As Old as Your Omens

by Captain_Hairball

Rating: mature
Tags: Princess Celestia, Sex, My Little Pony: Friendship is Magic, Princess Luna
Length: 4561

The immortal sisters take solace in each other’s bodies. But Celestia’s joy isn’t complete — she wants a stallion, and she wants to be a mother again. Luna and the wonders of Equestrian magitech are ready to rise to the challenge.

The immortal sisters, the only ponies who understand what it is like to live forever, have begun to take solace in each other’s bodies. But Celestia’s joy isn’t complete — she wants a stallion, and she wants to be a mother again.

Luckily Luna and the wonders of Equestrian magitech are ready to rise to the challenge, so to speak. Luna isn’t 100% on board with the ‘putting a foal in sister’ part, but they can just talk that part out, right?

Contains: Semi-rough lesbian/futa horse sex, relationship talks, oral, vaginal, and anal, breeding, internal cum-shots.

Edited by Rush and Scoots. Pre-read by Prince Lighting Stike and Zyrian

Published 2017-09-11 14:10:06 UTC
Last updated 2017-09-11 14:10:06 UTC

A Good Seed

Author's Note

This story contains fictional depiction of erotic parent/child and/or sibling incest. This is intended as a fantasy. Fiction is a safe space. In real life, the author does not consider consent possible in these relationships and does not support or condone them.

A Good Seed

Pre-dawn light fell across the bodies of the sisters in their secret tower bedroom. The twilight hours had become their private time together, and most of their subjects would have been shocked by how they used it. The two of them had grown much closer in the months since Starlight’s visit. Much, much closer. They had begun spending the morning and evening hours together, making fruit pancakes, sniffing lavender, and talking about the years they had been apart. They had realized they had something in common that no other living pony did — the experience of living for centuries. It was this commonality that lead them to another discovery: the Westermarck effect had a sell-by date, and theirs was long past.

“Harder, sister!” Luna, on her back with her legs in the air, bucked her slim indigo hips against Celestia’s face.

“Hold still!” said Celestia. “I can’t suck on your clit if you keep moving it!” She pushed her hooves against Luna’s trim belly, trying to make her stay in place.

“Let Us help you,” said Luna, wrapping her magic around the back of her sister’s head and jamming her nose into her pussy.

“Mgh mggger!” said Celestia. Her sister’s sex smelled heavy and pungent, like a tropical fruit. She twisted her neck until her lips were over Luna’s tiny, hot little clit, mashing her nose painfully against Luna’s pubic bone in the process.

“You are most welcome, sister!” Luna jerked her hips up into the air, grinding against her sister’s face. Her breath grew hot and ragged. Her long, slim thighs trembled against Celestia’s cheeks. The magic holding her head flickered and frizzled. Luna wailed. Celestia groaned delightedly into her sister’s pussy — as Luna’s climax filled her body with pleasure, so it filled Celestia’s heart with joy.

Later, when passions had cooled, they still lay in bed together. Celestia nuzzled her dozing younger sister’s cheek and wrapped her wing around her. She had missed sex more than she'd realized. She missed a stallion's body, still, and she missed having a foal in her belly even more. But that was not to say that what she'd discovered with her sister was not wonderful. Her sister was vary passionate. And sweet. And cunning. And subtle. Which reminded her of something she needed to deal with right away.

Celestia sighed, and pushed herself up to look down at Luna. “I was going over your proposal for the Night Guard budget,” she said, “and I had a few questions.”

“Please, sister, is now really the time?” said Luna, batting her eyelashes sleepily. “Why waste this precious hour discussing matters of state?”

Celestia rubbed her muzzle against her sister’s. “It’s about those forty-thousand-bit toilet seat covers we discussed.”

Luna squirmed up her sister’s larger barrel. “Our thestrals’ bottoms are so sensitive, yes. They deserve only the best.”

Celestia sighed. “Luna. My beloved. We agreed you could have one hundred and twenty of them. Four-point-eight million bits is more than sufficient to keep your Shadowbolts at an adequate level of readiness.”

Luna laughed. “Shadowbolts? Surely, sister, you are aware that there are no such things as Shadowbolts”

Celestia clenched her teeth. “But if they did exist, four-point-eight million bits would be plenty.”

Luna shrugged. “As long as we are speaking hypothetically, then yes, that seems like a reasonable budget.”

“Then why,” said Celesta, “did last year’s budget contain a requisition for two hundred and twenty-five toilet seats?”

Luna smiled one of her smiles. Young Luna had had a number of very distinctive smiles — the ‘holier than thou’ smile, the ‘Starswirl likes me better than you’ smile, the ‘I’m smiling so politely that it somehow becomes rude’ smile, and of course the ‘I’m about to usher in eternal night’ smile. Mature Luna had added several more, including the ‘I’m about to talk you into something that will make you ashamed of yourself for the rest of your very long life’ smile. Guess which smile this was. “Oh, We were wondering when you’d notice that. We wanted it to be a surprise,” purred Luna.

Celestia’s eyes narrowed. “You wanted embezzlement to be a surprise.”

“We guarantee you are going to love this,” said Luna, clapping her hooves. “We will clear our schedule for the coming night. Meet Us in the sub-sub-sub-sub-basement after moonrise.”

✭☆✭☆✭☆✭

Celestia did not love the surprise. She did not love it at all.

They had walked down through two levels of storage, past the offices of the EUP Corps of Engineers Special Projects Division, past the kraken tank, and down to a level of the palace that Celestia knew for a fact hadn’t been used since before she was born. The vast columned vault had been cleaned, the marble polished until it gleamed. Ponies in lab coats moved back and forth purposefully across the chamber, talking with one another, looking at clipboards, or pushing racks of potions. In the center of the vault was a pedestal with the letters ‘P.R.E.’ boldly embossed on a steel plate.

“Principality Research into Eugenics,” said Celestia, trying to remain calm.

“Yes.” said Luna, smiling innocently.

“PRE,” said Celestia.

Luna nodded. “We thought of it ourselves. Do you like it?”

“Pre,” said Celestia, eyes narrow with rage.

Luna snorted and covered her mouth with her hoof.

Celestia put her mouth close to her sister’s ear and hissed, “Please tell me that you did not waste over four million taxpayer bits on a dirty joke.”

“Oh, no, sister! This is so much more than just a dirty joke. Ah! Here is our head researcher now! Good Seed! Please report. Are the operations of PRE flowing smoothly?”

“They are!” said Good Seed, a round little gray earth pony stallion in a lab coat with small rectangular reading glasses perched on the end of his snout. “My staff is up at all hours making new discoveries!”

“Your staff is hard at work, then?” said Luna.

“Yes! Very hard! My staff never tires!” said Good Seed.

Celestia glanced at his haunch, wondering what his cutie mark was under that coat. A sprouting seed, she hoped. It could be something much worse.

“Would you care to show Our sister how your staff functions?” said Luna.

“Yes! I’m proud of my staff! Follow me!”

Celestia fell in next to her Luna as Good Seed lead them down one of the side corridors. “There is no call to be vulgar,” she whispered to Luna.

“We remember telling you much the same thing when We were younger. You never listened.”

“I was a teenager then. I’ve matured. What’s your excuse?’

Luna smiled coyly and batted her eyelashes up at her older sister. “We went mad, and were exiled to the moon.”

Celestia cringed, a cold fist of guilt clutching her heart. “You know I had no choice.”

“No. You did not. You did the right thing, sister.” Luna touched Celestia’s shoulder consolingly. The touch tingled with shameful pleasure.

“Anyhow, you were always telling Us,” continued Luna, “that We would be more popular if We were more interested in what ponies like to do at night. It turns out you were right.”

Celestia was distracted from that especially painful memory by the large, two-story room Good Seed had led them into. Against the far wall, taking up about a third of the room, was a vast difference engine, grinding and clanking as ponies fed punch cards into it. On a catwalk halfway up the wall, groups of ponies were going over long streams of tape that poured from slots on the machine. The rest of the room was full of ponies working at cubicles. Rolls of tape would be brought down from the gantry, and the cubicle ponies would look at them and mark punch cards, which would then be collected to be fed back into the difference engine. As the princesses were watching, a pony came through another door with a cart full of paperwork. This was handed out in stacks to the cubicle ponies, who began copying the contents onto punch cards.

“What are they doing?” said Celestia, her voice soft with awe.

“They are sequencing the equine genome,” said Good Seed proudly.

Oh bugger her with a fishing pole, Luna was actually doing something useful with her stolen taxpayer bits.

They spent several hours touring the labs, looking at the research division and the department of genealogical record reconciliation. A great deal of work was being done in understanding the genetic relationship between the four tribes, and it was becoming very clear that the four were really one people, different only in superficial features and the type of magic they used. Everything seemed perfectly above board, and Celestia was puzzled why Luna hadn’t simply gone through the usual channels for science funding if she was so passionate about this.

Then they got to the final section of the lab. A section locked behind three adamantium bulkheads. At each bulkhead, Luna and Good Seed had a brief, whispered conversation about whether Celestia really needed to see this. Celestia was prepared for misshapen horrors of genetic engineering, so she was surprised when the final door opened to reveal a one-way mirror looking out on a pleasantly appointed windowless bedroom. Two youngish mares were sprawled on the bed, reading magazines. Celestia was both relieved and bewildered.

“What… what is this?” said Celestia.

“Watch,” said Luna.

Good Seed leaned over to a megaphone set in the wall. “Subjects Loving Chalice and Fertile Valley, you may begin the test.”

“Finally,” said the mare with a pastoral landscape for a cutie mark, leaning over to pick up a small vial from the nightstand. Celestia had first taken her to merely be extremely fat but now realized that she was pregnant. The other mare — with a fancy cup cutie mark — sat up and bounced eagerly on the bed. Fertile Valley drank from the vial and soon began cringing as though she were in sudden pain. Celestia watched in shock as Fertile Valley’s lower abdomen began to change — the clit grew rapidly, flopping out from her body into a dark, flaccid hose. Her pussy lips stretched around it, forming sort of a sheath around the base, and she grew… balls? Faust knew where those came from. They just sort of… swelled up.

“Are you doing all right, Fertile Valley?” said Good Seed through the megaphone.

Fertile Valley gave the one-way mirror a hooves-up gesture. “I’m fine. Great, actually. I am highly aroused and no longer experiencing any pain,” she said, grinning from ear to ear.

“Very good. Please begin sexual relations,” said Good Seed.

Loving Chalice squealed, wiggled across the bed on her belly, and nosed Fertile Valley’s hose, which quickly sprang up into a fat cock with a massive flare. Too excited to bother with foreplay, she went directly to trying to get Valley’s cock into her mouth. Drool dripped from the edge of the cock’s flare, spotting the bed sheets. Celestia began to feel moist.

Good Seed began to speak again. “We’ve begun quietly reintroducing pregnant test subjects into society, posing as successful participants in more conventional fertility treatments. We’re planning on a phased roll-out beginning in…”

“Yes, yes, I’ll read the white paper later,” said Celestia, waving a hoof. Her eyes were fixed on the couple in the testing room. Chalice had worked Valley’s cock into her mouth and was bobbing her head on the monster. It was so big and so deep in her throat that Celestia could actually see the head moving beneath her skin. She needed Luna alone, very badly, right now. She glanced sideways at her sister, who smiled an especially wicked smile. Celestia tucked her thighs together and clenched her massive buttocks, hoping she wasn’t dripping on the floor.

Good Seed wasn’t paying attention, anyway. He cleared his throat. “The subjects are reminded that this is a fertility treatment, and are advised to proceed to penile-vaginal intercourse,” he said, with weary irritation.

“You make it… OH! Oh, yes, deeper, honey. You make it sound so romantic,” said Valley. Chalice made a soft gagging noise.

“Please, subjects. We don’t want a repeat of last time. We’re not spending over fifty thousand EQB a shot to have you two give each other porn facials.”

Valley began to giggle uncontrollably. Chalice slid off of Valley’s dick, lips dripping goo, and began cackling as soon as her mouth was free.

Celestia watched in fascination as Chalice, still giggling, squatted over her lover. Valley guided her shaft towards Chalice’s pussy, and both mares’ giggles turned into ecstatic moans as Chalice lowered herself onto Valley. The muscles in Chalice’s thighs bunched and stretched as she bobbed. Ripples ran through her juicy young body as she impaled herself on her lover’s cock over and over.

“I love you!” screamed Valley, gripping Chalice by the hips, looking up at her with pure passion.

“I love you and I need you to put a foal in me!” screamed Chalice.

Celestia bit her lower lip. She couldn’t take any more of this. She turned and fled, tears coursing down her cheeks.

Bears Good Fruits

Luna teleported into their room — the room was inaccessible by hoof, and a permanent semi-permeable shield would harmlessly deflect any but a very select list of ponies who tried to fly or teleport in. Celestia had stopped crying and was lying on her side on the bed, staring out the window.

“I’m sorry,” said Luna.

“I liked your surprise,” said Celestia, her voice cracking.

Luna climbed into bed behind her sister, wrapped her forelegs around her shoulders, and pressed her face against the back of her neck.

“I want a foal,” said Celestia. “It’s been so long.”

“We cannot do that for you,” said Luna. “But we can be a stallion to you. We know that’s what you prefer.”

Celestia chuckled. “Well, that’s what Cadence and Twilight were for, isn’t it? To be my foals, I mean. Not to be my stallions.”

“Oh, We know what you meant. But they grow up so fast,” said Luna, nipping at Celestia’s ear. “You should find a new protégé.”

“That is a good idea. No more alicorns, though. Five is enough, for now, I think.” Celestia rolled onto her back, four legs up in the air bent playfully. “Maybe a colt, this time. For variety.”

Luna’s eyes got a faraway look. “And lo, a colt shall rise from amongst the unicorns. And he shall grow into a mighty stallion. A crown shall be upon his head, and wings upon his back. And the nations of Equus shall tremble beneath the pounding of his hooves.”

Celestia rolled her eyes. “Please, sister, tell me that that is not a real augury.”

Luna flashed a playful grin and pecked Celestia on the cheek. “You are right. We made it up. But speaking of pounding.” She rolled onto her back and spread her hind legs. A tight pair of balls and a slim, elegant sheath nestled there, their glossy skin an inky midnight indigo.

“Oh, sister,” purred Celestia.

“If you kiss Us, We will let you taste it.”

Celestia giggled. “I don’t know, that sounds like a win/win for you. What do I get out of it?”

Luna pressed her sister back on the bed and locked her mouth on hers. Her tongue slid into her sister's mouth, caressing and probing. Celestia moaned into Luna’s mouth. Hooves slid down her barrel, slowing as she neared her sheath. Luna’s new cock rolled out, flopping across her barrel. Her sister’s gentle, leathery hooves danced over the shaft, sending sparks of pleasure through Luna’s body.

Oh, it was fun to have a cock.

“Sister, I need this,” moaned Celestia.

“I know you do, you cum-hungry little whore,” purred Luna.

Celestia shivered. “Luna! No one would dare speak to a princess that way!”

“Except another princess. Your stallion lovers have been gentle and considerate, in the past, I suppose.”

Celestia bit her lower lip and nodded.

“Careful with the royal person. Respectful of your station. Attentive to your needs.” Luna straddled Celestia’s barrel. Her cock, now hard as steel, reached from sternum to collar bone on the larger mare’s chest.

“They have been. Even the crudest soldier treated me as though I was made from spun glass.”

Luna laughed. “Well. We know you, sister-whore. We know your secret dreams. And the darkness of the moon still roils in Our heart. We demand that you feast on the cock of the night.”

Celestia rolled her eyes to look at the pulsing shaft resting on her chest. “The cock of the night? Seriously?”

Luna waved her forelegs in the air dramatically. “Yes, the Cock of the Night!” She pushed her hips forward. Her flare bumped Celestia’s lips. The older sister groaned and opened her mouth wide, letting it slip into her warm, damp mouth. Her tongue moved against the flare. Luna balanced herself on the headboard, luxuriating in the pleasures of her sister’s mouth, letting Celestia get used to the feeling of worshiping a dick again after so many centuries. She couldn’t help but admire her own cock — mottled black and indigo, gleaming in the dim light of the room’s gas lights. The veins pulsed ever so slightly beneath the skin. And Celestia — oh, how wonderful her dignified face looked, debased by the black member spreading her lips into a wanton ‘O’. She had hooked her hooves over it, holding the shaft close to her barrel as she sucked.

“Do you like the flavor, sister-whore?” hissed Luna, grinning lecherously.

“Mmm hmmm!” Celestia nodded, eyes looking up at her, sweet and saucy, as she sucked.

Luna grinned a grin that would have done Nightmare Moon proud. “Would you like to choke on it?”

Celestia hesitated, then nodded again, eyes pleading.

Luna began to thrust her hips, lean muscle working beneath her inky coat. Her cock began to piston in and out of her sister’s mouth. The part that had been inside of her emerged gleaming with spit. She went slowly at first, then thrust deep, all at once, making her sister gurgle and thrash. She laid into Celestia’s mouth, making the bed creak with the force of her thrusts. She could only go so deep with Celestia on her back like this, but the loud choking noises her sister made every time her flare hit the back of her throat were so wonderful she couldn’t bring herself to stop. She went on, thrusting recklessly, until Celestia’s hooves thumped on her belly, pressing her away, begging for mercy. Luna pulled out and looked down at her sister. Celestia was flushed, strings of drool dripping from her lips onto her neck.

“And how was that, sister-whore?” purred Luna.

“It’s what I need. It’s what I deserve,” croaked Celestia. “More. Please.”

Luna chuckled. “You don’t get to decide these things. Lie with your head over the edge of the bed, sister-whore. And take a deep breath.”

Celestia nodded and pushed herself around, matronly belly and teats jiggling, until she was lying across the bed, wings spread, head dangling. Luminous hair floated around her face. Luna wiped her cock on a hoofful of it and straddled her sister pointing backward, with the elder sister’s face between her thighs.

“Open your facecunt for the Cock of the Night!” commanded Luna.

“I think you might be going a little overboard with the dirty talk, little sister,” said Celestia, chuckling and caressing Luna’s dick with her hooves.

“Nonsense! Facecunt! Cock of Darkness! Now!”

Celestia slid her tongue out and drew it slowly around Luna’s soaking wet flare, tasting Luna’s pre and her own spit on it. Luna, in no mood to be teased, grabbed Celestia’s mane with her magic and tugged it hard, dragging her across the bed and ramming her dick into her throat. Wet, soft flesh closed around her, tight and marvelous, contracting whenever her sister swallowed. The mare’s swan-like neck was able to take Luna’s entire length so that soon her balls were pressed against her sister’s nose.

“Mmmmnnnggghm,” moaned Celestia, throat vibrating around Luna’s cock.

“Oh, yes,” said Luna, wrapping her forelegs around Celestia’s thighs. Her hooves slid down those magnificent haunches and pulled her cheeks apart so that she could look at her sister’s juicy pussy lips and fat ponut. “Oh, your pudenda promises such delightful pleasures! I must avail myself of it.” Luna buried her face between plump white thighs, nosing at the fat, sopping wet lips of her sister’s cunt. She inhaled the rich, musty scent. Luna lapped at her teats and at the outer lips of Celestia’s pussy, but she refused to kiss inside. The older princess’ clit twitched, winking her white pussy lips open, but Luna simply ignored it, taking pleasure from her sister and offering none in return. Pleasure glowed throughout Luna’s body, radiating from her brand new cock. She a tightening feeling in her balls, unfamiliar, but she quickly realized what it meant. She pulled back, popping audibly out of her sister’s mouth, gasping, trembling.

“You stopped!” complained Celestia, tugging on Luna’s cock with her hooves and her magic. “Why did you stop?”

“We are in danger of cumming before We have fully satisfied Our lust.”

“Well. We can’t have that. My pussy and my asshole are every bit as hungry as my throat, you’ll find.” She reached down to rub at her juicy cunt with both hooves. “But this needy baby wants all of your cum.”

“Does it, now,” said Luna, getting off the bed and levitating over a jar of sexual lubricant. Her horn flickered as she cast a magic detection spell. “Celestia, you are not under the effect of a birth control spell.”

Celestia’s belabored gasp of surprise did not convey sincerity. “Oh, how silly of me! And I certainly can’t concentrate to remember one now. I haven’t cast one since little Twilight was a teenager, and then only for demonstration purposes.”

Luna sighed internally. She supposed she knew what she was getting into when she developed a penis potion that fired live ammunition, so to speak. She rose up onto the bed again, her cock bobbing over Celestia’s face. She tipped the jar out over it, covering it in clear and glistening goo. Excess dripped out onto Celestia’s face and neck. “You are playing a dangerous game, sister, tempting me so. Please cast the spell.”

Celestia giggled. “No. I will not.”

Luna growled. “I can spend in your throat instead, sister-whore. We believe We would find that quite sufficiently enjoyable.”

Celestia chuckled and rolled over on her front. She stood up on the bed, and pranced in a half circle, tail high and to the side. Luna gulped as her sister’s fat white plot came into view. Sunburst logos wobbled slightly as the flesh beneath them moved, placid but tumultuous, like a massive gelatin dessert. Stately curves arched with mathematical grace from her flanks to her crack, framing that thick-lipped, drooling pussy, and her pert, clean white ponut. Oh, how Luna needed to be inside of her sister! She poured the rest of the jar of lube out over her sister’s backside, making the fur glisten, and scrambled up onto the bed. She wrapped her forelegs around Celestia’s relatively slim belly and jerked her hips forward, aiming for her anus. Anal sex was the only hope for the monarchy. Polluting the bloodline with an incestuous foal… oh, it would be unthinkable!

Luna’s cock sunk into warm, silky, wet flesh. Celestia screamed with delight. That had been… too easy. Luna pulled back and looked down. She’d missed!

“Sister!” said Luna. “You tricked Us!”

“You want it too,” said Celestia, smirking over her shoulder at Luna. “I can tell. A sweet baby pony to cuddle and call your own.”

“We do not!” said Luna. But her hips had a different opinion. They bucked forward, hammering her cock deep into her sister, making those massive, perfect cheeks rebound in epic ripples. Celestia’s pussy felt so good! And it was so deep! Her massive cock felt lost in its loose, sucking depths. It enfolded her like a hot, silky blanket of love, smothering, hugging, pulling her deeper and deeper in.

“Oh, don’t stop!” howled Celestia. “Oh, your cock is pushing on my clit! It feels so good! I’m gonna cum! I’m gonna cum!”

Luna reared back so she could look down her barrel at her sister’s backside. She reached out with her magic, gathering up the cocktail of lube and mare goo dripping from her sister’s pussy and smearing some on her magnificent white ponut. Her indigo glow pulled the rosebud open, showing the pink inside. She could see her cock moving through the thin wall between Celestia’s pussy and her anal cavity. Luna gasped with pleasure. She couldn’t stand it! The view inside of her sister’s ass only heightened her pleasure! She wanted to pull out, to jam her cock up there, but her sister’s pussy felt so good that she couldn’t stop fucking it!

Celestia screamed. Luna cursed herself — she knew her sister loved having her asshole played with! The older, larger mare jerked and bucked, howling with pleasure as she came. Her pussy, seconds ago loose and inviting, clamped down with muscles strengthened by bearing dozens of foals. Luna’s cock, squeezed past endurance, began to spurt.

“No, no, no!” Luna wailed. The mind numbing pleasure that washed through her body mixed with a satisfaction she’d never known — the satisfaction of breeding a mare, filling her with your seed, claiming her by giving her a foal.

NO! Luna willed herself to pull out. Her cock flapped wildly, spraying cum across Celestia’s ass. She grabbed the shaft with her magic and plunged it into Celestia’s ponut, hilting it deep.

“Oh YES!” cried Celestia.

“Celestia, I love you!” screamed Luna, finally letting herself go. Her balls sprayed spurt after spurt of cum deep into her older sister’s guts. Pleasure wracked Luna until she was left shaking, hooves on Celestia’s ass, drooling on the small of her back.

“We did it!” cackled Luna. “We came in your ass! There will be no royal bastards tonight!”

“Oh did you, my dear?” said Celestia, wiggling her ass playfully. “Why don’t you pull out and have a look?”

Luna’s heart sank. She drew back, slowly, so as not to hurt her sister. Inch after inch of limp indigo-and-black horse dick slid out of that beautiful white ponut. The flare popped free, leaving her gaping, letting a trickle of cum roll down her taint to join the flood dripping from her pussy.

“Oh no,” groaned Luna.

“You cum a lot, dearest sister,” said Celestia, flopping on her belly on the bed. “But don’t worry. I’m not in heat. The chances of conception are very slim outside of my cycle.”

“Very slim, but not impossible,” groaned Luna. “Celestia, how could you be so irresponsible?”

Celestia smirked. “Life finds a way, my dear sister. Now. Do you have a dose of that potion for me? I feel that the ass of the night needs a good pounding.”