The Lunar Cotillion

“I think this may be… unwise.”

Celestia felt a familiar shudder down her spine as her sister’s low, almost sinister laugh floated throughout the dressing room. It was a special laugh, not the awkward, good-natured chuckle that Luna would give during meetings with nobles or foreign dignitaries. Indeed, this wasn’t even the laugh Luna shared among her close friends, not with Twilight Sparkle or the various youngsters she guided and befriended. No, this laugh was a laugh only Celestia got to hear. It had a velvety quality to it, dripping with a sort of confidence that one wouldn’t often attribute with the Princess of the Night. In public, Luna had always been seen as rather quiet and reserved when compared to Celestia, lacking the natural enthusiasm and energy that her elder sister has in spades.

Behind closed doors, things were very, very different for the sisters.

“I hardly believe that to be your decision,” said Luna with a smirk. “Remind me, sister dearest.” Celestia felt another shiver on those two small, innocuous, innocent words. Luna had that power, somehow capable of undoing Celestia’s foundation with a few choice words. “What is today?” Celestia gulped, turning back to face her sister. A cerulean aura gripped her chin, turning her away. “I didn’t say you could turn. Answer the question.”

“T-tonight is the Lunar Cotillion, sister,” said Celestia. She could hear Luna stand up from her seat, her slow, even hoofsteps echoing throughout the dressing room. The room was quiet enough to hear a pin drop, and Celestia could feel Luna approach as much as she heard her.

“Very good. The first ever Lunar Cotillion, if you’ll recall. A celebration in honor of who, exactly?” Celestia heard Luna begin to pace behind her, no doubt looking her over. Celestia was usually very confident in her appearance, knowing that all eyes were on her whenever she strolled into a room. But, with Luna’s eyes slowly panning over her, crawling over Celestia’s form, the Solar Princess felt a strange sense of doubt. Some part of her was sure that she looked great, wearing a long, beautiful navy blue dress, the gown stopping just before her hooves to show off the elegant silver shoes that she had specially made just for this occasion. Even still, her heart stopped as Luna looked her over, inspecting her.

“To honor you, my lovely sister.”

“Precisely. And honoring your sister means…?”

“Following your every order,” said Celestia. Again, she attempted to turn to face her sister, and again, Luna straightened her neck with a firm magical grip.

“Raise your dress. Show me that which belongs to me.” Celestia felt her face flush red, her heart pounding like a drum in her chest. She gripped the hem of her dress in her sunny yellow glow and slowly, carefully raised it. She bared her legs, then her thick, juicy flank in her lacy black panties, finally settling her dress just before her dock. “Head down. Spread your legs.”

Celestia hesitated, but obeyed nevertheless. She stooped down until her chin was nearly to the floor, then took a step or two apart to spread her hind legs as Luna instructed. She felt so vulnerable, like prey to a predator, and she loved every second. Her legs trembled slightly as she stood, her excited pussy soaking her panties and dripping down her thighs. She let out a small yelp of surprise when she felt her sister’s hoof against her slit, rubbing her lower lips gently through the cloth.

“Good girl. You remembered your panties, you know the ones I like,” purred Luna. Celestia felt her ears burn as her sister caressed her, her words crawling up and down Celestia’s back. “However… You seem so… So empty. Shall we fix that before the party?”

“F-fix…?” Celestia gulped, swishing her tail nervously over her marebits. She let out a yelp as Luna firmly grabbed her flanks, rubbing circles around the sensitive skin that bore her Cutie Mark. “What do you mean, sister dearest?”

“I thought you’d never ask.”

Celestia could hear the sound of twinkling magic, but didn’t dare raise her head to see what manner of spell Luna was casting. All she could do was watch as a wooden chest, about the size of a shoebox and decorated with the royal insignia of Castle Canterlot, appeared before her very eyes in a puff of cerulean smoke. The lock on the chest melted away under the might of Luna’s magic, opening up to reveal its contents.

First from the chest rose a toy that the Solar Princess was very familiar with. It was a stainless steel buttplug, the widest one that they had. Inset in the handle of the toy was a circle of stained glass, in which the crescent moon of Luna’s Cutie Mark was immaculately recreated. After the buttplug came a bottle of lube, and a blue bullet vibrator.

“Which one first?” asked Luna. Celestia tensed slightly, unprepared for such a question. She wasn’t expecting either of the toys, certainly not both at the same time. Still, she couldn’t imagine disobeying her sister, and so she gave an answer after a short second of consideration.

“Vibrator, please,” murmured Celestia. A moan escaped her as Luna yanked her tail up and pulled her panties down to her knees, unveiling Celestia’s winking, desperate pussy. Luna chuckled at how horny her sister was before bringing the vibrator to Celestia’s pussy, carefully sliding it into her tight hole and earning another moan from the princess. Luna conjured some tape with her magic, securing the vibrator in place. Celestia took a deep breath, relaxing her body for what was next to come.

“So eager… I must have kept you waiting too long,” purred Luna.

“Yes…” Celestia bit her lip as soon as the words left her mouth. She didn’t mean to say that out loud, but it was true. The two had been so busy lately that they hadn’t had time to unwind together. Worst of all, Luna had explicitly forbidden Celestia from cumming without her permission, and their last session was weeks ago. Celestia was so hungry for this, an opportunity to serve her sister, her mistress, and give her all that she desired, that she couldn’t keep her tail still. It swished restlessly, occasionally covering her rear out of some reflex. “So long…”

“Well, let’s not keep you waiting any longer.”

Luna firmly pulled Celestia’s tail straight up, licking her lips at what was waiting for her. Not only was her pussy stuffed, winking and spasming as if to swallow the toy, but Luna could also see Celestia’s tight, pink, puckering asshole. Celestia could definitely take the plug, with relative ease, but she always made some of Luna’s favorite squeaks and moans when they were engaging in buttplay.

Celestia let out a shudder as a glob of cold, thick, viscous lube dripped between her cheeks, stifling a moan as Luna worked it in to make sure there would be a smooth, gentle insertion. When Luna was done lubing up Celestia, she did much the same with the buttplug itself, then slowly pressed it into Celestia’s tightest hole.

Celestia moaned into her hoof as Luna slowly, gradually forced the toy in, spreading and stretching her. She could feel Luna standing over her, her power and control almost radiating down onto Celestia. Slowly, the buttplug pushed into Celestia, who tried to stay as relaxed as possible.

“Good girl, very good girl,” whispered Luna. “Take it all, dearest sister. I know you can do it…” Luna grinned as she finally forced the entire plug into her sister, watching her back half shudder and twitch with excitement. “There. How was that?”

“Good, sister. V-very good,” said Celestia. She let out a yelp as Luna firmly spanked her ass, watching it jiggle for a bit before replacing her panties and dress, using her magic to teleport away the lube and toybox.

“Perfect. You are not going to touch those for the rest of the night, understood?” asked Luna. Celestia gave a gentle, timid nod. “Good. Now be a good slut and go start my celebration.” Luna’s tone didn’t waver, and it became immediately clear to Celestia that Luna was not asking. This was a command. “And if you do well… Mayhaps I have a reward for you…”

“Thank you, sister. I’ll be sure to make you happy.”

Celestia cleared her throat, straightening her mane and crown in an attempt to make herself presentable. She smirked to herself, then subtly started swaying her hips as she did. When she heard Luna’s chuckle, confirming that she had her sister’s attention, she strode forward and pushed through the dressing room’s door, stepping into the ballroom proper.

She was on the second floor of the castle’s ballroom, able to look down on her subjects from the balcony. There was a veritable sea of ponies, all gathered for the same reason. Some were seated at tables, others at the bar, and they were all chatting and mingling among themselves. Celestia took in a deep breath, trying to calm herself from Luna’s earlier teasing. This wouldn’t be the first time Luna had gotten Celestia all worked up before a speech to watch her squirm, and it surely would not be the last. Celestia smiled at her sister’s antics before clearing her throat and gathering the attention of the castle’s guests.

“Ladies and gentlemen, welcome!” Celestia’s voice was gentle, but carried with it a floating, expanding, encapsulating power. Every time she spoke publicly like this, Celestia tried to sound like how her sister during their time together, dripping with confidence and power. “Welcome to the first ever Lunar Cotillion!” The crowd applauded politely, cheering for their princess. “Tonight, we are here to celebrate the return to the throne of one of Equestria’s greatest warriors, defenders, and leaders. A mare that I am incredibly grateful and fortunate to call my sister. So, without further ado… The Princess of the Night, Princess Luna!”

Bzzzz!

Celestia yelped as the toy in her cunt suddenly buzzed to life, her moan thankfully covered by the blanket of cheers and applause from the partygoers. A lightning bolt of pleasure arced throughout her body, her hind legs tensing close out of reflex. Celestia had to bite her lip to stifle a further moan; she was so taken off guard by the sudden activation of the vibrator in her pussy that she almost came right then and there. Luckily, she held off, adjusting to the sensation with a few deep, calming breaths just as her sister emerged from the dressing room and took her spot beside her. The crowd, having not noticed anything out of the ordinary, simply cheered the arrival of their diarch, the reason for the celebration. Luna spared Celestia a simple, knowing smirk before turning to address her subjects.

“Greetings, friends. I am sure you are all eager to drink and dance and otherwise make merry, so I will keep things succinct,” said Luna. Celestia felt her legs tremble as she watched her sister speak, the cool, mysterious aura that the Princess of the Night carried with her being one of the things Celestia found most attractive about her sister.

“One thousand years ago, I found myself bitter. Lonely. Angry. And in my anger, I am sad to admit that I lost my way. I became a monster, a being that should be ashamed to call itself a pony at all, nevermind one of Equestria’s princesses. Only one could set me along the path to redemption, and it was the one whom I hurt the most.” Luna glanced back at her sister, stopping Celestia’s heart in her chest. The two had known each other for so long that they often didn’t need words or even actions to convey the love they shared for one another, and this was one such time where speech was unnecessary. “Of course, I would be remiss if I did not acknowledge the efforts of the Spirits of Harmony, whom I am very proud to say have become greater defenders of Equestria than I could ever hope to be. But… My return to my home, to my family, it would have been impossible without my sister making what was undoubtedly the most difficult decision of her life.

“And that is what I learned from my banishment, and my return. I learned that even the strongest of adversities can be overcome with the strongest of wills. Determination, and the integrity to do what is right even when it feels impossible… More so than the centuries of magic, that was the most important lesson I ever learned from my sister. I hope to encapsulate that trait, to become a stronger mare today than I was all those years ago. So I would like to thank Twilight Sparkle and her friends, every pony who gave me a second chance upon my return, and, most of all, my dear sister. Without you, I would not be the mare you see before you today.” Luna stomped her hoof, sending an echo throughout the ballroom. “But enough sentimentality! You came here to celebrate, and celebrate you will! Let the first ever Lunar Cotillion begin!”

Everypony present clapped enthusiastically for Luna’s speech, soon after dispersing to mingle and dance. Celestia watched Luna for a bit, biting on her lip as she stared at her sister. She internally cursed the nature of such a high-class party, the kind necessitating formal dress, for blocking her view of her sister in all of her glory. Celestia could do little more than watch Luna’s tail swish, imagining her tongue in her younger sister’s twat, tasting her sweet juices as she lapped at Luna’s cunt, doing everything in her power to please her.

“Thank you,” said Luna. Celestia tore herself away from her own fantasy, slowly approaching Luna and wrapping her wing around her. Luna returned the hug, leaning her head gently against Celestia’s neck. “Not just for this. For everything.”

“It was my honor, dear sister,” said Celestia. “You deserve this. If I had only done this all those years ago…”

“Hush. You did all you could to save me. Sometimes, you can’t stop those you love from falling. All you can do is help them back up.” Luna turned and pecked Celestia on the cheek, breaking away and looking back down to the party. “I suppose we should go and mingle with our guests, hm?”

“I believe they would enjoy that immensely,” agreed Celestia.

“Very well. Go on, speak with your subjects. I’ll catch up.” Celestia nodded, taking a step to depart before Luna gripped her ear with her magic. Celestia felt that familiar shudder up her spine as Luna neared her, her breath against her ear as she whispered. “Be a good girl and keep your dress in place. We wouldn’t want your subjects knowing what a slut you are, with how wet your panties are at your sister's celebration, would we?”

“Y-yes, sister. I’ll be good,” Celestia moaned breathily. “I’ll be a good girl for you…”

“I know you will.” Luna gave the scene a quick scan and, when she confirmed that nopony was watching, gave Celestia’s flank another firm spank. “Now go. I will be down shortly.”

“Yes, ma'am.”

Celestia took in another deep breath, regaining her composure before striding down the steps and onto the main ballroom floor. As she expected, she was flocked almost immediately by guests. She smiled at these ponies, laughing internally. Here they were, asking her innocent things like what brought on this party and if she has plans to make this celebration of Luna a regular event. Little did they know, Celestia was doing more than just celebrating Luna; she was submitting to her, letting her younger sister use her for her own pleasure. She smiled and answered the incoming questions, responding charmingly despite the soaked panties, plug in her ass and the still-buzzing vibrator in her pussy. Celestia quite enjoyed having that little secret, and she was certain Luna felt the same.

“Princess! Princess Celestia!”

Celestia's smile strengthened upon hearing that voice. She quietly excused herself from the crowd of chattering nobility, turning to cross the ballroom and meet up with her faithful student. Twilight was waving at her from the bar, champagne in hoof, which made Celestia chuckle. It may have taken her years, but it seemed Twilight was finally starting to loosen up.

“Twilight! I'm so glad you could make it!” said Celestia, giving her former student and fellow princess a hug. “I know that parties were never your favorite thing in the world, especially ones like this.” She lowered her voice to a whisper, giving Twilight a sly wink. “Honestly, with some of the snobs that show up here, I have trouble convincing myself to go.”

“Oh, it can’t be that bad,” giggled Twilight. “Besides, I think I speak for both of us when I say we’re not really here to party with Canterlot nobility.”

“Of course. This is Luna’s night. If I want to be bored by gossip of who’s cheating on who in the city, I’d read the tabloids. At least their nonsense is entertainingly written.” The two alicorns shared a laugh, during which Celestia grabbed a glass of champagne from a passing server. “So, are you here alone?”

“No, no, the girls are all here. Applejack and Fluttershy probably have their hooves full dealing with Pinkie and Rainbow at the punch bowl, and I think Rarity is trying to hit on a duke.” Twilight shook her head with a smile, a smile which Celestia returned, although with an added layer of mischief.

“That’s wonderful, dear, but that’s not what I meant. I meant, are you here alone?” Celestia bounced her eyebrows at Twilight teasingly, smirking as her student began to bloom red. “Oh, that blush tells me no. Who’s the lucky stallion?”

“Mare, actually. I may have gone through the mirror to ask Sunset Shimmer to accompany me to this ball.” Twilight flushed even brighter red, taking a big sip of her drink to avoid looking Celestia directly in the eyes. “She’s around someplace. Getting to know people.”

“Ah, my two brightest students, how fitting that you two would come together,” said Celestia, sipping her champagne. “Although, I do find myself curious… How did that come to be?”

BZZZZZ!

Celestia choked into her drink as her toy buzzed even harder, shaking her body with shivering, quaking vibrating. She just barely choked down a moan, her eyes darting around the ballroom. Sure enough, on the other end of the room was Luna, conversing with a group of ponies. The glow of her horn was just fading as Celestia saw her, the Lunar Princess’ discreet adjustment of the vibrator going unnoticed by all but Celestia herself. Luna grinned deviously, giving her sister a sly wink, before turning back to her conversation, as if she hadn’t left it to begin with.

“Princess, are you okay?” asked Twilight, her concern evident. Celestia cleared her throat, trying to keep herself from fidgeting too much.

“Y-yes, of course. My a-apologies, just had a bit of a tickle in my throat.” Celestia’s lip quivered as she spoke, and she could only hope that Twilight hadn’t noticed. “Now, go on. You and Sunset, I would very much like to hear that story.”

BZZZZZ!

Once again, Celestia’s vibrator increased in intensity, earning and unwilling, surprised moan from the princess. She covered her mouth with her hoof, hoping to pass it off as a yawn, and seemed to be successful. Twilight hadn’t noticed, most of her attention seemingly devoted to how best to tell her story.

“Well, I’ve been popping back and forth between here and the Mirror World to keep an eye on things, and one time when I was over there…”

Celestia tried her hardest to listen to Twilight, she really did. And, at first, she was succeeding. She clenched her jaw and ground her teeth as she listened to Twilight explain how she had a particularly long day and decided to stay with Sunset for the night rather than return to Equestria. Celestia cared about Twilight and Sunset quite a lot, and she was very happy for them, wanting to be a part of their lives by learning their story.

But it was impossible to ignore the buzzing vibrator for long. With every second that passed, the electric pleasure became harder and harder to control. Celestia took in a deep, almost labored breath, her legs twitching as she tried to contain her pleasure. Her hips jerked and juttered, her body crying out for more. Celestia nodded at the appropriate times in the story, and she tried to ask relevant questions, but she could barely think. It was all she could do not to cum right then and there, to let out the secret that she was such a debauched, horny pervert that she had taken to letting her own sister play with her wet, wanty pussy in public.

“And we went out to dinner, and, well, one thing led to another, and we decided to give this thing a try.” Twilight finished her story, smiling brightly at her mentor. Celestia tried to match the smile as best as she could, but the princess was unsure as to how successful she was; she was a shuddering, sweating, trembling mess, and Twilight slowly seemed to notice. “Princess? Are you sure you're okay? You're looking a bit under the weather.”

“Oh, I'm f-fine,” stammered Celestia. Her entire body was aflame, her heart pounding in her throat. She could feel the marecum drooling down her thighs, her cunt spasming around her vibrator. She tried to distract herself with her drink, but it was next to impossible to fight off her impending orgasm. She glanced over to Luna with pleading eyes, although her sister didn’t even look back at her. “Just… A little bug has been going around. Nothing to worry yourself with, I’ll be f-fine once I get some sleep.” Celestia giggled nervously, her anxious laughter morphing about halfway through into an almost anguished moan. “Haven’t had much rest lately. Putting this cotillion together was something of a… That is to say, my hooves were full.”

“I hope it’s nothing serious. You look all out of sorts. Be sure to take care of yourself for a change, princess.” Celestia wished Twilight wasn’t such a worrisome, concerned friend, because she really needed to get away from the public eye, maybe barricade herself in a restroom and let this wave of pleasure wash over her until Luna saw fit to stop torturing her. “I know how important this was to you, but you have to take care of…” Twilight’s expression furrowed, her ears twitching slightly. “Do you hear that?”

“Hear… what?” Celestia’s heart just about stopped in her chest. This was bad, very bad. Twilight was very perceptive, and curious to boot. If she found out what was going on, Celestia was liable to die on the spot from sheer embarrassment. She bit her lip, contemplating putting an end to things. One quick flourish of her magic, and she could turn the toy off, save herself from being caught. It would be so easy, and Luna would never have to know.

No. Celestia couldn’t. She had promised to follow Luna’s orders, and she wouldn’t dare disobey her sister, least of all on her special night.

“I’m not sure. It sounds like… Like some sort of buzzing?” Twilight glanced around, trying to discern the source of the sound. “Hm… Maybe it’s the light?”

“P-perhaps… Well, it has been wonderful catching up like this, but I really should go see the other guests,” said Celestia, hoping to quickly move past the conversation about the noise and get to safety. “I’ll have to catch up with you, and Sunset, a bit later.”

“Of course! Hope you’re feeling better soon, princess.” Twilight, who seemed to be satisfied enough with her conclusion of the sound, craned her neck around the ballroom. “Speaking of Sunset, I should go find her. I think she wants to dance.”

“Do let her lead, won’t you?” Celestia smirked despite her predicament, knowing just how uncoordinated her student could be. Twilight rolled her eyes, but returned the grin before waving to Celestia and bidding her farewell as she departed in search of her date. Celestia let out a sigh of relief before taking a moment to collect herself to do much the same as her student.

“Have you seen Luna?” Celestia asked every guest, server, and member of castle staff that she passed, and they all had similarly disappointing answers. Celestia was a mess, her wings quaking and her hips bucking at nothing as she hurried around the ballroom like a chicken with no head. Her sister knew her well, knew just how much stimulation would be enough to drive Celestia mental while being just shy of enough to push her over the edge. Celestia was starting to feel almost lightheaded, her entire core buzzing with electric, mind-melting pleasure. She stumbled around the ballroom, searching high and low for somepony that knew somepony that knew were Luna had gone off to. She was so distracted, so absorbed in her attempts to hold off from cumming, that she didn’t see or hear as the one pony she was looking for snuck up behind her.

“Five minutes.”

Celestia jumped when she heard the voice, the sensual, breathy whisper right in her ear. She glanced from side to side, just to ensure that she wasn’t attracting attention, but didn’t dare look back at her sister without permission.

“Five minutes,” hissed Luna again. “Wait here for five minutes, then go to the second floor’s first guest room. That’s the stroke of midnight. Just five minutes, and not a second more. It would be foolish to keep me waiting. Understood.”

“Yes, sister,” panted Celestia. “Five minutes. Second floor. First guest room. Don’t be late.”

“Good girl. I’ll be waiting.” Just like that, Luna was gone as quickly as she arrived, leaving Celestia alone with her thoughts of what was to come. Her nervous anxiety became anticipation, desire. She had been good up to this point, done everything Luna had asked. Amused her, honored her, pleased her. And, in five minutes, Celestia could only imagine that she would be rewarded for her good work.

Those five minutes were the longest five minutes in Celestia’s entire life. Five minutes where she could do nothing but endure Luna’s torture, just fidget around and pray to the goddess above that nopony noticed her. Her eyes were glued to the clock on the back wall as she bounced around the ballroom, watching the minutes slowly drag along. It felt as if the clock was stopping, time itself conspiring against Celestia. She was barely keeping herself together, barely moving her legs as she walked for fear of shifting just so and cumming her brains out on the middle of the ballroom.

The deep gong of the clock stole Celestia’s attention away from her own nether regions. She looked up to the clock, her heart skipping a beat; 12 o’clock had finally arrived, and she could hardly believe it. She looked around, to the various ponies dancing and chatting and getting increasingly drunk, before hurrying as quickly as she could up the stairs. The guest rooms were just down the hall from her dressing room, but, to Celestia, it felt as if it was on another planet. Finally, after what felt like an eternity, Celestia made her way down the corridor to the first room on her left, and, after giving one last check to make sure the coast was clear, pushed open the door and stepped in.

The room was dark, the only light coming from a wide beam of moonlight shining through the window. It was sparsely decorated, as far as castle bedrooms go, with only a bed, a chest, a desk, and a wardrobe occupying it. None of that particularly interested Celestia, though. No, what stole most of Celestia’s attention was her sister standing before the bed, bathing in her moonlight. She looked beautiful, divine, almost other-worldly.

Most importantly, though, she looked horny.

“Lock the door,” she ordered. Celestia nodded, using her magic to do just that. “Panties off. Now.”

The firmness, the unwavering conviction in Luna’s voice nearly made Celestia melt. She was putty in Luna’s hooves, just a few words more than enough to make her bend to her sister’s will. Celestia barely hesitated before turning away from Luna and pulling her dress up. She could imagine Luna licking her lips at the sight, her bountiful ass almost consuming the delicate black garment. Celestia bit her lip and moved slowly, partly to give her sister a show and partly to hold off from cumming, gripping her panties with her magic and pulling them down her hips. Her legs quivered as she stepped out of her soaked panties, her breathing picking up as she heard Luna approach.

“So needy. The party must have done a number on you,” laughed Luna. Celestia moaned when she felt Luna’s tongue against her flank, just barely dancing away from her pussy. Pleasure became pain as Luna nipped firmly down, nibbling on Celestia’s ass. “You haven’t cum without my permission, have you?”

“No, sister. Not at all,” promised Celestia. “Please…”

“Good girl.” Luna chuckled, diving her head down even lower, her mouth just barely grazing Celestia's sensitive outer lips. She grabbed at the toy stuffed in her sister's cunt with her teeth, slowly pulling it out and dropping it to the floor. Celestia let out a gasp as the toy left her, jerking her body towards her sister, whining as Luna pulled away. She wanted her, needed her, and yet she felt so far away.

“Please, Luna, I'm begging you,” whined Celestia. “Please…”

“I’m impressed,” said Luna, ignoring her sister’s begging. “You managed to make it this far without being caught. I saw you speaking with Twilight earlier. Just imagine what she would think if she knew what was going on…”

Celestia whimpered, her entire body burning at the very thought. She loved this feeling, and Luna knew it. It was why she was so slow and methodical, taking her time to cross the room and remove her own dress. She laid it delicately across the bed before taking a seat beside it, laughing derisively at the sorry state she had left her sister in.

“Well? You’re no good to me over there,” said Luna. “This is my celebration, remember? So I expect you to put your talents to use.” Celestia began to argue, to beg for release, when Luna slowly spread her legs, showing her sister that which she had been dreaming of all night: Luna’s hot, wet, juicy pussy, winking with desire. “You’ve been a good girl tonight, Tia. Come get your treat.”

Celestia all but ran across the room, her own desire almost forgotten. All she wanted now was to taste her sister, to take her breath away, to make her happy like she deserved to be. Now, she had the opportunity to do just that, and she jumped at the chance. Luna just watched, chuckling as her sister enthusiastically hurried to bury her face between her legs.

She could feel the heat radiating from Luna as she dove in, kissing her sister’s thighs, working her way up to Luna’s sweet, dark pussy. Celestia traced the curve of Luna’s mound, relishing in her sister’s gentle moans. Celestia took great pride in being able to make Luna react in that way, as she knew that nopony else could. She doubled her efforts, kissing and licking around Luna’s lips before wiggling her tongue into her hot, juicy cunt.

“Someone’s hungry,” noted Luna with a smirk. Celestia enthusiastically nodded, wrapping her lips around Luna's winking, throbbing clit and giving it a firm suckle. Luna groaned in approval, patting Celestia on the head as she worked. “Good girl, good girl… I suppose you've earned more of a treat, hm.” Celestia whined into her sister's cunt, sloppily kissing and licking her honeypot as she nodded eagerly. “Very well. The chest at the foot of the bed has some toys for us to play with. Go pick one.”

“Thank you, sister dearest,” breathed Celestia as she pulled away. She took a moment to savor the tangy, sweet, addictive taste of her sister's pussy before trotting over to the chest and popping it open. The two had accrued a veritable treasure trove of lewd instruments over the years, and it seemed as if Luna had collected their favorites in this chest: paddles, whips, rope, vibrators, spreaders, and more. Though she had a great many options of instruments for Luna to tease, torture, or fuck her with, it didn’t take long for Celestia to decide which one she wanted; she emerged from the chest with a sizeable strap-on, holding the toy by the straps of the harness as she carried it in her mouth and offered it to Luna.

“I suppose I might have guessed what you would choose,” said Luna with a smirk. She was quite fond of the toy in question, it being responsible for more than a few fun nights between the two. She took the toy in her magical glow, standing up so she could strap the harness around her hips. Celestia turned away, surprising Luna as she returned to the toy chest. “Hm? Is this not enough for you, dirty little princess?”

“I just wanted…” Celestia dug through the chest, her entire body trembling with anticipation. She let out a shuddering sort of gasp when she found what she was looking for, grabbing it in her teeth and delivering it to her sister. “This too. Please.”

Luna looked down at what Celestia had given her, smiling as she lifted the leash. It was an older toy of theirs, from years and years ago. The two had more time together then, before they took the throne and Equestria became the massive kingdom it was today. A simple collar of thick black leather, attached to a leash so that the master could keep a good grip on their pet. Etched into the leather in bold red letters were the words “Royal Pet”. Luna laughed breathily at the collar, amazed that it was still around after all these years. Celestia hadn’t worn this since before Luna’s banishment, and yet, she held onto it all these years later.

“I said just one,” said Luna. She unbuckled the collar with her magic and wrapped it around Celestia’s neck, tightening it as much as she could with actively choking her. She tilted Celestia’s face up by her chin, admiring how she looked in her collar. “But I suppose I could allow this. For old time’s sake.”

“Thank you.” Celestia yelped as Luna firmly tugged on her leash, yanking her forward until they were just about nose to nose. Luna maintained her stern, unflinching expression for a moment before softening, diving forward and kissing Celestia with authority. The elder sister melted in her younger’s embrace, humming and moaning when she felt Luna gently nip at her bottom lip. Most people would find Luna rough, aggressive, but Celestia knew better. This was passion, and it was all for her.

“Turn around,” ordered Luna. “Show me my pussy. Show me how much you want this.”

Celestia barely had control over her actions, entirely at the mercy of her sister’s commands and her own biology. She immediately turned and raised her tail, waiting with unsurpassed anticipation for her sister to mount her. She could hear Luna approach, letting out a soft moan when she felt the firm, thick plastic cock rub against her slit.

“Hm… You’ve always been a squealer, and, while I’d love to hear you scream my name, there is still a party going on outside…” Luna used her magic to scoop up Celestia’s soaked panties, balling them up and shoving them into Celestia’s mouth. “There. That should keep you quiet.”

“Mh-hm…” Celestia lowered herself down, wiggling her hips slightly in offering. She wasn’t sure how much longer she could wait. Thankfully, Luna didn’t make her; Celestia groaned into her panties as she felt Luna’s weight on her back, the tip of her strap-on slowly spreading Celestia. Luna brought her hips forward in a firm, swift motion, burying every inch of her toy into Celestia’s waiting core.

Celestia’s mind went blank, her vision doubling and stars dancing in her eyes with each fierce, deep, unrelenting thrust. Luna knew her well, knew that she needed it as harsh and rough as she could manage, a request she had no problem fulfilling. Celestia’s moans seemed to motivate Luna, each shuddering yelp causing her hips to buck a little harder, her toy to reach a little deeper.

“You must be so close,” hissed Luna, leaning forward and biting down on Celestia’s ear. She’d normally be concerned about leaving a mark, but neither of them was really in the mindset to worry about something like that. “It would feel so good to just cum on my cock, wouldn’t it? You’ve been so good to me, and you deserve release, don’t you?”

“Mmph, phnphphmr!” Celestia moaned into her gag, begging her sister for the one thing she had been craving all night.

“So desperate… So needy…” Luna punctuated each word with a particularly rough thrust of the hip and a nip on the neck. “And yet… You have to wait a bit longer, I’m afraid.” Celestia whined in protest, her whine becoming a sharp yelp when Luna harshly spanked her sensitive ass. “You should be grateful I’m considering letting you cum at all, slut. You should be thanking me for even denying you!” Luna pushed down on Celestia’s head and tugged on her leash, ramming her toy as deep as it could go. “Go on, girl. Thank me for my kindness.”

“Thnnh mnn, phnphmr…” That seemed to be enough for Luna, who pulled her sister even closer, fucked her even harder. Celestia hadn’t ever felt like this with anyone but Luna. It was special, to have someone with this much power over her, someone who knew her every inch and how to tease it until breaking point. Her entire body was on fire, fanning from her center to the tips of her hooves.

“Good girl,” purred Luna, running her tongue up Celestia’s horn. “I think you may have earned some release after all.” Luna slapped Celestia’s ass, gripping her hips firmly as she rocketed her hips forward, relentlessly bouncing her pelvis against her sister’s cushy flanks. She could almost feel Celestia tense, her eyes squeezed shut in nearly agonizing bliss. “Cum for your mistress. Cum for me.”

Celestia squealed into her panties, unable to hold off even if she wanted to. She felt her pleasure reach a crescendo, her orgasm washing over her. Celestia’s vision went faint, her legs giving out from under her. Luna didn’t let this stop her, dropping down onto her sister’s prone body and pistoning her hips down and into Celestia’s convulsing, spasming pussy. Celestia’s eyes rolled back in her head, a second orgasm crashing down onto her even harder than the first. Her entire body quaked, and she was certain she’d be unable to speak even if she wasn’t gagged. For now, all Celestia could manage was a low, shaky moan into her mouthful of panties. Luna pressed herself down onto Celestia as she came down, nibbling down on her ear gently.

“Eclipse,” whispered Luna, signaling the end of their session with their safeword. Celestia hummed her understanding, her entire body numb, her mind awash with contented pleasure. “Do you think you can stand?” Celestia tried to push herself up, but her legs felt like jelly, and she quickly collapsed to the floor again, shaking her head. Luna chuckled, pulling out of Celestia and helping her to her hooves. Celestia threatened to collapse again, until Luna slid a wing under her to add support and stability. Together, they walked to the bed, and Luna pushed Celestia onto its surface. She went about removing her harness, using her magic to ungag Celestia.

“Thank you,” said Celestia shakily. She rolled over to her side, patting the empty spot next to her for Luna to join her. The Princess of the Night did just that, slithering into the bed and snuggling up close to her unconventional lover.

“You needn’t thank me. In fact, I should thank you,” said Luna, kissing Celestia deeply. As fun as the sex toys were, the two often lived for these quiet moments after the fact, where they could just cuddle and enjoy each other’s presence. “You’ve been very good to me. Better than I deserve.”

“Hush, you. I love you, and if you don’t deserve that, then nopony does.” Celestia purred in contentment, nestling as close to Luna as she could, until she could feel the pulse of her beating heart. “My only regret is that we’re going to have to cut our moment here short.”

“About that… I may have told Raven Inkwell to inform the guests that you had to retire to your chambers on account of a terrible migraine.” Luna grinned, that genuine, wholesome grin that Celestia knew was reserved for her and her alone. “And before I left, I made the excuse of dreamscape issues that needed my attention. So… We could stay here together until morning.”

“That sounds perfect.” The two kissed again, and Luna was wearing a smug little smirk when they broke away. “What’s that look about?”

“I think this may be unwise,” said Luna, in a poor imitation of Celestia, although the princess still found this little bit of teasing amusing. “That’s how you felt, no? What about now? How do you feel now?”

“I feel like the luckiest mare to ever live.” Celestia sighed, nuzzling up against Luna’s neck, wrapping her body with a large alabaster wing. “I love you, Luna.” Luna closed her eyes, enjoying the warmth and closeness that she had never experienced with anyone but Celestia, losing herself in the safety, the protection of her embrace.

“I love you too, sister dearest.”