Lesson 1: Obedience

Princess Luna sat on the balcony overlooking Canterlot and watched as the sun began its ascent into the sky.

Some might have called it dawn.

Luna called it teatime.

This was their ritual; the two sisters were only commonly awake in the early mornings and the late evenings, as one of the heavenly bodies they controlled was replaced by the other. And so, twice a day, they made time to meet over a shared interest, and that interest was tea.

Today's teatime, though, would be special.

Today, she was going to take the first major step towards getting her revenge.

Luna took a sip from her cup. Hers was a lavender tea, made from bulbs cultivated in her own section of the gardens. Brewed to ease stress and relax the drinker before bed.

Celestia's, on the other hoof, would be earl gray, brewed with the express purpose of keeping her alert for the rest of the morning. At least, it normally would be.

Luna looked across the little table, upon which sat their twin tea sets, and off the side of the balcony. You could see the entirety of the city from up here.

"Good morning, Luna," came Celestia's gentle, melodious voice. Her sister strode past her, to the seat on the other side of the table.

"Good morning, sister," Luna replied. "You are well, I hope?"

"Just fine," Celestia said. Her horn glowed, and her porcelain tea set came to life. "How were your nightly duties?"

"Uneventful." Not entirely true; there had been a number of ponies who had needed her attention, and she'd spent a fair amount of time assessing Celestia's own dreamscape, as well. But nothing good would come of mentioning that now.

Luna took another sip from her cup, inhaling a breath of its lovely fragrance, then laid it to rest on its saucer. Meanwhile, Celestia was allowing her own cup to steep.

"Well, uneventful is good," she remarked.

"Mhm."

Luna picked up the teaspoon that sat at her place and ran it around the edge of her teacup, letting the liquid inside swirl. As the spoon completed its circle, she let it clink softly against the side of the cup before beginning again. She watched her sister's reaction carefully.

She'd been working on Celestia for months. She'd started small; tiny prods at her subconscious, whispers in her dreams, a word here, a light trance there, gradually opening Celestia's mind to her manipulations.

Now it was time to see if her work had paid off.

"You look tired, sister," Luna said.

"Do I?" Celestia asked. "I thought I slept quite well last night."

"Yes," Luna said. Her spoon continued to make circles, clinking against the side of the cup at perfect intervals. "You look very, very tired."

Celestia blinked. "Well, I... suppose I do feel a little bit sleepy, now that you mention it. But I'm sure I'll feel better once I've had my tea."

"Only a little?" Luna asked her, keeping her voice soft and even. "To me, you look exhausted. The stresses of the day must weigh heavily on you, sister."

"Things have been quite hectic in day court as of late," Celestia admitted. "The Solstice Summit is coming up. Foreign dignitaries will be arriving in three weeks, and there's so much to prepare..."

"Easy, sister," Luna said. "There will be time for worrying later."

Celestia smiled at her. "You're right. I should be focused on enjoying your company, not complaining about work."

Luna smiled back. She eyed her sister's teacup; it would be nearly ready by now.

"Would you like to try some of my tea instead?" she asked. "It's very soothing. IT could help to take your mind off of things for a while."

"It smells heavenly, but I really shouldn't," Celestia said. "I need to be at my best for my subjects today."

"But how can you be at your best if you're so stressed that you can barely stand?" Luna inquired, sounding innocent enough.

The effect of the suggestion was almost immediate. The crease in her brow deepened, and her movements became unsteady. She really did look tired, now.

"Just look at yourself, sister," Luna said. "You're a mess."

"Maybe you're right," Celestia said, eyeing her shaking hands. "Maybe I have been... overdoing it lately..."

"Let me make you some tea."

Luna's horn began to glow, and her tea set became animated. She kept the movements of the utensils rhythmic and slow, letting Celestia's eyes track their movements in time with the rotations of her spoon.

The scent of lavender suffused the air. Celestia's eyelids began to grow heavy.

Soon enough, the drink was prepared; Luna floated it over to her sister, who took it up in her shaking hands. She raised it to her lips, inhaled a breath of the warm aroma, then took a sip.

"It's good, isn't it, sister?" Luna asked.

"Yes," Celestia said. "It's quite lovely."

She took another. She smiled. "I'm starting to... feel better already."

She didn't seem to notice the lapse in speech.

"Just let yourself relax, sister," Luna said, continuing the movements of her spoon, keeping its chimes regular as she studied her sister's face and gauged her control. "You deserve this."

Celestia took another draft of the tea. "Mmm... I suppose I do."

Luna stood up from the table, letting her magic continue to animate the teacups' movements. Her hips swayed back and forth as she strode over to Celestia's side, at much the same tempo as the spoon's. She could feel Celestia's eyes following her. The black dress she was wearing didn't leave much to the imagination.

She slid around behind her sister's chair, placing her hands delicately on her shoulders. Her thumbs began to press and knead the muscles between the shoulder blades. As she did this, she began to channel a little magic through her fingers, not enough to notice, but definitely enough to have an effect.

"Nnn... a massage?" Celestia said, turning to putty in her hands. "Luna, I didn't know you knew how to... to..."

The end of the thought seemed to escape her. Meanwhile, Luna found a particularly tight knot of muscle and pressed her thumb into it, rubbing into the skin in circular motions as it dissolved under her touch. Celestia's neck arched.

"Ooh... right there..."

"Focus on your breathing, sister," Luna said. "Long, slow, calming breaths..."

Celestia moaned again, melting under Luna's attention.

"Luna, w-what..." Celestia fought for the words. "Why... is it getting so hard to think...?"

"Don't worry, sister," Luna said, running her hands over her sister's shoulders. "You want to help your subjects, don't you? Just focus on your breathing and the sound of my voice. Let it relax you further..."

"O-oh... okay..."

"Don't you trust me, sister?"

"Of course I... trust you..." Celestia said, her eyelids beginning to flutter.

Luna's left hand slid over Celestia's shoulder and across her collarbone, slowly, letting her thumb brush the skin. It slipped under the neckline of her dress, reached down, across her chest, further...

Luna's hand wrapped around her sister's breast. She gave it a light squeeze, then slid her fingers under it, cupping it and pushing it up. Her thumb began tracing slow circles around the pink flesh that surrounded Celestia's nipple, letting it draw close but never quite touch the quickly-perking nub.

A blush began to spread across Celestia's pale cheeks. "W-what are you..."

"I'm helping you to relax, sister," Luna said, as she continued to massage her sister's areola. "That's what you wanted, isn't it? To relax?"

"Yes, I... suppose so..."

"Then close your eyes," Luna said. "And listen to my voice."

Celestia's eyes drifted shut.

"Clear your mind," Luna instructed. "Let all of your worries, all of your stress, flow from your mind, like water from a spring. Let the tension in your body..."

She kneaded out a particularly tight piece of muscle, and Celestia moaned again.

"...disappear under my touch."

"L-Luna," Celestia gasped. "This is... amazing..."

Luna smiled. "I'm glad you feel that way, sister. It's about to feel even better."

Luna's hand moved from her shoulder and slid gently down the outside of her sister's thigh, slipping under the cut of her dress, then came creeping back up, this time on the inside.

Luna felt her sister stiffen as her hand got a little too close. She paused.

"Relax, sister," she murmured. "Everything is okay. I am here. Just relax..."

Celestia, after a moment, obliged. Luna's fingers continued their trip upwards, their tips brushing along the sensitive area, until they met cloth.

Luna cupped her hand gently over Celestia's panty-covered marehood, applying just enough pressure to make Celestia groan.

"Do you feel at peace, sister?" Luna asked.

"Yes..." Celestia said, her words sluggish and tired.

Celestia's panties were pushed aside. The tips of Luna's fingers brushed against her labia.

"But you could be more at peace," Luna whispered, as if this were some great secret. "There are still worries that plague you, buried deep within your mind. You could be more relaxed."

"I... could?"

"You could," Luna affirmed. She ran a finger up the length of Celestia's slit; her sister shivered. "You want to be fully relaxed, don't you? You need to be, for the sake of your little ponies. Isn't that right?"

"Yes..."

"I can help you," Luna breathed into her ear. "Do you want me to help you, Celestia? Do you want me to drive all those pesky worries out of your head, forever?"

As she said this, her fingers pressed into Celestia's tender skin, and she spread her cunt like a fan.

Celestia seemed to hesitate, and for a moment Luna was worried she'd pushed too far, too quickly. But then she let out a breath.

"Yes, sister. Please..."

Luna's smile grew wide.

She'd won. Her sister's mind was at her mercy.

"You're such a good girl, Celestia."

Two of Luna's fingers slid easily into her cunt. Celestia moaned, and then moaned again when Luna's thumb brushed the hood of her clitoris.

Luna began probing Celestia's folds. She'd never been so intimate with her sister before, only in her fantasies; to do so now was... she ran her tongue over her lip. Exhilarating. A heat began to grow in her own nethers as she continued her slow, careful ministrations.

She found a particularly sensitive spot, and Celestia's thighs clenched.

"I can feel you getting close, sister," Luna said, smiling, as Celestia's slick folds clamped down around her fingers.

"Anh... hah..."

"But don't come yet," Luna said. "Not until I tell you to. Do you understand?"

"Ah..."

"Do you understand?" Luna growled, digging her fingers into Celestia's sensitive mare-meat.

"Ah! Y-yes, sister!"

Luna's grip relaxed, and that sweet honeysuckle voice returned. "Good girl."

She slipped her thumbnail under the hood of Celestia's clit and slid it out of the way, then began to run her thumb around it, just barely brushing against the edge of the sensitive, swollen nub.

"Your worries are melting away, Celestia," Luna said. "Your mind is emptying of thought. Can you feel it?"

"Yes..."

"It feels good, doesn't it sister?"

"Ah! Yes..."

"This is the pleasure that comes with obeying me," Luna told her. "Only when you let me control you can I make you feel this good. If you let me do your thinking for you, then you'll never have to worry. Do you understand?"

"Yes..."

"Are you enjoying yourself, sister? Be honest, now."

"Y-yessss."

"And if you're enjoying it so much, then you must enjoy being obedient, right? Do you enjoy being obedient, sister?"

"Ngh... yes!"

"Do you want to keep being feeling this way, sister?"

"Yes!"

"Then you must stay obedient," Luna said. "Right?"

"Yes."

"Forever."

"Yes," Celestia moaned. "Yes! Ah!"

"Good girl," Luna said. "It's time for your first lesson, Celestia. Are you excited? I'm going to drive those worrisome thoughts from your head forever. You are excited, aren't you?"

"Yes, sister!"

"Repeat after me."

Luna's attentions to Celestia's body continued, even as she worked; Celestia's labia was becoming quite slick, now, but still she managed to hold back her climax as Luna had ordered.

"Obedience is pleasure," Luna said.

"Obedience... is pleasure," Celestia grunted.

"Pleasure is obedience."

"Pleasure is obedience!" Celestia squealed.

"Again."

"Obedience is pleasure. Pleasure is obedience!"

"Again!"

"Obedience is pleasure! Pleasure is—agh, oh—obedience!"

"Again!"

On and on it went, as Luna etched those two phrases into Celestia's mind. They would become her mantra; the foundation for everything else Luna was going to teach her.

The tension in Celestia's body continued to mount, building up inside her until she could barely contain it. She shook under the strain, gripping the edge of the seat for support.

"O-O-Obedience is pleasure! Ah! P-Pleasure is—is—is obedience!" She was beginning to cry, now, her body not knowing what else to do. "Obedience is pleasure! Pleasure is obedience! Obedience is pleasure! Pleasure is obedience! Obedience is pleasure! Pleasure is obedience!"

Luna caressed her sister's cheek. "I'm proud of you," she said. "You're doing so well. I think that's enough."

Celestia trembled under her touch. Luna let her fingers grow still, simply allowing them to fill her sister's dripping cunt. Celestia let out a needy little whine, and the sweet sound made Luna's own nethers twitch.

There was only one thing left on Luna's lesson plan for today, but she'd need to reach even farther into Celestia's subconscious to do it.

"I want you to count backwards from ten for me, sister," Luna whispered into her ear. "Slowly. Would you do that for me?"

"Y-yes."

"Good," Luna purred. "Begin."

"T-ten..."

"And with each number you count..." Luna said.

"Nine..."

"...you become more and more relaxed..."

"Ei-ei-eight..."

"...and Celestia sinks further and further down..."

"S-s-s-se—ah—seven..."

"...down into the soothing, peaceful darkness..."

"Ssssssix..."

"...leaving your mind blissfully empty..."

"Ffffffive..."

"...and your thoughts blank..."

"Ffffffour..."

"...and your consciousness an empty shell..."

"T-threeeee..."

"...ready to be molded..."

"T-t-twooooo... anh..."

"...into whatever shape I desire."

"Ooooooooneeeeee..."

Luna twisted her fingers in Celestia's needy snatch as she said the last number. Her sister didn't even react, too far gone and too busy trying to hold off her own orgasm.

"Z-zerooo-o-o-o..."

"You've done so well, sister," Luna said. Celestia hung limp in her grasp, panting. "I promise, you'll be rewarded... just as soon as I've sown the seeds of obedience into your subconscious. Are you ready? Say, 'yes, sister'."

"Y-yes... sister."

"Listen to my words carefully," Luna said.

"When I dismiss you from this trance, you will return to your normal self, and you will not remember any of this. Say, 'yes, sister'."

"Yes, sister."

"From now on, you will obey any command I give you that ends with the words 'dear sister'. You will do so without question, and you will not stop until the command has been fulfilled or I command you to stop. Say, 'yes, sister'."

"Yes, sister."

"When I say the words 'teatime, dear sister', you will once again remember being hypnotized by me, but you will not remember being in a trance. You will also remember all of your lessons, starting with the one I taught you today, and everything that has happened during teatime going forward. Say, 'yes, sister'."

"Yes, sister."

"And when I say the words 'teatime is over, dear sister', you will forget it all again and return to your normal self. You won't even realize you've forgotten anything. This will also awaken you from your trance. Say, 'yes, sister'."

"Yes, sister."

"And finally," Luna said, her tongue darting across her lower lip, "whether you are awake or entranced, whether it is teatime or not, your orgasms are reserved for me and only me. You will not be able to climax during sex with anyone but me. You will not be able to relieve yourself unless you are thinking of me. Even the slightest hint of sexual desire will bring the thought of me into your head. Do you understand? Say, 'yes, sister'."

"Yes, sister."

"Very good, Celestia," Luna cooed. "You've been such a good girl."

Luna's smile grew wicked.

"Now come for me, dear sister. Harder than you ever have before."

Celestia's hips jerked as the floodgates opened. Her head flew back,but Luna clapped her free hand over her mouth, muffling the grunts and shouts as her cunt squeezed down around Luna's fingers and a flood of sticky juices spurted from her hole. Her eyes rolled back into her head as the flow continued, dripping down onto the seat of her chair, dribbling down and collecting on the floor. There was so much of it; Luna wondered just how long she'd been pent up, and the thought made her wet.

At last, with one final gasp, Celestia's body fell limp once again. Luna pulled her fingers out of her sister, a trail of marecum following them. She put them to her mouth, licking some of Celestia off of them. She smacked her lips. Her sister tasted good.

"Did you enjoy that, sister?"

"Guh... huh... yes..."

"That is the pleasure of obedience," Luna told her.

"Yesssssss..." Celestia moaned. "Obedience... is pleasure..."

"You're such a fast learner, Celestia."

Luna bent down and kissed her sister. It wasn't long, but it was more than passionate.

Stepping back, Luna looked what was left of her sister up and down. Celestia sat slumped in her seat, shivering but otherwise motionless. Her eyes were Luna's.

"You've made quite a mess, haven't you, Celestia?" Luna said, pointing at the trail of Celestia's juices that began at her pussy and stretched down her chair and to the floor. Her dress was in quite a sorry state, as well.

"I'm sorry," Celestia gasped. She meant it, too.

"Oh, Celestia," Luna said. "You don't need to apologize to me. I will get it cleaned up. But as for you..."

She sat on her sister's lap, straddling her thighs and looking into her eyes.

"Once I release you from your trance, you will go to your quarters. You will take the longest route through the castle. You will not notice that you have come, or any signs that you have done so, and you will not be able to understand anyone who asks or points it out to you."

"Yes, sister."

"Once you reach your chambers, you may put on a new dress," Luna continued. "But I forbid you from changing your panties or washing yourself for the rest of the day. You will not be able to smell your arousal, but everyone else will. Do you understand?"

"Yes."

Luna darted in for another peck at her sister's full lips, before drawing back and standing up. She replaced her sister's soaked panties and smoothed out her dress, then circled back around the table and sat down.

"Teatime is over, dear sister."

Celestia awoke with a start, her sleepy demeanor suddenly refreshed and alert.

"Are you okay, sister?" Luna asked. She wanted to cover her bases. "You spaced out there for a moment."

"Did I?" Celestia said. "I hadn't noticed."

She stood. Her stained dress swished about her feet; she showed no signs of noticing.

"Hmm. I feel wonderful," Celestia said, taking a deep breath of the cool, crisp mountain air. "Ready to face the day. I do so enjoy these little meetings of ours, sister; if only they needn't be so brief."

"Yes," Luna said with a smile. "I feel the same. Now go on; your duties await."

"And have a good day, Celestia," Luna murmured as Celestia walked away. "Your real training begins soon."

Luna smiled as she thought over what that training would ensue. Chains, whips, ropes, belts, collars... Oh, the possibilities!

It would have been easy for Luna to have taken over Celestia's mind entirely. If she'd wanted, she could have had her perfect slave then and there. A few whispers, a little magic, and Celestia would have been hers forever.

But Luna didn't want a mindless slave; for a thousand years of enforced abstinence on the Moon, such a fate would hardly be a fitting revenge. No, Luna wanted her sister, broken and obedient, to worship the ground she stood on and grovel at her feet. And achieving that conquest would be a slow, painful process... for one of them.

She licked her lips. "Oh, sister. You and I are going to have so... much... fun."

Lesson 2: Restraint

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Celestia took a sip from her cup and sighed. "This is lovely, Luna. I should have asked to try your blend years ago."

"I'm glad you enjoy it, sister," Luna replied, smiling. "It took me a long time to get it right."

Two days had passed since Luna had first taken Celestia's mind, and in that time Luna had carefully watched her sister for any signs of her control breaking.

It had been simple things; she'd started by asking her to do things she'd never object to normally. Fetching her trivial objects from around the castle, or answering simple questions. When there had been no deviation, she'd begun to escalate. Asking her to sit out on important meetings. Asking to attend them in her stead. Asking her to sway this or that way in matters of state, even if she'd been leaning the other way previously.

There had been no resistance so far. Now, it was time to see how far she could push it. She needed total control over her sister's body before she could continue Celestia's training, and Luna was itching to begin the next lesson.

But—all things in good time.

"How go the preparations for the Solstice Summit?" Luna inquired, taking a sip from her own cup. She'd given Celestia the same lavender blend as before, but for herself, just now beginning her night, she'd prepared a second-flush darjeeling. A personal favorite of hers.

She'd waited for evening tea, this time; the sky framed behind her sister had taken on an ever-darkening orange hue. She'd have all night with her sister.

She intended to use all of it.

"Oh, just as frustrating as always," Celestia said, frowning. "I swear, arranging meetings with foreign dignitaries is worse than herding cats."

"Some of the dignitaries are cats," Luna pointed out. "Partially, in the case of the griffons."

"Don't remind me." She sighed. "I'm glad Griffonstone is finally starting to get its act together, but Godfried... well, I hate to speak ill of a fellow leader, but..."

"He's certainly no Grover," Luna said.

Celestia smiled. "That he isn't."

She took another sip of her tea. Her eyes settled on something curious.

"Is that a new necklace, Luna?" Celestia asked her, gesturing towards the thin chain that wrapped around her neck and disappeared beneath the neckline of her dress. "I don't think I've seen you wearing one before."

Luna smiled, her free hand drifting to her breast. "Oh, yes. But it's not anything worth concerning yourself with, dear sister."

Celestia blinked. Her mouth opened slightly, as if she was going to say something, but closed again.

She frowned. "I'm sorry, I seem to have lost the thread of conversation. What were we discussing?"

"The preparations for the Summit," Luna said. She fixed her sister with a worried look. "Are you okay, sister? You seem a bit off today."

"I..." Celestia's frown deepened. "I do feel a bit... strange..."

That would be the wiltweed I put in your tea, Luna thought to herself. Not like Celestia needed to know that.

Celestia's hands had begun to shake. Abruptly, she set her teacup down and stood up, leaning against the table for balance.

Luna gave her a little push with her magic, enough to upset her footing but not enough to be directly noticeable, and Celestia stumbled. She caught herself by the edge of her chair.

"Sister!" Luna said, standing herself. "Are you alright?"

"Perhaps not," Celestia admitted.

Luna circled around the table and slipped her arm around Celestia's shoulders, letting her lean on her for support.

"Let me take you back to your room, dear sister. Obviously you need a rest."

"I..." Celestia's expression clouded for a moment. "Yes, okay."

She smiled, weakly. "Thank you, Luna."

By the time they had reached the door to Celestia's bedchambers, Celestia's condition had improved, though not by much. She no longer needed Luna to support her, but she stuck close to her side just in case.

As they approached the room, the two door guards snapped to attention.

"My sister is feeling unwell," Luna told them. "I will be staying by her side tonight."

"Should we fetch the royal physician, your highness?" The guard on the left asked.

"No need; it is nothing serious. I will call for her should her services be required. Unless I do, no one is to disturb us."

"Yes, your highness."

The guards opened the door for them, and Luna led her sister inside.

The doors fell closed, and Celestia continued forwards. Luna, however, first made sure the doors were locked. Her horn flashed, and a set of wards applied themselves to the door and walls. Soundproofing charms—Luna didn't want the guards outside hearing. With another flash, a cloth bag appeared at her side; she set it aside for the moment.

Preparations complete, she turned around to see her sister, leaning against one of the high posts of her lavish bed. Celestia's room was large and spacious, with three great windows set into the back wall, allowing the light of the stars to softly illuminate the room.

"Feeling better, dear sister?" Luna asked.

Celestia took a deep breath.

"A little," she said. "I think it's passing, whatever it was..."

"That's wonderful to hear," Luna said. She placed her hand on Celestia's shoulder. The older sister looked up at the touch.

"Teatime, dear sister."

Celestia's eyes unfocused. Her posture relaxed, her expression fell blank and her breathing grew even.

Luna watched her sister carefully. She'd returned to the trance Luna had left her in, several days before—that was good, though somewhat unexpected. But had she retained her memories?

"What is obedience, sister?" she asked.

"Pleasure," Celestia responded. Luna grinned. She had her. Luna licked her lips in anticipation as her hypnotized sister stood obediently before her, awaiting her next command.

Time to begin.

"Strip for me, sister."

Celestia hesitated... but just for a moment. Obedience was pleasure, a voice—her own voice—reminded her, whispering in the back of her mind.

She bent down, took the soft material of her gown between her fingers and slowly pulled it up, revealing first her ankles, then her thighs, and then her chest as it was pulled over her head. Celestia clung to it, nervous, but Luna nodded to the side and the dress was discarded.

Celestia's hands moved next to the straps of her bra. Her undergarments were a light pink; they fell away in mere moments, releasing their bountiful treasures. She stood there, naked and shivering, and it occurred to Luna that she hadn't seen her sister entirely nude since they were children.

She beckoned Celestia forwards, away from the bed and her discarded clothes, until she was in the middle of the floor. Luna circled around her, drinking in the view.

"I'm going to teach you something wonderful tonight, dear sister," Luna declared.

Celestia said nothing, her eyes simply following Luna's movements.

"Tonight, I'm going to teach you who you belong to."

Luna stepped in closer, moved around to her sister's back. She ran her fingers up Celestia's thighs and over the shapely curvature of her ass, and then, gently, she took Celestia's hands by the wrists and guided them behind her back.

"What is pleasure, sister?" Luna asked, mirroring her earlier question.

"Obedience," Celestia replied.

Luna's horn lit. The bag she had summoned opened, and a length of black fabric, no wider than two fingers, slithered out. Luna pulled it through the air, letting it snake past Celestia's face, let it brush against her cheek as it flew so she could get a good, long look at it.

"Obedience to me," Luna said. She brought Celestia's arms into position, forearms together, the fingers of each hand resting against the other arm's elbow.

"And if obedience to me is pleasure," Luna continued, her voice dropping to the gentle, even cadence it had adopted on the balcony previously, "if giving up your will to me is pleasure... then what must it feel like to give up your body, as well?"

Celestia didn't understand what she meant, at first—but then the fabric slipped around her wrists.

It slithered up her forearms, wrapping them tightly together. The material was smooth, and soft against her skin—but it was strong. She could feel that as it tightened down, not enough to hurt, but enough to tell her that it wouldn't be coming off any time soon.

Luna stepped in close, pressing her own body against Celestia's back. Her arms wrapped around her, the fingers of her right hand beginning to trace slow circles around her sister's bare middle at an even, familiar tempo. Her other hand hugged Celestia to her, resting just under her breasts.

Celestia's vision began to lose focus.

"What is being bound, relinquishing control of your body, if not a fuller expression of obedience?" Luna asked the air, as her magic pulled tight the knot that held the fabric in place.

A blush came onto Celestia's features that hadn't been there before.

"And doesn't it feel so nice," Luna said, her fingers spiraling lower, "to let me have you? To let me bind you, to so thoroughly display your obedience?"

Celestia nodded, as Luna's fingers reached her nethers.

"If obedience is pleasure, then to give yourself over to me like this must be pure bliss," Luna murmured into her ear. Her hand slipped over her sister's lower lips. They were moist.

"Your body belongs to me, Celestia," Luna said, pressing gently against the folds. "To do with as I please."

She pressed her palm against Celestia's skin, letting her middle two fingers hang tantalizingly close to her entrance.

"And you love it," Luna continued, "because pleasure is obedience."

"Pleasure is obedience," Celestia said back, automatically.

"And to be bound is a symbol of that obedience. Say it, sister."

"To be bound," Celestia repeated, "is a symbol of obedience."

Luna ran her middle finger up the length of Celestia's cunt, stopping just short of her clit. Celestia shuddered against her.

"To be bound is to let me take possession of your body."

"To be bound is to let you take possession of my b-body."

Another stroke up Celestia's marehood.

"To give up your body to me is bliss."

"T-to give up my body to you is bliss," Celestia moaned out. "Nnn..."

"To be bound by me is bliss."

"To be bound by you is bliss, sister."

"To be bound is to be obedient." Luna's thumb brushed against the hood of her sister's clit.

"T-to be bound is to be obedient!" Celestia gasped out.

"And obedience," Luna said, bringing everything full circle, "is pleasure."

"Obedience... is pleasure."

Luna sank two fingers into her sister's thirsty cunt.

Celestia gasped, her entire body quaking under the sensation.

"My, sister. We are needy today, aren't we? Did you miss my touch that much?" Luna said, curling her fingers up at the first joint. Celestia let out a short squeal as the invading digits began to dig into her in repeated, even motions. At the same time, Luna's other hand began playing with her breast, squeezing and kneading it to that same, mesmerizing tempo.

Celestia's head titled back, and her eyes raised to the ceiling. Her breaths were short, quick, becoming quicker with each stroke.

"Ah-nnn..." she moaned. "L-Luna..."

"Do you want more, sister?" Luna asked, grinning like the devil as she continued her ministrations. The question was punctuated by another brush of her clit.

"Yes!" Celestia gasped. "P-please!"

Luna's horn lit. The bag she had brought with her opened once more, and a series of belts and straps flew out of it. They were made from smooth leather, or something that looked like leather, and the low light played off of their surfaces.

She let them lazily snake their way over, drawing them past so Celestia could see. She felt her sister's marehood quiver, and grinned.

The first belt was wide, and short. It wrapped itself around Celestia's ankles, pulling them together and tightening down. Another pair, these thinner, snaked their way around her thighs, biting gently into the flesh around her cutie mark. They pulled tight, and Celestia let out another moan as her cunt was constricted around Luna's playful fingers. The dark black material stood out proud against her pale coat.

Magic took hold of Celestia's wings, folded them tightly against her back. Twin belts slipped around the second joint of each, binding the two halves of the wing together and preventing them from being spread. A second set of belts then wrapped around Celestia's chest, one over her bosom, the other sliding under, binding both her arms and her wings firmly behind her.

Celestia moaned as Luna's fingers withdrew. The princess of the night stepped around to her sister's front, examined her handiwork. Her sister was completely bound, immobilized, and helpless before her.

Perfect.

Well, almost. Something else floated from Luna's bag, falling heavily into her palm. A simple bit gag, secured by a set of straps that wound under the muzzle and around the back of the head. Old-fashioned, perhaps, but Luna always had enjoyed the classics.

"Who does your body belong to, sister?" Luna asked.

"Y-you, sister," Celestia gasped.

"You're such a fast learner, Celestia."

Luna pressed two of her fingers—still wet with her sister's juices—against Celestia's lower lip, then forced them into her mouth. She could feel Celestia's tongue in there, brushing against her fingertips. Gently, she pulled her sister's mouth open, inserted the bit, and pulled her fingers away, a thin trail of drool following them.

"Bite," she commanded, and Celestia did so. The straps wound around her head and muzzle and were tightened down by the glow of Luna's magic.

Luna reached out, cradled one of Celestia's breasts in her hand. The bindings around her chest forced them outwards, making them appear even more luscious than they already were. She rubbed her thumb across the nipple, and Celestia shivered.

"You're beautiful, sister," Luna said, drawing her hand back.

There was just one piece of the ensemble left, and Luna had it in her other hand.

It was an inhibitor ring, a wide-banded circlet of black iron with ancient runes engraved across its surface. It hinged at the back, and a clasp at the front held the keyhole which would lock it in place.

The clasp was shaped like a crescent moon.

She held it out to her sister, letting it rest heavy on her palm. "Do you know what to do with this, sister?"

Celestia nodded. Her horn lit a golden yellow, and her aura engulfed the ring. It snapped shut and levitated up, above her head, stopping just an inch above her horn.

"Good girl," Luna said with a smile. "Put it on, dear sister."

The ring slid slowly Celestia's horn, coming to a rest near the base. Immediately, her magic aura flickered out.

Luna reached under the collar of her dress and pulled up the chain which Celestia had noticed earlier. Hanging from the end of it was a tiny silver key.

She slipped the chain over her head, let it hang from her fingers. Celestia's eyes had focused on the key, which swung back and forth under her palm.

"One twist of this key," Luna said, "and you will be helpless. Your body will belong to me. Totally..."

Luna's hand drifted forwards. The backs of her fingers pressed lightly against Celestia's collar bone, traced downwards between her breasts.

"Utterly..."

Her caress continued down her stomach, brushing past her navel.

"Mine."

Her touch brushed once more over Celestia's marehood, wet and needy. Luna's fingers came away damp; she made a show of placing their tips in her mouth, licking them clean.

"You want that," Luna said. "Don't you, sister?"

Celestia nodded, letting out a whine past the gag.

"Good girl."

The key twisted in its keyhole, and Celestia was hers.

Luna smirked. She stepped back, and her sister sagged at the new distance between them. Celestia knew what she needed.

But Luna had other plans.

"Wonderful," she said. "You've done so well, Celestia. But now... "

She trailed her fingers down Celestia's cheek. Her index finger slid under her chin, tilted her head up so she was looking directly at her.

"...awaken from your trance, dear sister."

Celestia's eyes closed. When they re-opened, the difference was clear—before, she had looked tired, content. Now, her eyes were alert... and quickly settled into panic, darting around, trying to comprehend where she was and why.

She began to struggle. She tried to lift her arms, but the belts held them firm. She tried to spread her wings, but that had been taken from her, too. She tried to speak—but the straps around her muzzle held her jaw firmly clamped around the bit. All she could get out was a muffled "Mmmph!"

Her eyes flicked to Luna, questioning and frightened. A mighty blush had broken out in her cheeks. Luna relished the sight.

"Hello, sister," she said, softly. Confidently.

Celestia tried to say something, but it was lost to the gag. Still, the intent was clear.

"Untie you?" Luna chuckled. "Why would I do something like that, sister? You were the one who asked me to do it."

She gestured to her sister's crotch. "And clearly you've been enjoying it too, so I don't know why you'd want to stop now."

Another bark through the gag.

"Why?" Luna echoed. Her grin grew devilish. "Isn't it obvious? Revenge, my dearest sister."

Celestia tried to walk, but the belts around her legs held firm, and, eyes flying wide, she began to topple forward...

...only for Luna to catch her in her arms.

"Careful, sister!" Luna grunted. "We don't want you breaking that pretty face of yours. Not yet, anyway."

Gently, she lowered her sister to the ground, into a kneeling position.

"Don't look at me like that, Celestia," Luna said, noting her sister's glare. She'd seen that look before. "You owe me this much. Don't move, dear sister."

Celestia froze in place (much to her own shock, given the look in her eyes), and Luna stood up.

"Really, sister, a thousand years on the moon? Alone? Did you think I was just going to forgive you for that?"

She walked over to the bed, retrieved her bag.

"No. I've been planning this since before my return. It was a very different plan at the time, of course; I hadn't factored little Twilight and her friends into the equation, but..."

Celestia's head jerked up at the mention of her pupil.

Luna set the bag down beside her sister's shaking form and squatted down in front of her. Reaching out, she cupped Celestia's chin, forced her to look at her.

"I'm going to turn you into my willing slave, Celestia," Luna declared. "And you're going to repay me for every minute of my banishment. You can understand that, can't you?"

Celestia's look could have melted steel... but there were also tears welling up in the corners of her eyes. Smiling mischievously, Luna darted in, kissed her sister's gagged lips, the glare disappearing in an instant and a look of shock tanking its place.

"Of course, being such a good sister," Luna said, drawing back, "you'll do whatever it takes to make me happy, right?"

She stood back up, circled around behind Celestia.

From the bag, she withdrew two items. She'd picked them up in Canterlot, in one of the stores that only opened at night. She'd been under a guise at the time, of course, but—well, she'd been pleasantly surprised, to say the least. Her ponies had been busy, these last few centuries.

She planted a sandaled foot on the back of Celestia's head and forced her to the floor, leaving her ass stuck up into the air. Luna was presented with two holes, one already wet with lubrication.

Out came the toys. The first was larger, and shaped like a stallionhood; the smaller bulbous, and flanged. Each was a dark black, the same color as her restraints. The back of the plug had an emblem of Luna's moon painted onto it. It matched the one around Celestia's horn.

She pressed the larger of the two toys against her sister's folds, brushing against her clamped-down legs. Magic spread her lower lips to accommodate its head. At the same time, the other toy floated up and pressed against Celestia's ass, prying the tight little hole slightly open.

Celestia's breathing became more panicked. Her eyes darted around, trying to see what Luna was doing, but she couldn't move her head, stuck as it was being ground into the marble.

Luna let the moment hang, longer, longer, and then...

With one quick thrust, both toys forced their way into their respective holes. Celestia shrieked into the gag, her eyes wide in shock, pain, and pleasure.

"Mmm, so tight, sister," Luna teased. "How long have you gone without a good rutting? A century? Two?"

She removed her foot from Celestia's head, but the mare remained where she was, unable to move under her sister's command. Wrapping her hands around Celestia's shoulders, she pulled her back up to a sitting position. Celestia was crying properly, now, she noticed. Good.

Conjuring another belt from within the bag, this one with clips on either end, she affixed one end to the belt over Celestia's breasts, looped it around under her, and affixed it to the back side of the same. Tightening it down, the thin black material disappeared between her legs, pushing the dildo in deeper and eliciting a second, quieter squeal.

Luna slipped her arms around her sister's shoulders, leaned in close enough that the material covering her own breasts pressed against her captive's bound wings. "Enjoying yourself, sister?" she murmured.

When she got no response, she gave the belt holding the toys in place a tug, eliciting a gasp. "It's rude to ignore a question, Celestia," Luna purred. "I said, 'are you enjoying yourself, sister?'"

Fearful, Celestia shook her head.

"No?" Luna sounded almost disappointed. "Well, I'm sure you will. After all, the night is still young..."

One hand drifted down, traced the outline of the toy in her sister's snatch. She called upon her magic, not to cast a spell, but to activate the enchantment already woven into the material of the toy. Celestia gasped as the dildo began to vibrate, first slowly, then quickly picking up speed. It would change intensities once every few minutes, the deviant shopkeep had said. "To keep them on their toes."

Her ponies had come up with such clever things during her absence.

Celestia's eyes clamped shut, and her head fell back as she moaned into her gag.

"See?" Luna said. "I told you you'd love it."

She pushed the thing in deeper, held it there with her fingers, and got another moan for her troubles.

"Unfortunately, as much as I would love to keep playing with you until you break, sister," Luna said, letting up the pressure, "I have duties I must attend to in the dreamscape."

She stood up, leaving Celestia kneeling on the floor at her feet. Her sister's eyes were wide, looking at her in panicked confusion.

"But I'm sure you'll be fine on your own, won't you, Celestia?"

She bent down, brought her muzzle to Celestia's ear.

"Just don't forget," she whispered, voice heavy and mischievous. "You can only come for me, dear sister."

Straightening up again, she ignored her sister's cries into the gag. She turned away—but paused. A devilish grin spread across her features.

Turning around, she slipped the key to the inhibitor ring off of her own neck... and draped it over Celestia's.

"Have fun," she said, turning away one last time and leaving Celestia a quivering, damp, moaning mess behind her.

She laid down in Celestia's massive bed, letting the silk and cotton pool around her, and closed her eyes.

Her eyes opened again, a moment later, but not to the sight of her sister's bedroom.

The dreamscape took on many forms, depending upon the state of her ponies' collective unconscious. Today, it was a vast beach that stretched off forever, an equally infinite ocean lapping at its shores. The skies were orange and purple, though there was no sun to be seen, and the water reflected this.

Luna's bare feet left footprints in the wet sand as she walked. A flash from her horn, and hundreds, no, thousands of doors appeared before her, stretching off to the horizon. Behind each of these doors, Luna knew, was a dream.

And behind some of them, she also knew, lay nightmares. She could feel them, the afflicted ponies' minds calling out to her for help. And she would help them, soon enough.

But time meant little in dreams, and there was one pony's mind in particular she planned to visit tonight. Nightmare or not.

The doors slid past, at a blinding pace, until at last the one she was looking for appeared. It settled into the sand at her command. Emblazoned upon it was a six-pointed star.

She wrapped her hand around the doorknob and pulled it open.

Luna opened her eyes.

The first thing that hit her was the stench of her sister's arousal, thick and heavy in the air. She breathed in deeply, savoring it.

By her own estimate, she'd been in the dreamscape for several hours. Grinning in gleeful anticipation, she sat up and turned towards where she'd left her sister.

Celestia sat in a pool of her own juices. They poured out of her stuffed hole, around the dildo, leaving sticky trails in their wake on their way to the floor. She hadn't moved, but her eyes, rolled up into her head, had glazed over. Saliva dribbled down her chin past the gag, mixing with the streaks of tears running down her cheeks. Her breaths were deep and labored.

Luna's tongue slid over her lower lip. "My, sister," she purred. "You've held out so well..."

Her only response was more ragged breathing.

"Not that you had much choice in the matter." Luna slid off the bed and strode over to her sister, her black dress trailing along behind her. She knelt down, ran her fingers through Celestia's mane.

"You're such an obedient little pet, Celestia. I'm proud."

She pushed the belt around the toys to the side. The dildo slid out with an audibly wet noise; the thing was drenched, a trail of nectar stretching after it as Luna pulled it away, as if unwilling to give the toy up.

"Hah... a-ah," Celestia gasped as the thing was dislodged fully, her glistening marehood now fully exposed to the cool castle air. Its lips were puffy and stressed from the hours of abuse they'd just suffered, but the night wasn't over yet.

Luna's horn glowed, and the straps restraining Celestia loosed themselves, sliding sensually across her pale skin. The gag undid itself and was gently extricated from her mouth.

The plug in her ass, however, remained where it was.

"Well, sister?" Luna asked. "How do you feel?"

Celestia's mouth moved, but all that came out was half-formed gibberish. There was no room for thought left in her head; hours of pleasure and denial had driven it out.

Luna chuckled. "Just what I wanted to hear."

She placed her fingers on Celestia's sternum and gave her a gentle push, sending her sprawling to the ground. Another flash of her horn, and Celestia's wrists were pinned to the marble.

"I could take you now, sister," Luna said, walking her fingers down Celestia's chest. "Or would you prefer I leave you like this? Miserable, unsatisfied..." She saw the growing look of panic in her sister's clouded eyes, and she had to fight the urge to start taking care of her own needs right then and there.

"I could tie you up again," Luna continued, trailing her fingers across Celestia's stomach, playing with her. "Put the toys back in. It would be easy enough to impersonate you; I could keep you here for months..."

Luna's cruel touch came so very tantalizingly close to Celestia's needy folds, but diverted at the last second, tracing a line down the inside of her thigh, instead.

"N-n-n-n-n—"

"I wonder how much of you would be left," Luna asked the air, "after a year?"

Celestia shook her head emphatically, her long hair, normally so beautiful but now matted from sweat and sex, becoming even more unkempt. "N-n!"

"Oh?" Luna said, feigning surprise. "Then you'd prefer to let me ravage you? I am the only one who can give you release, after all... but think of your image, sister. Surely it wouldn't do for a crown princess of Equestria to let herself be used in such a manner?"

Celestia bucked her hips at her. Tears rolled down her cheeks.

"I see," Luna said, smirking. "Then remember, Celestia: you begged for this."

She slid her hands under Celestia's knees and pulled her up gently, let her sister's legs fall over each of her shoulders. Her arms wrapped around them, hands spreading her thighs, supporting Celestia's weight but still leaving her upper back pressed into the ground. Her now-unbound wings spread instinctually, her pristine feathers drawing trails through their owner's stale fluids.

Luna bent her head down. The stench of her sister's arousal was overpowering as she brought her head between Celestia's legs. She let her muzzle draw agonizingly close to the red, puffy folds—but held back, instead looking down, into her sister's eyes.

Celestia's gaze was lazy; unfocused. "Look at me, sister," Luna commanded.

With some effort, her eyes drifted to Luna's face.

Luna kissed the inside of her sister's thigh, sucking the skin between her teeth and giving the sensitive flesh a little nibble. Celestia moaned at the tease, and another gush of fluid came bubbling up from between her folds.

Sear this image into your mind, Celestia, Luna thought. I want to see it in your dreams tomorrow.

Luna's tongue darted forward. The taste of her sister filled her as she ran it up the inside wall of Celestia's marehood.

Celestia jerked, but Luna held her firm as she went in for another taste, slowly trailing her tongue up the other side, savoring it. Celestia howled, even the slightest touch an agonizing jolt of ecstasy after being kept on edge for so long.

Luna's tongue traveled bottom-to-top, slow, even motions, rubbing and prodding as it explored her sister's dripping caverns. Celestia's tongue lolled out of her mouth. Her hands grasped and ungrasped at nothing, still pinned to the ground by Luna's magic. Her body jerked again as Luna flicked her tongue upwards, tracing a teasing circle around her clitoris before descending back down.

Celestia's gasps turned to squeals. Luna could feel her getting closer, closer, her folds clenching around her eager tongue. Up to the clit, just for a second, then back down again. She increased the speed of her movements, pushing Celestia closer and closer to the edge, letting her hang there, one moment, two moments, and then...

Luna slid her tongue upwards, kissed Celestia's clit. Her teeth squeezed the little nub and Celestia screamed as she finally came.

Her body spasmed, twisting under Luna's firm grasp. Her thighs tried to squeeze together, but Luna held them apart, letting Celestia's marecum flood out. Luna lapped it up, and Celestia came again, her back arching as she squealed.

Now, at last, Celestia was spent, falling limp in her sister's grasp, her chest heaving.

Luna released her magic and her sister's legs. Celestia collapsed to the floor, a sticky, sweaty mess. There was nothing regal about her now, Luna thought. She looked like a back-alley whore, used and then discarded.

The thought made Luna very, very hot.

Celestia's dry gasps shook Luna from her thoughts. Turning around, she retrieved the last item from her bag of tricks—a canteen of water. Unscrewing the lid, she knelt down and brought it to her sister's lips.

"Drink up, sister," Luna said. "Quickly, before you pass out."

Celestia dutifully gulped down the offered water, then collapsed again. This time, her eyes fluttered closed and stayed that way.

As the last of her consciousness faded, Luna bent down and whispered into her ear.

"Teatime is over, dear sister."

And with one last moan, Celestia fell unconscious.

At the back of Luna's mind, she felt a light tug; turning her attention to the window, she saw her moon slowly descending towards the horizon. It was dawn.

Closing her eyes, she reached out with her magic. Not to the moon, which was already dutifully on its way. No, she reached past it, to the great, flaming ball of plasma that sat below the eastern horizon.

She gave it a pull. It was resistant, at first, but quickly settled on its track across the heavens. The sky turned gray with the dawn, and Luna smirked. The sun already obeyed her. Soon, so would its master.

Turning her attention back to the mess on the floor, she gently lifted her sister up in her magic. Her head lolled. Luna chuckled.

"Come along, sister," she said, turning towards the door that lead to Celestia's private bath. "Let's get you cleaned up."

Lesson 3: Discipline

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With a gasp, Celestia shot up in bed, clutching the covers to her chest. The cool night air of the castle caressed her sweat-soaked skin, and her breaths were heavy.

Normally, for her, this would indicate that she'd had a nightmare... but her forehead wasn't the only part of her that was wet.

Her face flushed as she played back the dream she'd just had. The princess didn't often remember her dreams, but this one was particularly vivid.

It had been a long time since she'd thoughts like that. And certainly never about her sister!

But still, the image of Luna's head between her legs, her dexterous tongue tending to her needs...

She flushed harder.

Across the castle, eyes still closed, Luna snickered.

"Good morning, sister," Luna said, stepping out onto the balcony. "Your dreams last night were pleasant, I hope?"

Celestia, froze, teacup halfway to her mouth. A rosy blush lit her cheeks.

"Yes," she replied, quickly regaining her composure. "Why do you ask?"

Luna took her seat. "Mere curiosity, dear sister. You made me promise never to peek into your subconscious when we were fillies, remember?"

This was true. At least she could take solace in that. She allowed herself a smile and finished her sip. Today, she had opted to go with something exotic: a box of leaves that had been gifted to her by Mistmane, the sorceress. She had called it "Bai Jiguan". Celestia called it delicious.

Luna was staring at her. Her own tea set remained untouched.

"Is something wrong, Luna?" Celestia asked, setting her cup down on its saucer.

"Not at all," Luna replied. "Teatime, dear sister."

Celestia's eyes unfocused. Blinked. Focused again. Focused on Luna's face.

"You..."

Celestia blinked again, suspicion creeping into her eyes.

"You did something to me—"

Her eyes widened as the memories came flooding back. She leapt out of her seat, horn flaming like the sun, wings stretching out like a vengeful archangel.

"Who are you," Celestia growled, the question less of a question and more of a demand. "What have you done with Luna. And what have you done to me?"

Luna rolled her eyes. "Sit down and put your horn out, dear sister. We need to talk."

Celestia's legs bent at the command, and she scowled at their betrayal. The flames went out. The wings folded. The look of unfathomable fury, however, remained the same.

"That's better," Luna said, once Celestia had taken her seat. "As for your questions: I am your sister, I haven't done anything with myself, and... well, I think you know what I've done to you." She grinned. "Quite vividly, if your dreams last night were anything to go by."

Celestia shook her head. "You're lying. Luna would never—"

"That's funny," Luna said. "I seem to recall you saying the exact same thing a thousand years ago."

Celestia's breath caught in her throat.

"But the past isn't what's important right now, sister," Luna said. Something teleported into her hands, but she kept it hidden from Celestia. "We're here to talk about your future. Do you remember what I told you, the last time I let you out of your cage?"

She said nothing.

"Being defiant, are we?" Luna said. "Well, savor it while you can."

She stood up, still keeping the thing in her hand concealed, and strode around the circumference of the table, trailing the fingers of her left hand around its edge. "I suppose I can say it again, for your benefit. Don't move, dear sister."

Once again, Celestia felt control over her limbs leave her.

"I'm going to take you..." Luna said, approaching her. She placed her hands on her sister's shoulders.

"I'm going to break you..."

She swung her leg over Celestia's, straddling her, and sat down on her lap. She looked down at her sister with that same, sultry grin, and draped her arms across her shoulders.

"And I'm going to make you mine for the rest of eternity."

Celestia glared up at her. "Is that what you think is going to happen?" She forced out a chuckle. "Then I'm afraid you're going to have your work cut out for you, because I will never let that happen."

"You won't, will you?" Luna said. "Then tell me: what is obedience, Celestia?"

"Obedience is pleasure," Celestia said, automatically. Her eyes widened a moment later as she realized what she'd uttered.

"And who does your body belong to?"

"You," Celestia said, before she could stop herself.

Luna laughed. "It sounds to me as though you've already started to accept your new role, sister. And you were quite eager, the other night... or have you forgotten?"

"Trickery and deceit," Celestia said, a little too hurriedly. "You were controlling me."

"I was doing no such thing," Luna said. "Prevented you from escaping, perhaps, but I never commanded you to beg for my ministrations... or to enjoy them."

Celestia opened her mouth to retort, but before she could utter a single syllable Luna darted in and locked lips with her. Celestia's eyes widened in shock as Luna's hands gripped the back of her head, forcing her into the kiss.

Luna pulled out of it just as quickly. She glanced down.

"I also didn't command your body to do this," she said with a smirk, lightly flicking the visible outline of Celestia's rapidly-perking nipple against her dress. "I did make you unable to notice that you weren't wearing any undergarments, though. Like the good slut that you are."

Celestia flushed. How could she have possibly—

Luna slid off of her, the lengths of her black dress swishing about her ankles, and Celestia finally caught a glimpse of the thing her sister had summoned. It looked like... leather? And something on it had glinted in the breaking sunlight.

Celestia swallowed. She didn't like how warm her cheeks were getting. Luna was facing away from her, and she could see every inch of her shapely behind.

"I refuse to believe that you are Luna," she said.

"Would you prefer it if I were Nightmare Moon?"

"Nightmare Moon was destroyed." Celestia said. "By the Elements of Harmony."

"And yet, here we are. Your sister once again standing over you. And you helpless before me."

"Then that's what this is about," Celestia said, grasping at anything that made sense. It was working; some of the fire had returned to her eyes. "You're attempting to bring about eternal night again."

Luna laughed and turned around. "Oh, Celestia, why would I want to do that? Ponies grew to appreciate my work in your absence, despite your crude mishandling of it. The night is more appreciated now than ever before. Making it eternal would only bring resentment where there is none."

She stepped forward, slid a finger under Celestia's chin.

"No," she said. "I don't want night eternal. I just want you."

Celestia swallowed again.

"But as I said before, we aren't here to talk about the past," Luna said, drawing back. "We're here to talk about your future."

She placed the thing she'd summoned down in the center of the table.

A band of dark-stained leather, smooth and pliable, with a silver buckle securing it at the back. A steel ring hung from a loop opposite, and beside it, burned into the material with the moon at the center cut out completely, was the image of Luna's cutie mark. There was no ambiguity as to the collar's purpose... or who the owner of its recipient would be.

"And this," she said, "is your future."

"You expect me to wear that?" Celestia said.

"You will," Luna promised. "Quite willingly, by the end of today's session. You'll never want to take it off."

"I don't know how you've returned, monster," Celestia spat. "But whatever it is you have planned, I will stop you."

"Oh? But how are you going to do that if you can't even stop yourself?" Luna asked, amused. "Stand up, dear sister."

Celestia stood.

"Strip for me, dear sister."

Off came the dress, discarded to one side. The warm morning breeze brushed against her bare skin, her erect nipples, and the exposed lips of her marehood.

Luna summoned something else from the void, another recent acquisition from her trips into the seedier part of Canterlot. They looked like a pair of evening gloves, but they were black, and made of a shiny, rubbery material. She pulled them on, the cool, smooth latex encasing up to her forearms and molding to every curve.

She gave her fingers an experimental flex. She liked what she saw.

"On your knees, dear sister."

Celestia knelt, her knees pressing into the cold stone of the balcony. She continued to glare up at Luna, struggling not to show how hot each successive command was making her.

Luna circled around behind her. Much like she had during their previous encounter, she planted the tip of her sandal into the space between Celestia's wings and pushed her forward, sending her off balance. This time, however, Celestia was allowed to catch herself, and she did, her hands pressed against the floor.

"Hold that pose, dear sister," Luna said. "And try not to collapse before I'm done with you. I'd hate to have to start again."

With another flick of Luna's horn, the bag from the previous night appeared on the table, as well as something else, which fell to the tabletop with a metallic ring. The bag opened, and the pair of wingbinders emerged, flying over and sliding their elastic selves over Celestia's wing joints.

They were soon joined by the other object: a rod of metal, connected on either side to a par of cuffs. Celestia had never seen anything like it before. Magic spread her legs apart, revealing her dampness. As the manacles clicked shut around her ankles, she felt a twinge in her nethers. Why?

Because to be bound is to be obedient, a voice at the back of her mind whispered. To be bound is bliss.

With both ankles firmly fastened to the bar, Celestia's legs were forced apart. There was no hiding her shame now.

"Eager as always, I see," Luna commented. "You're such a good student."

A moment later, and Celestia let out a grunt as a sudden weight settled on her back. Luna had taken a seat on her, using her as a throne. Luna crossed her legs, and she placed her hands on Celestia's back, one between her wings, the other tantalizingly close to her ass.

"You're almost ready to begin," she said. "But first... how about we make things a little more fair?"

From the bag emerged the inhibitor ring. It floated over, hung in front of Celestia's face.

"I know you know what this is," Luna said. "And I know you know what it does. So how about we see if your will to defy me is really as resilient as you say, hm?"

The ring flew up, out of Celestia's vision, but she felt it as it slid slowly down the length of her long horn. It fell into place, and a moment later, she heard the lock close.

And then another object was dangled in front of her. It was the key, still on its silver chain.

"You may use magic again, dear sister," Luna said. Celestia frowned.

The key dropped to the stone, right in front of her, just inches away from either hand.

"There," Luna said, a tone of smug certainty in her voice. "All you have to do is reach for the key, Celestia, and you'll be able to free yourself. From where I'm sitting, I probably wouldn't even notice until it was too late. You could vanquish me in an instant."

Celestia's heart leapt, and she strained to reach for the key... but her hands remained firmly planted on the ground.

"Of course," Luna continued, "I've ordered you not to move from that position."

She ran her gloved fingers through Celestia's hair.

"But all it would take is one moment," she said. "One moment of self control, and you'll be free. So tell me, Celestia: do you think you can overcome the need to obey that I've so lovingly etched into your brain? Because I'll warn you: by the time I'm finished with you today, you won't have it in you to try any more."

Celestia said nothing. Everything she had was focused on the key. Regain her self control for just a moment? She would do more than that. She'd show the Nightmare that her will could never be broken.

Her arms began to tremble as she tried to will them forward.

Luna laughed. "Defiant until the last, I see. Very well. Then we'll begin."

She turned her attention back to the bag at the table, but paused.

"Oh, and sister... try not to make too much noise," Luna said. "I've made it so that the guards can't hear you, but I've done nothing to stop your precious subjects from seeing what a slut you are."

This was a lie, of course; she wasn't that careless. Not that she'd be telling Celestia that.

She smiled, shifted her weight a little. Celestia's body held firm under her. The stage was set; it was time for today's lesson.

All that was missing was her tool.

Out of the bag it came, floating over to her. Celestia hadn't even noticed.

Luna reached out and took hold of the riding crop. It had a nice heft to it, and it felt good in her latex-coated hand. The degenerate shopkeeper had been right; the gloves did feel amazing.

She ran the end of it across Celestia's cutie mark, traced a circle around her sun. If Celestia noticed, she didn't react.

"I've already taught you the pleasure of obedience," Luna said, continuing to run the crop across her sister's skin. "And you've learned it so well. But today, I'm going to teach you the consequences of disobedience."

With that, Luna levitated the crop around Celestia's backside, trailing it across her thigh and the curves of her ass.

Celestia suppressed a gasp as the end of the crop prodded at her marehood. It pressed against one wall, exposing the caverns inside, and then let it snap back into place. The touch of the cool leather was... intoxicating.

Then it pulled away and—

Thwack!

Celestia grit her teeth as the crop came down on the delicate skin of her ass. She wouldn't scream. She wouldn't give this creature the satisfaction.

Luna pulled the crop away, leaving a bright red welt on Celestia's skin.

"I'm going to teach you what you deserve," Luna said.

The crop returned to Celestia's marehood, the end tracing up and down her puffy folds, threatening to penetrate but never quite getting there.

"And I'm going to teach you to like it."

Thwack!

On the other side, this time. Celestia shouted into her teeth. Another red mark to match the first, and damp with her own fluids to boot.

Celestia forced herself to keep her eyes on the key. If she could keep her focus on it, empty her mind of anything else, then just maybe...

Thwack!

Back on the right side, just inches away from the previous. Tears sprung to Celestia's eyes, but she ignored them.

Luna's gloved hand slid across the raw flesh on Celestia's thighs, her fingers tracing the marks. The cool kiss of the latex soothed each angry welt it touched. Celestia shuddered. It almost felt... good.

"Enjoying yourself yet, sister?" Luna purred, alarming Celestia with how accurately she'd mirrored her own thoughts. "But we've only just started!"

Twisting her hand around, Luna summoned another familiar item from the depths of the bag: an anal plug, emblazoned with the crescent moon. Reaching down, she rubbed the tip of the thing against Celestia's puckered hole, then slowly, so slowly, pressed it inside.

Her hole was more receptive to the plug, this time, loosened from its previous encounter with the silicone toy. It hurt less as it finally popped into place... but the sensation of fullness somehow felt even better.

Then down came the crop again.

Thwap!

Right across her cutie mark. Her body shifted slightly, on instinct alone, and the movement only served the highlight the feeling of the object that had claimed her ass. Celestia bit down on her lower lip. She was beginning to shake, and the heat kept rising...

The end of the crop pressed into Celestia's clit, making her shudder. Half a second later, and Luna's icy fingers descended between her legs.

She bit back a moan. No. She wouldn't break.

The touch started where the crop ended, just below her clit, and trailed upwards, across the length of her slit. Luna's fingers came away wet; the lubrication coating the latex only made the next pass even more pleasurable.

Celestia tasted the faintest trace of iron as her teeth punctured her lip, but she kept her focus on the key. No matter what Luna did, she had to keep focused on—

The crop came down again, harder than before, and in the same moment Luna's fingers pushed their way inside her.

This finally unsealed Celestia's lips; she gasped at the twin sensations. The lasting sting of the crop bled into ecstasy as Luna curled her fingers inside of her. She moaned; she couldn't stop herself.

Luna chuckled. "You make the sweetest noises, sister."

She continued her ministrations, keeping an even, familiar tempo. Every few strokes of pleasure were punctuated by the pain of the crop coming down on her sensitive flesh.

Celestia arched her neck, gritting her teeth together as her breaths grew more and more ragged. Each lash against her skin made her muscles tense, clamping down and rubbing against the invading objects in each of her holes. Her legs tried to clench together, but the bar held them firmly apart.

"I can feel you getting close, sister," Luna said. "But remember: your body belongs to me, Celestia, and so does that delicious cunt of yours. So don't come yet, dear sister. Not until I allow it."

She punctuated the statement with another strike from the crop, again across her cutie mark. The impacts had stained each sun red.

Celestia whimpered. Marecum bubbled out of her with each movement of Luna's fingers, dripping down in long, sticky strands to the growing puddle between her legs.

Luna once again rubbed the end of the crop against Celestia's clit, eliciting another moan and soaking the leather implement in her juices. She trailed it slowly up the inside each of her sister's thighs, leaving wet trails across the sensitive skin. Then—Thwack! Thwack!—she produced red marks across both of them.

"Ah!" Celestia cried, squeezing her eyes shut. Luna smiled. Music to her ears.

She continued working Celestia's marehood, swirling her fingers about for good measure, but she withheld the crop. Instead, she ran her gloved fingers lovingly through her sister's long, multicoloured hair.

Celestia gasped for breath and tried to set her focus on the key again, in this moment of respite. It was still sitting there on the stone, as close as ever. If she could just—

"Well, sister?" Luna said. "How are you feeling?"

Celestia ignored her. She focused all of the will she could muster on her right hand. Luna had commanded her to hold this pose... but there was a way to do that and get to the key. She just had to play Luna's game: go slow.

Her fingers curled and pulled her hand forward, barely even a millimeter, keeping the palm down against the ground. Even though it was almost no progress, it sent a wave of hope crashing through Celestia's mind. She might have started to cry, if the sting of the crop hadn't already coaxed out her tears.

Luna, however, didn't like being ignored.

"I said," she growled, grinding the tips of her fingers into Celestia's insides. "How are you feeling, dear sister?"

"Agh!" Celestia gasped out, her mouth moving on her own. "It, it h-hurts, Luna! It hurts so good!"

Luna's grip relaxed, and her tone returned to its normal purr.

"I see you've finally accepted that I am, in fact, your dear little Lulu."

Celestia bit her tongue.

Luna let out a laugh. "What pushed you over the edge, sister? The realization that no one else would ever be able to make you feel this way?"

The statement was punctuated by another grind from Luna's fingers, making her moan.

"Or did you just finally decide to stop lying to yourself and admit that you were wrong?"

"I didn't—"

"One thousand years I spent on the moon, sister," Luna said. "Alone, in the body of a goddess."

"That... wasn't you," Celestia grunted out. "Nightmare Moon—"

Luna snorted. "We were one and the same, Celestia. Nightmare Moon was me. I was Nightmare Moon."

"N-No..." The heat in her nethers was growing too hot, now, the pleasure building against the wall Luna had erected in her mind. She felt like she'd been placed in a pressure cooker, like she was about to burst...

"Why do you tell yourself such lies, sister?" Luna said, her voice like velvet. "Is it because you couldn't believe your sweet, innocent little sister would dare to disobey you? To hate you?"

The crop trailed across Celestia's thighs.

"Or..." Luna said, "was it just to make yourself feel better about what you did?"

Celestia said nothing, her head hanging, everything she had going to trying to hold herself together, to move her hand forward again before she broke forever—

Luna leaned down, whispered into her ear.

"If that's true, sister, then you really do deserve this."

Thwap! Celestia screamed as the crop struck her clit. Twin waves of pain and pleasure swept through her, crashed against each other with such force she thought she might be broken apart. Her wings strained against their bonds, trying to flare out on instinct.

Luna's free hand began to trace slow circles along Celestia's back, between her wings, and her thoughts began to cloud.

"This pain excites you, doesn't it, sister," Luna said, not so much asking a question as stating a fact. The crop came away, and it came away wet.

Celestia moaned, all self control gone after Luna's last strike, struggling to come back.

It didn't get the chance. Once again, the crop came down on her clit, paired with another thrust from Luna's fingers. Her moan turned to another scream.

"Do you know why?"

Again. A spurt of marecum erupted from Celestia's snatch as she squealed.

"It excites you because it is mine."

Celestia shook, the manacles around her ankles clanking.

"Obedience is pleasure," Luna said, rubbing the crop against Celestia's red, puffy nub. "But you've been disobedient. You've been trying to disobey me this whole time. And so you must be punished."

She pressed the tool down, hard, into Celestia's button, and got another squeal.

"But accepting that punishment," Luna continued, "is just another expression of obedience, isn't it?"

The crop let up for just a moment before it struck her again. This time, she didn't scream. She moaned.

"And to be punished by me is just another form of my taking ownership of you," Luna said. "And to be owned by me is bliss, isn't it, sister?"

"Y-yes!" Celestia shouted, and was rewarded with another strike from the crop. "Ah!"

"And you deserve it, don't you?"

Silence.

Thwack!

"Don't you?"

"Yes!" Celestia cried out. "I deserve it!"

"You want to be punished for your disobedience, don't you, sister?" Luna said. "If it brings you this much pleasure?"

"Yes!"

"You enjoy being punished for your disobedience."

"Yes!"

"You enjoy being praised for your obedience."

"Yes!"

"You want more."

"Yes! Please, sister!"

Thwack!

"Agh! Ha... ha..." Celestia's lips had turned upwards, into a smile.

"You deserve this."

Thwack!

"You deserve every minute of this, Celestia."

Thwack!

"And you love it."

Celestia moaned, and panted. Drool dripped from her mouth. Cum dripped from her reddened snatch. Sweat dripped from her brow. The key glinted on the stone, ignored.

Luna pressed the crop into her clit again. "Do you want to come, sister?"

"Ah, yes, please Luna, ah..."

"Are you going to obey me from now on?"

"Yes!"

"Willingly?" She ground the crop in harder.

"Agh! Yes!"

"Then I suppose you deserve your reward, for being such a good slut," Luna said, smiling. "Come for me, sister. Come as hard as you can."

"Ah... ha... AHHH!"

Celestia erupted. Luna pulled her fingers out just in time, as wave after wave of Celestia's juices flooded out of her puffy folds. Her entire body shook, trembled with each spurt of her orgasm. She tried to keep upright, but her body wouldn't obey and her arms gave out, sending her pitching forward, breasts and cheek grinding into the stone under her sister's weight. She twitched, moaned, twitched again as her arousal puddled behind her.

Luna slid off of her sister's back, watched as she came, and came again. The thing on the floor wasn't Celestia; it was an animal, reduced to pure instinct as her mind deserted her. She smiled, and lifted the dripping fingers of her left hand to her mouth. Her tongue slithered across the smooth latex, savoring every drop of her sister that remained on them.

Eventually, Celestia stopped twitching, and the stream from her marehood turned into a slow drip. Her moans turned to shuddering gasps as her lungs heaved for air.

Once Celestia had just begun to catch her breath, Luna squatted down next to her.

"I told you not to collapse, sister." Her smile was cruel as she bent the crop in her hands. "You know the punishment for disobedience..."

Celestia said nothing, too far gone to reply.

Luna flipped her over onto her back. Celestia's arms splayed to either side while Luna sat atop her, straddling her stomach. Celestia could feel the dampness seeping through her sister's underwear as it pressed into her skin.

The crop slid under Celestia's chin, forcing her head back, then trailed down, tracing over her collar, along her breasts.

Then, grinning, Luna brought the crop down laterally, cracking it across both of Celestia's thick, aroused nipples.

"Gah-AH!" Celestia screamed. Her hips bucked.

The crop returned to Luna's magic. The cold latex made her shiver as Luna grasped her breasts and began to play with them, kneading and squeezing in all the right places.

She felt the end of the crop brush against her folds, her legs forced to accept it by the spreader bar. It forced its way inside, making her tense up as the foreign object began to roughly fuck her. It penetrated deep, deeper than Luna's fingers ever had.

And Luna didn't let up, either, continuing to massage her supple breasts. She took Celestia's nipple between her thumb and forefinger, pinched it, twisted it. Pain or pleasure? She couldn't tell the difference anymore. It was such a sweet, sweet agony...

She moaned, and Luna knew she'd won.

She bent down, practically laying on top of her sister, and kissed her again. This time, she forced her tongue inside, and met no resistance—even, she thought, a hint of eagerness.

"I think you're ready," she said, drawing back, a trail of saliva connecting their lips for just a moment. With a wave of her hand, the collar on the table levitated over. It hung in the air over Celestia's head; her eyes lazily focused on it.

"What is obedience?"

"Pleasure," Celestia gasped out. The crop continued to thrust into her.

"And the punishment for disobedience?"

"P-pleasure and pain!"

"And just who does your body belong to, sister?"

"Y-you!"

"Good girl." The collar lowered. "Put it on, sister. Display your obedience to me. Display proudly the mark of your owner."

The thought of obeying gave her pleasure. The thought of not obeying hurt, and that hurt also gave her pleasure, and that pleasure made her yearn to obey.

Celestia's trembling hands reached for the collar.

The dark leather slid across her skin. She pulled it tight, restricting her throat just enough that she would feel it with every breath. She moaned with happiness as her fingers threaded it through the buckle, locking it in place. Celestia's pale skin showed through the moon-shaped hole, completing the design. It was now the spitting image of the mark that adorned Luna's flanks.

Celestia's arms fell back to the floor.

"I'm so proud of you, sister. You make such a wonderful slave."

And Celestia came again. Not as hard, this time, but enough to make her quake with euphoria.

The crop slid out of Celestia's snatch, making her groan. Luna held it in front of Celestia's mouth, her fluids dripping off of it and spattering on her face.

"Clean up after yourself, sister."

Celestia's tongue extended out, and she licked it clean. Luna gave her breasts another squeeze, and Celestia moaned again, low and needy. Luna would have killed for another hour with her, but much longer and ponies might start to worry where their princess was.

"Well, I've enjoyed playing with you, Celestia," Luna said, reaching up and brushing a few stray strands of her sister's mane out of her face. "But it's time for you to go to sleep again. Fall into a trance for me, dear sister."

Celestia's posture immediately relaxed, and her eyes fell half-closed. She laid there, not moving, awaiting Luna's new commands.

Luna tapped the buckle of Celestia's collar with a finger. The collar shifted, its form melting into something new.

When the magic had done its work, it was no longer a leather collar that surrounded Celestia's throat, but a symbolic one—a necklace, a thin chain with a silver moon hanging from its middle. It slid down, the cold metal resting against the skin of her chest.

"When I say 'teatime is over, dear sister', in addition to forgetting what has transpired here today, you will remember me giving you that necklace as a gift. Say, 'yes, sister'."

"Yes, sister."

"You love your new present. You never want to take it off. You will never take it off. Say, 'yes, sister'."

"Yes, sister. I will never take it off."

"And when you look at it, you will think of me. Say, 'yes, sister'."

"Yes, sister."

"You will not be able to notice any sign of our time together. You will not be able to feel the marecum dripping down your legs, or the smell of your own arousal. You will not notice the marks or the bruises on your body. If they ache, you will interpret them as your muscles cramping from stress. This will in turn remind you of me, and how refreshed you feel after our meetings. Say, 'yes, sister'."

"Yes, sister."

"You will not allow anyone besides me to see your body until they have healed. Say, 'yes, sister'."

"Yes, sister."

"And finally," Luna said, "Twilight Sparkle. Tomorrow, she is going to offer to come to Canterlot and help you with the preparations for the Summit. You are going to accept her offer. Do you understand? Say, 'yes, sister'."

"Yes, sister."

Luna smiled. "Good girl."

She stood up, looked down at her conquest. Celestia was a mess, covered in sweat, drool, and her own sexual fluids. The bright red marks from Luna's crop stood out against her skin.

The manacles around her ankles clicked open, the bar clattering to the stone. The bands around her wings slid off. And the key, almost completely forgotten, floated up and unlocked the inhibitor ring, which slid off and joined the other toys on the table.

The anal plug, however, remained where it was.

"Up you get, sister," Luna said, offering her a hand and pulling her up to her shaking feet. "And get dressed. You have a long day ahead of you."

Lesson 4: Displaying

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"Princess!"

Celestia smiled. She knew that voice well.

Turning in the castle courtyard, her smile only grew wider.

Her student (former student, she had to keep correcting herself—old habits died hard) came running up. She'd grown so much over the last few years. When they'd first met, Twilight had barely reached her knee. Now, she was almost as tall as she was.

They embraced.

"It's wonderful to see you, Twilight," Celestia said. They pulled apart after a moment. "Thank you for volunteering to help with the Summit. I must confess, it's been so much more overwhelming this year than I remember."

"I'm glad I can help," Twilight replied. "Anything you need, just ask."

"I appreciate it. Come; let us go inside."

They started down the green-lined path through the front gardens towards the entrance to the castle. As they walked, Twilight seemed to notice something.

"What's that, princess?"

Celestia glanced down at what Twilight was pointing to. "Oh, this?" she said, grasping the eclipse-styled pendant that had been bouncing across her bosom in her hand. "It was a gift from Luna."

"Oh. I like it," Twilight said. "Is it enchanted?"

Celestia quirked an eyebrow. "No, I don't believe so. Why?"

"I can sense magic on it," Twilight said. "Powerful magic. Don't you?"

"No..."

"You're sure Princess Luna didn't mention an enchantment?"

"No, I'm... quite sure," Celestia said. "Perhaps it's just a preservative charm? To keep it from tarnishing."

Twilight shook her head. "No, this feels like... transformation magic. Could I—"

"Twilight Sparkle!"

She jumped at the sudden utterance.

They both looked up. They'd made it to the steps up to the main entrance to the castle; standing framed between the doors was Princess Luna in a long, black dress, looking down at them with amusement.

"It is good to see you again, Twilight. It has been some time."

"Princess Luna!" Twilight smiled. "It's good to see you too. How have you been?"

"Just fine," Luna said. "Just fine. And you?"

"Oh, I've been alright. Busy, as always. Oh, but I'm excited to help!"

Luna smiled. "Oh, I'm thankful for it. Shall we get to work?"

"Teatime, dear sister."

Celestia froze. Immediately, a heat rushed into her cheeks. She felt herself begin to get aroused, just at the anticipation as memories flooded back into her conscious mind.

It terrified her.

Luna's tongue darted across her lips. "Welcome back, sister. Are you ready for today's lesson? Because I can assure you, I've been eagerly awaiting it."

"Twilight is here, in the castle," Celestia said. "She'll put a stop to this. I have faith in my student."

"Will she now?" Luna purred. "Well, we'll just have to see."

Out came Luna's bag of tricks. Out came the latex gloves, as well as some... other things. Luna slipped the gloves over her hands; as always, they felt amazing. A pity she couldn't wear them all the time; hiding them with illusion magic was easy, but any change in behavior at this point could jeopardize everything she'd worked for... not to mention, Twilight Sparkle was around now; whether or not Twilight would be able to see through any spell she wove was not something Luna wanted to find out.

That said, Twilight was confined to her tower for the moment, preparing for the Summit. Luna admired the enthusiasm the mare had for her work, and it would come in handy today.

Because today, well... today she'd be taking Celestia on a little trip.

"Strip for me, dear sister."

Off came Celestia's dress. Still no panties or bra, Luna noticed. That was interesting; she hadn't ordered Celestia to do that. She smirked. It seemed her lessons were truly being learned well and deeply.

She slipped an inhibitor ring over Celestia's horn. She shouldn't have needed to, but just to be on the safe side.

Luna draped her arms over Celestia's shoulders from behind. Her hands slid over Celestia's front, the cold, liquid slipperiness of her gloves a sharp contrast to her warm breath on her ear.

"Your body belongs to me, sister," Luna said. Her fingers danced playfully across Celestia's skin, edging ever closer but not quite reaching her breasts. "Isn't that right?"

"Y-yes." Celestia's cheeks flushed harder at the contact between them.

"Mine to do whatever I please with?"

"Yes."

Luna leaned forward and gave the edge of Celestia's ear a little nibble. Her clothed breasts pressed into Celestia's bare back, and for a moment Celestia could feel her sister's heartbeat.

"Then I think," Luna said, "It's time we showed that gorgeous body off a little, don't you think? But first, some... ornamentation."

Luna stepped back. "Stand for me, dear sister."

Celestia stood. A light breeze blew by; she shivered as it chilled her naked form, crossed her bare nipples, caressed her traitorous cunt, already damp in anticipation of whatever Luna had planned.

It did not occur to Celestia to attempt to run, or to fly. That hope had already been extinguished. No, her only hope now was for outside intervention.

Her only hope now was for Twilight.

"Now sister," Luna said, "I know you like your jewelry, so I've prepared something extra special for today."

She brought a series of items around in her magic for Celestia to see. They were various gold bangles, of varying sizes.

"Let me help you get dressed, dear sister. After all, we wouldn't want to disappoint your... subjects."

Celestia's mind whirled at that last word. She couldn't possibly mean...?

Her thoughts were interrupted as Luna clasped one of the smaller gold rings around her nipple.

"A-ah," Celestia uttered, as the metal clamped down upon such a sensitive spot. It was cold, and from it dangled a small jewel that swung listlessly.

Luna grinned, and attached the ring's pair to Celestia's other nipple. They squeezed down, forcing the tips of each teat out. She gave the hanging jewel on this one a tug for good measure; the ring stayed firmly attached.

Next came a pair of anklets, wide and golden, with floral patterns stamped into their sides.

"I had the castle's finest artisans prepare these," Luna said, as she clasped them shut over her sister's ankles. "Only the best for you, sister."

Finally came a larger band of pure gold, laid again in a floral pattern, that Luna slid up Celestia's right leg, stopping just below the edge of her cutie mark. The ice-cold touch of the metal pressing against her inner thigh made her shiver and flush at the same time.

"There we go," Luna said, standing up. She surveyed her work. "You look wonderful in your new arrangements, don't you think, dear sister?"

"Y-yes," Celestia said. They were very pretty...

"Just a little more," Luna continued, "and then we'll be ready."

Out came a pair of leather cuffs, connected by a short chain.

"Present your wrists, sister."

Celestia did so. The leather slipped over her wrists, and Luna pulled each cuff tight before buckling them in place. Celestia's wrists were bound together; she couldn't move them more than an inch apart.

"And finally," Luna said, reaching forward, and with one gloved finger, she tapped the moon on the necklace that even now hung from Celestia's neck. It morphed and changed, reverting back to the leather collar it had started out as. The symbol of Luna's domination over her sister.

To the ring on the collar, she attached a longer silver chain. She stepped back, letting the metal slip through her hands until she was about a meter away.

She gave the chain a yank. With a cry, Celestia was forced to take a staggering step forward. Luna grinned.

"All right, sister," she said. "Now we're ready to begin today's lesson."

With another, more gentle pull of the chain, Luna beckoned Celestia towards her, until they were just a foot apart. Luna reached forward, traced a latex-clad finger around the ring on Celestia's right nipple, just barely touching the surface of her erect teat, but it was enough to put further color into Celestia's cheeks... and further heat into her nethers.

"You belong to me," Luna said again, "isn't that right, sister?"

"Y-yes... nng..."

"Then you are my property," Luna observed.

"Yes."

"Mine to do with as I please."

"Yes."

Luna reached down with her gloved hand, ran a finger slowly up her sister's moist slit. She shivered.

"Anything I want?"

"Yes, sist—ah!" Celestia let out a little squeak as Luna's finger reached her clit.

"Then that includes," Luna said with a smile, "displaying you, correct?"

"Dis-dis-displaying?" Celestia stuttered, as Luna pressed her finger against her most sensitive of places.

Luna chuckled. "Yes... displayed. What is obedience, sister?" She quickly rand her finger in a circle around Celestia's clit.

"P-pleasure... ooh..."

"Then what is to show off that obedience?" Luna asked her. "To display your obedience? Well..."

She flicked her finger upwards.

"That too, is pleasure, isn't it, dear sister?"

"Ah! To be displayed is... pleasure?"

Luna smiled. "That's right, dear sister. To be displayed is pleasure."

She stepped back, a trail of marecum following her finger. She raised it to her mouth, licked it off.

"Come, sister... let's show your subjects who you really are."

And with that, she took the chain in hand once more, leaving a decent length between her and Celestia's collar, and turned towards the door.

"W-wait," Celestia gasped. "You can't possibly—"

"Oh, but I can, sister. And I will."

Luna reached forwards, grabbed the doorknob, and pulled the doors open with a flourish.

"After all," she said, "You can't be late for morning court, can you?"

Luna intended to bring her before the court? In this state? Celestia's nethers grew warmer, unbidden, but in her mind she was panicking.

But... wait. Wasn't that a good thing? It meant everyone could see her—see what Luna was doing to her. Yes, that was it! Her salvation!

"Guards! Guards! Help!" Celestia shouted, with all of her breath. "Help! Quickly!"

They waited a moment.

No help came.

Luna smiled. "You're going to have to try harder than that, Celestia. Now, come."

She pulled on the chain, and began to walk, Celestia stumbling at first behind her, then catching her footing,. They passed through the doorway... and past the pair of guards situated on either side of them.

"G-guards?" Celestia said, looking at their faces. Neither seemed to pay her any mind, even as she was dragged away by Luna.

On they went, through corridors and passageways, past guards and servants. Celestia's eyes darted to each of them in turn, hoping for nothing less than for one of them to see what was happening, to scream, to at least look embarrassed. But no, their eyes glanced over her, as if she wasn't even there.

Which to them, she wasn't. Little did Celestia know that Luna had already cast a spell over her; a simple notice-me-not cantrip that prevented anyone else (aside from perhaps Twilight Sparkle) from paying any notice to her, or her predicament, or Luna talking to her. Luna let out a little chuckle at her sister's desperation.

"You've done something to them," Celestia accused her.

"I've done no such thing."

"Then you've done something to me," Celestia said. "An invisibility spell?"

Luna laughed. "Oh, you aren't invisible, sister. They can see you just fine." Technically true; the notice-me-not didn't affect their sight, just their perception. A devilish smile played across her face. "You can feel their eyes on you, can't you, dear sister?"

Celestia's eyes widened, because all of a sudden she could feel their stares. That prickle at the back of her neck—had that been there a moment ago? And suddenly her entire body felt warmer. Heat blossomed in her cheeks.

But...

Why was part of her happy to be looked at, in this state?

It must have been because it meant someone might be able to help her, Celestia rationalized. Yes. That must be it. She shook her head.

And meanwhile, her cunt dripped onto the marble floor below.

And all the while, Luna smiled.

After what felt like an age to Celestia (and far too soon to Luna), they arrived at the entrance to the throne room. Gaurds stood to either side.

"My sister has asked me to fulfill her duties in court for the day while she works on the preparations for the Solstice Summit," Luna said.

"Very good, ma'am."

They opened the doors for her, and she entered, Celestia trailing behind on her metallic leash. Luna lead her up the steps to the throne, which she sat upon, Celestia's chain never leaving her hand.

"Lay at the base of my throne like a good pet, dear sister. Hands and knees."

Celestia did as she was told, kneeling on the hard marble, head down.

Smirking, Luna stretched out her legs and laid them on Celestia's back. The heels of her sandals bit into the space between Celestia's wings, and Celestia let out a little grunt.

"Ahh," Luna said. "It feels good to put your feet up, doesn't it, sister?"

No response. Luna frowned. She ground her heels harder into her sister's back.

"Ah! Y-yes, sister!"

Luna smiled again. "Much better."

She turned to the guards by the door.

"Send in the petitioners," she commanded.

The doors opened, and Celestia could see the line of ponies outside the door. The first group, a pair of stallions, was ushered forwards. Celestia looked at the first of them, hopeful.

His eyes passed over her, as if she were a piece of meat. As if her being there, trembling, naked, was the most normal thing in the world.

And yet still, she could feel their stares, even if she couldn't see them, and heat rose in her cheeks... and in her nethers, as well. Why? Surely she wasn't... enjoying this?

To be displayed is to show your obedience, a voice whispered in the back of her mind. Obedience is pleasure.

And for the first time since leaving the balcony, Celestia became aware of the state of her nethers.

She was drenched.

An hour of court passed, and Celestia felt like she was going to collapse. Her arms were beyond tired, and the only thing keeping her there was the command Luna had given her.

Which was why it was such a relief when Luna finally lifted her legs off her back.

"I release you from your position, dear sister."

Celestia slumped to the cold marble floor, her arms giving out and her knees hurting. And yet, the hurt felt...

Luna sighed. "I'm getting bored, Celestia," she said, in a petulant tone. "Honestly, I don't know how you keep this up. I love our subjects too, of course, but it can be so exhausting listening to their trivial problems for hours on end."

She grinned. "Perhaps some entertainment is in order."

Celestia didn't like the sound of that... or did she? She wasn't quite sure.

"Sit up," Luna said, pulling on Celestia's chain. Celestia did so, her arms falling to her sides. The cuffs around her wrists were undone by Luna's magic.

"Why don't..." Luna said slowly, tapping her chin, as if she didn't already know exactly what she had planned. "Ah, I know; why don't you pleasure yourself for all these ponies, dear sister? Give us a show."

"Y-yes... sister," Celestia said. She had no choice.

Sitting now on the top step of the stairs to the throne, she spread her legs. One tired hand went down, between her legs. Without the will or the energy to resist, Celestia could only watch helplessly as a finger slid down between the folds of her dripping cunt.

"Next petitioner," Luna called out, and without looking, Celestia could already feel their eyes on her... on the slit which she now began to rub, slowly at first, then with more vigor.

She let out a moan as her finger passed her clit, but... as she worked her own cunt (as she had so many times before), she couldn't help but feel...

Help but feel that...

Gods, it was so...unfulfilling.

It felt good, sure, as her fingers pistoned and caressed her marehood, and she let out another little squeak, but something was just... wrong. She wasn't... okay, she was aroused, her vagina was sopping wet and the fluids within clung to her fingers like glue, but... There was no rush.

She wasn't getting any closer to an orgasm, either.

Confused, she glanced back at her sister, and immediately her breath caught in her throat.

Only for her, that infernally tempting voice whispered in the back of her mind. Your orgasms are only for Luna.

Her head went fuzzy. Images of her sister, both in real life and in her dreams as of late, flooded in. No, she couldn't—her own sister! But... it was too late.

She began to move more vigorously, panting now. A second finger slid into her glistening slit.

Yes, that's it, Celestia Luna thought, watching her sister. Look at me. Think only of me. Only I can satisfy you. Only me.

Celestia let out her first moan. One hand crept up, wrapped around her breast. She began to knead it, pushing on it in rhythm with her fingers working down below. Her juices dripped out of her, pooling and smearing on the marble floor.

She could feel the eyes of the petitioners on her, and it felt good and terrifying at the same time.

And the petitioners?

They didn't care.

They didn't care at all.

Luna watched on, amused, as her sister's expression warped between total horror and absolute bliss.

And then, bliss won.

Her head slowly arched back towards the ceiling as she came, letting out a long, slow moan of pleasure as more and more marecum spurted out of her with each thrust of her fingers.

And all the while, Luna held her leash.

Celestia collapsed to the cold marble, a heaving, dripping, sweating, drooling mess.

"Oh, poor thing, tired already?" Luna said. "Well, you'd best recover quickly. After all..."

She smiled, devilishly.

"There's still another four hours of court left to go!"

Lesson 5: Domination

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She wasn't sure what made her ask the question. She just knew that she had to, and that it was important that she did so. It was vital... for some reason.

She brushed that feeling aside.

"Would you like to join us for tea, this morning?" Celestia asked.

"Oh," Twilight said. "I'd love to!"

Luna took a sip of her tea. It was Earl Grey today. Not her favorite, but she'd been in the mood for it... or so she'd thought. Oh well.

Using her magic, she put her cup back on its saucer, and then put the saucer back on her table... which, at the moment, was Celestia, trembling on her hands and knees at Luna's feet.

"Careful, sister," Luna said. "You wouldn't want to spill my tea, would you? I imagine that would be rather unpleasant for you."

Celestia bit the inside of her cheek and tried not to move. She was currently collared, naked, and bound, a spreader bar locking her back legs into place and her wings tied with elastic. The familliar plugs had been inserted into her ass and cunt, the one in her cunt pulsing with vibration every few seconds. She could feel an orgasm building, but agonizingly slowly.

Both plugs carried the cutie mark of their owner.

But none of that mattered. She'd managed, through some miraculous burst of willpower, to ask Twilight to tea with them. When she arrived, all of this would be over. The nightmare would finally end.

She just had to hold out until then.

"You're oddly quiet," Luna remarked. "What, no begging today? No resistance left in you? Well, I know that last part isn't true, or at least I hope not. That would make today's events very boring indeed."

The doors burst open.

"Sorry I'm late," Twilight said, stepping through, letting the doors swing shut behind her. "I was busy looking after—"

She looked up... and froze.

"Princess Celestia, what—"

"Twilight!" Celestia shouted. "It's Luna, she's become the Nightmare again, you have to stop her! Quickly!"

"Princess Luna is—"

"Didn't I tell you," Luna said, sitting most unconcernedly in her chair and sipping at her teacup. "That I'm not Nightmare Moon?"

Twilight looked confusedly between the two of them.

"I don't—"

"It's okay, Twilight," Luna said, smirking. "You can drop the act."

"W-what?"

"I allow you to be your true self in front of Celestia."

And all at once, Twilight's demeanor changed. The shock and concern in her face melted away, replaced by a blank smile that sent shivers down Celestia's spine.

"Yes..." she said.

"... my mistress."

Celestia's eyes were wide. What—mistress? What was happening?

"I assume you're rather confused, Celestia," Luna guessed correctly. "Perhaps this will illuminate things for you. Twilight, take off your dress."

"Yes mistress."

Celestia watched in horror as Twilight removed her clothes, revealing...

Revealing...

Thin, purple-colored ropes criss-crossed across her torso, bound with little knots. Two of the ropes wound round her breasts, forcing them up a little. Another two dug into her crotch.

Her soaked, dripping crotch.

Twilight blushed.

"No need to be embarrassed, Twilight," Luna said. "Not around us."

"T-Twilight," Celestia stammered. "I-I don't understand... why..."

"You still don't get it sister? I'm surprised." Luna said. "Twilight, who is your mistress?"

"You are, mistress."

"And why am I your mistress?"

"Because you showed me my true self, mistress. You taught me the pleasure of obedience."

Luna turned to Celestia, smugness in her face.

"You see," she explained, "Twilight was my... my little guinea pig, shall we say. After all, I had to make sure I got all this right when I tried it on you, sister. So, a few months ago, I began visiting Twilight in her dreams... planting the seeds of suggestion and obedience into her mind, just as I have with you."

"Of course," she continued, "My methods weren't perfected yet, and she resisted at first, but... well, you can see the results for yourself."

Tears welled up in Celestia's eyes. To see her student, her lovely, wonderful student, in such a state was more than she could bear.

"Twilight..."

"Oh, don't worry about her," Luna said. "She's happier this way. Aren't you, Twilight?"

"Yes, mistress. I'm much happier now that I'm your slave."

Luna smiled. "See? Well, you'll understand soon. After all..."

She looked Celestia in the eyes.

"You'll be just like her soon."

She took a step back. "Today is the final lesson, Celestia. Are you ready? Because I am. I've been waiting for this day for over a millennia."

"Luna, please," Celestia begged. "You can do whatever you want from me, but let Twilight go. She has nothing to do with this!"

"Sacrificing yourself for your student's freedom?" Luna said. "How very like you, Celestia. But I'm not in the mood to make deals, not when I've already won."

"Please, Luna! You can't be this cruel!"

"Cruel?" Luna scoffed. "Cruel, she says. After imprisoning your own sister on the moon for a thousand years, I'm the cruel one? Don't I deserve some recompense for that Celestia? Am I not entitled to something?"

"Besides," she said, "you heard her. She's happier now than she's ever been... under you. In fact, that gives me an idea."

She turned to Twilight. "Twilight Sparkle. Why don't you help your... former... teacher see just how much happier she'd be if she'd just stop resisting and give herself over to me? Like I showed you."

Twilight looked at Celestia. She licked her lips.

"With pleasure, mistress."

"Did you know, Twilight here had quite a thing for you," Luna said, idly. "I got to experience it first-hoof in her dreams. She was utterly infatuated... not that I think she'd have ever actually shown it, mind you."

She grinned.

"You must be rather excited about this, aren't you Twilight?"

"Very, mistress," Twilight said, stepping forward. "Thank you."

"You're very welcome, my slave. Allow me to get things ready for you. Stand, dear sister."

Celestia got to her feet, slowly, clumsily with the spreader bar still in place.

The vibrator was removed slowly, Celestia's juices trailing after it. Celestia let out a moan as the soft material rubbed against her clit.

"Hands behind your back."

Celestia did as she was told.

Luna bound her hands behind her back with a strap of cloth, then stretched that down and tied the end to the spreader bar that even now held Celestia's legs open. The length was just a little too short, forcing Celestia's chest—and her crotch—out, just slightly.

"There you go," Luna said. "My present to you, my slave. Do as you see fit."

And with that, she sat back to watch the show.

Twilight circled around Celestia's naked body, taking in her figure. She reached out with a finger traced her way from one sun-laden hip, across her ass, to the other, finally ending by brushing against Celestia's marehood. Celestia let out an involuntary squeak. Bound as she was, the shot of pleasure seemed all the more powerful.

Twilight giggled.

"Twilight, please," Celestia begged. "You mustn't let her control you! You have to fight it, Twilight?"

"Why would I want to do that?" Twilight replied.

"Because... because..."

The words had to be there, Celestia thought, but they wouldn't come out.

Why should she resist?

After all...

Obedience is pleasure, whispered that voice in the back of her mind, unbidden.

Twilight circled around her once more, stopping behind her. Her hands wrapped softly around her waist.

"Twilight—" Celestia started to say. She was cut off, however, as Twilight's hands slid across her skin, one upwards, one downwards.

"Shh," Twilight said, as her hands moved. "Just enjoy it."

One hand, the right hand, curled around Celestia's breast, groping her. The other continued down, down, until...

"A-ah..."

Twilight's fingers brushed softly against the entrance to Celestia's cunt.

"Wow, princess," Twilight said, that same smile still on her face. "You're so wet already..."

And with that, she began. Her right hand began to knead Celestia's breast, pressing into her skin and sending shivers down her spine.

And her left...

"Ah!"

Twilight's fingers spread the folds of Celestia's dripping marehood apart. A finger slipped inside, began to stroke in Celestia's most sensitive of places, in time with the jolts of pleasure coming from her breasts.

Celestia let out a moan as Twilight's fingers pressed against a specific spot. Twilight giggled.

Celestia panted as Twilight continued her ministrations. Ropes of her juices stretched and fell as Twilight's fingers pistoned in and out of her, her palm brushing every so often against her clit and sending jolts of pleasure racing through her body. When had her most loyal student learned to take care of a mare like this? The thought went as soon as it came, replaced by a dull blanket of pleasure that began to bury her thoughts.

"Ah... A-ah..." Celestia moaned. She could feel the orgasm building, like a rush of water hitting a dam. Building... building...

And then it stopped. Right on the cusp of flowing over, it stopped, leaving her hanging on the precipice.

As if she had read her mind, Luna spoke up. "Remember, sister," she said, "your orgasms are reserved for me, and me alone."

Twilight continued, unhindered, and Celestia ached for release. They continued like that for some time, until both of them were panting, drooling messes. To Celestia, it felt like an age had passed.

Twilight's hands withdrew. The sudden lapse in pleasure made Celestia droop, exhausted already. The break wouldn't last long.

Twilight circled back around to Celestia's front side. She was licking her juices off of her fingers, one at a time.

"Princess," she said. "I always thought you were beautiful."

Fingers cleaned off, she knelt in front of Celestia's dripping crotch. Her arms wrapped around to Celestia's back.

"I always wanted to do this with you."

"Twilight, don't..."

Twilight's tongue pushed its way between her folds, and she yelped. The waters that had receded when Twilight had released her now began to build again, twice as powerfully as before. And still, even as Twilight's tongue danced around inside her, kissed her clit and rubbed each and every place that Celestia held sacred, she could not make it over that edge. Twilight held her there, and time seemed to stretch into infinity as her thoughts once again clouded.

Drool dripped from her mouth. Juices dripped from her cunt, Twilight lapping them up like water. She couldn't take this. She just couldn't.

After another age in that state of agonizing almost-bliss, Luna spoke. Celestia could barely hang on to her words.

"Twilight, my dear, you're being very predictable. I have another idea. Why don't you use this?"

Celestia couldn't see whatever it was she was offering, but Twilight stopped. She was panting, too, and her own slit was dripping onto the balcony.

"Of course, mistress," she said, hurridly, and stood up, passing out of Celestia's view. Celestia tried to turn her head to see, but she didn't have the strength. She merely hung, her eyes drawing closed. Tears she hadn't realized she;d been crying ran down her face.

When Twilight returned, she was wearing...

It was an obscene thing; a horsecock, made of some kind of rubber, like the one that had occupied her earlier. Unlike that one, however, this had further attachments: a set of straps, designed to hold the thing to a mare's waist.

Which they were, to Twilight's.

The strap around Celestia's wrists fell away. She felt a sandaled foot dig into her back, and she was pushed forward. She only barely managed to catch herself.

"Go ahead, my slave," Luna said to Twilight. "Fuck her."

"With pleasure, mistress."

Celestia didn't have the strength left to protest as the thing attached to Twilight pushed its way into her. Slowly, at first, then Twilight thrust her hips forward and the entire thing slid in, forcing a yelp form Celestia's mouth. It was just barely too big; she felt like she was going to burst.

And then Twilight's hips began to move. Back and forth, again, slowly at first, but picking up speed. The horsecock thrust in and out of her gaping pussy, and each thrust hit her harder than the last.

And still.

Still.

Still she was held on the edge of that cliff, unable to push over the edge.

It was breaking her. She could feel it breaking her, the pleasure overwhelming her mind, her ability to think.

A pair of sandaled feet crossed in front of Celestia's face. Luna's.

Luna knelt down, cupped Celestia's chin in a latex-clad hand forced her head up so they were looking at each other.

"P-please," Celestia begged. "Let me cum..." It was all she could think of to say.

Luna laughed. "No," she said. "Not yet. There's a lesson to be taught first. The final lesson."

She smiled.

"Obedience is?"

"P-pleasure," Celestia stammered out between thrusts of Twilight's strap-on. "Pleasure. Obedience is pleasure!"

"Good," Luna purred. "Do you know why obedience is pleasure, Celestia?"

"N-no..."

"It's because you love it."

Twilight thrust forward, harder than before, and Celestia's vision went unfocused. When it came back, Luna was smiling down at her.

"And you do love being my little slave, don't you... dear sister?"

And that was it. The last little nudge to send Celestia over the edge.

Just like that, Celestia finally...

Broke.

All conscious thought—gone.

Just.

Like.

That.

A weak smile overtook Celestia's features.

"Yes..." she said, slowly. "I do... love... being your slave... sister..."

Luna cackled.

"Yes!" she shouted. "Yes, you do, don't you, my little fuckslave?"

"Yes... sister..."

"I win!" she said, standing. "I finally win! You're mine, Celestia! Forever!"

"Yes..." Celestia said. "Thank you for teaching me... sister... I feel much... better now."

"Ahaha!" Luna cried, then composed herself, her grin turning into a sly smile.

"Now, Celestia, there's just one more thing you must do for me," she said. "As your mistress, I command it."

"Yes... mistress..."

"You remember the Celestia you used to be? The one who is sleeping, now, who has no memory of this?"

"...Yes..."

"Good," Luna purred again. "Forget her. Forget her, dear sister. You won't need her anymore."

"Yes..." Celestia breathed, "mistress."

And she felt that place, in her mind, where that Celestia slept, during teatime.

And she began to forget. With each thrust of Twilight's cock, that Celestia seemed to get further and further away, until...

Just like that...

She was gone, and all that remained was her. The broken Celestia. Her sister—her mistress's—slave.

"And now, my slaves," Luna said, "you may cum."

And they did.

Teatime

by RunningThroughTheAshes

Lesson 1: Obedience

Lesson 2: Restraint

Lesson 3: Discipline

Lesson 4: Displaying

Lesson 5: Domination

Epilogue