Dear S̶i̶s̶t̶e̶r̶ W̶i̶f̶e̶ Wister?

by thathornypony

Rating: mature
Tags: Princess Celestia, Slice of Life, Princess Luna, Porn, My Little Pony: Friendship is Magic, Fetish, Romance, Sex, Twilight Sparkle
Length: 4102

Celestia and Luna are married. Did you know that? Because Twilight sure didn't. She wishes she still didn't.

Celestia and Luna are married. Did you know that? Because Twilight sure didn't. She wishes she still didn't.

Celestia doesn't see what the big deal is. She loves her wife and her wife loves her, isn't that all that matters? So what if they happen to be related.
Dear Sister Wife Wister?
Written for the Incest is Wincest April Contest

Published 2019-04-28 05:00:01 UTC
Last updated 2019-04-28 05:00:01 UTC

Chapter 1

Celestia's meeting ran late. It was for legitimate reasons—the business really couldn't be put off for later—but it was still annoying. Especially since she was supposed to meet Twilight for tea afterwards . Celestia had been looking forward to it all day.

Everypony was at last appeased, and she went. She trotted quickly through the castle. Gracefully, of course, she was never anything less.

She opened her door. There was a loud yelp as she did so. She looked around and saw a very startled Twilight by her fireplace. Somepony had gotten nosy, it seemed. How scandalous. Celestia smirked internally. "I'm sorry I'm late. But at least I see you found a way to entertain yourself."

Twilight launched into her usual nervous stammering and panicking. She was holding something.

"What did you find there? It's okay, I don't mind you looking around." Celestia really was curious. When Twilight had been her student she had always loved explaining the histories of all the little things she had collected over the years.

Her heart fluttered when she saw the little box. Oh. She hadn't thought about that in a long time. She took it from Twilight, who sheepishly floated it over, and opened it, taking the ring inside out. She turned it over and over. It was funny, it was a while since it had stopped being too painful to look at, but she had still kept it tucked away, just out of habit. She smiled. It was a beautiful piece of jewelry, silver and sapphire, given to her by an even more beautiful pony.

She dug up a vein of mischievousness along with all the old memories. The look on Twilight's face when she heard the story was going to be priceless.

She sat, and slipped the ring onto her horn, and pulled a mirror over to examine herself. "It's been a long time, but I think it's as pretty as ever," she said.

Twilight was still a bit wide eyed. Still processing what her little discovery meant, no doubt. "I had no idea you were married, Celestia," she finally got out.

"Not many ponies do. It was a long time ago. I've never met anypony else that I loved quite the same way."

"Would you mind talking about him?"

Celestia had never talked too much about love with Twilight. But she was surprised for a moment at just how thoroughly she had avoided the subject. Oh well. Twilight was about to get a good teasing regardless; this was just one more piece of ammunition. She smirked. "Her, actually."

She waited just a second for Twilight to begin apologizing, then cut her off at the first syllable. "It's okay. I never told you; how could you know? But yes, I prefer mares."

"O-okay," Twilight said.

"And just to be clear, I am being coy here. I could tell you, but it's more fun to make you guess. Thinking of her always puts me in a playful mood. It's somepony you've heard of, by the way." It was true. Her wife had been her accomplice in many practical jokes through the years.

More importantly, those words switched Twilight from worrying about having offended her to analytic mode. She muttered to herself.

"Clover the Clever!" she shouted, hopefully.

"A fine mare," Celestia said, "very pretty, and intelligent. But no."

Twilight wasn't deterred. She never was by a good question. It was going to take more than a few wrong guesses to stop her; once she latched on to a question, there was no stopping her. It assuaged most of the guilt Celestia felt for stringing her along.

Celestia whistled. To Twilight it seemed like she was just filling the silence between answers. That there was only one other pony who knew the code in that whistling was exactly the point of said code.

"Somnambula?" Twilight said.

Celestia had to raise an eyebrow at that. "Somnabula? Hmm. It would be hard to resist going on a date with her if she asked, I will admit. She is so very cute. But alas, no, I never married her. You are getting closer though."

"Closer, closer, closer…" Twilight whispered. She was so adorable when she was like this. She raised a hoof. "Hold on. If this mare is a historical figure in her own right, why doesn't anypony mention that she was your wife in the history books?"

Celestia sighed sadly. "Attitudes shift over time, as does what is considered acceptable. Unfortunately, some time ago, ponies decided that it was not seemly for her and I to be known to be married, and edited the histories accordingly. They couldn't cut her out completely, but she couldn't be my wife in their eyes."

"I'm so sorry to hear that."

"Thank you. It is one of the frustrating parts of being a princess: no matter how much I might want to, I cannot control everything my ponies do. That would not be good for anypony." Celestia might not have been Twilight's teacher anymore, but that was no reason she could not continue to be a font of wisdom.

They were both starting to settle into silence when the door opened. Luna walked in, answering her call.

Celestia kept her face composed, but inside she was filled with glee. "Ah. And how is my darling wife today?" she said.

For a split second, a questioning look flashed across Luna's face. It quickly vanished, transformed into a smile when she noticed Twilight in the room. "I am well, dear," she said. She sauntered over to Celestia and kissed her on the cheek.

Celestia was filled with warmth. All joking aside it really had been far too long since she had thought of Luna as her wife. She had just been glad in the recent years to have her sister and fellow princess back. The kiss felt nice.

Meanwhile, Twilight had stopped. She sat perfectly still, her eyes wide and her mouth hanging open. She wasn't even breathing. She didn't need too, but it was sort of a hard habit to break.

She'd be fine. Celestia turned her attention back to her terribly neglected spouse. Pretty, pretty Luna. Celestia had just been the worst to her. She had welcomed her back, but she hadn't welcomed all of her. That was a mistake she intended to correct.

She nuzzled Luna's cheek. "She found the ring you gave me," she said. "To be honest with you I had forgotten about it, with everything that's been happening lately."

Twilight's brain finally finished rebooting. "YOu're married!? To each other!?"

Luna wrapped a wing around Celestia. "Yes we are. I see Celestia didn't tell you, but is it truly such a surprise?"

"B-but you're sisters!" Twilight said. Her mane had somehow gone unkempt in the few minutes she'd been sitting there.

Luna raised her eyebrow. "Indeed we are."

Celestia chimed in. "Ah. This would be yet another thing I forgot to explain to you about modern Equestria. Ponies ideas about family relationships, even noble ones, have changed quite a lot. They are a deal more restrictive. And so even our marriage is considered the same as common incest."

Luna snorted. "That's ridiculous!" She launched into a rant about all the ways things had degenerated in her absence.

Celestia turned her attention back to poor Twilight. "Our situation is a bit complicated. It's a fun story. Long ago, when Luna and I had just come to Equestria, ponies were not used to being ruled by Princesses. Many of the laws were made by a council of ponies from the three tribes.

"They were quite resentful of us showing up and taking away so much power. They passed a law requiring us to marry to keep the throne. Until then they would rule as regents. The idea was that we would marry into some of their families and they could keep power that way.

"You would not believe all the effort those nobles put into wooing us." Celestia stopped and broke out into laughter. She laughed until she was doubled over and wheezing. "A-and the looks on their faces when Luna and I announced our decision… HaHAhaha." She broke into another fit of giggles. "You can guess by now what we did," she said, when she had regained her composure, "Not one of them was the least bit convincing that they were interested in more than power—hardly attractive prospects. But the law was the law, and so we had no choice but to choose. They never even considered that we could marry each other.

"The whole nobility of Equestria was furious. But there was nothing they could do: we played by all the rules. One of the consequences of how political marriage was then, was that marrying within your family was accepted, if not common. 'Keep the bloodlines pure,' and all that. I like to think that love has become a more important criterion under our supervision."

Twilight seemed relieved at every syllable. She took deep breaths. "Okay, I think I can handle that. It seems a little sad though, to be forced to marry like that." She wrinkled her nose.

Celestia smirked ironically. "It's not so bad. I'm reasonably fond of Luna. I have not regretted having her as a wife."

"I didn't mean it like that! I—"

Celestia held up her hoof. "Just let yourself relax, Twilight. Don't think about it too much if it disturbs you. You cannot help when you were born." It was time to give the mare some mercy. Celestia had put her through enough with their conversation.

She was quite confident that she had cut Twilight off before the conversation could go toward whether Celestia was a pervert. Celestia was indeed a pervert, and Luna too, but Twilight didn't need to know that just yet. Meanwhile Luna was still raving on in the background, as she did.

"—are absurd. They can't be bothered to make any kind of distinctions between different circumstances." Luna drew herself up and slowly, purposefully turned toward Celestia. "This will not stand; we must correct it. We must reconsummate our bonds and tell all of Equestria!"

With that pronouncement, she pounced on Celestia. In a flash they were both on Celestia's bed. Celestia was laying on her back, Luna was straddling her, and their lips were pressed together. Poor Twilight Celestia thought not very guiltily as she gave in to her sister's passionate kisses.

She hadn't planned to go this far in front of Twilight; the sex had been supposed to come later. Those thoughts soon disappeared. When you were having sex with Princess Luna, you did not think of anything else. Through all the problems and rifts in their relationship, their bedroom had never held any trouble.

The point was, Celestia was quickly becoming extremely aroused. Luna was good at that; that's what happened when you were in a relationship for centuries. She knew what Luna liked, and oh did Luna know what she liked. Celestia was practically whimpering with pleasure and anticipation of what Luna's hooves, tongue, magic were going to do to her already. Memories of sensations she had not felt in a thousand years came welling up.

They had both agreed, a long time ago, that prostitutes didn't count as cheating. The old rules were convenient like that. Even still, not in the whole millenium that Luna had been away had there been a whore in Equestria who could match her prowess at making Celestia cum. Honestly, Celestia wondered why she hadn't fucked Luna first thing when she had come back.

But Luna was on top of her now, and sex was imminent. All was well.

All was well, unless you were Twilight Sparkle, that is. Twilight had always thought of the Princesses as mentors and friends. Every time she saw them she prepared herself to learn something. She had never prepared herself to watch them do it. It was so wrong. Wrong for two sisters to be doing this to each other. Wrong for her to be watching them. Wrong for her to be enjoying the sight.

"Behold, Twilight, the glory of our bodies!" Luna shouted.

Celestia felt Luna's magic pull her tail down and tuck it under her, then spread her cheeks and labia. Twilight was going to get the whole show then. Oh well. If they were all going to be princesses together, it was just as well that they familiarize themselves with each others marehoods.

Twilight gaped. Everything was right there for her too see. Both Celestia and Luna were totally exposed.

Theoretically, they were all princesses in that room, equals. The reality was that she and Cadence were Princesses. These two were a step above. In other words, these were The Royal Genitals that Twilight was looking at, gazing at.

Without a doubt these were the most perfectly curved asses. The most perfect vulvae anypony had ever seen. The most perfect clitorises in the most perfect folds. All in a state of visible arousal. It should have been wrong, Twilight should have been disgusted and shocked like she had been just a few minutes before. But she wasn't. She was aroused. She liked what she was seeing.

Celestia didn't do anything. She just laid there letting Luna take charge. She had always been a bottom.

Luna lifted herself up, opening a gap between them. Celestia missed the warm pressure of her sister's body for a moment, until she found the reason for it. Luna lit her horn up and grabbed Celestia's nipples with her magic. She tugged the little pink points up and away from Celestia's body.

"Ah," Celestia gasped. Luna kept tugging, pulling, harder and harder. Soon Luna was magically fondling her teats with an almost abusive intensity. Just the way she liked it. She knew Luna liked doing this too. Because as much as Celestia liked having her teats roughed up, as extremely aroused as it made her, she couldn't cum from it. Luna knew she could keep doing that forever and Celestia would get nowhere even as she degenerated into a quivering, dripping mess. A pile of horniness in the shape of a pony.

Celestia was utterly helpless. She literally could not do anything but lie there and let Luna do what she was doing, no restraints needed. With each passing second she could feel herself becoming wetter, more desperate. It had been far too long since she had felt this.

Only Luna could do this to her. She had slept with many ponies and told them exactly how to touch her. But only Luna's caresses, pinches, slaps, were so debilitatingly pleasurable. Worst of all, Luna knew exactly how pleasurable Celestia found it, and she was merciless. There had been times when Luna had made her wait days for release. Subjected her to days of unending, ever building stimulation. It was torture of the best kind. The end result is that Celestia had absolutely no idea how long Luna would spend teasing her. There was nothing she could do, nothing she could offer to speed it up.

Celestia moaned. She looked up at her sister, pleading. Somehow she had forgotten what Luna could do to her (and what she could do to Luna), even though now that she thought about it a thousand years did not seem long enough.

Luna bent down to kiss her one more time. Celestia relished the taste of her lips and tongue and mouth. More than that a warm happy feeling filled her. Finally she was with her wife again like she should have been so long before. There was not one pony in Equestria that she loved the same way she loved Luna. The reverse was also true. Nopony loved her like Luna did.

Luna broke the kiss. Then, with graceful steps, turned around. She settled down again. Celestia's vision was filled with the beautiful blues and blacks of her ass. Luna kept her tail held high.

Celestia did the same thing she had always done when she was confronted with this ass. She stared at it, taking in the sight. She traced the gentle curves of Luna's flanks. Counted all the splotches of her cutie mark. Gazed into the dark flesh of Luna's marehood. Luna winked, and the pink of her clitoris was almost shining from the sheer contrast. Luna's dark lips always did such a wonderful job of making everything they concealed alluring.

And those were just the sights. Luna was a delight for all the senses. Celestia smelled her arousal, the peculiar scent that only Luna's cunt could produce. It was intoxicating, almost like a stallion's musk, but still unmistakably feminine (to Celestia who was something of a connoisseur of such scents). Even the subtle warmth that radiated from Luna's body was satisfying on a deep level. And the taste…

She still didn't touch. Luna went first, that was the rule. It was a hard rule to follow; Celestia knew just what she was missing. She could see Luna getting wetter by the second right in front of her. Luna wasn't saying anything, but her lips were so clearly begging Celestia.

As usual, Celestia was so enamored with her sister's body that she failed to pay attention to what she was doing. Luna began to lick her; she let out a yelp that was as much from surprise as from the pleasure of the sensation. Luna wasn't licking her pussy. No that was far too straightforward. She had only begun to tease Celestia. No, Luna was licking her thighs. Gently, gently, gently dancing across the flesh of her inner thighs with her tongue. Slowly, methodically. And yet there was a sense of whimsy to it, as if Luna were just dragging her face on its merry way across Celestia's legs. Sisterfucking often made Celestia wax poetic.

Her thighs were very nice, but they were not what she needed. Celestia's need was farther below. She ached with desire that made her feel terribly empty. Her cunt was begging for something to please fill it, or even just touch it. She could feel the slickness inside her. As she shifted positions her walls rubbed ever so slightly against each other. She could feel herself leaking, literally dripping with arousal. Wouldn't somepony just take advantage of it and shove something in her?

Her fate was a terrible one. Celestia and Luna both had plenty of sex with other ponies (or had, before Nightmare Moon). But while their beds were not exclusive to each other, their marriage still meant something. In other words, somepony else might have fucked Celestia. But Luna? Luna wasn't going to do the quick thing her body wanted. Luna was going to make love to her. They were going to be lucky to get the sun lowered and moon raised on time.

The thought of the hours of sensation ahead of them intensified the sensation Celestia was feeling then.

It was like torture. Luna was touching her, playing with her. Celestia could feel her tongue and lips, her hot breath all so close to her pussy, but never quite giving her what she needed. Her clit was throbbing.

Luna tucked her head down and started nibbling at Celestia's teats. And of course she had been holding out when she'd done the magic fondling. Now, with her mouth she gave Celly the good stuff.

Celestia was halfway between ecstasy and being tortured. It felt so good. But she needed more. She whimpered. How long had Luna been teasing and denying her? It had to have been hours.

"Celestia?" Luna said, pausing for a moment too short to get an answer, "I love you." She licked Celestia's clit.

Celestia was so pent up that a little orgasm rolled through her at the first tap of Luna's tongue. It was bliss. She shivered. But it was only a moment of bliss that did nothing to sate the hunger in her loins. Celestia was still every bit as horny.

Blessedly, Luna continued. Her tongue dug into Celestia's pussy, each little flick setting her nerves alight.

There were tears in her eyes. Her sister delved into her. Celestia did not think anymore. Luna knew her pussy as well as she did, even after a thousand years away. Celestia writhed underneath the moon princess—who should have been the Princess of Cunnilingus, Celestia liked to say. Luna was no longer teasing, she went straight for the most sensitive spots. Luna tugged on the thick lips of her pussy. Celestia was a swamp at that point, soaked with her own juices and Luna's saliva. Luna kissed her right in the middle of it. Luna curled her tongue and cradled Celestia's clit with it.

Celestia screamed. She had already been panting and gasping. But Luna's tongue was magic, and her gasps turned into full on shrieks. She came again and hard. This orgasm was much more satisfying than the first. She still was not sated, but her head was a little clearer.

Clear enough to appreciate what was in front of her. Her sister's pussy was so pretty. Something deep inside Celestia relaxed. This was all just like it had been back before they had made so many mistakes. They would get each other all worked up. Then Luna would take the lead, pleasuring every inch of Celestia's body. Celestia would enjoy it until she started to feel guilty about not returning the favor.

That was the stage they were at now. Fortunately, it was a simply matter of Celestia raising her head to stick her snout right in Luna's cunt. The taste was divine. Luna's moans were even better.

Her little sister started to rock her hips, grinding against her face. Celestia pressed back, burying herself between Luna's cheeks. Luna showed her appreciation by continuing to relentlessly eat Celestia out.

Both ponies moaned loudly through each other's pussies. The sisters were never closer than when they were sixty-nineing. Physically, obviously. But they both got touchy behind closed doors. Few ponies in modern Equestria knew they were married; even fewer had ever known that their relationship had started before their marriage, which had been calculated to appear simply as a clever political maneuver. Celestia loved her sister—she had no other family. But Luna was more than a sister to her. Luna had been her lover for a long time. Luna loved her too, she had never doubted that. Even as Nightmare Moon had tried to murder her, she had still believed that somewhere deep down, Luna still loved her. She had been proven right. She was being proven right at that very moment as Luna fucked her.

Luna came in her face. She was always so much wetter than Celestia. Celestia wished she could squirt sometimes, to make up for all the times Luna had poured marecum all over her face (not that she minded). Regardless, she welcomed every drop of moisture her wife gave her, licking up everything that didn't go straight into her mouth. Carefully, though. It was for Luna's pleasure as much as hers. She carefully cleaned every inch of Luna's ass. And of course that was only Luna's first orgasm.

But even alicorns need to take breaks. Luna rolled off and lay beside her. They were both breathing heavily. The air was filled with the distinct smell of sex and sweat.

Celestia looked down at Luna. She was a little frustrated. Her partner had cut things off before she could cum again. Aside from that, she felt content… relaxed. "It's been too long," she whispered.

Her gaze drifted further down. The eyes of their spectator were much less alluring than those of her love. She had completely forgotten about Twilight. But there she was. And. she. had. seen. Everything.

Twilight was frozen in place, as still as a statue. Her eyes were wide and her mouth agape. Her wings were also spread wide—it seemed some part of her had enjoyed the show.

Celestia wasn't embarrassed. She was far too old for that. Her only concern was for Twilight.

Reluctantly, she got out of be and approached her former student. "Are you alright?"

There was no response.

Celestia stretched her wings. "Luna and I are going to be a while. Would you like me to teleport you back to Ponyville?"

There was no response.

This silence, Celestia decided to interpret as a 'yes.' Her horn flashed and her magic whisked Twilight away.

She turned back to Luna. She would be getting a letter about all this, but she hardly cared about that when she had a wife to fuck. And sister.