Conquered By Motherhood

Luna kept one hand under Daybreaker’s chin and one on her shoulder. There wasn’t much point in holding her sister’s hair back; where most ponies had a colorful mane, Daybreaker had a line of perpetual flame. No need to worry about it flopping into the toilet bowl.

As the blazing alicorn knelt retching in front of the toilet, her fiery mane had shrunk to a low, guttering flame - a reflection of the full-body misery she was experiencing. Groaning, she lifted her head and brushed off Luna’s hands. “Nngh,” she mumbled, “whatever happened to ‘our bodies do as we will?’”

Luna patted her bare belly, recalling her own ongoing struggles with morning sickness. A three-month belly wouldn’t normally be as prominent as the ones she and her sister were sporting, but the sheer number of growing goals made the two of them look quite a bit farther along. “Perhaps, Daybreaker, you were… somewhat blinded by ambition?”

Daybreaker made a nauseated sound, purely out of disgust for Luna’s words. “That expression is the product of small minds, sister. Do not let this trial sap you of pride and passion!” She grasped the toilet bowl and attempted to stand, but a fresh wave of physical unease made her think better of it.

“Our ambition is not to blame,” Daybreaker said. “If that fool Celestia had not vetoed it, I would have strengthened our celestial link and drawn a limitless bounty of sustenance from the sun. Were this body stronger, nourishing Twilight’s foals would not be so taxing.”

Luna smirked. “Celestia, that fool. I can’t imagine why she’d object to radically changing how her body works in the midst of a pregnancy.”

“Sister,” groaned Daybreaker, “your sarcasm, as ever, is…”

Daybreaker froze fearfully - then she lurched forward, retching over the toilet bowl once again.

The sound of creaking bedsprings made Celestia pause as she passed the door to Luna’s bedchamber. Odd, she thought - Luna’s bed was exceedingly luxurious. It would take a hell of a lot of weight to make the springs creak like that. Just what was going on in there?

The lock on the door was magically and mechanically complex, but Celestia had ample experience unlocking it. With a quick flash from her horn, she opened the door and leaned her head into the noisy bedroom.

The scene within did not disappoint. It was not Luna on the bed, but Nightmare Moon - a larger, beefier version of Celestia’s sister. That certainly explained the overburdened bedsprings. And the cause of the rhythmic creaking was also readily apparent: Nightmare Moon had the fingers of both hands deep in her pussy, thrusting forcefully in her marehood. She was throwing her whole body into the act of masturbation, in fact; with each motion of her hands, she threw back her shoulders, thrust her hips, and kicked her legs. Her body language and flushed face spoke of frustration, and the sweat on her brow told Celestia that Nightmare Moon had been at this for quite some time.

Nightmare Moon saw Celestia enter the bedroom, but she barely acknowledged it; even in their normal forms the royal sisters were quite comfortable with each other, and Nightmare Moon was even less concerned with modesty and personal boundaries.

“Greetings, conqueror,” said Celestia, smirking at Nightmare Moon and giving her a casual wave. “Don’t tell me it’s your own marehood that has you so thoroughly vexed.”

“I have been at this for the better part of an hour,” grumbled Nightmare Moon, “and I am growing no closer to release. Even the basest of beasts… surely… is not shouldered with such intense heat.”

“I have heard of this,” said Celestia, taking a seat on the edge of the bed. “For some, pregnancy results in a flood of hormones. More intense than puberty, they say. And with your powerful body and tremendous pregnancy, it seems it may be hitting you harder than most…”

“I have no appetite for your pity, Celestia,” said Nightmare Moon. “Will you not help me?”

“Help you?” asked Celestia. “Twilight Sparkle may have awoken numerous kinks in me, sister, but incest is not among them.”

Nightmare Moon groaned, shifting one sipping hand to her bosom in the hopes of stimulating her fat, dark nipples. “Do not jest with me, sister,” she grunted. “Simply fetch me Twilight. She is the only one who can sate this beastly need.”

“Twilight is too busy to attend to you, I’m afraid,” said Celestia, leaning back on the bed to give Nightmare Moon’s flank a gentle pat. “As you know quite well, our pregnancies render us unfit for duties that call for great exertion or significant risk. Twilight is the only one qualified to take over in our stead, naturally. And a mare spread so thin - even one as brilliantly capable as Twilight Sparkle - cannot spare the time to help you with something you should be able to do yourself.”

Celestia paused thoughtfully, unable to resist the urge to toy with her sister’s Amazonian alter ego. ”Of course, the situation would not be nearly so dire if someone had not had the ingenious idea to multiply her pregnancy…”

Nightmare Moon snarled, her frustration only growing. “Then fetch me a courtesan!” she bellowed.

Celestia shook her head. “It has been three centuries since we have budgeted for royal courtesans, sister dear. We could look into hiring the services of a qualified individual, but I doubt we could get them here in a timely fashion…” She twirled a loop of her swirling hair around her finger. “Oh, but I do have something that would help. Wait here, I’ll be back shortly.”

Nightmare Moon gave a grunt of acknowledgement as Celestia left the room. With her sister no longer providing a distraction, she rededicated both hands to the stimulation of her marehood - and magical darkness engulfed her horn as she created a set of magical fingers to aid her hands. Moaning, sweating, tormenting the bedsprings with her massive bouncing body, Nightmare Moon began to sense the smallest bit of progress. She was inching towards the release that would free her from this intolerable heat…

Celestia burst back into the room and tossed a long rectangular box in Nightmare Moon’s direction. Once the package had bounced off her ass and settled on the bedsheets, Nightmare Moon picked it up and removed the top, peering skeptically at its contents. “What is this?” she demanded.

Celestia was a bit taken aback, having not anticipated any confusion on Nightmare Moon’s part - but she opted to give a straightforward answer. “It’s a dildo, sister. You use it for-“

“I know what a dildo is, Celestia!” barked Nightmare Moon. “I am Nightmare Moon, sister! Empress of the Stars, Mistress of the Dark! This lump of rubber is beneath my dignity.” She pointed the thick black dildo accusingly at Celestia, but its wobbling robbed her gesture of its intended gravity.

Celestia shrugged and rose from the bed. “I’m afraid that is all I can offer you, sister - and if I were you, I would avail myself of the tools at hand. Now if you’ll excuse me, I’m off to check on Twilight, who’s holding the royal court. Ta.”

Nightmare Moon snarled at the closing door as Celestia departed. “Sometimes, dear sister, I dearly miss the days when you were afraid of me.”

And then, sighing, she slid the head of the dildo into her marehood. It was long, thick, and firm - and with a bit of imagination, it was a little like having Twilight Sparkle’s cock filling her cunt. Yes, she supposed this would do.

“Ohh… this is misery,” moaned Daybreaker, rolling onto her side so that her chest faced the rapidly rotating fan. A shiver went through her godlike physique as the air cooled the sweat coating her breasts and her abs - but once the shiver passed, Daybreaker was once again moaning at the oppressive heat. She peeled a damp towel from her forehead and tried to dry her chest with it, but it was too saturated with sweat to serve any purpose. It was soaked - just like Daybreaker herself, just like the rumpled sheets beneath her body.

“Twilight,” she groaned, rolling onto her back and propping herself on her elbows so that she could see past her five-month belly. “This is… amusingly enough… the first time I have ever felt like I was on fire.”

“That is funny,” agreed Twilight. She worked her thumbs into the sole of Daybreaker’s right foot, tenderly massaging the sore appendage. With her head, she gestured toward the tall pitcher of water on the bedside table. “Drink!” she said. “You’re sweating nonstop, and you need to replenish yourself… or maybe try and extinguish your mane, if you think that’ll help more.”

“No, my beloved,” said Daybreaker, lazily brushing a hand through her burning mane. “I am afraid this thing never goes out. Usually I am quite proud of it, Twilight, but right now… oh, it feels horrid.”

Lying motionless, Daybreaker levitated the entire pitcher to her mouth and poured an overflowing mouthful past her lips. After swallowing lustily and gasping for breath, she met Twilight’s eyes again.

“So this is what mortal ponies feel each summer,” said Daybreaker. “I am surprised there is not an annual rebellion.”

Twilight smiled, relieved that Daybreaker still had her sense of humor. Her fingers massaged the ball of Daybreaker’s foot, and the fiery alicorn moaned in pleasure.

“Indignity upon indignity,” sighed Nightmare Moon, holding her arms awkwardly over her head as she awaited Twilight. Her body was bare, because clothing was unbearable at the moment - but it was nearly as unbearable to look down at herself and see the hives covering every inch of her skin. She struggled to remain perfectly still, resisting the urge to scratch her immense eight-month belly.

Even Nightmare Moon had to admit that her gravid belly was unreasonably huge. The heavy, kicking litter of foals inside her - the litter she’d schemed to achieve - was a wide, weighty burden that dwarfed the pregnancy of any mare who had come before her. It was doubly absurd on Luna, who couldn’t even get her arms around it - but even her taller, beefier alter ego could barely manage to lug the massive baby bump around.

Nightmare Moon breathed a small sigh of relief when she saw Twilight enter the bathroom, holding a sealed clay pot in her hands. “This is as much anti-itch cream as Zecora could provide on short notice. I’ve asked her to make more in case the symptoms return…” she popped the lid off the jar and set it down on a countertop, using two fingers to scoop up a thick glob of the medicinal cream. “...but if I know Zecora, this should fix you right up.”

“I hope you are right, my love” said Nightmare Moon. “I like to think that my graceful and powerful body is pleasing to your eyes… but with my skin covered in head awful itching hives, even I can barely stand to look at myself.”

“You’re still beautiful, Nightmare Moon,” said Twilight, spreading the cream on a spot just above the alicorn’s belly button. “The same dark and alluring conqueror as always. And this belly of yours…” she ran her hand over the curve of Nightmare Moon’s tummy, spreading the soothing cream over its surface. “I think I’m going to miss this when it’s gone. The hives… not so much.”

Nightmare Moon could only sigh with relief as Twilight’s hands - and the medicinal cream they were spreading - worked their magic.

Three doctors and a half-dozen nurses kept their distance as Twilight Sparkle focused her magic, building a pair of glimmering lavender auras around the beds that Daybreaker and Nightmare Moon occupied. The hospital’s staff had prepared admirably for this day; they knew to expect the imposing alter egos of the royal sisters, who were larger and more willful than the princesses they were familiar with. What they hadn’t anticipated was just how violently they would thrash when contractions hit. The two other beds nearby, bent and broken, were a testament to that.

The Canterlot hospital didn’t have the sort of heavy-duty, reinforced beds it would take to withstand that sort of punishment. No such beds existed, as far as anyone in Equestria knew, because no pony had ever had need of one. There were alternatives, though - and Twilight, fortunately, knew a variety of useful spells that the medical staff didn’t.

The enchantment she was casting now was a reinforcement spell, a complex and powerful magic that increased the durability of its target without impeding its function. The magic was only as strong as the unicorn creating it - but in Twilight’s case, that wasn’t a problem. The beds were steady as a rock once the spell was cast, and Twilight gestured for the doctors to return to their work - but she stayed where she was, kneeling between the beds, using all her focus to maintain the enchantment. The strain was already getting to her, creating an ache at the base of her horn… but Twilight didn’t mind. Seeing what her wives were going through, she knew she had it easier than either of them. And the pain, in a way, made her feel closer to them.

With their beds reinforced, Daybreaker and Nightmare Moon were better able to steady themselves. Without fear of shattering the bedframe, they wrapped their fingers around the handles on either side and braced their feet in the stirrups, giving the doctors room to work.

Daybreaker grit her teeth, suddenly seeming not just pained but annoyed - and despite the relative silence in the room, she abruptly snapped at someone. “Your color commentary is neither desired nor needed, Celestia. Shut up."

Twilight bit her lower lip, failing to hide the grin that grew on her face. “Now, now, my wives,” she chuckled, “play nice, all right? For the foals’ sake.”

Daybreaker laughed ruefully and turned to Twilight with a smile that revealed her sharp white canines. “Be careful, my dear wife,” she muttered, “I cannot silence Celestia with a fist to her jaw, but you? You I can reach.”

A nurse approached Nightmare Moon, wearing the same calming smile she did for all the patients she tended to. She’d seen the alter egos of the princesses at many previous checkups, and she’d learned to think of her less as a mythical figure of ancient evil and more as an expectant mother. “How are you holding up, your majesty?” she asked.

Nightmare Moon lifted her chin haughtily, and an unseen breeze seemed to lift her dark mane. "I am Queen of the Umbra,” she intoned, ”the Terror in the Shadows. I have claimed victory in ten thousand battles. I have been burned by dragon fire, scoured by the acid barbs of the horrors of the deep, and been impaled on claws of pure void. To me, pain like this is a trifle."

The nurse nodded patiently. "So I take it you will pass up the numbing agent, then?"

Nightmare Moon winced and let out a short, nervous laugh. "Well… Let us not be too hasty. Even an umbral terror would be wise to avail herself of every advantage… including the miracles of modern medicine.”

With the beds reinforced and the numbing agent administered, the delivery became something almost normal. The staff was prepared for every complication known to medical science and magical study - and they’d accepted, somewhat grudgingly, Twilight Sparkle’s input on the unheard-of complications that could occur in this unprecedented situation.

But now, on the day of the delivery, there was no occurrence so momentous as what Twilight’s anxious mind had conjured up. It was no cakewalk either; no mare had ever delivered nine foals at once, and no hospital had ever cared for two such mares simultaneously.

Throughout the last nine months, Daybreaker and Nightmare Moon had been humbled by the trials of pregnancy; even with their immense power and godlike physiques, they were mares. They weren’t above the pain of labor, nor the fear of what could go wrong. They were helpless in this moment; the safe delivery of their foals was in the hands of the doctors and nurses that surrounded them. All they could do was endure, and push.

And in time, the first of the foals began to crown. The sisters were nearly in sync, either through magic or mere coincidence, and the first pair of babies were in the hands of nurses at practically the same moment. Two little alicorn girls, which was just what their mothers were expecting; it had been difficult to get a clear picture of such a crowded pair of bellies, but the doctors’ best guess had been that all eighteen of the babies were alicorn girls. And the babies proved them right, one by one, as Daybreaker and Nightmare Moon grit their teeth and pushed.

And they probably would have kept pushing long after all their foals were delivered, had Twilight placed a hand on each of their shoulders and told them it was over. But before the new mothers could even smile, their brows furrowed in concentration.

It was a moment before Twilight noticed, though; she was wiping sweat from her brow and massaging the base of her aching horn. “Eighteen alicorn babies,” she sighed. “Well, thanks to Flurry Heart and Sunburst, we know a thing or two about what to expect and how to deal with it. For now, we, uh…” she looked to her left and right, and saw the knitted brows on the sisters’ faces. “Are you two all right?” she asked.

The sisters turned to Twilight and spoke simultaneously.

“Luna and I-“ said Nightmare Moon.

“Celestia and I-“ said Daybreaker.

The sisters paused and looked at each other. Their weary eyes met, and Daybreaker nodded silently.

“I was having an internal debate with Luna,” said Nightmare Moon, “and Daybreaker with Celestia, it would seem… about which of us gets to hold the babies first.”

“Oh,” said Twilight. “Do you need my help deciding? I could just flip a coin, if that’d make things easier.”

Daybreaker raised a hand to silence Twilight. “Very kind of you, Twilight, but we and our other halves are big girls. We will work it out ourselves.”

There was a silent moment as the alicorns spoke with their other halves. They nodded and began to shrink, much like they did when they transformed back into Luna and Celestia: their height and muscle mass diminished gradually, and their manes faded into the familiar hues of the royal sisters of the sun and moon.

But the transformation halted midway, leaving them not quite in one state or the other. They stood taller than the princesses ordinarily did, with thicker thighs and more powerful arms. The princess of the day still had a mane of raging flames, but it burned in the colors of Celestia’s mane. The princess of the night was a darker shade of blue than Luna, but not the inky black of Nightmare Moon’s cost. And both mares had mismatched eyes - one round, one slitted.

The transformation ended just in time for the royal sisters to see the nurses return to the room, wheeling in carts that held their freshly washed newborns. They were healthy, and strong, and beautiful, the doctors told them, as if the three royal parents couldn’t see that for themselves. The royal sisters, their bodies still hybrids between their multiple selves, stretched their arms out to receive their foals as the nurses placed them in their arms one by one. And Twilight Sparkle held her breath, tears welling in her eyes as she watched her wives smiling down at each tiny bundle. There were so many new little ponies in her family, but she was already in love with every one of them.