "Don't worry Luna Nightmare moon cant get you okay."
Luna returned the embrace and smiled, "Thank you sister I know and with you here with me I know i'll be alright." she replied.
Celestia smiled, "Good," she said happily then got of the bed and looked at her sister, "It is almost time to end the night and bring forth the sun."
Luna got up next to her sister and walked with her, she didn't have to worry anymore she was with her sister again and the pony's of equestrian have forgiven her and Nightmare moon is now no more then a bad dream and a holiday no more will she have to even think about that horrible monster again except maybe in her dreams because that all she is now...a bad dream.
Suddenly Luna felt a strong burning pain in her heart and she fell down to the floor clutching her chest, when she fell Celestia looked at her sister worried and got closer to her.
"Luna what's wrong!?" Celestia asked.
Luna looked up at her sister with a panicked look, "I-I don't know?" she said then looked at her body to her shock and dismay her back legs were starting to change instead of her beautiful dark blue coat her legs were starting to turn bitch black, "CELESTIA, I'm changing!?!"
Celestia looked at her legs to see that the dark blackness was working its way up Luna's body Celestia then looked at Luna's face that carried fear, "Luna your changing into Nightmare moon again!" she yelled fear creeping up in her as well.
Luna panicked, "WHAT DO WE DO!!" she yelled freaking out.
Celestia fear then turned to anger she wasn't losing her sister again, "We are going to get rid of her once and for all!!" she said then lowering she started to concentrate on her spell, "Luna bring your horn together with mine and will do it together!" she commanded.
Luna nodded the blackness now reaching her neck, she did what her sister told her to do a brought her horn with hers and both there horn glowed with the spell to ride themselves of the monster the spell grew stronger and stronger until the light from their horns exploded blowing everything up in smoke.
Celestia got up off the floor from the wall the explosion she looked around through the smoke for her sister until she found her splayed out on the floor out cold and ran to her side shaking her to wake her up.
Luna slowly opened her eyes and looked up at her sister and smiled then got back on her haunches and hugged her Celestia gladly returned the embrace, "Is it over?" Luna asked.
Celestia nodded, "Yes its over." she replied and hugged her sister tighter, suddenly there was a coughing sound at the other end of the room Luna and Celestia looked behind them to see something sitting in the still clearing smoke Celestia got closer until the smoke finally cleared and she could see the one coughing.
Sitting in front of Celestia was a tiny black alicorn foal her mane just like Luna's flowing like a river and covered with stars the foal even already had a cutie mark that looked liked the moon, Celestia looked at the foal for the longest unable to say anything for she knew who this was.
"N-Nightmare Moon!?" Celestia said astonished finally able to speak.
The black foal in question looked up at Celestia then made an angry scowl although to somepony else it would actually look cute, "Cewestia, I Nightmawe Moon has return to destwoy you and youw pwecious pony's!" Nightmare proclaimed then laughing an evil laugh not noticing the sound of her voice or how cute her laugh sounded.
Luna then came up next to her sister and looked at the foal, "Do you think this truly is Nightmare sister?" Luna asked.
Celestia raised a brow, "I think so Luna she looks like Nightmare and she sound kinda like her," she replied but then giggled, "although her voice sounds adorable and she looks so cute."
"Hey Nightmawe Moon is not cute you will fear me!" Nightmare yelled in furry but then she noticed how big the sun goddess was, "Hey why is everything so...big?" she asked then she noticed her voice, "And whats wong with my speech?"
Luna then levitated over a small mirror from her dress and brought it down to Nightmare to look herself over, Nightmare looked at her reflection and gasped her reflection copying her instead of a fully grown mare she was looking at a small foal with a chubby belly and tiny hooves she looked at her small hooves and felt a urge to suck on them.
"Nightmare?" Celestia said getting the foals attention, Nightmare looked up at her with a shocked expression.
"What happened to me!?" she asked.
Celestia put a hoof to her chin, "Hmm instead of destroying you it seems we managed to give you your own body outside Luna and turned you into a foal," she replied then scowled, "and now its time to finish the job!" she said then her horn started to glow.
Nightmare gasped and covered her eyes with her hooves not wanting to see her demise come so early after being freed from within luna...but it never came opening her eyes Nightmare looked up to see Luna standing in front of her.
Luna scowled at her older sibling, "Celestia I am ashamed of you trying to destroy a little foal." she said angrily.
Celestia was surprised at what she was hearing, "But Luna that's Nightmare, the one who got you kicked to the moon, the one who tried to bring eternal darkness twice and what if she tries to take you again!?" she asked.
Luna scuffed, "I don't even think she had the magic to lift you up led alone be able to move the moon to even create eternal darkness." she retorted.
Nightmare then scowled again angry for the doubt they had in her that she can bring eternal darkness, "Oh yeah I'll show you!" she said then using her magic she started to try and lift Celestia and throw her across the room but no matter how she tried she couldn't lift her she was just to heavy and Nightmare went down onto her belly breathing heavily then she looked up to see both princess with big smiles.
"Okay in my defense Celestia has a big butt making her really hard to lift." Nightmare retorted.
Celestia smile then disappeared after that remark, "Hey my flank is not big its...puffy with furr." she retorted.
"So what do you think we would do with Nightmare?" Luna asked wondering the fate of her small counter part.
"Sense you don't want me to destroy her I think it would be best to send her to the moon for good." Celestia replied flatly.
Nightmare gasped she was going to the moon again...alone in her mind she felt like crying and screaming for mercy but quickly shook her head in denial she wasn't going to humiliate herself.
Luna shook her head, "No sister she's just a little filly she wont survive out there." she retorted she wouldn't want anypony to end up there alone not even Nightmare.
Celestia and Nightmare both looked at her surprised, "Then what do you suppose we do Lu-Lu?" Celestia asked.
Luna then looked at Nightmare she knew what she had to do, "I will take care of Nightmare moon and be her caretaker."
"What!?" both Celestia and the foal said in unison.
Luna then looked at them both, "Yes it's my fault that she even exist in this world so it should be my responsibility to watch her," she said matter-a-factly and thought about something, "besides if you think about it sense I brought her into this world I'm kinda her mother."
Nightmare moons jaw was hanging from her maw Luna was going to watch her like she was a baby like she was...her daughter then she shook her head of the thoughts and emotions that threatened to come up.
Celestia franticly shook her head, "No Luna I cant let you do that, what if Nightmare does something to you what if she takes you from me again!?" she retorted.
Luna then came up to her sister and hugged her, "Don't worry sister you will never lose me again and I promise to keep an eye on Nightmare, please let me do this." she assured her looking at her sister pleadingly.
Celestia sighed, "Fine sister...you can take care of her but only if you promise to watch her closely and be careful," then they hugged each other again and when they let go Celestia smiled, "okay we better go change the night it should be dawn now."
Luna smiled then picking up Nightmare her and Celestia walked out her room to go and change night into day.
Nightmare cradled in Luna's arm pouted at how defenseless she was then she suddenly heard a bumping sound next to her in Luna's chest she pressed her ear to her chest to hear her heart beat beating steadily it sounded good to her ears in fact it made her feel kinda tired.
Nightmare didn't know why but she wanted to hear more of Luna's heart and to be close to it as much as possible she then yawned and fell asleep listening to Luna's heart beat.