Nightmare Rarity corrupts Twilight

With her plan regarding Twilight about to be set into motion Nightmare Rarity examined her prey. She was a beautiful, polite and sexy creature, her body had been intentionally designed to be a fantasy for every pervert who gazed upon it. And she was as intelligent as she was perverse, some would have liked the slaves as mindless cunts to fuck but neither Rarity liked that. No to them it was immensely more satisfying to have those slaves turn their ingenious minds to greater acts of perversity and service.

"Twilight," Nightmare Rarity spoke up, causing Twilight's head to snap up from her book.

“Mistress! I didn’t hear you enter, is there something I can help you with?” Twilight asked, placing her book down and standing up with an eagerness once reserved only for Celestia. “Perhaps you are delivering a message for Master?”

She seemed extra hopeful about the latter option, an unpleasant reminder to Nightmare Rarity that even disguised as her counterpart she was still considered less than Spike. Nevertheless, she wasn’t going to let that show on her face.

“Just me today darling. I have a special task for you tonight, and I would quite like for this to be a secret dear,” Nightmare Rarity explained in the best imitation of her counterpart she could muster.

Cocking her head in confusion Twilight however seemed intrigued. “Are you making this a surprise for Master Mistress?”

“Yes I am darling,” Nightmare Rarity lied, as she considered where she was going to do this. The last thing she wanted was to be interrupted as it was last time… perhaps the dead old Time Master had some uses after all.

“There is a secret tunnel that leads out of the castle into the mountainside, it’s hidden behind the statue of Princess Amore II. If you simply speak the words ‘Shadow Sapphire’ it should open. Would you kindly meet me there early in the morning when all others are still asleep?” She ordered the dutiful bookworm. She had been told about the passage since her first meeting with the Time Master, they had meant it to be an escape route for the unicorn, or perhaps an opportunity to share messages and orders, now however it could serve a better purpose.

Twilight tapped her chin in thought, “ah I’m guessing that must have been created by Princess Amore II before Sombra froze the Empire for a thousand years. I wonder if there are any more secret passages around the castle?”

“I wouldn’t know dear,” Nightmare Rarity replied earnestly.

“Then how do you know about this one?” Twilight asked, her head cocking ever so slightly with curiosity.

"Oh, I have Cadence to thank for that one, a few times she and I have sneaked off for a little quickie as it were," Nightmare Rarity lied effortlessly but with the hopeful dream that this would become the truth in the not-so-distant future.

"Maybe one day you can invite me for one of those quickies... maybe invite our Master as well," Twilight playfully suggested and it took a great deal of effort for Nightmare Rarity not to roll her eyes at that. Make no mistake of course there would be a time she was fucking that dragon, but he would not be her Master. No, this time he would be her **** and she would be the one calling the shots.

"I'll see you then Twilight," Nightmare Rarity said, waving her off. Her mind wondered just what exactly she wanted to do with the studious alicorn.

Cadence

Cadence took no pleasure in her current task, and in fact, in some ways she outright detested it. She could imagine all sorts of other things she'd rather be doing rather than stalking her Mistress. She could be recording more porn for her Master, she could be continuing new reforms in the Crystal Empire, or she could be fucking away her overwhelming insatiable lust. A part of her wanted to make Chrysalis pay for what she had done to her, and even if she hated to admit the Queen was extremely hot.

But her duty to her Master, concern as a friend and suspicions as a Princess had led her to spend her night violating her Mistress's privacy. Stalking her through the halls of the Crystal Empire, blending into the background with a simple chameleon spell. An elegant grace allowed her to follow her Mistress throughout the night without making a sound. Soon daybreak would come and Chrysalis would take her place for the day shift.

But then the doors to her Master and Mistress's room opened and her Mistress left the doors. Strangely she seemed to lack any of the drowsiness or misery a morning would normally bring to someone. Instead, she skipped through the halls with all the grace of a pleasant afternoon walk.

Wondering what could possibly have her Mistress awake at such a time caused Cadence to frown as she followed her Mistress. She supposed it could be some sort of surprise for their Master, but she couldn't help but feel that something was off about that. She couldn't imagine why her Mistress would ever want Cadence to be more in love with Chrysalis than their Master, it just didn't make sense.

So she followed her into the depths of the castle, walking through hallways that Cadence herself had never bothered to explore. Ancient halls and paths were set up by previous Princesses for all sorts of weird and strange reasons. The normal spotless crystals became grimy, cracked and decayed. Instead of ornate wooden doors, there were iron gates with bars across them. This must be a dungeon from a twisted ancestor of hers. Peeking through the bars she saw that these weren't the fun sexual dungeons either, where her Mistress and Master could employ all sorts of erotic BDSM on them. No these were the sort of dungeons where confessions were extracted from the innocent and sadists pretended their **** methods worked.

Cadence had crossed a lot of lines recently but this still brought shivers down her spine. What on Earth could her Mistress want with a place like this?

She soon found her answer as she found her by a portrait of her distant ancestor Princess Amore II. She had lived long before Sombra had conquered the Empire but had little differences between herself and the future tyrant. Famously paranoid and cruel, she was known to create many secret halls and passages throughout the Crystal Castle.

"Shadow Sapphire," Rarity spoke and the portrait began to open up. How had her Mistress happened upon this route, it was one that not even Cadence herself knew about. Once she had passed through the portrait closed behind her, and despite her best efforts Cadence could not keep herself secret and close the distance in time. Opening the portrait would be an easy giveaway, so with no other choice, Cadence simply pressed an ear to it and hoped she could make out what was going on.

“Ah, Mistress I made sure to get here early so you wouldn’t be kept waiting. These really are some fascinating pathways, I heard that they were made during the peasant revolt of-" Twilight babbled, and immediately Cadence's heart skipped a beat. Why had her Mistress requested Twilight meet her here?

"Twilight dear I'm afraid I'm not interested in the history of this place, I have a different task for you," Rarity said, her voice becoming uncharacteristically impatient. Then Cadence heard a sound, much like bubbles forming and rising. A want it need it, spell?

"You see my tits Twilight? My large, creamy bosom? Do you see how large they are? How sexy they are You want them, you need them don't you?" Rarity purred, and Cadence could just imagine getting transfixed on the unicorn's gorgeous melons. Nothing about this was untoward, she was their Mistress and Twilight was her ****.

Cadence could hear the crashing of purple hands on cream-coloured tits from behind the portrait. She guessed that Twilight must have leapt forward to **** their Mistress's tits, a dark yet gentle chuckle from behind the door only confirmed that fact. Soon however there was a gentle hum of magic and a **** coo of disappointment from Cadence's favourite sister-in-law.

"Ah-ah-ah darling. I know you would like nothing more to **** this perfect body of mine, but not yet... no not until you do one thing for me."

"Anything Mistress."

"Let me into your mind, let reshape you from the ground up. There is always a thrill to seeing your mind as putty in my hands," Rarity continued, her voice becoming shrill and excited. Cadence herself however frowned, this was getting far too familiar. And why did her Mistress feel the need to hypnotise slaves already loyal to her Master?

A/N: So there was a lot of speculation last chapter about how exactly Spike would win (and some people were right this time) and whilst all those comments were interesting it meant that I didn't get any suggestions as to what should happen to Nightmare Rarity. So suggestions on that would definitely be helpful.

Crowdfunding for Commissions: https://ko-fi.com/darkstar239