Those Darn Ponds

by Hypocritical Prude

Rating: mature
Tags: Random, Twilight Sparkle, My Little Pony: Friendship is Magic, Dark, Rainbow Dash, Sex, Rarity
Length: 6748

Twilight, Rarity, and Rainbow Dash. A forest, a pond (that is not the mirror pool), and ponies made of goo. And stuff that no self-respecting person would ever want to read.

Rarity and Rainbow Dash have agreed to help Twilight search for the source of some strange magic in the Whitetail Woods. Maybe they'll find the magic's source. Maybe it'll find them first. Either way, things are getting weird.

This story is mindless clop.

BEWARE, the following story includes: goo ponies, rape, mind-affecting, unbirth, birth, crotchtits, mild breast expansion, lactation, mild weight gain, lots and lots of swollen bellies, and a dash of the just plain strange.

If you don't know if you can stomach that, don't read any further. If you think you can, just remember: this was your call.

And a shout out to callyoops2, whose Mirror Pool Procreation helped inspire this cesspool.

Cover image is fanart by Business Fox. Also, HOLY SHIT someone made fanart! I was not expecting that.

Published 2015-10-07 18:00:01 UTC
Last updated 2015-10-07 18:00:01 UTC

The only chapter

The lavender light of a unicorn's horn shoved futilely against the thick blackness all around, illuminating a small patch of forest and a trio of nonchalant ponies.

"I understand that the Whitetail Woods is not, perhaps, the most grimy place ever." said a well-groomed white unicorn. "Still, I can't help but fear that each step I take will land me knee deep in some forsaken mud puddle. There isn't even any moonlight to see by."

"That was Cloudsdale's mix-up, not ours. We had to put the extra clouds somewhere. Actually, it reminds me of this story I think you'll like." The cyan pegasus speaking grinned maliciously. "It was a dark and stormy ni-"

"Not now, Dash, thank you."

Rainbow Dash sighed, "You know, Rarity, you could just light your own horn."

"Twilight asked me now to, something about it messing with...well with whatever it was we are here for."

Twilight shook her head and tried to ignore their voices. She was pretty sure she had just seen a gleam of something odd in the magically charged light of her horn. She bent down to smell it.

"Twilight, darling, while I am more than happy to help with," Rarity paused at the sight of Twilight, now licking the ground in an attempt to place the not-quite-familiar aura, "I was hoping you could explain, maybe with less arcane concepts, what you wanted us to help you with again."

"Oh, sure. Well, a few days ago, after the running of the leaves, I noticed an odd magical aura around some of the woods. I couldn't find a description of it in any of my books, but it did look like it formed a sort of trail leading into the forest. So today we're following that trail so that I can find out what the source is. I asked you to come because you're a unicorn and I though you could help me track it, turns out that's unnecessary; it's a really obvious trail, and I asked Dash to come in case I needed something I forgot, or to get a bird's eye view in case we got lost."

"Do you think there's some sort of horrific monster causing it?" Dash grinned.

"Um, no. It's ambient magic. Hardly the sort of thing a monster would leave a trail of. Why?"

Rainbow arched an eyebrow and beat her front hooves together.

"Right. Anyway, the path continues this way." Twilight began to trot off, Rarity and Rainbow Dash following.

"Besides," said Rarity, "this is Whitetail Woods. If there were any horrific monsters they would most certainly be in the Everfree. The worst thing we could find in here would be-" *Splash!*

Twilight turned around to see Rainbow already hovering over what looked like a perfectly average puddle, not more than a pony and a half across, sitting in a small clearing. Rarity was nowhere to be seen.

"Twilight! Light, now!" Rainbow called frantically.

Twilight was at the water's edge in a flash, literally. But before she could start to panic, Rarity resurfaced. Rainbow hurried to pull her to the ground.

"Oh, horseapples. This is going to wreak havoc on my mane."

"Is the water cold? Did anypony bring towels?" Twilight asked, perhaps a little frantically, "What about blankets? Can anypony make a fire? What if you start to get hypothermia? How long will it take us to get you to the hospital? What if-"

"Twilight, stop." Rarity held out a hoof to stop Twilight's pacing. When had she started pacing? "I'm fine. The water's actually pretty warm."

But, it's night. And we're approaching winter. Twilight walked over to the pond to inspect it.

"You sure you're alright Rarity?" Dash asked.

"Perfectly well, dear. It actually reminds me a bit of getting a mud bath at the spa."

Focusing on the pond, Twilight could clearly sense the magical residue she had been tracking, now much stronger than before. Perhaps it mixed readily with water. That would explain why it had collected in this pool, but not why the pool was so deep. It would probably be a good idea to get a sample to study, now more than ever, just to make sure it would not have any adverse affects on Rarity.

"Um, Twilight, Rarity's kinda hot."

Twilight snickered. "I didn't know you swung that way, Dash, but can't this wait?"

"What? No! I mean temperature hot! She's feels like she has a fever."

"Oh." Twilight turned around. Dash was holding a hoof to Rarity's forehead, looking concerned. Rarity, however, looked as calm as a cloud on one of the days Dash was off-duty.

"Oh, hello Twilight. I forgot you were here." Rarity said, glancing at Twilight before slowly looking around. "What...*yawn* what are we doing here again?"

Now thoroughly concerned, Twilight started toward the girls, and they started back. Well, jumped in Rainbow's case, wings flaring open. Rarity opened her eyes a bit wider, but seemed to still be processing the thought of escape.

"Twilight, behind y-" *Splat!* And all the world went dark.

It took a moment for Twilight to realise she had not fallen unconscious, had not even been wounded really, and that the darkness was just her horn going out.

Nevertheless, something had hit her from above, and that thing now seemed to have her head pinned to the ground. Whatever it was completely enveloped her horn and pressed against her forehead. It was smooth but firm, and just slightly cool, kind of like an overfull water balloon. It was wet, sticky fluids running from it down Twilight's face. And it squirmed, alternately squeezing her horn and stretching itself against her. It pressed down harder as it spread wide, and Twilight felt a tugging on her horn, pulling her firmly against the hungry hole.

Twilight tried to pull away, but between being pressed to the ground and the suction on her horn her head was thoroughly stuck. Changing tactics, she began to charge a teleport, and suddenly felt a searing headache. Ears ringing, Twilight abandoned the spell to collect her wits. Whatever this thing is, it's full of that magic residue. I can hardly think when trying to cast through that much ambient magic.

Seeming to sense her weakness, the smooth water balloon thrust down on Twilight with sudden force. Twilight tried to scream, but soon found her mouth, as well as the rest of her muzzle, eyes, ears, and head, engulfed in a tight, wet canal. Now truly panicking, she braced her front hooves against the soft mounds she felt around the hold and pushed as hard as she could. Just as she thought she was making progress, the soft mounds buckled beneath her hooves, briefly becoming slick slants that sent her hooves in to join her head before reforming around her forearms, pinning her hooves in the narrow canal.

Oh stars. Oh Celestia. I should have been more prepared. I should have been more careful. I never thought I'd go like this. I don't even know what's got me! I can't hold my breath much longer. I can't cast. I can't pull myself out with my forehooves pinned like this. Where are Rainbow and Rarity? Oh no. I hope it didn't get them, too. What happens to me now? Do I see my life flash before my eyes? Is that actually something that happens? I don't see...no, wait. I see...no idea what; my eyes are shut. Buck. Don't tell me I have to open my eyes in here just to see my own life one last time! ...Darn it. Well, this is going to sting.

Squinting, Twilight could only make out a hazy white-blue blur. However, she was surprised to find that looking didn't hurt, the wall which encased her head was held back between her muzzle and horn, and so pressed against her eyes only lightly. It was perfectly smooth, and the fluids on it didn't seem to cause irritation in her eyes. Opening her eyes wide now, she began to see that it was also clear, allowing her to see the forest around her, and also that it seemed to be the source of the light; that it glowed a faint teal colour.

Twilight tried to turn her head to see what had a hold of her, but the narrow tube restricted her movement. And to make it more difficult, every time she turned or struggled the walls encasing her would clench down, holding her still and covering her with more sticky wetness. As it was she could feel the edge of the hole passing her shoulders. A stream of fluids ran from it, soaking her barrel.

Raising her eyes as best she could, Twilight could make out two other glowing figures a few meters away. Both seemed to be wrestling Rainbow Dash. The figures had the bodies of ponies, but no definition. They were clear and glowed the same faint blue-tinted light. They looked like nothing more than water given shape, light, and intention. One of the figures had its arms wrapped around Rainbow's midsection, pinning her wings down. As she watched, Rainbow threw out a hoof at where it stood, bending its leg backward in a move that would split skin and bone. The seemingly gelatinous limb, however, returned to its previous shape without so much as a bruise.

While Rainbow struggled, Rarity wobbled over to the attacking water-ponies. She seemed to have trouble standing, and her eyes were glazed, but she wore a determined frown. Reaching the nearest assailant, she placed her hooves upon it and gave it a shove. The assailant looked from Rarity to her hoof on its flank and back, appearing to have just noticed her presence. Casually, it took one step to the side. Rarity fell to the ground, gasping for breath, and did not get back to her hooves. It returned its attention to Rainbow Dash.

As she watched, Twilight felt her forehooves, and then her head, pass from the tight canal into what turned out to be a goo filled sack. Twilight quickly felt her way around it, searching for a pocket of air, and finding none. Her mind turned to the only way out she could find, which was still making its way down her body. It seemed to have become stuck around her flanks and was trying to pull them in with slowly rising suction. Twilight pushed back against the walls of her sack as hard as she could. They were smooth and rubbery and, unfortunately, very tough. As she pushed, Twilight felt the whole sack jostle. A translucent hoof flew into her vision and struck her in the stomach. Even through the sack it knocked the wind out of her, and she chocked and sputtered on the fluid all around her. Some of it settled in her lungs, making them feel dense and heavy but, surprisingly, easing her desperate need for air. She breathed it in desperately, achingly slowly due to its thickness. Imminent death took a step back from Twilight's thoughts, and she couldn't help by relax in her relief. She almost wasn't worried as, with a slick *pop*, her plot joined her in the tight sack, that she now realised was in the swollen belly of a one of the gooey-water-ponies. The liquid she was in moved of its own accord, pulling her rear hooves inside, and the soaked slit she had entered through, resting between the pony's rear legs, tightened down to a fraction of its size, sealing her in.

Apparently satisfied with her predicament, Twilight's newfound host shook itself out and trotted over to the other ponies, sitting down to watch. It brought one hoof to its barrel and began to rub Twilight's belly through its own. Twilight pulled away, but was forced back, her hooves pulled aside by the animate fluid around her. The hoof touched first against where it had struck her, gently, and began to stroke her, up and down, in an almost sooth- It's not soothing! It's a bucking even-I-don't-know-what! That ate me! Well, not "ate," exactly, but it, it. You know what? I don't even want to think about it, or the hoof rubbing my, mmy, mmmm DISTRACTION! What's a good distraction? What's happening around, oh, stars, Rainbow!

Twilight stared, and then shut her eyes, and then opened them again. It was all she could do, realistically, as she watched Rainbow Dash succumb to the same fate she had. One pony still had its hooves around her wings, holding her still, and another had fed Rainbow's rear hooves into her dripping marehood and was backing up into Rainbow's rear. In only a few seconds plot, flanks, and barrel were stuffed into a thick, swelling womb. Rainbow's toned body, now sweaty with exertion, apparently proving far easier to squeeze through the pony's tight passage.

As Rainbow's chances to escape dwindled her grunts and growls gave way to screams of rage. "I swear when this is over I'll make you regret it! You'll regret getting up this morning! You'll regret the day you were born! I'll-" The free goo pony stuffed a hoof in her mouth. Glaring, Rainbow bit it, hard enough that her teeth were visible through the pony's clear form. The pony didn't even seem fazed. It merely pushed Dash's head past the spread legs of its companion and into Dash's new host.

A tingling in her teats dragged Twilight's attention back to her own predicament. Her host's hoof had travelled down her body and was now firmly stroking her crotch. Warmth spread from where it touched her deeper into Twilight's body, and the tingling soon followed. Beneath the pony's ministrations, Twilight felt her crotch tighten, and soft mounds formed beneath her teats. They continued to swell, bulging out from Twilight's body and presenting her nipples to the world. Her nipples themselves grew larger and darkened, hardening as well. The goo that contained her shifted, and the walls of her prison pressed against her newfound tits and split, freeing them to the cool night air. They hung from her host at about the same place as her host would have had teats. Now unimpeded, her host began to rub her directly, and, sitting back on its rear, brought a second hoof up to fondle her swelling mammaries.

In time, the tingling and heat of her crotch subsided, and her tits quivered of their own accord as a gentle, deep rushing feeling started up within them. The skin of each mound stopped expanding, and a fullness began to build within them. Her host shifted, and Twilight saw the still-unburdened goo pony approaching Rarity, who still lied where she had fallen on the ground. But then her host turned around, and all Twilight could see was the black forest, though she could still hear.

The rustle of leaves beneath hooves continued up to where Twilight thought Rarity must be, and Rarity mumbled something she couldn't hear. Then louder, "and what exactly do you expect me to, oh. No. Simply no." There was a soft thump of rubber tapping pony and some more rustling of leaves. "Yes, I see it," Rarity deadpanned, "and no, I'm not doing it. You barbaric ruffians have gone more than far enough already." Twilight's host spread its legs, and a cool breeze passed over her tits, which were beginning to feel really full as the rushing within them continued. "I said no," Rarity said, sounding just a little less absolute than she had a moment ago. Twilight couldn't help but get the feeling that Rarity was speaking more to her boobs than to the goo pony. Twilight's host began to sway from side to side, and Twilight's overfull crotchtits followed suit, so heavy now that they yanked Twilight herself against the rubbery wall of her host's womb as they did so. "Oh, no," Rarity's voice was beginning to shake now, "Please. Please no." And then the gentle rushing in Twilight's tits became a surging torrent and her tits felt tighter and more full than Pinkie's water balloon had when she accidentally sat on it. Twilight gasped in relief, as much as the goo allowed her, as twin streams of fresh milk burst from her teats. The next thing she knew, warm lips has closed around one of her nipples and were suckling desperately at her. After a moment, the desperation gave way to a softer, more sensual tug. A sweet, soothing feeling spread through Twilight. This...This...Buck it. This isn't happening. I don't even know how this isn't happening, but it's not. It's too crazy, too surreal.

Her host turned to the side to look back at its companions, allowing Twilight to see everypony else again. Rarity's face was largely hidden by Twilight's own flank, leg, and swollen crotchtits, but trickles of milk could be seen running over her head and down her neck. Rainbow's host seemed content to stand where she had been, its side facing the rest of the clearing. From within, Rainbow was watching Rarity, her mouth open in an expression of unthinking shock that Twilight wasn't sure she had ever seen on her friend before. The unburdened goo pony, however, showed no interest in the spectacle, and was beginning to approach Dash's host instead.

As it moved, the free goo pony's nethers seemed to melt. All but dripping off of it before suddenly growing firm again, the new tension causing the goo to extend up and forward, while a pair of drops stayed loose, forming a sack. Twilight was pretty sure she'd read about this sort of body part before. While the shaft grew more stiff, the sack beneath it continued to swell, fluid seeming to pour from the pony's body down into it. And that fluid seemed to take on a strange orange luminescence, at odds with the light blue of the rest of the pony.

Dash had still been staring slack-jawed until this point, but was yanked out of her stupor as the fluid she was in shifted, lining her open mouth and throat up with the slit through which she had entered. Alarmed, her teeth clamped down on nothing, but somehow remained open. Twilight could only assume the goo was holding them wide. Then Dash's host spread its hind legs, presenting itself, and Twilight barely had time to piece together what was happening before the free pony buried its shaft half way down Rainbow's throat. The wet slap of its thrust colliding with Dash's host's plot was loud enough for Twilight to hear perfectly despite her rubbery prison.

The pony now mounting Dash's host paused a moment, before beginning a rhythm of slow, strong thrusts. The belly that held Rainbow wobbled slightly as its resident thrashed about as much as she could, but it seemed the most effective thing she could do was glare hatefully at the clear organ now coated in her saliva. It wasn't very effective at all. As the thrusting quickened, the shakes of Dash's host shifted into a steady swaying, rocking its belly, and Dash, into every oncoming thrust.

Twilight tried to yelp as the tugging on her crotch moved to her other teat. But she continued to stare forward, and at anything else. It was then that she noticed the trail of orange leading from the top pony's sack through its length and into Rainbow's mouth. Rainbow herself seemed to have shifted her expression from something murderous to both pleading and disgusted. The orange stream continued headless of this, growing thicker and beginning to come in bursts. The mounting pony's sack was quickly emptied, and Rainbow's own belly grew taut and smoothly rounded. Only then did the goo pony withdraw, looking rather thinner than it had to start with. Dash coughed and hacked as she regained the use of her mouth, but not a drop of the orange-tinted fluid left her. She wrapped her front hooves around her midsection and groaned.

The now-thin pony walked up to the pond Rarity had fallen in, and then onto the pond, standing atop the rippling surface as if it were perfectly solid. It stopped in the middle, and after a moment the pond seemed to converge on it, liquid running up each of its hooves. The liquid melded with the strange pony, filling it out once again. This is not happening. Yes, it is happen- no, it's not. Yes, it's not. But if it was happening, that...thing. That anomaly. That would be a very fascinating thing to study. It looks to be made of some sort of solid material. Well, physical material, if not solid. Probably guided by magic, or else the most complex, flexible biological organism I've ever seen. But, if it can replenish from the magical residue so quickly and so seamlessly, that would suggest it is made of magical residue. But if that's the case, what kind of consciousness could it be using? A generic construct would...

Twilight was almost so wrapped up in her thoughts that she didn't notice when Rarity drew the last few dregs of milk from her teats and finally pulled away. Almost. Maybe she could focus harder next time. Goo spread across her now drained teats and pulled them back inside with the rest of her as Rarity walked away. For her own part, Rarity looked even woozier than when she started, her eyes half-lidded and a lazy smile across her face. She could only sway a few steps out from behind Twilight before letting herself fall back to the ground. Her belly was bulging beneath her and sloshed as she moved, and streaks of wetness that blended almost perfectly with her coat stretched all the way from her mouth down her swollen middle. She seemed to mutter something happily before laying her head down and shutting her eyes. Rather than falling silent, hew belly seemed to grow louder the more still she lay there, and by the time she was asleep it was rumbling and churning. As it did so, it seemed to shrink, or rather disperse, and Rarity's body grew softer and more full. The diamonds of her cutie mark were stretched taut as the flesh below them expanded, new, soft fat smoothing her every curve from her rump to her chest.

A feeling of tightness washed over Twilight. Afraid, for a moment, that she was plumping up the same way, she began to look back at herself, but found she had no space to move at all. The feeling then left her as the sack she was in relaxed and expanded, briefly, before contracting harder than before, and the fluid around Twilight's hind hooves began to flow away from her. I'm...being birthed? Ew, ew, ew! But hey, that means freedom right? Please tell me that means they're done with me. The flowing around her back legs intensified, and she let them get dragged into the tight passage through which she had been pulled in. She was glad to again feel the cool night air drifting past her soaking rear hooves. The canal was slick and malleable and glided easily up to her plot. There, beneath the mounting pressure, it expanded across her cheeks to fully encompass her rear, and began to slide up her midsection. Twilight actually smiled when she finally felt the leaves and dirt of the forest floor beneath her hooves. Reaching her withers, the passage of her escape suddenly tightened, clamping her chest, forehooves, and head in the restricting tube. Surprised, Twilight quickly planted her rear hooves and pulled back as hard as she could, which accomplished little more than forcing her plot into the air.

Braced as it was, her rear was more than able to support the sudden weight Twilight felt upon it. Turning her head to the side, Twilight could just see in her periphery the soft glow of a goo pony atop her, and the familiar blue plot of her friend within it. Twilight was sure her heart skipped a beat as she felt a firm shaft press between her hind legs, spreading her folds apart and beginning to push into her body. It was slick and thankfully not as wide as the one she had witnessed moments ago. It was cool to the touch, but wherever it touched seemed to grow warmer in moments, radiating a soothing heat that caused her muscles to relax and helped her to stretch. It paused only momentarily as it entered her before jerking further in with a quick spike of pain. The warmth soon travelled up to dull the pain into a light throbbing. Once inside it began to expand, thickening within her. Her soothed flesh stretched easily to accommodate it as it grew, her entrance spreading wide. Out of the corner of her eye, Twilight was vaguely aware of the last glimpses of Rainbow Dash disappearing from her view. Twilight's limbs were feeling shaky now, and did not seem to want to respond. The thick shaft held her still, however, even though she raised her hind hooves, hoping it couldn't support her weight. It could, and she quickly became uncomfortable, so hooves on the ground it was.

Soon a rushing began to pass through it, and Twilight felt thick, heavy fluid flow into her. It's wasn't an altogether unpleasant feeling, just something Twilight was not used to feeling, ever. She began to feel the fluid building up inside her, its only way out blocked by the now hoof-thick hose in her marehood. As her womb filled, it expanded, pressing against her insides and the now-taut skin of her underside. Just as her skin began to stretch to accommodate the new addition to her belly, the flow wound down to a trickle, and something large and solid and struggling pressed against her rear. The soothing warmth intensified, and Twilight felt her entire rear half relax and loosen. Her marehood spread easily as something - a something that she had a sinking suspicion was cyan and rainbow and something-that-she-never-really-imagined-or-wanted-where-it-was-right-now - slid easily past her entrance. A loud gurgle emanated from her belly, which continued to grow, the new space within creating a vacuum to draw Dash further inside. Twilight could just make out what she thought were pony hooves passing into the laden sack of fluid within her, but was distracted as Dash's own swollen midsection threatened to burst her overfull canal. The goo pony mounting her seemed to realise this, and slowly withdrew the shaft through which it had been guiding Dash inside. As if to make up the slack, the churning of Twilight's belly intensified, and Dash's belly began to pass into Twilight's strained marehood. The cheeks of Twilight's plot spread, her inner walls began to throb, and a few drops of cream were squeezed from her teats, apparently having been produced since Rarity drained them dry. Still, it didn't hurt. If they ever got out of this predicament, preferably with samples, Twilight suspected they could create a wonder drug for pain resistance. And with an almighty pop, Twilight felt Dash's swollen belly pass into her womb, Dash's smaller plot and hind hooves following easily after. As soon as her canal was empty, the soothing heat dispersed, and Twilight's rear returned to its pervious shape and elasticity.

By this point she could feel the tips of the grass brushing against her middle, despite the fact she was standing, or close to it. That same grass became much easier to feel as the gooey slit that held her relaxed, and she fell to the ground. Coughing and hacking, she drew her first breath in what felt like ages. As much as she had been fine while the goo had supplied her with oxygen, it was no substitute for the feeling of air in her lungs. The newfound weight in her gut shifted as she breathed. Once in a while she could feel movement from within it, but not the violent thrashing Dash had been making before. She probably doesn't want to hurt me. I guess that's good. Twilight frowned. I have to get us out of here. But there's no way I'm outrunning anything like this. That leaves only one thing. She tried to picture her library in Ponyville, and to see the three of them there, away from all of this around her. She charged her horn, and was rewarded by a few sparks and a splitting headache. Gah! Ow. They really did a number on my casting. Abandoning her spell for now, she set about using fallen leaves to try to wipe her horn dry.

As she worked, she saw the pony that had been standing on the pool walking up to Rarity. It was looking a lot more full than it had when it had finished with Dash, though the shaft it sported between its legs hadn't changed at all. The pony that had carried Dash strolled past Twilight, joining its companion beside Rarity's pudgy, sleeping form. It poked at her a few times, enough to get a mumbled complaint and dreary groan, before walking over to her plot. After a moment, it bend down and hoisted Rarity's rear into the air planting her hooves where they would support it. At about the same time the freshly renewed pony flopped down on Rarity's back and slid it's slick-but-firm shaft up to its base in her marehood. This woke Rarity up. Granted, she didn't seem to gather what was happening to her for a few seconds still. She also seemed disconcerted by the added weight she now bore. By the time her mouth was forming coherent words, the pony which had lifted her rear was laying across her withers, effectively pinning her. Meanwhile the pony mounting her had wrapped its hooves around her middle. They sunk slightly into the soft flesh of Rarity's underside. It also began thrusting into her rear, causing her smooth plot to squish beneath each thrust and shake from each impact.

"Twilight, darling, what is ha-um...no. Actually, I-I don't want to know. Where- Oh, *huff* Ah, where is Rainbow?"

Twilight grimaced, and patted her swollen belly.

"Oh. Oh dear."

The pony atop her was starting to lose some of its freshly acquired bulk, likely pouring something into Rarity as it worked.

"Do we know yet what they are? What they want?" Rarity seemed intent on focusing on anything other than what was happening to her.

"They seem to be made of congealed magic residue. If they're naturally occurring, I've never heard of them, but they still could be some sort of incredibly rare creature. The only other thing I could think of is a sort of spell-sustained construct, thought they're well beyond anything I've read about. Their seeming autonomy would rely on some sort of bound consciousness, so darker magics; stuff I'd never use and rarely look into."

Rarity's belly was taut and round now. Her breathing was heavy, and she was sweating horribly. Still she focused intently on what Twilight was saying.

"As for what they want?" Twilight gestured about the clearing. "This, I guess. I don't really see the point. If it's for their own pleasure, they've been really distant about it; they don't seem to have much emotion at all. If they're beings of magic, it's possible they gain some biological necessity from pony magic, though this seems an odd way to access it. If it's a spell, it depends on the caster."

At that point the pony mounting Rarity withdrew, its shaft, along with the shaft of its assistant-in-holding-Rarity-down, melting back into their bodies. The three goo ponies then spread out, standing at the edges of the clearing and watching Twilight and Rarity as they lay in the middle.

Rarity turned her head to eye her new proportions. She only balked a little bit at what she saw. "Well, we're alive. We are all alive, aren't we?" She asked, gesturing to Twilight's swollen middle.

"Yes. She's been squirming around every now and then. If we're lucky I'll be able to teleport her out when all of this is done."

"Oh thank Celestia," Rarity exhaled, seemingly having held her breath. "And I suppose I'll get the chance to make some new dresses. I don't think I carry anything that would fit these...well, these particular proportions. And that would of course be temporary. I can work this off in time." She seemed to brighten at the idea.

A long, slow, wet rumble rose from Twilight's gut. It was followed by a number of smaller gurgles and squelches as the weight she was carrying shifted within her. Twilight and Rarity watched with concern as Twilight's belly continued to lazily stir about, emitting the occasional slosh. Rarity struggled to her hooves and walked over, placing one hoof carefully on Twilight's distended midsection. After a moment, Twilight felt a hoof press back against it from within her.

"She's still alright, I hope," said Twilight, as Rarity gasped. Twilight's eyes flicked back to her swollen middle. She didn't feel anything different, and couldn't tell what had surprised Rarity.

"No, it's - ooh," Rarity managed, moving her hoof back from Twilight's bloated belly to grasp her own. A gurgle from within her drowned out Twilight's quiet sloshing, and she let out a low moan. A trickle of liquid dripped to the ground between her hind hooves as a blush crossed her face. The blush deepened as she glanced guiltily at Twilight, and she moved her hind hoof forward to block Twilight's view of the liquid dripping from her. Twilight chuckled despite herself. After all this, after every mad thing they had gone through tonight, and with everything else of greater concern around them, Rarity was still concerned and embarrassed by such an inconsequential faux pas.

Rarity clamped her eyes shut and bit her lower lip. The trickle from her nethers returned and her belly rumbled and surged forth, forcing the hoof she held against it back and visibly dragging her body down. She flopped down on her soft plot and managed a few deep breaths before another surge of growth swelled her up even larger than Twilight.

"Ooooh. Oh, stars. I can't take much more. Oh!" Her belly filled further, the growth slowly tapering off as she expanded one final foot. Rarity fell to her back, held in place beneath her own weight, barely able to breathe.

Twilight felt her own insides clench, growing tight and restricting. After a moment they relaxed. Then a gurgle passed through her, and her gut tightened again. The feeling of something unexpected flowing through her was startling, but the liquid beginning to pour from her marehood left a relaxing warmth in its wake. Oh no. No. I recognise this. I don't want this. Can't I just teleport her? Please? Twilight's pleas went unheeded as her belly clamped down tight. Thick fluids poured from her rear lips and a soothing warmth spread all the way from her teats to her tail. Then the flow fell to a trickle as a great weight began to spread her passage from within. Twilight spread her rear legs and tried to focus on her breathing, which seemed want to stop whenever her body demanded she help heave Rainbow's passage along. She was growing weary and gasping for breath even before Rainbow's head had fully emerged. Thankfully, the gentle warmth and the earlier stretching she had gone through made her job a lot easier. Even as Dash's swollen middle pressed against her sweat-coated plot and a few drops of milk were again forced from her teats, Twilight couldn't help but think it could have been a lot worse. As Dash's final hoof fell free, Twilight collapsed to the ground, utterly spent.

The world swayed for a few moments, and Twilight held still. Slowly things started to come back into focus, and she found the strength to lift her head. One of the goo ponies had stepped forward, and was lifting Dash over to were Rarity still lay. It laid her between Rarity's hind legs, resting against her marehood. Dash, for her part, seemed no more with it than Twilight. Her eyes were half-lidded and crossed at strange angles. Twilight wasn't quite sure who that reminded her of. Through her stupor, Rainbow still seemed to recognise Twilight, and, smiling, raised one hoof to wave weakly at her. It was then that Twilight noticed the sack. Rainbow's entire body seemed to be contained within a clear, airtight bag that caught the light of the surrounding luminescent ponies as she waved it about. Twilight also noticed that beneath the blue fur of Dash's underside, her belly had gone clear, revealing the orange fluid she had been pumped full of earlier. It seemed to have lost its slight glow, and the clearness of all the other goo, now just a solid orange.

The mound Dash was leaning against sloshed around, and Rarity groaned beneath it. Then the sloshing sank into a deep gurgle, the mound tightened, becoming firm, and Rarity's breath hitched. Thick goo burst from her marehood, washing around Dash's plot and hind legs. It took Twilight a moment to realise that the goo was inside the sack with Rainbow. Rainbow herself tried to lean away, but found her sack, and thus herself, stuck to Rarity's pouring nethers. Her belly began to deflate as Rainbow was encased in more and more of the clear fluids. At length, Rarity herself became visible again beneath her shrinking fullness. She was exhausted, dripping with sweat, and her mane and seen better days, including every other day Twilight had seen it. Rainbow's sack had been stretched to its limit, forming an oblong casing large enough for her to stand in, and filled with a liquid so thick and dense that she could float suspended it in effortlessly. As the last few gushes flowed out of Rarity to join her, the sack began to lose its clarity, becoming cyan and visibly hardening. Rainbow, seeing this, paddled her way to the edge and pushed against the barrier. However, she could find no purchase to brace herself against, and so only caused herself to slip backwards. The last Twilight saw of her, she levelled a glare that could scare Angel Bunny at the nearest pony of goo, which itself just looked on impassively.

Twilight felt it then: the first sparks of her magic returning. She threw everything she had into directing her horn, and, sluggishly, it began to respond. Three ponies, one teleport, and they could find a way to reverse whatever had happened to Dash, she was sure of it. All she needed was- *splat*. Twilight coughed and sputtered at the liquid that had hit her in the face. She suddenly felt very woozy, and the world swam circles about her. As the darkness of the night overcame the fading lights around her, she had one final thought.

This is the most comfortable boulder I've ever laid my head across.

Twilight wasn't sure when the sunlight had first reached her. She wasn't sure how long the birds had been chirping. And she wasn't sure how long she had been doing her best to ignore both. But she was sure of one thing: boulders made for the worst pillows ever. Rising to three hooves, the fourth on her aching neck, Twilight took in her surroundings. Rarity was lying nearby. She seemed entirely normal, if a little messy. And her position can't have been any more comfortable than Twilight's had been.

"Rarity?"

"Twilight? My, I am so very sorry darling. I seem to have slept through your, um, magic thing." Rarity smiled sheepishly. "And on top of that had the strangest dream I think I've ever had."

"You too? About what?"

"Oh, um, I think I'd be glad to hear yours first, if you want."

"You don't want to hear mine, ever," Twilight deadpanned. She continuing to look around the clearing, from the rock her head had been atop, to a patch of freshly laid dirt, to large patches of trampled grass and leaves. The closer she looked, the more concerned she became.

"Twilight dear, where is Rainbow?"

"...Oh, buck."

Author's Note

Well, that was a thing I wrote.

While the ending is obviously open for a follow-up, I have very little time to write, and other ideas besides. If I ever do create a sequel, it won't be for a long time.

Thank you for reading. I hope you enjoyed it.

Any feedback (besides WTF! Tartarusforyou! My eyes!) would be greatly appreciated.