On a tower balcony in Canterlot stood Nightmare Moon. What was once the visage taken by Luna to showcase just how far her jealousy had pushed her, is now under a different use. This Nightmare Moon is much different than the old one. Now, instead of being a monster born of anger and jealousy, she is a guardian of the tinies, spreading fear and terror among those who seek to harm them. There is also one more thing that separates her from the old Nightmare Moon, being that she isn’t Luna at all, nor a living shadow.
She had once been a young pegasus named Glitter Dust, the cousin of Lightning Dust, who had applied to the Wonderbolts, and so in similar fashion, she had attempted to join the Lunar Guard. She, unlike Lightning, had got in and served proudly. After the tinies had shown up, things had changed a lot. At first, there wasn’t much to be concerned about, at least until “The Tasting” and then everything went haywire. Practically overnight, not only had ponies begun gulping down their tiny companions, but an entire crime syndicate had been set up around enslaving and selling tinies.
Being in the guard, she was there to see first hoof the reactions of the Princess’, who were shocked, horrified, and outraged that their own little ponies could do such a thing. Celestia called for more Royal Guard patrols during the day, and at night, the Lunar Guard would patrol.
That was when her life truly changed. She had been on patrol in one of the poorer portions of Canterlot, crime had a tendency to be pretty bad in those areas, but of course, after hearing what crime was like where the humans had come from, suddenly the area seemed like a paradise. However, with the new tiny trafficking, it was a likely place to investigate. During the patrol she stumbled across a couple newcomers, two young children named Dan and Kate. Kids, mostly those middle school and below, were the most preferred captures of the traffickers, and especially in the area, the two were targeted fairly quickly by both her and a group of snatchers.
Luckily for the two, she was a bit faster and had managed to get to them first, swiping them more like a pelican than an eagle, and taking off with them tucked away in the one safest of places technically speaking. Unluckily for her, the snatchers hadn’t taken too well to that, and the unicorn among them got off a lucky shot, which sent her tumbling across a few rooftops and crashing in an alleyway.
Finding herself unable to get up, she laid there, waiting for whatever came next. A couple of voices sounded out and she had closed her eyes in dread. However, the group that found her were not tiny snatchers, but a couple of Lunar guards. They carried and took her to the Canterlot Castle’s medical wing, where her life got worse. The impact had broke her neck, though they’d stumbled upon her in the nick of time; she would be paralyzed for the remainder of her days. The two children had fared much better, though their ride had been a quite rough and, being new, were incredibly fearful of the giant ponies and where they were in. Apparently, they’d actually figured out that she’d saved them, and stayed with her. They helped her to do things that she could now no longer do on her own. Then, a new change came into her life, that flipped her world back over, though in an unexpected way.
Luna had been overseeing a lot of the operations of the Lunar Guard herself and formed a new division to attempt to keep up with the new arrivals, and to make life tougher on the tiny snatchers. Her problem quickly became the fact that as another Princess of Equestria, she couldn’t always go out there herself. So she needed somepony who could, but they couldn’t just be anypony, they needed to be able to be a good replacement for her. That’s where Glitter Dust came in.
“Princess Luna! I-I would salute, b-but…” Glitter started
“Worry not, I know the circumstances." Luna returned sorrowfully. "I apologize that this happened-”
“No, you don’t need to do that.That’s all a part of being in the guard. I-I’ll get through this, especially with Dan and Kate…”
“I can see that, you seem to have bonded very well with them.” She said with a smile. “However, you didn’t let me finish. I have a situation. I have a new group to help with keeping the humans out of these criminals’ hooves, and I need somepony to head it when I’m busy. This is where you come in.” Glitter tried to interrupt, but Luna prevented it. “Let me explain, this situation calls for me to be in two places at once, but I obviously cannot be, so I need somepony to wear my shoes so to speak. In my efforts, I came across a useful spell, one that not only provides for my needs, but also for yours."
“This spell, will physically transform you fully into my alter-ego, Nightmare Moon. This will not only allow you your full faculties again, but a few extra, and with a few personal lessons I can get you up to speed. However, there is a catch: once the change is complete, you cannot go back. You will be Nightmare Moon forever. You’ll be given living quarters in the castle, and will be considered ‘under reformation’.”
“I...But…” Glitter stuttered, not knowing what to do.
“Don’t worry, I will take care of Dan and Kate while you’re gone.” Luna said, smiling. “I’ve heard about the adoption. This is why I decided to give you the offer. Dan and Kate are lucky for you to stumble upon them, however, there are many more tinies out there that need help, and even more, many of them are children like them. I would go myself every time, but I also need to be there for my little ponies as well.” Luna says with a pleading look on her face. “What say you?”
Nightmare Moon turned and went back into her room. She stopped to look at herself in the mirror; she was nearly pitch-black, with the exception of her flank and cutie mark. While she wasn't in the blue armor, her mane was still flowing, despite for a lack of wind. It is still so strange, being Nightmare Moon, the other princess of the night.
As she cantered, she stopped, smiling a bit as she heard her two favorite voices in the world. She turned and made her way to the small open roof bedrooms she made for the two tinies. She saw them standing next to each other, shivering outside of them. “What’s wrong?”
“A-are y-you staying home tonight mommy?” Kate asks. Nightmare carefully nuzzled her.
“Yes, mommy has tonight off. I can’t imagine what ponies would do if Nightmare Moon were to come flying around on Nightmare Night, and it wasn’t Luna.” She replied, leaning closer. “But why are you two out of bed?”
"We had a bad dream, Mommy!” They both answered.
“Aww...” Nightmare cooed, lifting them to her chest and wrapping her massive wings around them in a hug. “Shhh shhh shh, mommy’s here, you don’t have to worry. You two wanna sleep with mommy tonight?” She asks, giggling a bit when she feels them nod their heads. “Do you two want to sleep in mommy tonight?” She giggles even more when she feels them nod their heads again. “Alright, mommy’s gonna tuck you two in bed, ready?” She asks raising them to eye level. She watches them nod once again and she gently sets them down on her tongue.
The two kids look around the spacious mouth of their giant, giant mom. She’d been big before as a regular pony, but now she was huge. They don’t mind however, being used to her new form, as terrifying as it is, especially how her teeth resembles like that of a shark's. She tilted her head and swallowed the two, feeling them slide slowly down her massive throat, not even appearing as bulges on the outside. Eventually they land in her stomach and curl up near the front, rubbing her back as she rubs them.
The liquid inside her stomach glowed a strange blue, lighting up the walls of her massive stomach. The wrinkled walls expand and contract slowly, liquid drips from the top, making loud splashes. Her heartbeat and breathing accompany the strange symphony of gurgles, groans, and swishes of her stomach digesting earlier meals. After a moment, a new sight replaces that, as the roof of the stomach vanishes, being replaced by a night sky illusion.
Curling up carefully on her own bed, Nightmare Moon/Glitter Dust, listened as the two fell slowly asleep, before she joind them in the dream world, bonding with them further.