King Sombra's Harem Conquest

The king sat on his throne and contemplated the situation, fighting down the urge to scratch his wound. By now, reports were arriving that a not insubstantial relieve force was mustering in Manehattan. The siege had to be ended soon.

His most trusted servants were arrayed In a half-circle before the throne. Each of them provided ideas how the shield might be circumvented in time. Some were more useful while others, like Pinkie's suggestion of a trojan partywageon, were less so. Through all of this, Twilight had been suspiciously quiet, and hidden behind her magical wings. Apparently, she had been whispering to her father, however.

Finally, she spoke up: "Your Majesty? If there is one pony that can match Celestia... it is her own sister! The mare-in-the-moon! Princess Luna... Nightmare Moon!"

Applejack's ears perked up and she looked at Twilight. "But she was banished to the moon, wasn't she?" The summer sun celebration where Nightmare Moon had returned had been held in Ponyville, and so AJ and her family had had a front row seat to that fiasco.

"Re-banished, yes," the unicorn admitted. "but if she could escape once, maybe could bust her out! She knows Celestia better than anypony here, and she is an alicorn herself! Her strenght, even if she isn't equal fo Celestia's, would be a valuable addition!"

"She will try to betray us." Radiant said, entering with Fluttershy while carrying their foals. They had overheard the last few pieces as they had neared the curtain

Sombra was contemplating the suggestion. He had heard stories about Luna, both when he had been young, and the stories newer – but had only come into the Crystal Empire via a chain of ponies 'having heard about' – and when he had returned, the stories had become legends, told to fillies and such.

Princess Luna had felt slighted and unappreciated by her subjects, something that Sombra could relate to on some level. She had made a deal with an evil power to gain the strength to stand up to her older sister, and become Nightmare Moon. They fought, and she lost to the power of something called "The Elements of Harmony", though apparently they had lain dormant ever since. During her return, she had managed to imprison Celestia, but she was still weakened from her exile on the moon and so her older sister, with some help from Princess Cadance and Captain Shining Armor had been able to send her back.

"Very good! Twilight! Get Starlight and Begin with the preparations! Take what you need, recquisition all the aid that is necessary!" In quiet, Sombra contemplated what to do with her and her sister later... Sure, their powers, and Celestia's knowledge, would make them very well suited for an active role in the field, but something made him question that. Maybe it was just greed, his desire to dominate, but he had something special in mind for his enemy, and her younger sister...

In her private chambers, Princess Celestia stared at her image in a mirror. It was herself, just as she stood there. But before her inner eye, she looked at somepony else. Somepony very different. Different, yet the same. In front of her, the princess looked on her own darkness taunting her!

She saw the crowned red-and gold helmet around her on her head and around her horn, wreathed in the fires of her mane, saw the blazing eyelashes above her eyes like magma and the fangs of her muzzle, twisted into an arrogant, evil, sadistic, psychotic smirk!

Beneath her head, she beheld the little protection she deigned to need: Each of her shoulders was defended by a pauldron with a sun-shaped besagew in front of her armpit.

A red metal, split into three and with a blazing sun engraved on it, stretched down from her neck! One prong was nestled between her breasts, the other two bands were a broad metal band covering her nipples! Beneath her tits, the three pieces flowed back together again, ending in a point that seemed to guide an onlookers attention to her pussy!

Around her hips, she wore a short half-skirt, leaving the front open for easy movement. Something which looked like thong armor covered her privates and armored boots reached up to her thighs, giving them a dangerous yet tempting framing.

When Celestia had fought King Sombra, she had tapped into this power, and the experience of giving into her fury had badly shaken her! Almost... almost she had turned into a force she knew was more than capable of stopping Sombra and, maybe, even all of his forces and henchponies... But at what cost? If she unleashed this power, gave in to its temptation... If she proved unable, or, ultimately, unwilling, to seal it again... She would become something worse than King Sombra or Nightmare Moon!

Her dark side. The temptation of finally cutting loose, to no longer hold back her powers, to give into her most base desires! To become... Daybreaker! Princess Celestia knew: if she opened this door just a little, especially with nopony to pull her back, she would be consumed by the burning passion. Sombra wanted to rule... Daybreaker? She too wanted to dominate! But what if she grew bored of ruling and finally elate only in destruction!? Would she burn the world? And what then? Maybe she'd keep a personal harem around? There was the mirror... Daybreaker would find a way to use it and either conquer, or burn, whatever world, or worlds, she came upon...

No. Even if this power could end the war then and there, the risk was too great. Equestria would have to brave... No! Would brave this challenge without it!

After two days, the preparations to free Nightmare Moon were complete. All they now needed was a full moon! And as luck would have it, this night? This night was a full moon! They had prepared a summoning circle, infused with the king's magic.

And now, at midnight, Twilight and Starlight began their summoning. The two, plus Sombra and Radiant Hope, stood around the circle, one pony north, south, east and west! Their magic combined above the circle and turned silver. Ominously, it proceeded to form a sort of cage around its borders.

A few moments later, a ball of darkness hit the ground! Swathes of shadow poured through the bars of light. When they receeded, all that was left was a stunning, dark-furred alicorn, clad in blue armor. Or at least something very fetishistic that might somewhat approach being called "armor"! Nightmare Moon's head and neck were covered in a skull cap with a hole for her horn! Her arms were covered up to her shoulders, including pauldrons, and her legs were armored up to her thighs. But her torso was left very unprotected! She wore something that almost looked like a corsett. If corsetts were open to the front! Both of her breasts was covered by what semeed like three metal claws swooping up from below, making it look like they were being grabbed. Her nethers hidden from sight by a half-skirt like Twilight's, together with a very expensive looking loincloth, dark and covered in stars.

"I HAVE RETURNED!" She announced in a voice so loud that it almost felt like it shook the surrounding area! "NIGHTMARE MOON IS FREE AGAIN! AND THIS TIME, NOPONY, NOT EVEN MY SISTER, SHALL HINDER ME!" Then, she noticed what was going on around her, and continued in a more reasonable volume: "Who are you? What do you want?"

"We are the ponies that have freed you." Twilight replied, trying to hide a little smile. It had actually worked! She had been confident that it would, but at the same time, she figured it was at best a 50/50 chance, since she had no idea how the magic Celestia had used for the banishment worked!

Obviously, the former princess' ego didn't take too well to the insinuation of having needed help: "Freed me? I have escaped on my own!"

"Look around, please!" A strong, deep, very confident voice came from behind Nigthmare Moon. Obviously a stallion. And if she could judge by the voice, a pony that would make for a very pleasant partner... or a very unpleasant rival. Well, she would not give him the pleasure of turning around to look at him just yet. Later, when it wouldn't look like had made turn around. "You are in the center of a magical circle that we used to call you back from the moon." She barely moved her head to take a look. Indeed, there was a magical circle.

"For your first escape, the stars aligned. It would have taken another thousand years for that to repeat, or longer!" The alicorn's eyes now fixated on Twilight, as if only now deigning her worthy of her attention. Seeing how the mare-in-the-moon looked at her, the unicorn, even empowered by the alicorn amulette and King Sombra, felt a shiver run down her spine! There was something incredibly greedy and possessive in it.

Nightmare Moon licked her lips. That unicorn looked like a tasty little morsel! Oh, she wanted to have her! Celestia had managed to banish her back to the moon before Nightmare Moon had even had the chance to start looking at stallions and mares for her harem! Her dear sister had no idea how pent up you were after a millenium on the moon...

Almost imperceptibly, she swallowed a little before she continued, "My assistant and I worked the last few days to create this spell. On the orders of our ruler, King Sombra." Twilight gesticulated at the stallion behind Nightmare Moon.

This time, she turned around. Slowly, and as if the title of 'King' didn't mean anything to her. His looks certainly convinced. Maybe, once she had her revenge on her sister, he would fall to her? "King Sombra, I presume?"

"Indeed, Princess." The smile on his face was a weird mix. Half-smug, half-charming. His voice carried with an easy confidence of somepony who always got his way. And who knew how to get his way if the other didn't just want to acquiesce. And indeed, he was quite handsome! Certainly a pony to keep in mind for later... "I had Twilight Sparkle summon you back from the moon to offer you to work for me."

Twilight Sparkle was her name? Certainly a fitting one. "Why should I work for you? I am Nightmare Moon! Princess of the moon! Ruler of the Night! And the true ruler of Equestria!" The last one, she spat out in vitriolic hatred of her older sister!

This time, his voice was far less cordial. "Because, for one, we could banish you back to the moon right now."

"I was able to wait out 1,000 years!" Nightmare Moon scoffed! "I can stomach another millenium if I have to!"

"True," Sombra's voice was devoit of any emotion, "or you could stay in Equestria and work for me to get revenge on Celestia."

The ancient mare raised an eyebrow. "What is your business with my sister?"

"She is an obstacle that I want to eliminate. And since you know her like no other pony and have powers to rival her own,..."

"Why should I help you?"

"Because twice you were unable to defeat her on your own. We considered it a reasonable proposition to offer: Help us and get your revenge."

"What would you have from that? I doubt you would free me without wanting something for yourself out of it."

"Celestia would be gone. And you, if you accept my deal, would work for me."

Nightmare Moon broke into hysterical laughter! "You upstart! Why should I work for you once my sister is gone?!"

"What would you do if you beat her?" He countered.

"Banish her to the moon! And then, I will show the ponies to beauty of MY eternal night! They will learn to love it!"

"And after you plunged the world into eternal night? What then?" Twilight shot back! In her mind, there was a massive flaw in the princess's plan that any sane pony should have noticed! "Sooner rather than later all the plants would start dying off. And that would, by extension, mean all ponies, maybe even all life, would die!"

"I will use my magic to keep them alive!" Nightmare Moon replied, spinning around! The young one had fire! Even better! It would be fun to break her in... Apparently, this king wasn't great at making his subjects obedient little things...

"Until the exhaustion does you in. Even an alicorn as powerful as you would fall to fatigue sooner or later! And then everything else would start to die! Not to mention the psychological effects of an eternal night!" Like depression...

This sort of foolish contriarianism annoyed the princess... "Alternatively, I could fly off, go and help my sister and then turn against her! Or find pawns elsewhere!"

"That would mean that she would have to trust you first! Also, do you have any idea where we are?" King Sombra's sardonic laughter sounded like mockery to Nightmare Moon! "We are standing in front of Canterlot! It is under siege and Celestia is holed up in her castle! And you won't be able to leave the summoning circle until we allow it!" Now, his voice turned ice cold: "This I offer to you: Serve me! Get revenge on Celestia... and become the ruler of a vasallized Equestria!"

Hearing that, Nightmare Moon took a closer look at the city behind the self-procclaimed king! It did seem to be Canterlot, though she hadn't seen it in a thousand years! And indeed, there was a castle now. It seemed like two huge magical forces were at a constant struggle around it... "And what if, say, I were to go against your wishes? What could you do to stop me?" She asked, apparently honestly contemplating the offer. Inside, however, she was fuming and already planning a way to turn everything against this upstart ursurper! As if she'd serve some self-proclaimed wannabe king! This world was hers to rule! Hers alone!

"Nothing. Well, nothing except to wage war against you, like I am doing against your sister right now." It was a blatant lie, but she didn't need to know that. None of the others did.

Tooherself, Nightmare Moon had to admit that this was probably the best deal she could hope for. It would certainly beat being sent back to the moon again! "Alright..." She faux-grumbled. Sooner or later, she would find a way to turn everything on Sombra! Well, now it was time for the fun part... She pointed at Twilight! "But I want her as part of my reward!"

"An acceptable condition. Twilight will start working for you tomorrow afternoon. Until then, I still have a few things she has to do for me."

Twilight was shocked at how he had just traded her away! As they left, and Nightmare Moon took flight to take a look at how Canterlot had changed since her banishment, she turned to Sombra and pleaded with him! "Your Majesty! How... how could you just pawn me off like that?! Have I displeased you?"

"Twilight, Twilight, Twilight..." Sombra shook his head, slightly amused. "You don't really believe I would give one of my best slaves away just like that? One carrying one of my children at that!" He gently cupped her face and stared into her eyes. "I expect that Nightmare Moon would try to backstab me sooner or later-..."

"I'd never allow that!" She quickly reassured him!

The king began to grin dangerously as he whispered: "I know. But I took precautions. When you cast the spell, I added a generous helping of my magic. Not just to assist the summoning, but to add a little... extra."

"Oh... Clever! I should have thought of that!"

"I expect that, around the time we are in control of Canterlot, Nightmare Moon will be a submissive slave. Or at least very close to it, needing only a little push. Maybe we will even see her original personality. Wouldn't it be nice to reconnect two estranged sisters as my pets?"

"My king... you're making me sooo wet right now." Twilight cooed in amusement.

"Then let's have some fun tonight," He suggested, gently rubbing over her belly, "before you start serving Nightmare Moon... for the time being."

Three days later, Twilight was happy that the siege would soon be over! Attending to the power mad alicorn's whims was not a job the science and magic-research minded unicorn appreciated. At least for now, she was being used like a maid! Also, Nightmare Moon had shown an unhealthy obsession with when she was going to give birth... Either because of her body, or because of the potential of the foal... Then again, Sombra would most likely demand his child back anyway... Twilight had a feeling that the former princess that it was the former anyway. Nightmare Moon wanted her, maybe as a good little pet...

Well, soon she'd be diappointed. Very soon, Twilight grinned to herself. King Sombra had recovered enough to get active again, the wound still hurting, but having healed up. Tonight, it was time for the final assault!

Nightmare Moon's knowledge of her sisters' mind had been a valuable asset to the preparations, though it might not have been needed after all! The shield seemed to have weakened further, retreated a little... As it was now, Twilight, Starlight, Nightmare Moon, Radiant Hope and King Sombra would focus a magical blast on a part of the shield. It should create a hole large enough for at least part of the king's forces to pass through before it could recover, and once the princess was engaged in combat, she soon would have to decide if she was to fight, or keep the defensive measures up!

Now, it was time. Sombra's forces were lining up at the base of the shield. Tempest Shadow was in overall command of the troops. Rainbow Dash lead her fellow pegasi, ordered primarily to keep the nummerically superior equestrian pegasi in check. Twilight, who had given them a detailed description of the castle's layout, and Starlight would lead one of the contingents, Applejack and Big Mac another. They couldn't split up too much.

The plan was very simple: Sombra and Nightmare Moon would gun for Celestia. Lob off the head, and the body dies. The others, in the meantime, would cause chaos, bind reinfocements and just generally try to keep as many ponies from escaping, or trying to escape, as possible!

Sombra, Twilight, Radiant Hope and Nightmare Moon prepared to unleash their combined magic against the base of the shield! After a few moments, a hole began to open! This was it. The endgame. If they failed, if they misjudged Celestia's strength and the strength of the forces behind the shield, even if they escaped, they would take a serious lashing, if they could escape at all If they won, the war was as good as over.

The troops hurried through the opening, before it began to close again. While they were ordered to cause chaos, they were under strict orders not to destroy too much of King Sombra's future property. They had chosen a spot that was close to the castle and would avoid much of the populated, overcrowded part of the city that was protected by the shield. The later they'd be noticed, the better.

Once the fighting began, they knew, many of the ponies outside would do their best to surge into the castle to help the defenders. It had to be quick.

And the stealth would end about now. They had reached the castle walls. They had been built with representative function as a primary concern, rather than their defensive value, but they still were broad enough for three ponies to walk shoulder-to-shoulder on them, with room to spare! Letting out an evil cackle, Nightmare Moon volunteered to blow a hole into it. The first little step towards her vengeance on Celestia.

Her horn flashed, and moments later, a large explosion blew a hole into the wall! AS the dust settled, Nightmare Moon laughed maniacally, screaming "CHARGE! CHARGE!!! LET'S SHOW MY SISTER!!!"

Twilight rolled her eyes. Ham it up some more, she thought, annoyed. No wonder Celestia beat her twice, if that was how she always acted. Probably was too busy cackling and shouting to fight her off...

As they poured onto the castle grounds, the troops split into multiple groups. Most of the pegasi took to the air, but a small number remained to be distributed to the other groups. Tempest Shadow lead the main part of the force towards the throne room, drawing as much attention as they could. Big Mac and Applejack focused on another area, and Twilight and Starlight would take care of the archives and library.

It was impressive how quickly the defending forces rallied, with even the staff joining in.

Letting their unit, in their masked helmets and armor, run wild, Twilight, her father, Starlight, and a small guard unit, strolled through the corridors. Night Light himself had been stuffed into a full suit of armor, minus the face mask, and a modification in the groin area. He still had a chain around his neck, however, with which his daughter led him. Twilight had decided to keep him as her bodyguard, at least until everything was over. If she was being honest, she was looking forward to a future of quiet servitude to her king, and magical research. She would get the glory she had craved, and a peaceful life with her family. Her old, and her new family. At least until the next war came, which it would sureldy do. But for now, a little vacation was just right.

Then, she saw a very familiar face at the head of a small guard squad, hurry down the corridor towards them! She grinned and, amused, yet with more than a hint of malice, she greeted her former companion: "Hello, Moondancer!"

Moondancer was almost speechless when she realized that her former compatriot, and even friend, stood in front of her. With an armed squad. "Tw-Twilight?!"

"Huh..." Starlight chuckled, taking a good look at hte other unicorn, "when you told me about her, I didn't expect her to be so cute!"

"Who-who's that?" A shiver ran down Moondancer's spine as she heard the other unicorn talk about her like that. Her guards pushed forward and formed a protective wall.

"Starlight Glimmer?" Twilight shrugged "Basically... Your replacement. She is doing the same things for me that you did, and more."

Ouch. That one stung. Moondancer had thought that there'd been a genuine friendship between them, and that Twilight had valued her contributions. "Are you pregnant?"

"Yeah. With King Sombra's foal."

"A cute, little wallflower!" Starlight turned to Twilight... "Maybe we should help her bloom later?"

"I like the idea. Hey! Moondancer! If you want, you can work for me again!" Moondancer was uncomfortable and blushing heavily.

They were interrupted when another female voice came from one of the side corridors that lead into the one the two groups were standing in. It was a voice, two of them were all too familiar with: "Night Light?! TWILIGHT?!"

Something stirred in Night Light... "V-Velvet..." He managed to force out of his mouth.

"Oh, come on! Really?! 'True love' and that shit?!" Twilight was very much annoyed at how just hearing her mother's voice apparently managed to get her dad to fight against Sombra's magic! It actually made her worry that, if they failed here, Celestia might be able to reverse their spells... Pulling her dad closer to her, she turned to face the new arrival. "Hi, mom! Nice to see you again!" Shooting a glance down at her dad's crotch, she added: "And dad is also happy to see you!"

Once the night was over, it would be a little family reunion! Missing only her brother, and sister-in-law... And she'd have a new assistant! Twilight smirked to herself. Serving King Sombra had given her plenty of rewards already, and she'd only receive more! Unlike the thankless work for Princess Celestia! Or, maybe, she already was Princess Slutlestia?

Meanwhile somewhere else, Rainbow Dash, Spitfire, Thunderlane and Soarin hovered around one of the castle's towers. They observed the shadows they saw.

Inside the tower, one griffoness was calling for another: "Gabby!

"Yes, Gilda?" The grey griffoness hurried to her superior!

Gilda Griffon grabbed the younger griffon at her shoulders and sternly looked into her eyes! "Go!" She told her, while pointing out of a window.

"What?!"

"GO!" The brown griffoness repeated! "Go back to Griffonstone and tell the others what happened here! Warn them!"

"But-..." Gabby struggled for words, surprise, confusion, duty and loyalty warring with each other.

"I'll stay behind and cover your getaway!" Gilda told her, stuffing important-looking papers, maps and more into a messanger bag. "Just remember to get through that spell as fast as possible, before it manages to affect you! Once you're past the shield, do not. Slow. Down."

"But... wouldn't it make more sense for you to go, while I hold them off?" The other one suggested. "You are my commanding officer! It's more important for you to get away!"

"I am the better fighter... And responsible for you. Also, you're faster, that's why you're the designated messanger!" The older griffon threw the bag over Gabby's shoulders. "Let's go!" Gilda opened the large window and jumped!

After a moment, Gabby followed, and the two griffons spread their wings. They soared towards the tip of the shield protecting them, when... "Huh... Didn't expect griffons!" A tall, dark pegasus stallion cut them off, trying to grab Gabby!

"Leave her alone!" Gilda shouted, about to rush their opponent! The stallion seemed familiar, but, she couldn't quite put her claw on it...

But before she could reach him, a cyan blue obstacle appeared between her and the pegasus! A very familiar voice, in a mocking tone, told her: "Ahahah! Not so fast!"

"Rainbow Dash?!" The griffon looked like she was staring at a ghost! "Why...? How...? What...?" She stammered, before noticing what was behind her: "Your wings?!"

"Hello, Gilda!" Dash smirked. "Yes, I have wings again! King Sombra gave them to me... A reward for me joining him!" Her smirk turned face-splitting when she saw Spitfire quietly appear behind her old friend! "And soon, you will also serve him. Together with me!"

However, as if warned by a sixth sense, Gilda managed to dodge Spitfire's assault! The fiery pegasus crashing into Rainbow Dash, hindering and disorienting both of them for a few moments! This opened the way for her to free Gabby! She propelled herself forward with fierce, powerful thrusts of her wings! Thunderlane was distracted by trying to keep the struggling griffon locked into his grasp! He didn't notice Gilda soaring towards him, until it was too late! She crashed into him, and they both began to tumble towards the ground!

The moment she was free, the younger griffon dashed off! Rainbow Dash and Spitfire had recovered, and dove after them! Thunderlane and Gilda herself got a hold of themselves now! As she was getting mobbed by the three attackers she used to work alongside, one of which she had considered a friend, Gilda called after her young companion: "GABBY! GO! FLY! FLY AND DON'T LOOK BACK!"

Tears of guilt of leaving Gilda, and Equestria, behind like this streaming down her face, Gabby flew like she never had before. She only stopped after many hours, when the sun rose.

As all of this went down, King Sombra, Radiant Hope and Nightmare Moon, together with an elite detachment of their guards, rushed through the corridors! They were hurrying towards Celestia's private quarters... According to some guards and staff they'd captured and interrogated, she should be there, trying to rest a little. Apparently, the shield right now was held up by a group of unicorns instead of herself.

In her room, Celestia had been woken from an all too shallow sleep by an explosion! She jumped out of her bed and quickly threw a gown over before she hurried to the balcony on the outside of her chambers! What she saw made her guts freeze! Scores of enemy troops were rushing through a breach in the wall!

Not even one night of sleep she was allowed... She felt drained... The sally had left her shaken to the core and Celestia had only just started to really regain her composure... Wasn't she allowed at least a good night's sleep?

Taking a deep breath, the princess shook these thoughts off! It was just the pressure, and the exhaustion, she told herself! She needed to be strong, and composed, for the good of Equestria! Barging back into her room, she hurried to put on her armor, but without calling for some help to do so, it would be slow.

At least she knew that the colts and fillies were in a secure location... That was a somewhat reassuring piece of knowledge, since it would mean that Sombra's forces wouldn't be able to use them as leverage!

The leg armor was the easy part! But now, she started to hear fighting in the hallway, and when the door got flung open, she had just managed to armor her arms! She had almost expected that this would happen when she'd seen their forces... But when Celestia turned to face her enemies, she was left petrified by shock! She had expected Tempest Shadow, Twilight Sparkle, or King Sombra himself!

Well, King Sombra was there alright, together with an unicorn mare... But both of them stood behind somepony she hadn't expected to see again. At least for a very long time... "Hello... Sister!" Nightmare Moon hissed angrily! "Surprised to see me?"

In her distress, Celestia wasn't able to fully control herself! She seemed almost insecure! "Luna?! But I-..."

"Banished me back to the moon? Yes, Tia, you did!" Nightmare Moon tried to seem calm, collected, superior. But she couldn't quite hide the venom in her voice! "And King Sombra freed me!" An evil grin spreading, she continued: "He did more for me than you ever did, sister dearest! He's been more generous than you!"

Everypony in the room knew it was a lie. But that didn't make the remark sting any less. Celestia had blamed herself so much for not having found another way to deal with her sister's issues, not even when she had returned... Now, hearing her own sister so smugly declare that this tyrant had done more for her...

"You look tired, princess... Exhausted even!" Sombra laughed sardonically, and his taunting didn't stop there: "Are you sure, that you want to fight us? You could just surrender and save all of us a lot of time!"

Anger flared in Celestia! "SILENCE!" She shouted, flinging a spell at Sombra and the mare as she fought down the urge to give into it, her mane almost turning into flames again, before she managed to supress it!

Both, Sombra and Radiant, had been prepared to defend against Celestia's attack. But, to their surprise, Nightmare Moon actually took that upon herself. She handily dispelled the attack, weakened by her sister's inner turmoil. "YOU CAN'T TRUST HIM, LUNA!"

"STOP CALLING ME THAT!" The younger alicorn snapped back! "I AM NIGHTMARE MOON! YOUR LITTLE SISTER IS GONE, AND ONLY I REMAIN!"

Again, she felt something stir inside of her! Maybe... Maybe she should just use it? Show those fools a power they stood no chance against, burn them to cinders... No! She should not... COULD not give into it! "I don't believe you!" Her voice was quiet. Dangerously quiet. But not without some warmth, hope, promises... "I know that the real Luna is still inside of you! Hoping that I can end this nightmare of hers!"

"Tia..." Her sister whimpered.

Radiant raised an eyebrow! Nightmare Moon suddenly looked small, almost like a scared little filly who's parents had just told herhow disappointed they were that she had done something stupid, and dangerous. But also, how they know that she could do better, and that they believed in her! The queen couldn't help but to feel moved... She didn't have any siblings, but how Celestia must have suffered because of what she had to do to protect Equestria... If she was being honest, part of her almost wanted the princess to get through to her sister...

Sombra didn't like it. If the two alicorns teamed up, even with his magic in play, they could be able to turn the tables on him!

"Luna! Please! Fight against her! Fight against the Nightmare Force! Fight against Nightmare Moon! Come back to me!" Celestia implored her little sister! And it seemed to work! Nightmare Moon was clutching her head, apparently having an internal struggle!

The king prepared a spell. But moments later, the dark alicorn began to laugh! It started as a cackle, and quickly devolved into a vile, mad, taunting laugh! Her hands still pressed against her head, Nightmare Moon began to speak again: "Sorry to disappoint you, Celestia! THIS is the true me! I am in control! The old me was weak and pathetic! I am strong! I won't let myself get overshadowed by you any longer!!"

Still laughing, Nightmare Moon lunged at her sister!

Sombra looked at his wife. They had originally planned to fight Celestia together, but, apparently, Nightmare Moon's hatred ran deep enough for that sort of thought to take a backseat. At least when aggrevated.

Radiant just shrugged. If they tired each other out, that was fine as well.

Despite being confined to Celestia's, admittedly very spacious, chambers, the battle between the alicorns was impressive! Dazzling displays of magical might interspersed with impressive physical prowess! Seeing those two amazonian beauties wrestle, sweat glistening on their furs, made Sombra mentally take a note to have them do that as entertainment for him later... Maybe with some adjustements...

Being honest, Sombra was surprised how well Nightmare Moon held her own against her older sister! Either, she was stronger than he had assumed, or the plot they had come up with to wear Celestia down had had some success, considering she had won against her younger sister twice already! Be it physical exhaustion or mental anguish at everything that had happened and having to face her younger sister for a third time, but the princess didn't seem quite as formidable as usual!

However, the fight couldn't be allowed to drag on for too long! For one, if the garrison managed to rally and fight back, worse, if the ponies of Canterlot rallied and began to reinforce the garrison, it might get a bit... unpleasant. Worse! The magical attacks between the sisters began to grow less and less focused, and it wouldn't do if they levelled Sombra's and Radiant's new castle without even noticing! Without speaking a word, just by looking into each others' eyes, king and queen knew what to do next...

As the sisters were locked into single combat, distracted by each other, Sombra and Radiant Hope started to move. Carefully, they avoided stray blasts and anything that might draw attention at them! They got into position just as Celestia was charging a powerful blast... And the two followed suit.

Nightmare Moon, seeing the destructive power her sister was gathering, panicked! Without thinking, she shot a blast at Celetia! The moment it went flying, she knew it would be far too weak to be anything but a minor inconvenience! It would hit her, and just fizzle out...

Instead, when the blast hit Celestia, it created a major explosion! To Nightmare Moon's own surprise! The blast must have had more power than she had thought... SHE must be more powerful than she had expected! Then again, she was Nightmare Moon, the queen of the Nightmare Force!

Sombra and Radiant watched as Celestia toppled over like a chopped down tree. The smell of burned fur filled the royal couples' nostrils as they looked at the wisps of smoke rising from a scorced patch on her back.

"I DID IT!" Again, Nightmare moon laughed like a maniac! "I FINALLY DID IT! CELESTIA LIES DEFEATED AT MY HOOVES!" She knelt down and grabbed her sister's head. "Soon, I will show you what kind of a miserable existence it is to be stuck on the moon!" Still laughing, she rose to her full height again! "Now that my sister is dealt with,-" Nightmare Moon turned around, panting heavily, the laughter fading and her voice turning cold and serious, "-It is time to renegotiate our deal..."

That mare really had an overblown sense in her own superiority! Here she was, exhausted, almost defeated, and yet she wanted to fight the rested, if still slightly hurting, King Sombra? Maybe she thought that her pathetic spell had defeated Celestia! "I beg to differ." The king replied coldly.

"You beg to differ?" She laughed mockingly!" You BEG to differ?! My sister lies beaten at my hooves! You are nothing compared to her, or me! Instead of my sister's willing weakness, BEHOLD THE POWER OF AN ALICORN UNLEASHED!"

As Radiant Hope watched, Sombra chuckled. It was as cold as his words had been before. "Kneel!" He commanded even icier.

"I will never-..." Before she could finish her defiant reply, the princess' body lowered itself to the ground! Nightmare Moon was in utter disbelief of what had just happened! "What... Why am I-...?! My body isn't..."

"You really thought I'd leave somepony like you without precautions?" Sombra scoffed, taunting her! "You lost the moment you were summoned... Princess Luna."

Fighting against her own body to rise, she shot him hate-filled stares. "DON'T CALL ME THAT! I AM NIGHTMARE MOON!" The alicorn spat out! "I defeated my sister! I will not surrender to some upstart mongrel!"

"Without our help,-" the king pulled his beloved wife to him, "-you wouldn't have been freed. Celestia would have beaten you again. You would be rotting on the moon."

"Bow. Down." Radiant added, her tone almost as cold as her husband's! It was almost a surprise even to her husband. She so rarely dropped down so far...

Again, Nightmare Moon went down to her knees! Again, she struggled to rise again! But this time, she was unable to. A defiant, hate-filled glare levelled at him, Sombra pulled the alicorn's helmet off, and slipped one of his inhibitor rings onto her horn. "Time to make make you obedient..."

Sombra blasted her with his mind-control spell! Tired, and exhausted, even if Nightmare Moon would have never admitted how much everything had taken out of her, the princess's will gave way slowly, but steadily. And there was that small part of her mind that, since aeons, had fought against the darkness inside of her, that so wanted to return to her sisters side! And the more Nightmare Moon's will retreated, the more the darkness of her fur receeded. More and more of her normal fur colors showed...

The beaten Celestia raised her head. "L-Luna?" She whispered weakly.

A few minutes later, Sombra's work on Nightmare Moon was almost done. Or rather, his work on Princess Luna, for this was who was kneeling in front of him now. She was obedient now, but not fully loyal. Bent, not broken. That would come soon! And Sombra would enjoy it. A lot. Adressing his wife, he told her: "Her Nightmare Moon persona is still there, but supressed. If need be, we can have her switch back to it." Radiant nodded. She knew what he meant. In both regards. "And now, I think it's time to proclaim our victory. And end the fighting!" He grinned.

"Yes, dear!"

Slipping another one of his rings onto Celestia's horn, he again turned to his wife: "Give me the collars."

On his command, Radiant pulled out two jet-black collars. Each was fitted with a blood red stone, in the shape of a star, on the front. The king snapped them around each of the sisters' necks, then conjured a magical chain.

Sombra dragged the sisters after him as he stepped onto a balcony, overseeing the chaos outside. His horn glowed as he cast a spell to amplify his voice. It also would slowly subject everypony that was listening to the effects of his mind-altering magic. This alteration had been very complex, and Starlight had truly outshone herself! "PONIES OF CANTERLOT! ROYAL GUARD!" He thundered, his voice now easily carrying over the castle grounds and the free parts of Canterlot! "RESISTANCE IS FUTILE! YOUR PRINCESS HAS FALLEN! And so has her sister. SURRENDER YOURSELVES AND STOP THE UNNECESSARY DESTRUCTION!"

Elsewhere, the fighting stopped. The equestrian fighters out of shock, surprise, or plain confusion, the Crystal Empire forces because they had been ordered to, when the king announced his triumph. However, very quickly a lot of the equestrian forces resumed their fighting, with Sombra's troops now on the defensive! They didn't believe, didn't want to believe that their princess had fallen!

With a harsh tug on the chain, Sombra pulled Celestia into his projection. Tired, beaten and broken, she made for a pitiful appearance. Her partially armored night gown was torn, barely hiding her dignity.. And now, to break her and her ponies, King Sombra would make them all watch as he plowed their beloved princess... As he broke the remainder of her resistance and made her his servant, his slave, his pet, and his brood mare!

Easily, the powerful unicorn lifted the tall alicorn up, so that anypony that was looking at the balcony could see them, and, thanks to his spell, everypony who couldn't see them would be able to hear them. Radiant, with a few, swift hand movements, pulled her husband's piece out, without Celestia noticing.

"Who are you?" King Sombra asked her gruffly, Radiant giving the chain a little tug.

Her eyes flashing with anger, she replied, through gritted teeth, "Princess Celestia of Equestria!"

Immediately recognizing her voice, many equestrian's lost heart hearing her respond to Sombra. For others, it just fanned the flames of anger. But for now, they all just listened.

"Whom do you serve?" The deep, dark voice of Sombra continued.

The reaction was not what Sombra would have liked... "NOT YOU!" She barked defiantly back at him! "THE ONLY PONIES I SERVE ARE MY LITTLE PONIES OF EQUESTRIA!"

Hearing this, all of her forces, and the ponies in the city, found new heart! The lul in the combat ended when they attacked Sombra's forces with redoubled effort!

These words hadn't been what he would have liked. It had been, on the other hand, what he had expected. Being honest to himself, he preferred it this way... His right hand moved up, stopping for a moment to give one of her large tits a little squeeze, before grabbing her jaw. "Now, I will break you!" He whispered into her ear. "Once and for all. And after you, it's your sister's turn. Then you both can serve me together. Admit it, you want to be reunited with Luna."

An annoyed, slightly scared, groan was the answer. At least until he lowered her onto his waiting dick.

Sombra had to admit: The princess' pussy was divine! Honestly, anything less just wouldn't have been appropriate for Princess Celestia!

And Celestia had to admit: King Sombra's dick was divine! Probably the best she had had in over a thousand years! Even better than Mirror-Sombra, his good counterpart in an alternate Equestria, with whom she had had a doomed affair a long time ago! He had been suave, and kind, and, when she had been in a bad place, a comforting, consoling shoulder to rest on. Until... things happened and she couldn't visit him anymore.

And yet, this version of him, this villain... When he had penetrated her, it was like nothing she had felt before! His cock filled her out so well, and the whole situation, demeaning and distasteful as it was, somehow made everything just more exciting for the princess! It was... weird. On the one hand, she hated what was happening! But on the other, being used like this, it was just unlike anything she had experienced before. Any time she had needed to satisfy her sexual needs it had always been with ponies that almost worshipped her, nervous, grateful, worried about doing anything wrong! And, she had to be that honest, usually not quite her match, the issues of being an alicorn. As such, she had almost always ended up being the natural domme, and the few times she hadn't dommed, it had been more in the ballpark of equals.

Sombra, however, was taking her like a whorse! Like a needy slut who'd sell her last shirt for a fuck! It was... kind off refreshing? The unicorn had no restraint as he was plowing her, he knew what he wanted, and had no issue just taking it! It was the best sex Celestia had ever had... And she felt her mind slip, felt how the dark overlord's cock and magic did their work on her! Worst of all, a part of her welcomed it! Pleasure, peace... no more responsibilities, no longer having to carry the weight of Equestria on her shoulders, no hard choices to make... Just pleasure... She didn't even realize that he'd been fucking her for several minutes now, with no sign of slowing down!

Hearing her moan, feeling how she squaled, and how her pussy clamped down on his shaft, the king asked her, "What do you love?"

"COCK!" The word had left her mouth before Celestia's mind had even realized the question! But it had felt... good to say it? It was as if aeons of pent up desires began to unload themselves, bursting a dam she hadn't even known to have errected.

The protective barrier around the last free corners of Canterlot began to fade away. Either Celestia, or whatever other ponies had been feeding it with magic, had stopped keeping it up. Maybe the spell itself had fallen apart. In a matter of moments, all of the equestrian capital was engulfed in Sombra's magic!

"Whose cock, whore?" Sombra roughly asked her now...

If everything so far had been bad enough for the ponies of Equestria, hearing Sombra talk like this to their beloved princess was worse! And yet, it would get worse still...

"YOURS!" She cried out!

"What are you?" He continued, egging her on!

"I am Princess Ce-... I am King Sombra's slave! His fucktoy! His cumdump!" As she screamed these words, Celestia's face had taken on a lewd, submissive expression, her tongue hanging out of her mouth as she panted like a bitch in heat.

As the magic began to do its work, the fighting was slowly dying down again. More and more ponies, in the process of being turned into Sombra's subjects, gathered in front of the castle, on the castle grounds, and wherever they could watch how their princess was defiled...

More and more ponies began to kneel, as heir gazes were fixed on King Sombra claiming their princess. Nopony knew how much time had exactly passed, but it felt, at the same time, as if he'd been fucking Celestia for a few minutes, and a whole eternity. A shiver ran down their spines as they heard him ask: "What do you want?"

No longer holding anything back, Celestia let shouted her desires into the night! "Cum! I want to cum! I want to be filled with cum! I want to serve!"

She asked, and she received. Never before she'd been fucked like this. Been used like this... And, as much as a tiny, steadly fading voice in the back of her head tried to convince her otherwise, she never didn't want to go back to when she hadn't known this pleasure!

With a little smile, Radiant, for now, lifted her contraception spells on everypony. For now, it was probably time to consolidate, rebuild and make new plans... Then, as husband let Celestia down onto the balcony, she offered Princess Luna to him. Gently, Radiant Hope gave their new pet a head pat, and the way Celestia reciporated by pressing her head against her hand... It was proof that she was now theirs.

"Ponies of Canterlot!" The king adressed his new subjects as he bent Luna over the railing! "Your princess has fallen! So has her sister, whom you know as Nightmare Moon! You have resisted me long enough!" And they would no longer. The vast majority of them already had succumbed to his magic, and for the others, it would be but a matter of minutes. "We had to siege you for weeks! My troops need to b low off some steam! So, all of you should offer yourselves to them!"

As their new sovereign commanded, most of the remaining ponies, abased themselves almost immediately before his forces! Stallion or Mare, it didn't matter! And the soldiers gladly took the offer... Plowing the former Nightmare Moon to his heart's content, and later having Radiant, and Celestia, join, Sombra enjoyed watching the orgy on the castle grounds.

So did Twilight Sparkle and the others. They already had their partners, however. Thinking back, she had to admit that Canterlot society had always been pretty stuffy and boring! Well, that would no longer be the case.... Especially with her mother and father drinking from her milk-laden tits.

A few days later, the great spell had fizzled out, no longer needed, and the worst of the damages had been reasonably well repaired. It would take a while for Canterlot to shine in its old glory again. Or rather, its new glory! Sombra's new subjects had quickly returned to their homes and continued their lifes with their families, some casualties not withstanding. It was like always... just under new management. Colts and fillies returned home from their secure hiding places... And nopony would ever dream of trying to go against their beloved king!

In King Sombra's new castle meanwhile, Rarity had a surprise for all of them! She had, with some help, made new outfits for all the female members of Sombra's inner circle! Two outfits for each mare/dragoness! Exotic dancer outfits, based on Saddle-Arabian designs she had seen a long time ago, as well as harem costumes! Well, now she wanted to make new ones for Gilda, apparently an old friend of Rainbow Dash, and Celestia and Luna! And maybe some other designs?

When they had celebrated their victory in earnest, all of the girls had dressed in the dancer attires and performed for the king. To everypony's surprise, Cloudy Quartz had been the most impressive! It was as if her previous life had held her back!