Rose wondered how the ponies on the train would react if they knew who the three ponies heading to Canterlot truly were. Having the hybrid daughter of Princess Cadance, the former changeling queen and the dark reflection of their hero Rarity, the latter of which was empowered with unchecked and unrivalled magical power, on the same train as them was likely disconcerting. She supposed they'd likely panic, perhaps they'd run screaming to Celestia and Luna to save them, or perhaps to Twilight and her friends. How would they react when instead of solace or horror the leaders responded with perverted glee? How would they react when Daybreaker and Nightmare Moon returned and the Princesses responded the same way? More importantly, how would her Master respond?

Rose would find out soon, but it was good for now that the two villainesses were disguised with their changeling magic. Nightmare Rarity, posing as a simple, albeit slutty, nun dressed in tight revealing latex. A symbol of how she worshipped Spike, Rarity and the rest of the harem as her betters.

Meanwhile, Chrysalis had opted to dress as a heiress, mocking the nobility of her arch-foes, and with a sensual body to go with it. Naturally, Chrysalis had refused to disguise herself as any 'mere commoner' as such a thing would be an insult to the proud queen. Rose didn't argue with her, not when she couldn't help but check it out whenever she got the chance.

"Thank you so much for your help, Nightmare Rarity," Rose whispered to the disguised dark unicorn. She simply flashed the hatchling with a disarming smile.

"No thanks are necessary, my dear Rose. I am a mere slave before my Master and his harem of his slaves, as the lowest of the low within his Empire, it is simply my pleasure to do whatever I can to help." She answered with a regal bow of her head. Out of the corner of her eye, Rose spotted Chrysalis roll her eyes with a scoff.

"Yeah well, I'd like to thank you all the same," Rose said, she then leaned in a little closer for a whisper. "So hey, you're a Nightmare... persona? Counterpart? Personality?"

"A pony's dark form is the official name." Nightmare Rarity explained with a gentle smile.

"Right... so what are you like? I mean, you're obviously an evil version of the Diamond of our Master's horde, but in what way?" Rose whispered, listening to the disguised unicorn with rapt attention. This wouldn't be like last time, this time Rose was determined to know everything she could and plan for every complication. She wouldn't be such a naive fool this time, she would plan for the worst.

That had been what she had done last time, she had been so naive before at the Crystal Empire. Through Rose's naturally enhanced intelligence, she quickly deduced that the corruption of the Crystal Heart was making ponies slightly less creative. Not to any dangerous degree, nor in a way that would be noticeable to any pony, nor her Master. Yet Rose knew it was essential that her Master's slaves be as skilled and as perfect as they could be, and every trace of creativity should be cherished to make sure her Master's sluts could satisfy her Master better.

Sweet Rarity, she had been so naive. She'd been taught about how the world outside of the mirror universe wouldn't be so accepting of their place. Rose had always thought of it as a blessing, no, a dream come true to become her Master's sex slave, but the world around her did not agree. It was a wise idea, but it came far too soon, the time needed to pass for the ponies to understand that privilege hadn't passed. Thankfully, her mother had been able to corrupt the Crystal Heart again before things went out of control.

That was why she asked Nightmare Rarity about the nature of the dark forms so that something like that wouldn't happen again. Nightmare Rarity took time to consider her response, an elegant finger trailing across her lips as she considered her answer. "By our nature, we are foils to our natural forms. It is a little hard to explain, but one might consider us a perversion of the ponies' most deepest desires. Consider myself, before our Master remade me in his light, I was a twisted version of our Mistress's fantasy."

Rose could hear the tinge of regret in her voice, natural of course. It was common among those who hadn't been allowed to join Celestia's conspiracy. She nodded towards Nightmare Rarity to continue. "I had wanted to seize our Master's harem for myself, take his place as the dominant Queen of the Horde rather than the diamond within it. A twisted take on my counterpart's vision, at least until my Master redeemed me and showed me, my place as below all other slaves of his harem. A much better twist on our Mistress Rarity's divine vision."

Rose nodded, chewing on the information. "Did you change? Before and after Rarity developed her vision though? I mean it was only after the incident where you arrived in Ponyville that our Mistress had her vision, so did you change?"

Nightmare Rarity nodded slowly, every nod preceded by a careful consideration. "Yes, on that night, my goal was to reforge Equestria into my own vision of fashion and beauty, a perversion of our Mistress's love for beauty. But that desire changed when our Mistress embraced her fantasy, and so, my nature changed."

Rose nodded, fingers pressed against each other. "So, Daybreaker and Nightmare Moon are twisted reflections of the Slutprincesses' greatest desires. I guess Nightmare Moon was a reflection of Luna's desire for the appreciation of her ponies, but that was before she became the Slutprincess of Whores. After the two of them became corrupted, they'll have changed into twisted reflections of the desires of the Slutprincesses."

She started to tap her chin on her cheek. "Celestia's deepest desire these days would be to use her power to twist the world to her Master's sexual paradise, delighting in fooling the naive ponies of Equestria by posing as a gentle and kind Princess. Luna meanwhile likely desired an Equestria filled with whores, strippers and other sex industries since that's how she finds fulfillment now. I wonder how their nightmare selves will twist these desires?"

"Well, I suppose we're about to find out." Nightmare Rarity said, pointing to the windows where the Canterlot station was approaching and the train was slowing down. Rose could feel a lump forming in her throat as they arrived at the station, as the moment was approaching. She had sent word ahead that she would be arriving in Canterlot on 'business for her daddy' and sure enoug,h Celestia had been shrewd enough to send an agent of L.U.S.T to the station, to escort them back to the royal palace.

When Rose stepped off the station she clammed up as quietly as she could make herself. This wasn't the Crystal Empire any more, there was no Crystal Heart influencing the ponies here, and many of them would oppose her Mistress's dream rather than embrace it as they should. Certainly Rose was pleased to see that Celestia's efforts had borne fruit, yet Equestria was not yet the kingdom ready to embrace her Master. Soon though. Soon.

She was led through one of the secret passages of the Royal Palace, where unwanted eyes wouldn't be able to spy on them. Rose could feel her insides twist with nerves as she took every step towards the Slutprincesses and with them her Master. What if it went wrong again? What if the Princesses would refuse her suggestion? What if Nightmare Rarity or Chrysalis weren't to be trusted? What if, worst of all, her Master wasn't interested in her ideas, and she had wasted his time?

The thoughts rattled through her head as she made her way into the secret chamber where Celestia would act out her fantasies of submitting to her Master. The room was still adorned with all the stained glass windows, mosaics and statues of 'the four prophets' that had once inspired Celestia to become the Slutprincess of Servitude. She noted though that two new statues had been erected, that of Celestia and Luna herself kneeling before the statue of their dragon Master.

It was a scene that was quite familiar as, on the other side of the room, the two Slutprincesses were standing there, dressed in a revealing but not quite scandalous dress. Their eyes were fixed on the three figures with varying degrees of suspicion, particularly for Chrysalis, though they softened their gazes for Rose. But Rose wasn't paying attention to the Slutprincesses, instead, she was interested in the figure between them, her dragon Master Spike.

She felt like she was about to freeze, did her Master see through her? Did he know about the Crystal Empire incident? Was he angry, mad?

"So, Rose how have you been?" Her Master asked, standing up from the throne with a warm smile and outstretched arms. "I heard from Celestia that you had an idea to serve me, that you wanted to do something."

His comforting smile put her a little at ease, yet Rose couldn't help but feel nervous. Something that her Master noticed, and he placed a hand on her shoulder. Even the touch alone was enough to send shivers down her spine. "No need to be nervous, you can do this. There's no need to worry, it'll be fine, understood?"

She felt a wave of relief wash over her, a feeling like sinking into a hot bath after walking through a chilly day. The lost anxiety gave way to lust and even greater love for her Master. Before she could do anything to stop herself, her lips pressed themselves on her Master's lips, not that her Master minded. He rewarded her by feeling her ass with his left hand and squeezing her breast with his right, each time sending new waves of lust for her body. She could feel his cock through his pants, so big, hard and perfect, she needed it inside her.

"Thank you, Master." She gasped once they pulled away, truly filled with gratitude.

Her Master smiled warmly. "My pleasure." He pulled back though, leaving Rose wanting. "But if we start fucking right now then we'll be here all night. Now, why don't you tell me what exactly your idea was."

"Especially one that includes Chrysalis," Celestia spoke, a harshness in her voice that caused Rose to flinch and look back to the Changeling Queen who had now dropped her disguise and wore a proud smirk.

"Aw, and here I was thinking you'd missed me Slutprincess, surely you know that we're all on the same side now." Chrysalis teased, her eyes shifting towards Spike's dick with a tongue rolling across her lips. "The same side of that cock."

"And her?" Slutprincess Luna asked, pointing at Nightmare Rarity. No doubt she was annoyed by any reminder of her Nightmare Moon past, not a reassuring thought, given the nature of the plan coming.

"I am only here to serve my Master and my betters, great Slutprincess of Whores." Nightmare Rarity said with a bow. The venomous tone of Luna's voice meant nothing to her. Of course, it was Luna's right to disrespect or abuse her as a superior slave, and Nightmare Rarity would never dishonour her that right. "And might I just say, your transformation into the Slutprincess of Whores has inspired prostitutes all the way to the Crystal Empire. I've opted to honour the occasion by crafting idols in your likeness for your worshippers, quite a few whores in the Crystal Empire have bought one. They pray to you to aid their work as their patron Slutprincess and many have confessed how inspired they've been by their faith to you."

"Is that so?" Luna gasped, and a light blue blush appeared on her cheeks. The Slutprincess's disapproval gave way to flustered interest. "W-we are honoured to hear of it. We will be sure to reward our followers for their faith."

Her Master smiled at Luna's reaction, in its own way, it was both arousing and heartwarming for him to see, but his attention was shifting back to Rose who had forgotten what she would say next. Surely Celestia and Luna would react badly, worse aggressively. Picking up on her distress her master embraced her once more, and whispered into her ear.

"Ignore them and focus on me. How is it you want to serve me? What fantasy do you have in mind? I bet you've been masturbating to it constantly these last few days, haven't you?" Spike whispered, his voice like an angel's, and his breath warm and hot on her skin.

"Yeah," Rose admitted, remembering how ever since she had thought about Nightmare Moon and Daybreaker, she had taken every opportunity to fuck herself to the thought of the two perversions of the Slutprincesses serving their Master's cock. Their devious natures warped into depraved devotion to her Master's dick, their evil eyes gleaming with reference. Just think of it now; it was making her weak in the knees.

"OH, fuck!" Rose squealed, unable to stop her hand from diving into her pussy, nor the moan from her lips when her Master pressed his thumb against her sensitive nipple. Even the slightest touch threatened to make her gush like a waterfall.

"Tell. Me." Her Master ordered, each word highlighted with a little pinch to her nipples. Rose might have cum right there and then if she didn't know if she had her Master's permission.

"I-I IwanttosummonNightmareMoonandDaybreakerandmakethemyourwhores!" She blurted out, in a scream that might have led to an orgasm if she hadn't summoned every inch of her will to resist until she had her Master's permission.

A dead silence passed over her room, and Rose became very self-conscious on what she'd just sent. Her timid eyes drifted to every other person there, all watching her...judging her. First, was Chrysalis who had a gleeful grin on her face, and then there was Nightmare Rarity who was giving Rose a gentle reassuring smile.

But then there were the Slutprincesses. To say they were displeased was an understatement. Celestia was livid, her rainbow-coloured hair was lighting up with furious flames, but she was nothing, nothing compared to her sister. Luna's piercing gaze looked downright lethal, as if a bolt of ice would fly from her eyes and pierce through Rose's heart for her blasphemy.

But Rose only had eyes for one person, or rather one dragon, who stood in front of her. To Rose's delight and relief, he was neither appalled nor horrified by her suggestion, rather he looked only intrigued. His hands continued to stroke her breasts, almost reassuringly. "Go on."

"I-I want them to compete with Celestia and Luna for the position of Slutprincess. I want them to challenge themselves to see which could be a better slave for you. I want them to push themselves to greater levels of depravity in order to win and earn the right to rule in your name." Rose took a shuddering breath, the words rushing out of her mouth faster and faster as she grew more and more excited. "If their dark forms are more sadistic and cruel, I want to watch them struggle to learn to love your cock, if they are a bunch of prudes, I want their desperation to corrupt them into being your whores. I want to watch their evil arrogance kneel before your cock and turn to willful submission. I want to see Luna and Celestia compete with their corrupted selves for the honour of being your whore on Equestria's throne. And...and..."

Rose was panting, she could go on and on, but the dreadful silence had returned and Rose's nerve had been lost. Rose's eyes looked over her Master's shoulder to the two Slutprincesses marching towards her with venom in their eyes. Celestia was the first to speak. "You cannot be serious! You would risk our Master's kingdom by bringing those monsters into reality?!"

Rose stepped back, her timidness returning and her throat closing up. "I-I just thought it would be-"

"It would do our Master no good to bring such dark creatures into our world, and you would think of surrendering our thrones to them? " Luna snarled, her echoing with a dark malice that almost made Rose want to scream. "We would rather-"

"Quiet," Spike said quietly, a hand raised and the two Slutprincesses with all their divine power were immediately silenced by the order to their Master. "Kneel."

Again the two Slutprincesses' divine power and authority over the most powerful nation in the world crumbled before their Master's simple request. The two knelt before them, their huge tits pressing against the floor, their glorious asses raised in the air, swaying from side to side. They trembled with anticipation, eager to obey their Master's next order. Celestia because she craved the opportunity to corrupt Equestria and secretly delighted in her wickedness, whilst Luna did so because she truly believed that it was what the ponies of Equestria dreamed of, and saw her Master's pleasure as a noble mission.

"Master," Luna said, her voice more respectful and submissive, a request rather than outrage. "It would be a mistake, foolish and dangerous. We shared a body with her for a thousand years. She is nothing but a malevolent monster who should never be let free nor the privilege to serve your will. Forget this idea, Rose does not know-"

"Rose is my daughter, that gives her a higher place in my harem order, she is owed respect," Spike said firmly, and Luna was quiet. Rose felt her knees quiver, almost about to give out from relief, but her Master wasn't done. "Besides, that's not the entire truth, is it?"

The Slutprincesses' expressions became more confused, they knew that their Master was telling the truth but they didn't know what that truth was. They remained quiet, their eyes wide in silent pleading for their Master to answer their question, Spike smirked, kneeling down himself. "Come now, aren't you both secretly attracted to your alter egos?"

The two Slutprincesses gasped, Luna louder than Celestia, the silent pleading in their eyes replaced with panicked lust as they thought about their alter egos. They had practically wired their lips shut to prevent from screaming out in lust as they thought about their alter egos. To Rose's delight, Spike's smile became ever wider as he saw their expressions. "Don't you want to fuck that fiery bitch, Daybreaker, Celestia? Don't you love her huge tits? Wouldn't you love to fuck a woman with tits as big as yours?"

"Yes Master, yes I would, but-" Celestia pleaded, her head nodding feverishly but any protest was silenced with a finger placed on her lips.

"And you, Luna," Spike said, turning to the Slutprincess of Whores, eyes wide as she was addressed by her Master. Her whole world was torn up before her. "Haven't you lusted over Nightmare Moon's dark beauty? Haven't you leered at her beautiful ass in your dreams? Didn't you love being in her dark, sensual body even if you didn't like her actions?"

"We-we... we did Master, she was sexy and sensual but her actions were that of a monster." Luna protested, but her protests were growing weaker and weaker.

"Don't you both desire to make them your pets, your slaves, you personal fuckdolls? Doesn't that make you horny beyond measure?" Spike asked, her grin wider and wider. From the corner of Rose's eye, she could see Chrysalis grinning wider and wider as she saw her hated enemy reduced to a drooling wreck.

"FUCKKK!" Celestia cried, her fur now dripping with sweat and a hand had snaked is way around her colossal perfect tits.

"Please, please, please." Luna begged collapsing onto the floor, her long, dark fingers digging as deeply into her gushing cunt as she could reach. Her mind was in a frenzy and she probably didn't know herself what she was begging for.

"Now, answer me, my dear Slutprincesses. What do you two think? You can take the risk with my beautiful daughter-slut's challenges to make them your fuckpets or you can live without them forever. Your choice?" Spike said, a hand stroking down Rose's mane as he said beautiful daughter-slut, sending a shiver down the hatchling's spine.

"Fuck, fuck!" Celestia cried, her lips wrapped around her huge right tit whilst her left hand stimulated her gushing cunt. "You cruel, sexual beast of a Master!"

"I need an answer, slut." Spike said, squeezing Rose's ass particularly tight. The bolt of pleasure caused Rose to yelp.

"YES! My fucking Master. Fuck, yes!" Celestia cried, her mind a storm of pleasure. Their Master's attention then turned to Luna who was more composed, and concerned.

"And you, Luna?"

"If-if we lose the challenges, can you promise me that Nightmare Moon will serve you loyally? That she will continue to serve our whores diligently and faithfully? That she will ensure that the prostitutes of Equestria will be rewarded for embracing our night?" Luna pleaded, her fingers still furiously masturbating, but with a gentle desperation to her voice.

Naturally, their glorious Master rewarded her slave's request. "Of course."

"Then yes, Master. But do not expect me to go down easily." Luna answered, filled with newfound resolve. Rose almost collapsed, it was going okay so far, she was serving her Master well.

"Now, one last question Rose." Her Master said, turning back to his daughter with a warm smile. "What challenges have you got in mind?"

Author's Note

Chapters might be coming out slower now, I've received a change to my schedule now so I might take longer to write now, but I'll try to keep it up. But I hope the results will be worth it.

Got a clear idea of the direction of this arc (thanks to Jonathan Stag) and a clear idea of Daybreaker and Nightmare Moon's personalities. I hope that people will enjoy them. I still need ideas for challenges though, so if people have any feel free to suggest them

Crowdfunding for Future Artwork here: https://ko-fi.com/darkstar239

Any suggestions, feedback, and constructive criticism are welcome.