A Prank A Millennium In The Making
"O–ho... Starlight, I'm not sure that was the right... Urg... Mixture," Twilight Sparkle, alicorn princess of friendship groaned as she clenched her aching stomach.
Forced to sit back as a great weight shifted between her legs, the royal mare grit her teeth, eyes closed tightly as her twisting gut gurgled and gargled. The potion she and her former student had concocted had tasted like strawberries, simply enough it had slid down her throat and into her belly without harm. Sitting there for a good few minutes the love juice had given her a pleasurably warm sensation in her abdomen and a particularly sensational tingling under her tail. She'd been wet in only a few moments, ready to have a whole night of romping fun.
The novelty had soon worn off, however. It had started with a feeling akin to a small knot tying in her gut, then that ball had dropped back to between her hips. Her belly had grumbled up a storm and she'd burped, moments before the small knot grew to the size of an apple. Then a watermelon, and right now she was looking down in horror as her belly swelled bigger and bigger. Her taught skin stretched, and a bubbling sensation like that of fluid filling her bulging womb caused her to reel in both pain and pleasure. As the mass became the size of a barrel, the pool of gathering arousal under her tail spilled out over the crystal floor and she called out in ecstasy.
"By Celestia, Twilight... I..." Starlight Glimmer stammered as she watched her old mentor's belly grow from that of a full term pregnant mare to something even larger.
It barely even looked as if Twilight could walk with a bulge that large, and as Starlight looked at the dripping rim of the empty potion she'd just downed, she shivered in anticipation. It slithered down her throat like hot cum, the sweet nectar of a stallion's seed contained in a vibrant pink bottle. She felt the spark of warmness in her gut and trembled, even more, tail swishing as her pussy began to itch. The effect was amplified by an estrus spell she'd cast only seconds prior, sending her into a temporary heat.
Twilight finally took a breath, the hot pool of sticky fluid under her butt proof enough that the experience had been orgasmically blissful enough. Tail dripping, the alicorn heaved herself up and looked back over her shoulder at her huge, pregnant belly. Starlight's breath caught in her throat as she felt the same knot tie in her abdomen, the burning sensation of her new heat growing with it. Meanwhile, Twilight felt something move playfully in her newly gargantuan uterus. Reaching a hoof around to rub the gurgling mass, the alicorn felt a small kick press back against her. It was also clear that whatever it was, was not soft body fat. Her womb was taught and firm, almost like it could be burst by a needle. The princess looked far more on edge, her tail subconsciously raised as she glanced at Starlight.
"I thought it was supposed to be a mock pregnancy potion, not a liquefied life spell!" Twilight exclaimed, almost wobbling to the floor as her new weight swayed.
Starlight took a step back, her marehood pulsating, gushing like a waterfall as her flanks rubbed together. "I–I... I thought it was, it said it right... Arrrg!" Starlight's internal knot dove towards her uterus and just light Twilight's it swiftly began to expand as she pressed a hoof to her aching midsection.
Starting as something comparable to an orange, the bump in her belly started to swell, gurgling and bubbling as it did so. Planting all four hooves, Starlight grit her teeth, standing firm as the pain and pleasure pulsated through her in great, tingling waves. Her belly became a little pudgy at first but soon swelled larger and larger. It kicked and squirmed, groaning until, almost barrel sized, it bulged against the confines of her inner thighs, and her teats swelled below her throbbing marehood. The piling weight dragged her down as more of the vicious fluid became solidified into a taut, trembling mass.
"Oooo, my goodness, this is soooo, good... Tight... Arrrg!" Starlight panted, looking back and rubbing her expanding belly as it swelled.
Unlike Twilight's however, the mass stopped growing far sooner. Starlight looked only just about ready to give birth naturally, whereas Twilight's belly was almost brushing the floor.
"What... No... Please don't stop... I..." Starlight complained, looking over at the far more gravid Twilight, pouting.
The alicorn smirked. "Looks like I did drink the most after all," she boasted, crossing a hoof over her chest as she wobbled her belly. "Now, do you want to get down to tonight's plans before this wears off or..."
Twilight's words were abruptly interrupted by a sudden and painful contortion around her giant womb. “W-what? Wait, this isn't supposed to so re– nngh!” her limbs gave out, suspended only by her massive belly as her face scrunched in agony.
"Twilight, what's wrong, are you alright?" Starlight asked, heaving herself over to rub her former mentor's shoulder
Uttering out a low whine, Twilight looked back at her squirming belly. The smooth surface squished and squeezed, changing into all sorts of taught shapes as the amniotic sack within was pressured. Twilight motioned back to her rear end and Starlight shuffled her great mass to see the mare's wide hips and quivering pussy under her raised tail.
"Twilight, is it just me or as your butt gotten so much bigger?" Starlight asked, grasping Twilight's wide plot between her forehooves and rubbing her flanks.
"Gurrr! By Celestia... Starlight... Just lick it, rub it, do something... It feels like I'm dying over here!" Twilight growled, but just as soon as Starlight went to pleasure her as they'd planned, the contorting pain ceased.
Twilight let out a shallow gasp, relaxing slightly even as her belly remained firm as a rock. Starlight's head rose from between the mounds of her bulbous butt, her muzzle only a little wet.
"You okay for hot pregnant sex now?" she asked with lidded eyes. "That first spell feels like it set my rear-end on fire."
"Yeah... I... I don't know what happened to me. Must have been another growth sprit or..." A popping sensation cut Twilight off again, and a rush of water flooding through her birth canal blasted right into Starlight's face.
The lilac unicorn observed as a flow far more intense then a simple orgasm gushed out of her former mentor's dark virginal lips like a river, before splashing into the wet pool of arousal below her. Wiping her face free of the hot fluid, Starlight stared through the drooping strands of her wet mane at the princess. Twilight's eyes were as wide as full moons.
"S–Starlight... I–I think that potion may have been way too... Arrrg!" Her womb contracted once again.
Tears rolled from her eyes as she leaned forward, tail raised and butt thrust up into Starlight's face. The unicorn sat back, her own monstrous belly taught and wobbling as it gurgled happily. Starlight rested a hoof on her bulging foal factory as Twilight uttered another groan through gritted teeth.
"What do you mean? You can't really be in labor, right? I took the same potion and I'm nowhere near as big as you!" Starlight examined, rubbing her belly.
"I said it myself, you... Oooof, took less then meee... Arrrg!" Twilight retorted, contractions visible as pulsating ripples across her massive belly.
She was feeling urges she'd never felt before. They were so strong it was as if she couldn't think. Every aching fiber of her swollen body was demanding she steady herself, bear down on her strained abdominal muscles, and push as hard as she could.
"Nuug... Starlight... We... Arrrg, I'm not ready to be a mother!" Twilight screamed as another contraction forced her belly into a hard oval shape.
Starlight recoiled, still rubbing her own belly as she looked around desperately. Spying the magenta covered book the pair of them had pulled the recipe from, she wobbled over to their alchemy desk. The hard kicking within her own swollen womb caused her to wince, and she almost staggered as a firm limb prodded against her uterus's inner wall, sliding its way down before tickling her belly button. A sharp gasp escaped the unicorn as she fell forward against the desk, nethers buzzing with a wet pleasure as the squirming mass within her continued to pulse.
"And to think I was jealous you got a whole mouthful more," she moaned, unable to resist the overwhelming urge to slump with her back to the desk and rub her aching marehood as fluids trickled forth.
It was pretty clear that the fertility brew may not have been the only thing that was too potent, as Starlight's self-imposed estrus refused to give her the satisfaction of orgasm just yet.
"Naaa! Starlight stop doing that without me! Now... Grrrg, get the book... T–there, arrg, has to be a counterspell to its effects!" Twilight demanded, pushing herself back towards the foot of her bed and propping herself up with an elbow.
The weight of her new belly forced her already wider hips apart as it rested down upon them, and another contraction sent a jet of amniotic juices all over the covers. Twilight grit her teeth once more, a new wave of tears rolling down her cheeks as she was forced to push against the alien body within her. Seconds later, and she gasped, yet nature wasn't about to give her much of a reprieve and she grasped the base of her drooping belly as another contraction rippled through her.
"Arrr! Starlight, hurry, I don't know how long I can hold this!" Twilight begged as the stretching sensation of her cervix peeling apart began. Straining around her belly, the princess crossed her rear legs in a futile effort to forgo having the baby.
Her own belly heaving as her own baby squirmed, Starlight levitated over the alchemy book. Its cover was a deep purple, rings of ancient arcane runes marked in deep black on its demonic looking cover. Biting her bottom lip, she swiftly flittered through the pages.
"Let's see, unlimited self-pleasure spells, instant sex slave, sprit tided ecstasy... Unlimited orgy fusion spell?" Starlight's eyes flickered across the demonic runes until she finally came upon what she'd been looking for. "Here, instant, full-term pregnancy potion!" she called, jabbing a hoof at the page.
"Okay, hurry. Find a counterspell or recipe... Nruug... P–please hurry!" Twilight begged, contorting in pain as she slipped to the floor and pressed both forehooves to her widening pussy.
Starlight grimaced as a heavy kick shuddered against her gut. "Okay, let's see. A potion designed to replicate all the effects of a full term pregnancy for a limited time, for those who wish to add a little weight to their experiences." Starlight rubbed her squirming belly as she read on. "Effects should last no longer than twelve hours. Please note; that this fetus is not actually real, couples wishing to have an actual foal will have to find other means."
"W–what... So where's the counter... Arrr, this foal's pretty real, Starlight!" Twilight cried, forehooves trying to force the foreign body back into her as it slithered its way downwards. "I... I can't be a mother yet!"
Starlight looked down at her own belly apprehensively as another shudder ran through the only slightly smaller mass. "You're not ready? How about me? How long have I got to wait before I'm delivering just like you?"
The deadly look Twilight shot her former student in that brief moment her face was not contorted in agony told Starlight that right now, the princess could not care less.
"How about you complain... Nuggg... About that when there's a whole class of foals trying to crawl out of your birth canal, Starlight!" she screamed, unable to stop the urge to bite back the pain and push as hard as she could. There was a writhing sensation between her flanks and something slick tickled at the inside of her pussy, and she groaned. "Starlight... Look on my shelf, Cadence gave me a foaling book a few years ago... Please get it," the princess panted.
Nodding, Starlight heaved her own bloated form over to the shelves and began to telekinetically rummage through the books. Suddenly there was a sharp cramp in her gut, and she yelped, clutching her massive belly as books thudded down around her. Swallowing, she looked down at the taught fur of her perturbing belly as the great mass slouched. Meanwhile, Twilight howled in pain as more fluids were forced from her contorting birth canal.
"Okay, come on, Starlight. You've seen a foal delivered before, how hard can it be?" the unicorn muttered to herself, one ominous kick within her and she choked however.
Taking a sharp breath, and brushing her sweaty mane from her forehead, Starlight stretched up as far as her bulbous form would allow. The weight of her monstrous belly sank down, dropping between her hips like an anchor as it gurgled. A few books, howls from Twilight, and internal cramps later, and she came upon a bright pink book labeled 'Natural Foaling For First timers'
"As if this isn't a suggestive gift from your sister in law?" Starlight mumbled to herself, even as a surge of motion in her belly made her really glad for the book. "Okay, okay, I got it," Starlight proclaimed, wobbling back over and slumping down next to Twilight.
"Thanks, Starlight... I'll be sure to make this up to you when... Arrg!" Twilight's face went red as she doubled over, all hooves pressed against her firm belly.
Starlight reached out and began to rub the writhing mass with a forehoof as Twilight panted and opened the foaling book. Twilight's bump was so smooth, so taught and big. Starlight could not resist scooting as close to it as she could until their bellies met. Their foals kicked against one another, and both mares moaned in brief ecstasy as Starlight caressed along Twilight's squirming bulge, her marehood growing wetter.
"You know, it's not that bad... You look so much more sexy like this, Twilight," Starlight hummed, eyes lidded as her tongue did loops over Twilight's outward sticking belly button, and she spanked the mare's flanks.
Her belly went taught once again, and Twilight grunted as another contraction drove her foal closer to being born. First nibbling at Twilight's navel, Starlight eventually slid her head down toward the mare's newly enlarged teats and nethers. Unable to read her book properly, Twilight forgot all about the next contraction as Starlight orally massaged her leaking teats before the expert found her way down to her clit. She reached out, trying to hold her foal in again if only to spend just a little longer like this. As if offended by their efforts to slow what was inevitable, however, her belly gave a firm shudder, blasting Starlight's face with more fluids as a hard contraction shoved Twilight's foal further downwards. A hard mass parted her pussy, shimmering as it shoved her lips apart.
Appearing from below her former mentor's huge belly, Starlight gave a sultry smile, eyes lidded as she purred. "How about we just go through with it? We could at least make it an orgasmic birth?" the unicorn mused.
Twilight grit her teeth, trembling. "B–but... It's not right, that potion wasn't, nruug, supposed to do this," Twilight grunted, words perforated by winces and groans as the gurgling in her belly grew. "I–I, I need to know why it's so... So wrong," she panted.
Starlight rubbed her own belly again, knowing full well that the same thing could happen to her at any moment. Her foal was still big, and could always choose to enter the world whenever it wanted, not that, like Twilight had said, it should be able to. The spell in the book was wrong, this should have just been a good night of safe, mock pregnancy sex. Something to add to their long list of naughty taboo fun times. Starlight's estrus spell had gone off without a hitch, so why were they now both about to give birth to real foals? Right about then, however, there was a whoosh in the air, papers and scrolls flittered widely as all of a sudden a bright blue flash illuminated the middle of the crystal castle bedchamber.
"Ha! I can't believe you actually found that recipe after all this time, Tia! Sorry I'm late I..." Contractions or not, each mare looked up with wide eyes at the gleaming midnight blue alicorn that had just giddily materialized in the middle of the room.
Princess Luna's face was similarly shocked as she regarded the pregnant pair before her, then the pools of liquid dribbled across the floor. Her flared wings drooped and her mouth hung open as she fell back to all four hooves. "Twilight Sparkle? Wait, you're not my sister." Luna waved a hoof at the princess' bulging belly. " And it would seem you have a rather large problem too. As do you, Starlight Glimmer." She nodded at the lilac mare as Twilight howled in pain.
Nevertheless, the presence of princess Luna did at least soften the sensation as she screamed. "Really, you don't say!"
Wincing at another kick to her sensitive insides, Starlight shifted towards the new alicorn. "Erm, well, you see, we might have taken a potion that didn't quite work and... Wait? What did you say about a recipe?" she asked.
"This wouldn't happen to be a potion you found in Canterlot, pray tell?" Luna questioned, arrogant of Starlight's sudden question.
The heavily pregnant unicorn shrugged, before Twilight fought to answer through her painful exertions. "N-no... I found it in arrrg! Your old castle a few years ago, nuuurg!"
Luna stomped a hoof on the floor, grumbling to herself. "You didn't even take it with you after banishing me, Tia. And you say you love me."
Twilight let out another fit of painful cries, the parting of her pussy visible between her splayed legs as she pushed harder and harder. "Can you two s–stop chatting and... Arrg! Help me!"
"Wait, what do you mean? What's going on?" Starlight pressed and Luna lifted her head to glower down at the two mares.
"Didn't your mother ever teach you to keep out of other ponies things?" she asked, then rolled her eyes before elaborating. "It seems you two have stumbled on one of the old jinx traps I set for my sister. Particularly one intended for one of her old fertility gatherings. I was going to give all those tight tailed nobles quite the time. Not that I expect my sister would have protested when she found out, she's into a lot more them most ponies know." Luna smirked, and Twilight growled.
"You booby-trapped the recipe!" Luna nodded, flexing her wings graciously.
"Well, technically it's a jinx or a hex. I was quite good at those in my youth, just ask my sister," the nightly mare giggled, hoof pressed to her muzzle. "I had it set up to tell me whenever somepony set it off too, and you two seem to be the lucky mares."
"Is it reversible? Please, I don't think we're ready for foals!" Starlight pleaded, tugging on ethereal Luna's mane as her own belly cramped yet again.
Luna laughed. "Foals? Don't be ridiculous, do you really think I could have left my sister with such a responsibility? No, I designed the experience to be far more entertaining."
Starlight's blood ran cold as she rubbed her churning belly, her face pale. "So... so... what's?" She looked down at the bulging mass between her legs.
"Luna... What in Equestria did you put inside us? Arrrrg!" Twilight interjected, throwing the foaling book away as her legs were forced completely apart and something popped from the wide folds of her strained pussy.
Luna giggled to herself, appearing very entertained. "Well, I think you're about to show us, Twilight. Oh, it's so good to know this still works. Tia is going to want to use it so much now!"
The paleness in Starlight's face was doubled a she looked back at the squirming Twilight. Her head tossed back, eyes closed and grit teeth flashing, the princess of friendship was unable to see the mound of rolling tentacles that forced their way from her virginal lips. Starlight felt a firm shuddering in her belly, the sensation now far more akin to a ball of snakes then it had been a few minutes ago. She ran a hoof along her own squirming mass as the tentacles slithered out from Twilight's pussy and reached around her rear legs. Others reached up to steadily rub her pudgy flanks and large belly.
"W–what... What is this? I..." Twilight stammered, pain still evident on her sweaty face as she looked over her belly at the slithering limbs. "Luna what did you do?" she panted.
Luna shrugged. "Haven't you heard about a daemon of fertility before? It's quite a simple thing to bind to a hex. I'm shocked Celestia never taught you about them, given how much she's into pregnant mares," she responded, licking her lips at the sight. "Give it a moment and you'll see why it's worth the pain."
"I... I... Why would your sister teach me something like this?" Twilight mumbled as one of the tentacles wormed over her belly and booped her muzzle.
Twilight blinked, wide-eyed. As if that was some kind of permission, the limb retracted to the coil of tendrils around her rear-end. The slimy snakes massaged her inner thighs, wide flanks, and lower belly lovingly before another set went to work slowly rubbing the outermost lips of her pussy.
Twilight moaned, the subtle pain overcome by pleasure. Luna smiled, clopping her forehooves together and giggling like an eager foal as she wrapped a wing around Starlight. "The spell only lasts a few hours. Go try some with your lover before it's your turn," Luna suggested with a wink, before poking the unicorn's bulbous belly. "Of course, it looks like you'll be fit to burst anytime soon too."
Starlight gulped, the sensation of Luna's soft feathers against her back and the feeling of her hoof as it rubbed her taught belly turning her from anxiety to full arousal. Twilight had gone from pain to bliss in the blink of an eye too, and as horny as she was, Starlight could not resist having the hot pregnant sex she'd intended on having any longer. She threw herself forwarded as fast as her oversized belly would allow, wrapping all of her hooves around Twilight's distended womb.
Finding the mare's belly button yet again, the lilac unicorn rubbed and kissed her former mentor's taught skin over and over, letting her forehooves fall to stimulate the edges of Twilight's wide pussy along with the tentacles. What efforts her former student went to, however, were nothing compared to the ecstasy Twilight gained from the slippery tendrils. They stimulated every nerve below her waist, rubbing her legs, drawing loops around her aching teats and danced circles around the rim of her pussy before pulling her lips apart and coiling back on themselves. The invasive daemon forced its way back into Twilight's body, rubbing at her labia as it squirmed and filled her pussy with yet more soothing fluids. Starlight too pressed up and down on the edges of her mentor's marehood, causing the liquid to squirt out over her own belly and swollen teats.
Starlight groaned as some of the tentacles began to slip around her own rear legs and rub at her belly. The tentacles still trapped within her bounced giddily as if accepting the familiar presence of Twilight's own mature brood. Infatuated with Twilight's belly, she didn't notice as more tentacles wormed their way up to her pussy and began to rub her too. She felt a hard shudder in her gut and pressed a hoof to her belly as the mass within thrashed.
"Not now... You wait your turn little guy, you can come out soon," she assured her immature daemon.
"Better make it quick, this is amazing!" Twilight sang, then gasped as the tentacles finally found her pleasure button. "Ooo, that's the spot... Starlight, this feels so good!"
Starlight shuddered as her mentor went from relaxed to tense, all the while she could feel the tentacles start to worm their way into her heated pussy. Sleek and wet, they coiled up around her belly, rubbing her swollen womb affectionately. More began to flow between her swollen teats, milking the oversized glands like a milkmare would her cattle. She fell forward, sprawled over Twilight's massive belly as the tentacles all at once surged up into her, as if to retrieve their developing companion from within her womb. They forced her folds apart all at once, shoving her labia aside as they dove into the very depths of her pussy. Just like that the kicking sensation in her belly grew tenfold as the tentacles set to having a party within her taught uterus.
"O-oh... S–Starlight, I... I'm so close!" Twilight moaned as the tentacles pressed, pulled and sucked on her clit, dancing around it with teasing accuracy.
Starlight grit her teeth, a strained breath escaping her as her belly was forced wider and wider. All the while the tentacles soothed her taught skin from the outside and massaged the silken walls of her channel with a lover's caress. The mare heaved, looking up over Twilight's great belly to see her former mentor's face contort, then go slack as a rush of fluids splashed her tail. The lavender alicorn's belly gurgled as she finally climaxed. Seconds later and she was panting, tongue lulling from her muzzle.
"That was really the spot... Wow, Luna, I can see why this is... Ooooh, I'm going again!" Twilight could hardly speak as the orgasms came in waves, each greater than the last as the tentacles jumped up and down on her tingling clit.
Starlight on the other hoof, was being drawn right to the brink of orgasm before the tentacles would withdraw, only to come back moments later and tease her even more. The mare panted, tongue hanging from her muzzle too as she rested her head on Twilight's belly.
"Come on guys, stop pulling out, please..." Starlight's words were cut off by a shrill shriek as the tentacles all dove on her clit, pulling and pushing the little love switch.
Her dark genital lips were yanked apart, allowing cool air to rush into her folds as yet more of the slimy limbs rubbed her labia and plunged deep into her packed womb. Starlight's face contorted, her mussels spasming as she was drawn to the very brink of cumming. The tentacles rubbing her clit paused, soothing the pleasure button with a few flicks and finally driving her over the edge. She gripped Twilight's belly hard, going rigid as the strongest orgasm she'd ever experienced blasted through her nethers. Ripples pulsed through her gravid stomach, threatening to send her into labor right then as wave after wave of orgasmic bliss went on and on. Finally, she heaved, going slack atop Twilight, their two bulging bellies pressed against one another as the tentacle daemons within kicked and squirmed haply.
"Starlight?" Twilight questioned, glazing up at her student as Starlight's drooped over her rounded form. "As much as you might regret having to go through labor soon... It's totally worth it," the princess sighed happily.
Starlight shifted a hoof to rub her full belly, the life within kicking back playfully. "I think I can manage, so long as I get another round like that," she admitted.
Meanwhile, Luna just stood in awe of the two mares, ethereal tailed tucked between her moist thighs as the two ponies reveled in their glorious after aglow. The princess of the night sat down to cover her arousal, humming to herself as she tapped her forehooves together.
"So, I know this might not be a good time to bring this up, but there is always the matter of payment," she stated sharply, and both Starlight and Twilight glanced at her.
"Payment?" the pregnant pair uttered in union, and Luna nodded.
"Well, of course. You can't expect a daemon to do something for you without something in return," she elaborated, and both rounded mares looked at each other, then Twilight groaned as more of the tentacles slipped out of her wide pussy and darted right at Luna.
"W–what is this... I... I'm not involved here!" Luna stammered as the trio of advancing limbs wrapped around her foreleg and pulled her forwards. Trying to tug away, she lit up her horn, only to have another tentacle shoot up and wrap around the tall spire, subduing her magic. "This... I... You can't be serious!" she exclaimed as the tentacles yanked her head down, forcing her to bow as they pulled her towards the two pregnant mares. "I don't want to have to be the benefactor again!" Luna whined.
Tentacles slipping out of her, Starlight rolled off of Twilight. Her plump butt hit the warm pool of their combined arousal as Luna was flipped onto her back and her rear legs were forced apart. Growling about unfair trades and pacts made with goddesses of fertility, Luna was unable to stop her wet marehood from being drawn right up to Twilight's bulging pussy. The princess of friendship sat up best she could, peering over her huge belly at the grumpy alicorn as Luna's rear end was caressed in a similar manner to how hers had been.
"Luna... I... This isn't me... But, oooo, it feels so good," Twilight moaned, making Starlight only a little jealous as she observed the tentacles work their way into Luna's puffy marehood.
"Fear... N–not, Twilight. At least you don't have a debt to this vile daemon. You'd have thought after a t–thousand years one would forget..." Luna's stammering was cut short as the tentacles rubbed the edges of her pussy, tickling the folds gently before slithering their way inside. "I hate it when I end up being the broodmare!" she grunted, yet any expression of dissatisfaction dissolved as she moaned.
The slithering limbs crept down her silken channel, rubbing across each of her sensitive walls generously as they steadily peeled her marehood apart. Slow as they were, the limbs moved with a purpose, forcing their way past her cervix and deep into her empty womb. Twilight too gasped in awe as they worked their way in and out of her, while doing the same to Luna. One wayward tendril finally came upon Luna's own love button, and the alicorn let out a shrill hum as her clit was nudged playfully.
"Oh, Twilight, you really did drink a lot you n–naughty mare. This one is even bigger than most of my sister's," Luna panted, sweat matting her mane and brow as one tentacle held her head down towards her now pudgy midsection.
"W–well, when you think you taking a whole other brew all together it... It can kinda get complicated," Twilight retorted through her own gasps. "Oooo, they're making me cum again!"
"A petty effort, Twilight. You would lose any endurance race with me in a... A–a heartbeat," Luna grunted as Starlight crossed her forehooves over her gurgling belly and pouted.
The limbs within Luna set to work thumping her clit as they had done the other two mares. Yet unlike with Twilight and Starlight, one large limb wormed its way out of Twilight's pussy and forced its way inside Luna. Regardless of her bold ability to endure for so long, Luna was forced into waves of orgasm just like the others as the large limb pressed itself against her open womb. Luna grunted, biting her lip as the largest tentacle's tip blossomed, blooming into an open orifice that began to pump her full of warm fluid.
"Oh, Tia, If only you had been the one t–to... Ooooo!" Luna cried out as the unique tentacle swelled and squirted out its first egg into her ready womb. "Now I'm going to be the size of a house for months!"
Luna was given only a brief moment to catch her breath, panting like a hot dog. Then came another surge of pleasure as the tendril bulged again, depositing another egg into her rapidly expanding uterus. Like a water balloon, her midsection began to swell, grunting and gargling loudly as egg after egg was forced into her with a fresh flow of fertilizing and incubation fluids. Even more of the hot liquid was dripping from her folds and yet more tentacles emerged from Twilight's pussy to hold the broodmare's virginal lips together. Still feeling left out, and with her estrus still demanding more relief, Starlight took one look at the night princess' rapidly swelling belly and leaped upon it. Nibbling and kissing as she rubbed the dark fur affectionately. Her own belly kicked as she felt the eggs within Luna shift like small beads, as if her baby could once again sense other members of its kind and wanted to play. Luna grimaced, white teeth flashing as her muzzle scrunched and she snorted. Her belly was swiftly reaching the size of Starlight's, and both mares were soon forced apart as their distended abdomens kicked and wriggled between them.
"Ooooo, Luna, your coat is so soft... Soooo, silky," Starlight admired, rubbing one portion of Luna's belly as it bulged, before she spanked the moons upon the princess' bulbous flanks.
"Well, they do say pregnant mares glow," Luna gasped as finally, the flow of eggs seemed to dribble to a halt. The large tendril blasted one last load, a flood that rapidly hardened into a gooey resin to seal the eggs inside their broodmare until hatching. "Urg... Look at me... The masking spells I'm going to need for this are going to be such a pain!"
Luna rested her forehooves on the peak of her massive belly, the taught skin glowing a faint blue as the tentacles retracted from her pussy and slid back into Twilight. The lavender alicorn gasped, lurching at the sensation of the thing recoiling into her belly.
She sat up, resting her forehooves on her own massive belly as she looked to each of the two pregnant mares in turn. "So what now? Are we all having foals or what?"
Starlight shivered, feeling a particularly strong ripple in her gut. Luna, on the other hoof, shook her head. "No, you two should be fine once the effects ware off, a daemon's time is not to be wasted on just one mare, after all." Luna prodded her own belly. "I on the other hoof, have to carry around the thing's offspring until they hatch... Typical." She rested her head on a raised hoof with a huff.
"Awww, you're going to be a mom, congratulations, Luna!" Twilight cheered, but Luna looked about as thrilled as she had been when banished to the moon.
"On the contrary, I'm going to have to carry a brood of Tartarus spawned abominations, then give birth. Hardly a reason to celebrate," she groaned, receiving a jolting kick from her belly as her brood took offense. "Ooof! Hey, a deal is a deal, okay, okay."
"Oh... Hehe, that's great," Twilight admitted sheepishly, then looked at Starlight with lidded eyes. "So you want to rub my belly some more? I didn't know you had such a thing for pregnant mares," she cooed and Starlight choked.
"Pufft, it's a perfectly natural attraction to fertility," Luna offered bluntly as Starlight felt a shudder in her belly.
"Actually I..." Her words were stolen by a searing pain in her gut as she doubled over, hooves pressed against the gurgling bump as she winced.
Twilight paled, and Luna rolled her eyes as Starlight's belly contorted and convulsed, rippling the amniotic sack within until there was a sudden pop and rush of fluids. Starlight's head shot up, ears erect as her waters surged through her still buzzing birth canal. She clutched her belly as it hardened into a taught oval, that urge to push outward with all of her might overcoming her as her wide hips began to part.
"On second... Nruug! Thought. H–how... Arrg! How about we deliver my baby first?" Starlight whimpered, resting back as her rear legs parted and her belly contracted. Twilight took a sharp breath, attempting to wobble over to her bloated former student.
Luna on the other hoof, merely face hoofed. "Mother of you Tia, here we go again!"
********
"So, Luna, what have we learned about messing with ancient arcane monsters of fertility?" Celestia chimed as she telekinetically threw open the curtains of Luna's Canterlot bedchamber.
Princess Luna groaned, pressing a hoof to her wary eyes as she rolled over in an effort to escape the sunlight. Under her stretched covers, her absolutely monolithic belly almost filled her whole bed, rippling and squirming as the entities within drew closer to birth. Unable to move for the offspring of not one, but two fertility demons packed into her crowded womb, Luna pressed a hoof to her mammoth belly and sighed.
"Tia, what time is it? I thought I told you to stay out?" Luna grumbled, shooting a look at her giddy sister as Celestia pranced over.
"What, and miss you like this?" The white alicorn rubbed her sister's belly lovingly. "Hmmm, a joke a millennium in the making. I do regret not being the one to set it off, this does bring back some fond memories," she hummed, nudging her own, far more flat belly with her rear leg.
Unable to stand her sister's beaming expression, Luna levitated a pillow to her face and growled into it. "If only you had been the one. You are the one who should be like this, not me!" she declared and Celestia drew back with a wry smile, patting Luna's belly again.
"You would have liked that wouldn't you, Luna? I have to admit, it has been far too long since I really let myself go. I really should find that book of old-world taboos again." Celestia tapped her chin.
Levitating the cushion away, Luna regarded her sister with one tired eye. " I agree, maybe if you were this big then your royal butt wouldn't look so plump, Tia," she snapped and Celestia frowned.
"You try putting up with all the things I have to and not eat that much cake. Just because you're caring so many babies, does not excuse you from eating the kitchens dry either, Luna!" Celestia retorted swiftly, pressing a hoof to her chest with an indignant snort. "Besides, I would never be so foolish as to enter such an open-ended deal with any kind of daemon," she added, jabbing Luna's massive belly.
The pressure sent a whole new wave of squirming rippling through the night princess' womb, and Luna grimaced. There was a low pressure in her belly, not that she could peer around to reach or even see her throbbing wet marehood.
"Well, let's see you try and take this on then, Tia? When was the last time we made out, hmmm?" Luna protested, pouting.
Celestia appeared to consider that option for a second, then beamed once more down at her very gravid sister. "Well, in a few days we'll have no shortage of baby daemons to make pacts with? I bet I can take more than you when the time comes." She nodded to Luna's swollen mass while patting her own slightly pudgy belly.
Luna's' eyes narrowed as she grinned. "Oh, you're on, Tia I..." Her words were abruptly severed as a huge, pulsating pain surged through her belly and the large mass trembled. Tears seeped from Luna's eyes as a flow far stronger poured from her widening virgina.
Now it was Celestia's turn to grin as her little sister heaved and pushed against the mass writhing within her.
"Challenge expected, Luna. Even better, it doesn't seem like we'll have to wait long to get started at all." The glorious white alicorn giggled to herself whimsically as, through her exertions, Luna fixed her elder sister with one last stare of frustration.
