Celestia sat enthroned in her personal quarters, her back holding the exact curve that made her seem both dignified, yet approachable. She'd had a great amount of time to perfect her grasp of posture and body language, and it came as second nature to her now.

That was just as well. She was vibrating with emotion, and it was incredibly hard not to betray that on the outside. Her thighs quivered with the urge to rub together, and her nipples jutted against the fabric of the thick bra she'd chosen to hide them. Beneath her panties, a thick dildo was buried in her cunt, just as her Queen had seen fit to place there.

Fuck, she was so turned on.

Turned on and afraid, because, despite all the reassurances she'd given Chrysalis, she was terrified that this could go terribly wrong.

A knock sounded at her chamber door. "Come in," called Celestia, her voice wobbling just a little.

Twilight Sparkle, the youngest alicorn, stepped into the room, her hooves soundless on the thick, soft rugs. She was wearing a white blouse and a purple plaid skirt, over long black stockings - something that, to Celestia's eyes, looked like a more adult echo of a schoolfilly's uniform. No doubt Twilight had chosen it because it looked suitably studious, or simply because it was comfortable. There was no way she could have known how hot it was on her, how fuckable she looked.

Celestia stifled a whimper, biting her lower lip.

"Hello, Princess! It's so good to see you!" Twilight declared brightly.

"It's good to see you too, Twilight," Celestia replied with the surface appearance of poise, long-practised self-discipline keeping her own wings from so much as twitching. Oh, but it was good to see Twilight, and it was going to be even better to see her wide-eyed, naked, touching herself, stripping, fingering herself-! A shudder ran through the Solar Princess.

For years, she'd managed to fight back the increasingly lurid fantasies she was having about Twilight. Not of dominating the younger mare - Celestia knew herself for the submissive slut she yearned to be - but of the two of them serving side by side, obedient, eager fucktoys that couldn't bear to be apart. Lovers, thralls, urging each other to ever greater depths of depravity... all in service to some shadowy figure Celestia had never quite defined. Now, the fantasy was real. Chrysalis had come to fill that role for Celestia, and regardless of what Twilight thought she was here for, she was about to join them.

Celestia couldn't keep from squirming subtly in her chair, feeling the dildo shift a little inside her.

She and Chrysalis should have made peace decades ago! To think of all the time they had spent fighting, when they could have been fucking. And the worst thing was that entire generations of ponies had grown up hating and fearing changelings, when they could have been welcoming them as friends and neighbours, making them part of the tapestry of Equestria. It was one of the most tragic wastes Celestia could imagine.

"Twilight, I'd like to ask you something," she said softly. "It's about the changelings."

The other mare instantly tensed, her gaze flicking around the room. "I knew they'd be back eventually," Twilight replied anxiously. "What's happened? Have they foalnapped more ponies?"

"No, nothing like that. Twilight..." Celestia trailed off, hesitating for a moment as she chose her words.

Days ago, she'd been on the very verge of publicly announcing the treaty with the changelings when Chrysalis had ordered her not to. Twilight would never accept it, the changeling Queen had said. Twilight would say it was a trick, a lie, and she'd do all she could to destroy any chance for lasting peace. She was a very powerful alicorn, and she wouldn't stop until the changelings were driven to the very edge of the world. As badly as Chrysalis wanted peace, she couldn't take that risk for her hive. Celestia understood that - she'd feel the same way about her own ponies.

As long as Twilight opposed Chrysalis, there could be no peace. Not for changelings, not for ponies - only more decades and centuries of pointless wars and conflicts. Chrysalis regretted it, but could see no alternative but to withdraw from the peace accords - and leave Canterlot. Perhaps forever.

That was unacceptable. No matter how sincere Twilight's motives were, she couldn't be allowed to threaten all Equestria with her mistrust. She had to understand that the changelings wanted peace. She had to sign up to every provision of the treaty, becoming Queen Chrysalis's submissive slave slut, as Celestia had. That was why Celestia had asked - begged - Chrysalis to help her change Twilight's mind. Forcibly, if she had to.

And while Celestia knew her reasoning was pure and virtuous, while it was all for the good of the ponies of Equestria, for the peace and harmony of two races - she couldn't pretend it didn't also make her hornier than she'd ever been in her life. Because out of all her fantasies about Twilight, the one she'd always hungered for and needed the most was seeing her pure, innocent pupil lose herself to a hypnotic trance. To see those eager, intelligent eyes glaze over, hear the slurred monotone of mindlessness creep into her voice... stripping, a thoughtless doll, words sliding into her ears that changed her, made her hotter, sluttier, ready to fuck...

Celestia barely managed to hold back a moan. She wanted this so badly. But despite everything she'd told Chrysalis, she couldn't just do it. She needed to hear Twilight prove it was necessary, first.

Controlling her tone, she said carefully, "Take your time to answer. Do you believe that Queen Chrysalis can ever be trusted? Would you believe her if she offered peaceful cooperation?"

Twilight blinked, opening her mouth to reply at once, then stopped and thought again. Celestia watched with bated breath as her student unknowingly weighed her own future in the balance.

"I'm sorry, but - of course not. Chrysalis has shown us that she is willing to hurt us and lie to us to get what she wants. She hurt Cadance, she ensorcelled my brother - she invaded Canterlot! You know that I did my research after the invasion, and every mention of her in the histories says the same thing. Everything she's ever done has been based on lies and deception," Twilight said finally.

"Would you trust a single changeling?" Celestia asked.

Again, a pause for consideration. "Maybe. It would depend on their actions."

"But not Chrysalis."

"No. The risk would be too great. She's shown through her actions that she only wants to conquer us all - she only wants to hurt us." Twilight shook her head regretfully. "I think I could forgive her, if she was sincerely sorry, but I don't think she ever will be, and I definitely don't trust her." She paused, then looked up at Celestia. "She hasn't - have you heard from her? We should raise the guard, if she's back."

It was enough. A shiver of anticipation ran through Celestia, raising goosebumps on her arms. "Thank you for giving your judgement honestly, Twilight. I will consider what you have said. But you don't need to worry; you're here for another reason."

"Oh - I see." Twilight looked a little uncertain, then nodded and looked up at her mentor. A touch of worry in her voice, she asked, "Is there some sort of test I need to take?"

"No. Not a test." Celestia took a deep breath, her heart beating faster and faster in her chest. She was going to do it! After all this time, all her waiting and aching, she was finally going to do it! She'd never have had the courage without Chrysalis's command. Celestia knew she owed her Queen everything.

"This isn't a test," the Princess said again, more softly. "Come closer. Sit with me." Shifting to one side, she made enough room for Twilight to perch on the edge of her chair.

Her eyes full of puzzlement, Twilight obeyed. Crossing the room with small, hesitant steps, she sat down on the edge of Celestia's broad, throne-like chair, then looked over her shoulder at her mentor. "Is this right?"

"Yes. That's exactly right. Stay just where you are, Twilight." Her breath locked in her chest, her whole body tensely rigid, the elder mare reached out and ran her fingers softly down one of Twilight's folded wings. The feathers were incredibly soft under her fingertips.

She was touching Twilight. Of course she'd touched her before, but this was different. This was… the opening chord of an overture.

"…Princess?" Twilight breathed, radiating confusion.

"I have another question for you, my faithful student," Celestia told her, smoothing the younger mare's feathers into place.

"I - yes? Yes, Princess?" Twilight visibly endeavoured to look as though she wasn't at all distracted by what was happening.

For an instant, Celestia hesitated. If she said this, there'd be no way back. But… there was already no way back. Twilight was going to be an eager, hypnotised fuck toy, Celestia knew. They were going to serve Chrysalis together, and it was going to be… Oh, it was going to be so good. They'd fuck, they'd fuck day and night, obedient slave cunts to their Queen. All for the good of Equestria.

Shifting her hips, feeling the delicious pressure of the dildo buried in her dripping pussy, Celestia breathed into the other pony's ear, "Do you think I'm pretty?"

Twilight's jaw dropped. "Y-Yes! Yes, of course, you're - you're the Princess, you're Princess Celestia! You're the most beautiful pony in all of Equestria, everypony knows that."

"I didn't ask what other ponies think of me, Twilight." Celestia let her hand drift from Twilight's wing, over the young mare's shoulder, to gently stroke the side of her neck. "I asked what you think of me. Not as a Princess. Not as a ruler. As a mare. A mare like you."

"But-" Twilight protested, then broke off. It didn't matter; Celestia could read the incomplete thought as clearly as if it had been spoken. Twilight didn't - couldn't - envisage Celestia as just a mare like her. Exactly the sort of reaction that the Princess had always expected; the kind of reaction that made a relationship of equals utterly impossible.

It didn't matter. Soon, very soon, Twilight was going to learn to see her mentor in a whole new way. As a slavish, depraved whore, a slick, always-ready cunt, an eager mouth and a set of heavy, fuckable tits. No more isolation, no more suffocating respect. "Answer me, Twilight," Celestia urged softly.

Twilight stiffened further. It was impossible to tell what she was thinking. Finally, in a small voice, she admitted, "I think you're the prettiest mare that ever lived. I, um. I've always thought that."

Celestia leaned closer; just a little. It had been so long since she'd seduced a mare, she could barely remember that it had ever happened. A little shiver ran through her as she pushed past the last trace of the hesitation which had held her back for so long, and she breathed, "I think you've very pretty too, Twilight."

Twisting to look up at Celestia, Twilight's lips parted in soundless shock, her eyes wide. "But..." she protested again, seemingly unable to articulate any further than that. Her hand caught at the air, as though she could seize hold of a concept that would explain all of this. "...I don't understand."

"I know, Twilight. I've never let you know how beautiful I found you. Watching you grow up, watching that quick, alert intelligence develop into something amazing. You flowered into full-fledged marehood before my eyes... I couldn't tell you when I stopped simply being proud of you, and started to see not just a student, but something more. An equal. An adult. A pony that I could truly care for. My lovely Twilight," Celestia said softly, her words no less heartfelt for all the smouldering anticipation that lay behind them. It felt so good to finally confess the truth.

There was nopony she wanted more than Twilight. They were going to make such an amazing pair of submissive fuckdolls for Chrysalis.

"I... but... but you're..." stammered Twilight, each incomplete thought trailing off as another pushed it aside. "But you're Princess Celestia!" she finally burst out, having zeroed in on the very core of her disbelief. "I'm just a pony, and you're, you're you."

"You are an alicorn, Twilight. A Princess. Bold and brave, and fiercely intelligent. You are easily my equal, even if you have never realised it. And if you were not a Princess, it would make no difference at all. Love me, Twilight. Love me as I love you," Celestia urged, the words spilling from her faster now.

"I... technically, I'm a Princess, but-" Twilight began, her gaze flickering to Celestia's face, then away, over and over. Her cheeks growing darker as a hot blush coloured them, she finally managed, "You can't be confessing to me! This can't be happening! This would never happen!"

Without my Queen's encouragement... perhaps not, Celestia acknowledged to herself. But that didn't matter. Nothing mattered except the mare so tantalisingly close, so ready to be taken, to be trained, ready to be everything that Celestia had ever fantasised she would be.

No more hesitation.

Celestia took hold of Twilight's arms, and drew the smaller mare onto her lap. Unable to keep a smile from her lips at Twilight's wordless eep of surprise, Celestia leant in and kissed her.

Twilight's mouth was soft and sweet, her lips parting in surprise, and for a moment, she was as motionless as a doll. Celestia heard herself moan softly in delight, her tongue tenderly brushing her student's lips, and little by little, she coaxed Twilight into amateurishly returning the kiss. Celestia's eyes closed as she hungrily savoured the moment, a thrill of sensation tingling through her whole body.

After an eternity, they parted. Twilight's cheeks were flushed a deep red-purple, a dazed, giddy look on her face.

"Do you believe this is happening now, Twilight?" asked Celestia softly.

"...yes," the younger mare managed, her gaze flicking down to her lap.

"Did you like that?" Celestia coaxed.

"I - yes! But-"

"No buts, my faithful student. I have so much more I want to teach you. The ways of love. The ways of sex," Celestia breathed, her voice sinking to an intimate whisper on the last word.

"S-Sex?" stammered Twilight, her eyes wide.

"Oh, yes…" breathed Celestia huskily. "Yes, Twilight. Sex. I want you, so much. I've wanted you for years. You're so cute. I want you." Softly, Celestia's fingers played up Twilight's back, teasing and caressing her feathers, then slid into the wing-slit in her blouse to caress her smooth, warm skin.

Twilight gasped, shivering. "Oh, oh, oh…" she panted, seemingly unable to fit words together anymore. "I, I, please…"

"Do you find me beautiful, Twilight?" Celestia asked again, longingly.

"Yes! Yes, I, I do, I meant it, you're more beautiful than anypony that ever lived-"

"Do you find me desirable?" The question was softer, but no less heartfelt.

Grasping for words, Twilight nodded with jerky urgency, barely daring to look up and meet Celestia's eyes for an instant.

Celestia took Twilight's hands in hers and kissed the backs of them. She could barely breathe, her chest tight with emotion. "Touch me," she urged.

Disbelief painted Twilight's face, and she took a deep breath that then escaped her in a small whimper. "This has to be a dream…" she whispered, her hands reaching out towards Celestia, but hesitating just shy of brushing her mentor's body.

"Have you dreamed about me, Twilight?" Celestia leaned forward slowly, until the fabric of her bodice was just brushing the other mare's fingers.

"Yes… many times," Twilight whispered. With a subtle shiver, she let her hands uncurl, and let them cup her mentor's offered chest. Her touch was feather-light, as though she were cradling a young bird.

"I've dreamed of you, too," Celestia breathed. Inhaling deeply, she let her chest swell outwards against her student's hands, her thighs quivering as she fought the urge to begin grinding her hips back and forth. Her cunt was so wet, her panties sodden and translucent over the bulky base of the dildo buried in her. "I've dreamed of you playing with my breasts, Twilight. I've dreamed of kissing and touching you. I want to taste you, I want to lick your pretty pussy and kiss you after you've licked mine. I want to taste myself on your lips, oh Twilight…" The words spilled out of her, quicker and quicker as her self-control eroded under the relentless tide of her arousal. "I want to love your body in every way I can imagine."

"I… I've had dreams where you came to me and… told me that you wanted to… that we should go out on a date," Twilight confessed, her face crimson. "And we'd… kiss, and… more."

"Don't stop," Celestia urged, pushing her body against Twilight's hands. Wrapping her arms around the smaller mare, she began stroking Twilight's back again, gently teasing the purple feathers with her fingertips. "You're an adult mare, Twilight. I know it won't have stopped at just kissing. You must know that there is so much more to lovemaking." To fucking.

Twilight's cheeks were burning hot as Celestia kissed them. Nodding shakily, her eyes closing again, she panted, "I… I've never done anything like that with anypony, but I read Grayflank's Anatomy, and… and a lot of romance books, and they can be pretty clear what happens, and… you'd be so beautiful naked, I could picture it so clearly, I wanted to kiss every - every inch of you! I wanted you to teach me!"

"I will. I will," promised Celestia, aching with the sincerity of her words. The teasing lightness of Twilight's touch was almost unbearable; she wanted the other mare to be rougher, to strip her of her dress and expose her - but that wasn't the plan. She knew what she had to do.

"Please - tell me this is real," Twilight gasped, looking up pleadingly.

"This is real, Twilight. Would my faithful student like to hear her lesson plan?" breathed Celestia.

"It… yes, please, that would really help, I want to know what to do. I, I never studied for this!"

Celestia leant forward, her lips brushing Twilight's ear as she gently rocked her body up and down, pushing against Twilight's hands. "I'm going to strip you, Twilight," she whispered. "I'm going to take all of your clothes, and see that beautiful body of yours. And then, I'm going to tie you up. Would you like to know why?"

"You - you will? Why?"

"Because, Twilight, it will turn me on. I love restraints. I love chains and ropes. Will you be my pretty doll to play with?"

Twilight had to be restrained for the next part of the plan to begin. That was Chrysalis's demand, and Celestia had been more than happy to go along with it. They were so close to success. Once Twilight was strapped down, the brainwashing could begin, and she could be fully converted into a perverted, submissive slut. Heart in her throat, pulse hammering in her ears, Celestia waited for a moment that stretched to eternity for Twilight's answer.

"I will! I, I'll do it," Twilight stammered. Swallowing, her chest heaving with her rapid breaths, she let go of Celestia's chest and wrapped her arms around her mentor, pulling herself tightly against the older mare's warmth. "You're so wonderful, and I've - I've always loved you, and please, I - I'll do anything for you!"

"Then come, Twilight. Come with me."

With effortless strength, Celestia gathered Twilight against her and stood up, almost panting with excitement. Her thighs grinding against each other with each step, feeling the toy shifting in her sex like her Queen fucking her will, Celestia carried the smaller mare through several light, airy chambers into the room that had been so carefully prepared for this moment.

It was smaller than most of her chambers; taller than it was wide, intimately quiet - it had once been a place for meditation. Thick, abstract tapestries lined the walls, and a broad fireplace held a dancing fire, keeping the room pleasantly warm. Above a massive, ornately framed mirror, a round window of stained glass cast a beam of patterned light from high upon one wall, the colours falling across the single piece of furniture that dominated the room: a long, broad bench, like a massage table, solidly built of dark wood and softly padded. Heavy chains led from every corner, ending in thick white cuffs, with a wide collar on a very short chain that passed through a hole beneath where a pony's neck would rest. Two long, oval indents gave space for the captive's wings to be tightly bound.

The padded bench and restraints were pristine - barely used, if used at all. Nonetheless, the simple purity of the chamber betrayed a starkness of intent. This was now a room for one purpose only.

"Oh, my goodness..." whispered Twilight as she was set down. "I... this is all for me?"

"All for you, Twilight." It was what Twilight needed to hear. She wasn't ready to know that Celestia had already tested the soundproofing of the room to its limits, as Chrysalis had fucked her senseless over and over again. But she would be soon.

"So... what happens now?" Twilight asked, a shade nervously.

"Now, my sweet student, I undress you," cooed Celestia. Soon, she knew, it would be time to let Chrysalis take control - not just of what was happening, but of both of them. But this moment was hers, and hers alone. She'd waited too long not to take it for her own.

With tender purposefulness, her mouth met Twilight's. A low moan hung in the air, resonating from them both, as nimble tongues and soft, caressing lips stroked against each other. Celestia's eyes were closed, but nonetheless, she could sense every inch of Twilight's body pressed against her own. Gentle, milk-white hands worked down Twilight's blouse, undoing button after button, until it hung loosely open.

Celestia's heart thudded in her chest, her tongue exploring Twilight's mouth more deeply as she eased her student's blouse down her arms, over her wings, and let go. Yes. She took hold of Twilight's skirt and tugged it down, feeling the momentary resistance as it caught on the swell of her small ass, then the sudden slackness as it fell free. Yes!

Then, and only then, did she break their kiss and take a step back.

Twilight's face was flushed, her lips still parted yearningly, eyes wide with need. Her blouse was crumpled on the floor, her skirt pooled around her hooves, leaving her in a neat little white bra, black stockings and white panties that were stuck damply to her skin. "Princess," she whimpered, wings half-spread, her soft breasts rising and falling rapidly with her panting breath.

"How many times I've pictured this moment..." breathed Celestia, drinking in the sight to fix in her mind forever. She wanted, desperately, to keep stripping Twilight until her bare skin lay fully revealed - but this was as far as she was permitted to go. For now. Picking up a pair of slim wing binders from the bench where they lay waiting, she told Twilight, "Turn around, and fold your wings," with gentle firmness.

"I - yes, Princess," replied Twilight meekly, a shudder visibly running through her. Presenting her back, she folded her wings with a visible effort of will, her hands trembling.

Celestia's hands were trembling almost as badly. Her skin almost unbearably sensitive to the tingling, delicate brushes of Twilight's feathers, she tenderly wrapped the pure white strap of the first binder around one wing, and slowly tightened it. Biting her lower lip hard enough to leave marks, her breathing loud in her own ears, she reached out for the other wing, which jerked under her touch. Winding the other strap around Twilight's wing, Celestia delicately, little by little, tightened it until the wing was totally immobile.

Silence, coloured by the crackling of the fire in the grate, and the harsh breathing of the two alicorns. Bending, Celestia stroked her cheek against Twilight's bound wings and couldn't help her own sigh of light-headed arousal. "Lie down," she commanded, hearing her Queen in the echo of her own order.

"Y-Yes, anything!" Twilight backed up to the base of the padded bench, then, with a final nervous glance behind her, she pushed herself up onto it. Wriggling to settle her bound wings into the indents and making herself comfortable, she lay back full-length atop the padded softness, her eyes seeking Celestia's for reassurance.

"Breathe slowly and deeply," instructed Celestia huskily, moving to the foot of the bench. It felt as though she was moving in slow motion, every movement languid and weightlessly drifting. A sense of deep unreality pervaded the scene; she'd pictured it and fantasised over it so many times that it felt like echoes were rippling from her limbs, ghosts of all the ways she'd imagined this.

The first white cuff tightened around Twilight's left ankle.

This was real.

With gentle pressure, Celestia spread Twilight's legs apart, exposing the scrap of damp, translucent cotton that covered her sex, then wrapped the second cuff around her other ankle and buckled it tightly. It would have been easy for Celestia to use her magic for this; to animate the chains and lock the cuffs using nothing more than an effort of will. But, no, this moment was something to be cherished. To be felt under her hands.

Twilight shivered, desperate yearning on her face, as her left arm was tenderly cuffed to the upper corner of the bench. It had been built to hold Celestia herself, at the direction of Queen Chrysalis, strong enough to absorb the fullest extent of her strength. The thick chains clinked dully as they were drawn taut. "I can't believe this is happening," Twilight panted giddily.

"Nor can I," replied Celestia, with a breathy giggle. Leaning over the bench she kissed Twilight again, deeply and intensely, before stretching out her other arm towards the corner of the bed and buckling the broad cuff, leaving the young pony spread-eagled and completely restrained. Then, with deep, trembling arousal, Celestia watched herself carefully wrap the wide collar around Twilight's neck and lock it shut.

Oh yes, oh please, Celestia whimpered inwardly, barely able to contain the quivering of her knees as she gazed at her bound, captive student. Cuffed, collared, enslaved, even if Twilight didn't know it yet. Her cute, innocently white underwear begged to be ripped apart, torn from her body, and her black stockings felt so good to caress.

But there was one more thing to do. Twilight was restrained, but not helpless. Not as long as she could still use her horn.

"Close your eyes," Celestia said in a low, intimate tone. Then, as Twilight obeyed, lips already parting in anticipation of a kiss, Celestia slid a silver ring from her dress and smoothed it down the length of Twilight's horn, to rest neatly at the base.

Twilight's eyes shot open. "My magic!" she gasped.

"It's okay, Twilight. It's okay," soothed Celestia. "I've bound you. You wouldn't be my beautiful captive pony if you could just undo all of your restraints with a flick of your horn. Relax. This is what is meant to happen."

Taking a deep breath, Twilight slowly relaxed again. "I - sorry, that makes sense. Yes." Giving a few exploratory tugs at her chains, a strange expression came over her face, and she added more softly, "I've never felt like this before. I feel so - so helpless. Like you can do anything you want to me, and I can't stop you… I'd never try to stop you, please, please touch me!"

"I will," promised Celestia, knowing it was both entirely true and utterly misleading. "Keep breathing deeply. I want to put on something special for you."

Moving to the doorway, she looked over her shoulder at the half-naked mare lying completely restrained and helpless, patterned by the coloured light falling from the window above. She lingered there for a moment, imprinting the sight indelibly into her memory, and breathed, "Soon." Then she slipped through the half-open door and closed it behind her.

Elegantly, as though trained for it all her life, Celestia slid smoothly to her knees before a figure that looked exactly, in every detail, like herself.

"My Queen," Celestia panted, shivering with pleasure, her breasts heaving with her rapid, shuddering breaths, "Twilight is ready for you to brainwash now."

Author's Note

Oh, the cruelty of Celestia's confession under these circumstances! As a side detail, Twilight's stockings stop just above the hooves, since shoes are very rare in this version of the setting and full stockings would wear out immediately.

• Proofing and suggestions by Equimorto and DbzOrDie