Feed the World

by AzureDreamer

Rating: mature
Tags: Twilight Sparkle, Anthro, Porn, My Little Pony: Friendship is Magic, Fetish, Sex, Derpy Hooves, Slice of Life
Length: 5543

Twilight wants to solve world hunger using Derpy's big milky tits. It goes wrong (or maybe right, depending on your perspective).

Derpy Hooves suffers from a severe hormonal imbalance; though really, suffers isn't quite the right word. Whenever she breastfeeds, her breasts get bigger and milkier. As far as she's been able to figure out, there is no upper limit - she's just going to keep growing forever. Still, inconvenience aside, she's managed to create a fairly comfortable life for herself, settling into an admittedly weird niche in Ponyville's local culture.

Until one day Twilight Sparkle decides she really wants to know why Derpy's breasts are growing, and possibly even to replicate the condition artificially.

She foresees no way that this plan could go wrong.

WARNING! CONTAINS ANTHROS, BREAST EXPANSION, LACTATION, EXTREME HYPER BREASTS, BREASTFEEDING, AND PROBABLY A BUNCH OF OTHER WEIRD STUFF

cover art by Shnider.

Commissioned by Nimnul.

This story was a patreon reward! If you liked it, consider donating to fund more stories like it!

Published 2019-11-30 23:20:02 UTC
Last updated 2019-11-30 23:20:02 UTC

Derp Milk

Twilight Sparkle didn’t seem at first glance to be the kind of pony to be into bondage. You can’t judge a book by its cover, Derpy supposed. After all, regardless of surface appearances, here she was in the basement of the library, strapped to a chair and barely wearing any clothing while Twilight poked and prodded at her tits. How could this be anything other than a sex thing, she wondered?

Of course, granted, Derpy wasn’t really wearing that much less than she normally did. Her top had been removed and discarded, but that was about it.She’d gotten in the habit of dressing... lightly, ever since Dinky was born. Out of necessity, really, or at least that’s what she told herself. She couldn’t think of any pre-Dinky clothing that still fit her even remotely, after all. Besides which, there was the issue of... leaks. She needed to buy specialty bras anyway, between the milk and the fact that they were still getting bigger, so she figured she might as well kill two birds with one stone and go for swimwear. It was a bit odd, to be sure, for someone who lived in landlocked Ponyville to mostly go around in bikinis, but it was convenient. But she had her reasons.

The growth had been slow, at first. B cups to B and a half cups. Fairly standard for pregnancies, as she understood it. She’d just assumed it to be entirely normal swelling, getting ready to take care of the baby. She hadn’t handled it differently from how you were supposed to handle breastfeeding, she didn’t think. Breastfeed for the first year and a half or so, slowly transition to bottle feeding, and from there to solid foods, was the typical process. Derpy had elected to skip the bottle phase, but otherwise Dinky had taken to solid foods just fine. As Derpy understood it, from there the mother’s breasts would eventually stop producing milk and shrink back down, though subsequent children could result in the growth being more pronounced and more permanent.

Neither had happened. Ever. Derpy’s breasts did not shrink back down, nor did they stop lactating. If anything, they got bigger and more productive as the years went on. Dinky had been alive for nine years now, and Derpy’s breasts were well into three or even four times the size of her head, dominating her torso with massive titflesh. Constantly leaky, so full that they couldn’t possibly hope to contain the milk – and that was the best case scenario. The worst case scenario was... Well. Quite a lot of milk, to put it bluntly. Inhuman amounts. Impossible amounts, if she was frank.

“Which is why you’re here. Hold still, this is gonna sting a little.”

“I- ow!”

“Told you!”

“I still don’t get it,” Derpy grumbled as Twilight sauntered off with a needle full of her blood.

“This kind of thing isn’t normal,” Twilight replied succinctly, fiddling with various large and inscrutable machines.

“And that’s... bad?” Derpy was pretty sure it wasn’t bad. No one else seemed to think it was bad. At worst ponies took it in stride, and if anything a lot of her friends seemed to be really fucking into it.

“No, no, no, it’s not bad at all,” Twilight replied. “I don’t want a repeat of the whole Pinkie Sense debacle, believe me. I’ve learned my lesson on that front. This is just... Curiosity, I guess.”

“Curiosity?”

“I wanna know the how and the why.” She pressed a few buttons on the various machines and watched intently as they whirred and beeped and did machine things that completely flew over Derpy’s head. “I’m gonna need some samples of breast tissue and milk.”

“No more needles!”

“Don’t worry, I won’t need needles for this.” Once again, Twilight walked over to where Derpy was firmly strapped in place and pulled out a pair of tweezers. “I can get the tissue sample with magic, I don’t need a lot and anyway it’s not liquid.”

“What about the milk?” Derpy asked with no small amount of apprehension. She hated needles.

“How do you think I’m gonna get a sample of milk?”

“... Oh. Yeah.”

“Don’t worry, we’re probably done with the needles.”

“Probably?!”

“Probably,” Twilight replied. There was a flash of light and suddenly the tweezers had... something pinched in between them. “There. I can get the milk sample later.”

“Why are you so interested in this, anyway?”

“I told you, curiosity. I want to know how this happens. Maybe even replicate it!”

“Wh- why would you want to replicate it?”

“Various reasons,” Twilight replied tersely, blushing slightly. “It would take some logistical doing, but if I could make any mare in the world have breasts like yours, we could solve world hunger?”

“Solve world hunger?”

“Yes.”

Derpy couldn’t help but stare in blank confusion at Twilight. She was one hundred percent certain that the unicorn wasn’t being entirely honest about her motivations. Solving world hunger with milky tits was a patently ridiculous proposal. Derpy would be the first to admit she wasn’t the smartest pony, but even she could see that much.And beyond that, well, it wasn’t hard to notice that Twilight’s figure could be charitably described as very svelte. She had a young nerd build – average height and very scrawny, the kind of person who probably has to be bullied into eating at mealtimes. Where Derpy was a motherly milf, Twilight was a scrawny flat-chested twig. If that wasn’t Twilight’s primary motivation for wanting to duplicate Derpy’s condition, she’d buy a hat and then eat that hat.

“A-anyway, I still need that milk sample. I’d also like to, ah, see them growing if at all possible. You said the growth occurs when you lactate, yes?”

“Well, no, I get bigger when I breastfeed, and-”

“Right, right, semantics.”

“It’s not semantics, it’s gotta be intimate or it doesn’t work. Just strapping me up to a milking machine won’t make me grow.”

“Hm.” Twilight rubbed her chin in thought. “Okay, then clearly there’s a psychological component as well. In that case actually seeing the growth happen can wait until I get my sample. Hold still.”

“Okay,” Derpy said, rolling her eyes in mild exasperation. She mostly just wanted to get this shit over with so she could go home. Humouring Twilight a little bit was all well and good, but she didn’t really know the younger mare all that well – certainly not well enough for this kind of sexual roleplay. And it was, ultimately, clearly a sex thing, even if Twilight said otherwise. Certainly, at the end of the day, Derpy fetishized the fuck out of her tits getting bigger. And, again, she was almost certain that Twilight had similar motivations for wanting to replicate the condition.

Twilight circled around behind Derpy, then back in front, holding the tubes of a milking machine. She placed the cups over Derpy’s nipples, and the pegasus winced slightly from the sensation of cold rubber against her fur. The machine whirred to life, creating suction that held the cups firmly in place. “I’m going to stimulate lactation,” Twilight said, cold and clinical. Not very fun, really. She was bad at this whole sexual roleplay thing – though she also seemed to be in denial that this was sexual roleplay.

Still, she was at least pretty good at the important bit. Twilight’s touch was gentle and her hands were warm. It didn’t take much effort to get Derpy started – some rhythmic pressing and rubbing and squeezing, along with the suction of the milking machine was more than enough to draw out a steady flow of liquid. And, in spite of the impersonal nature of it, Twilight’s touch was more than enough to prompt a warmth in Derpy’s loins and a tightness in her chest. “Mnf~”

“There, that should be enough.” Twilight abruptly turned off the milking machine and removed the cups, leaving Derpy squirming uncomfortably in the chair that she was still fucking strapped into. No longer constrained to the machine’s cups, the milk flowed steadily, soaking into Derpy’s fur on her chest and thighs. Now that it’d started, it wasn’t going to stop any time soon – and Derpy could feel her tits getting ever so slightly fuller and heavier. Apparently Twilight’s touch really had been more than intimate enough to get things started.

Twilight seemed content to ignore the state she’d left Derpy in, instead turning her attention to the machines once more. She pressed a few more buttons and there was more whirring and beeping and things that once again went completely over Derpy’s head. “Yeah, I thought so. Looks like it’s a simple hormonal imbalance with a little bit of a magical component. Unsurprising, and very possible to replicate with some supplements and a bit of magic.”

“That’s lovely,” Derpy replied, just a bit frustrated at the whole situation. She really, really needed some release and it looked like Twilight wasn’t gonna give it to her.

“You should be happy! Chemically speaking, your milk is both delicious and nutritious. It’s got pretty much everything in it that you need to live and you produce a stupefyingly high amount of it. If I can replicate it, we could legitimately feed the world.” Once again, Derpy found herself intensely dubious. Even if her milk was absurdly nutritious, she highly doubted that people could subside off of milk alone. And even if they could, it wouldn’t magically result in an infinite supply of food because the ponies making the milk still needed food. She was pretty sure you couldn’t just drink your own milk and get all the nutrition you need from it and also keep producing milk that is nutritious enough for other people and yourself to live off of exclusively.

That being said, there was an undeniable appeal to the whole idea, even if it was kind of silly. The thought about feeding the entire world with her breastmilk was dumb, but it was also kinda hot. If only because of just how big her breasts would hafta get in order to facilitate that – never mind that Twilight implied the load would be shared. Just the thought was enough to make her body hotter and her breasts tighter.

Still, her dubiousness was clearly visible on her face, prompting an indignant huff from Twilight. “Here, watch, I’ll prove it.” More buttons, more whirring, more beeping, and after a moment the machine popped out a small plastic looking bottle filled with pills – Twilight calmly dispensed one before putting the bottle on the table. “Taking these should induce the body to produce more of the specific hormones that result in your condition. In layman’s terms, if I eat this I’ll have tits that grow and leak all the time, too, at least temporarily. One should be enough for now.”

Twilight tossed the pill into her mouth, and then conjured a tall glass of what appeared to be fresh Derpy milk with which to wash it down. She let out a cute little burp before dismissing the glass into the aether and staring down expectantly at her flat chest.

Naturally, nothing happened. “Oh come on.”

“I told you,” Derpy said wearily. “They don’t just get bigger magically. Someone’s gotta drink from ‘em.”

“Oh,” Twilight said bluntly, blushing slightly. “Yes, that makes sense given what you said. Though, ah, that you specifically have to breastfeed is new information.” Her blush deepened. “U-um, could you maybe-”

“Just untie me and I’ll suck your tits as much as you want,” Derpy replied with a roll of her eyes before Twilight could finish. “But after you’re done you’ve gotta suck my tits. You’ve gotten me worked up.”

“Um, r-right.” Twilight quickly walked over – there wasn’t exactly much distance between the machine and the chair – and undid the straps holding Derpy in place.

Derpy immediately reached up and grabbed Twilight by the back of her head and pulled her forward, leaving the smaller unicorn abruptly buried in copious (and conspicuously moist) cleavage. “Mnf!”

“Sorry, a little bit excited. Gimme a sec and we’ll get goin’ for real.” She pushed Twilight deeper and squeezed her arms together in the process, leaving Twilight trapped between tits easily four times the size of her head. The pressure forced even more milk from her tits, and Twilight quickly found her lab coat soaked through.The pegasus wrapped her thick thighs around Twilight’s hips, pulling the smaller pony tightly against her body so she could grind. “Just need to get off real quick so I can think straight.”

“Mph!” Twilight objected, her voice muffled by titflesh. She squirmed and struggled and eventually managed to pull free – she wasn’t exactly the strongest pony, but neither was Derpy, and her muscles were a bit preoccupied. “Stop this at once! This is a laboratory, not a brothel. You can’t just-”

Twilight found herself abruptly interrupted as Derpy once again grabbed the back of her head, this time forcefully pulling her in for a kiss. The unicorn flailed awkwardly in an attempt to escape that was cut short as Derpy’s other hand wandered its way under her skirt and began rubbing against her crotch. It was Twilight’s turn to feel the heat and the tightness, and her body began to instinctively press against Derpy’s, her own flat chest rubbing against Derpy’s massive mounds. Her lab coat and blouse very quickly became even more soaked through, and Twilight quickly realized it wasn’t just the result of Derpy’s own milk.

The larger pony broke the kiss. “You gotta be enjoying yourself. Otherwise it doesn’t work.”

“I- gnhaaaaan~” Whatever Twilight had to say was reduced to a wordless moan as Derpy slid her fingers into the unicorn’s tight snatch. She placed her thumb on Twilight’s clit, rubbing it firmly as she began to pump in and out.

“Good girl. Cum for me~”

Twilight did exactly what she was told. Slick feminine fluids practically gushed all over Derpy’s hand and Twilight’s skirt, and her whole body froze up for a good minute before collapsing forward onto Derpy’s body. “That... That was...”

“A good start,” Derpy finished. “But I’ve not even started sucking your tits yet, so we’ve got a long way to go~” The larger mare picked Twilight up and carried her over to the desk, laying her down on top of it with no care for the various sundry bits of paper and scientific equipment and such. “Now,” Derpy said, climbing up and straddling Twilight’s hips. “Let’s get on that, shall we?”

“Oh, Celestia, yes,” Twilight replied breathily. Her body felt so tight and full, especially her chest. She oh so desperately needed a release.

And it looked like Derpy was going to be the one to give it to her.

“Now, first thing’s first. Let’s get that pesky top out of the way.” Part of her wanted to just tear it the fuck off, get things going. It wasn’t like Twilight was ever gonna be able to wear it again if this worked. But ultimately, it was probably a bit rude, so she elected not to. Instead, she reached down, grabbing it by the hem and pulling it up and over the endgoal. It mostly stayed there on its own, thankfully, though Twilight’s breasts weren’t yet big enough for it to work the way Derpy wanted. And her dang bra was still in the way. Her patience wearing thin, the pegasus mare decided that frankly, being polite could bite her. She pulled the shirt back down and then tore both bra and top open down the middle.

“Hey!” Twilight said, predictably objecting. “Those were expensive!”

“It’s fine they’re not gonna fit anymore anyway,” Derpy replied. That was about all that she had the patience for. Twilight said something indignant in response, whatever. She’d pretty clearly demonstrated that she wasn’t good at this anyway, so Derpy felt confident in ignoring her until she got into it. It would probably help if she provided a little bit of... encouragement. Licking her lips, she reached down and grabbed Twilight’s b-cups, giving them a firm squeeze that was enough to shut the smaller unicorn up.

“That’s more like it,” Derpy said, kneading and groping. Sliding back slightly, she pushed Twilight’s boobs together and leaned down. Somewhat surprisingly, Derpy wasn’t actually very experienced with sucking tits – typically, she was the one getting her tits sucked. Not that it was particularly hard to figure out, mind. In fact, it almost felt like second nature. Probably because it was. Long abandoned childhood instincts kicked in and she began to suckle greedily.

Twilight let out a soft gasp. It kicked in almost immediately, a surprisingly copious flow of milk from her tingling tits. It was an entirely new sensation to her, and it turned out to be one that she really fucking liked. Intellectually, she knew it was just a standard bodily function, no different from eating or sleeping or going to the bathroom. There shouldn’t really have been anything inherently sexual about it unless psychological wires had been crossed at some point. And maybe they had, for all she knew. She wasn’t an expert in the subject, unfortunately. Would have to read up on it. For now, she just enjoyed the erotic thrill of thick, creamy fluid flowing out of her tits and into someone else.

Suddenly, Derpy’s seeming obsession with breastfeeding made a hell of a lot more sense.

Derpy did an admirable job of keeping up with Twilight’s production. Somewhat unsurprisingly, her supply seemed to be bottomless. If anything, the flow seemed to increase, as though her body was fighting a war to see what would be exhausted first; Twilight’s supply, or Derpy’s ability to keep up with Twilight’s supply. That initial trickle quickly became a steady flow which in turn became an overwhelming torrent. Twilight was baffled by how good a job Derpy was doing at swallowing it all down, considering the sheer overwhelming volume. It should really have been impossible – though, then again, her current condition really should also have been impossible. She didn’t want to fall back into that old trap of thinking things that were demonstrably happening in front of her eyes were impossible.

Twilight’s train of thought was interrupted when her breasts began to grow. Right, yes, that was a thing that was also going to happen at some point, wasn’t it? She could feel them getting bigger. Weighing heavier on her otherwise slender and petite torso. It was an odd sensation, one she struggled to describe. More flesh was coming into being out of the aether. Derpy didn’t even have to squeeze Twilight’s tits because the growth did all the work for her on that front. The bigger they got, the more Derpy’s face and hands sank into soft flesh, the better it felt, the faster they got bigger. A vicious feedback loop of more, bigger, more, bigger, more, bigger.

Twilight’s eyes rolled back into her head as she came. And then came again, before her first climax had finished. Her body convulsed wildly as it was wracked by orgasm after orgasm after orgasm. The flow of milk doubled and then redoubled from the already ludicrous base levels, countless gallons of milk spraying everywhere, well beyond what Derpy was capable of keeping pace with – most of it escaped her mouth and soaked the table and floor and probably damaged the machines as well. Whatever. Twilight found herself struggling to give a fuck right now. she’d probably regret her flippancy later, considering she’d wrecked most of her documentation and the relevant machinery. Replicating all of this would be an absolute motherfucker. But right now she was too busy cumming to really give a shit.

She wasn’t entirely sure how long the climax lasted. Probably no more than a few minutes, if she was realistic, but it felt like a few days. Really, she was at the mercy of Derpy – it was only by the pegasus’s graces that she stopped at all. “Holy shit.”

“A good start,” Derpy repeated herself. “Very admirable effort for a first timer.”

“I, uh, yeah.” Twilight took a look at her new endowments. They were huge. Not as large as Derpy’s, of course. But significantly bigger than she’d been expecting. That she was half the size of Derpy’s own torso-dominating pair meant still meant that her own tits were big enough to obscure her god damn belly button. Might probably reached even lower were it not for the fact that they were so god damn overfull of milk that they looked fake, big perfectly round orbs that were still leaking all over the table. “Note to self, the potency is significantly higher than expected. Gonna need to take some notes on this. Mind getting off of me so I can clean up?”

“No.” Twilight opened her mouth to object, but then Derpy flopped forward, tits mashing into Twilight’s in a most delightful way. “No,” she said again, succinctly. “Remember, you owe me. And I’ve gotten really fuckin’ riled up in the meantime so you’ve got your work cut out for you.”

Twilight swallowed heavily. Every time she tried to come up with some sort of response, Derpy did something that washed that response away. Pressed firmly against her, rubbed their tits together, ground her thigh against Twilight’s cunt. “O-okay. Fine.”

“That’s better. Don’t worry about the ladies, by the way. Once things calm down a bit they should eventually shrink back down a bit. Expect C or D cups, I’d say.”

“Okay.”

“Aaaaaaanyway, outta curiosity, what’d happen if you had more of those pills?”

“I would have to test it first, but theoretically it should just simulate a more severe version of your condition. The more a pony took, the, um... bigger they’d get and the bigger their default size would become after shrinking back down.”

“Soooooooo,” Derpy continued, her tone of voice worryingly singsong. “If, say, someone who already had the condition were to take a pill, it’d temporarily make things much... more, yes?”

“Yes, in theory. Assuming this works the way I think it does.”

“Well, what’s the worst case scenario?”

“You mean aside from it working as intended?”

“I mean if it goes wrong. Like, would it kill you or something?”

“I don’t think so, no.”

“That’s all I needed to hear, then.” Derpy reached over and grabbed the pill bottle, realizing Twilight’s worst fears. She probably should have done something or other to stop it, but Derpy had moved further up her torso. And was surprisingly heavy, even taking into account how thickset she was and how unbelievably enormous her tits were.

“Sorry about this, it’s just you kept talking about feeding the world and it gave me some ideas, is all. Bottoms up!”

Twilight reached up to grab at Derpy’s arms before she could do the very obviously not smart thing she was about to do, and failed miserably because her big fat milky tits got in the way and she wasn’t used to dealing with them yet. The pegasus popped the lid off and downed every single god damn one in one fell swoop. “Oh dear,” Twilight muttered to herself.

“Don’t just sit there,” Derpy growled. “Make me bigger.”

“Y-yes’m,” Twilight replied nervously. That was about all the consent that Derpy needed or was going to bother to get. She squeezed her breasts together and leaned over in a way that really should have been impossible given her musculature. Clearly, Derpy was significantly stronger than she looked. She’d hafta be, really, to carry those things. Maybe there was a side-effect of the condition that resulted in increased muscle density? Twilight would have to investigate further, was the last thought she had before Derpy’s nipples reached her waiting mouth.

Derpy was already leaking slightly – though “slightly” for Derpy was still enough to make Twilight’s earlier output look like the good start the pegasus had described it as. The very second that they came in contact with Twilight’s mouth, the flow increased significantly, and as Twilight closed her lips around the fat teats it increased even more. Most of the gallons upon gallons upon gallons of fluid sprayed out of Twilight’s nose and the seal of her mouth, and she’d not begun to suck yet.

The fact that Derpy’s tits seemed to be growling was probably a very, very bad sign, Twilight realized with a sinking dread. She really didn’t relish the possibility of drowning in milk, or else just getting squished beneath tiddy. Well, okay, if she had to pick a way to go, drowning in tiddy would probably be up there, but she would much rather not die at all. She struggled impotently (and somewhat halfheartedly) in an attempt to break free, or at least roll on top of Derpy and eliminate one half of the things making the situation life-threatening.

She failed miserably, of course. Derpy didn’t seem to even notice her anymore, certainly didn’t seem to care. On the one hand, that slight thrill of danger was admittedly a bit sexy but on the other hand she really didn’t want to be squished. And oh Celestia, this was all happening indoors. Of course it was, she wasn’t going to milk Derpy in god damn public. But, well, being embarrassed was a decidedly preferable prospect to Derpy’s boobs outgrowing the library. That would be the insult cherry on the injury sundae of being buried in tit. There was also the equally unpleasant possibility of Derpy not outgrowing the library, instead being squished herself, killed by her own obscene growth.

There was, really, only one solution that presented itself. Or at least only one solution Twilight could think of on such short notice and with some very significant distractions weighing on her mind in an unpleasantly literal fashion. A way to prevent the library from being outgrown, avert any potential squishing of either party, and all it would take is sacrificing her dignity. With about as much of a sigh as she was physically capable of while being forcefully breastfed, Twilight closed her eyes and concentrated as best she physically could. Then, with a flash of bright purple light, both she and Derpy vanished.

A few moments after that, the door to the basement lab opened, and Spike peeked his head in. “Hey Twilight, there were some weird noises and I think I heard swearing? Is everything alright? I-” He cut himself off when he realized that the basement was completely empty. “Huh. Okay then. Musta imagined it,” he muttered to himself, somewhat unconvinced. There was a very visibly obvious mess. Machine’s knocked over, papers scattered everywhere, puddles of an unidentified white fluid that Spike decided he could live without knowing what it was.

He stared at the mess for a few moments, before turning around and closing the door behind him. “Nope.”

Twilight had elected to teleport as far outside of Ponyville’s city limits as she was physically capable of, which was actually fairly far. She was, after all, a magic specialist. She didn’t exactly like to brag, but she was a fairly powerful mage. Of course, the library was still right in the middle of town, so she didn’t get as far out of town as she probably would have liked. But she severely doubted that she’d be able to muster up another teleport spell given the state she was in. She’d used up the last of her focus getting out of the library and into the wilderness on the outskirts of Sweet Apple Acres.

She’d also made a point of flipping their orientation, so that she was on top god dammit. No more danger of getting squished.

No, if she was going to drown in milk it was gonna be of her own volition. And oh man did she kinda wanna drown in milk right about now. The whole situation had left her very thoroughly worked up, and now that there was relatively little danger of dying, she had decided that she was gonna enjoy herself.

Derpy had, in the period of time that Twilight hadn’t been paying close attention, gotten significantly larger. Her starting size hadn’t exactly been petite, of course, so it didn’t actually say all that much that her breasts currently outmatched the rest of her in terms of size. They’d had a head start. Of course, head start or no, it was impossible to deny that things were spiralling out of control. Derpy’s breasts sloshed and gurgled and groaned and grew and grew and grew. Twilight could feel it, a sinking feeling in the pit of her stomach like she was in an elevator that was moving up slightly too quickly. Because she basically was. A steady, rapid rise, up and up and up.

Twilight was having a very hard time remembering why she’d been against this. Had she been against this? She wasn’t really sure anymore. All she knew was Derpy getting big was good and she felt almost compelled to make her even bigger. She suckled eagerly on big fat swelling leaky nips as best as she was physically capable of. She could just barely still fit both teats in her mouth – she wasn’t sure if only suckling on one or the other would make any real difference, and didn’t particularly wanna find out. Instead she did the next best thing and began to treat them like the teats they were. Squeezing and pumping, basically jerking them off like they were a pair of cocks. And, like cocks, they reacted by erupting with thick gouts of milk. More fluid than cum would have been, of course, but the comparison still felt apt.

It also gave Twilight an idea. An eager grin spread across her face as she pulled away from Derpy’s nipples. The now significantly larger pegasus let out a low protesting groan that Twilight was barely even capable of hearing. Whatever, Derpy could protest all she wanted, she just needed to be patient. Hopefully this would count as intimate breastfeeding enough for whatever psychological requirements to keep the pegasus’s boobs biggening.

Twilight wrapped her thighs around one of the nipples, giving it a good solid squeeze and drawing yet more cataclysmic arcs of milk. In retrospect, this probably wasn’t gonna be particularly great for the local environment. It was probably be easier to clean up than the library, though, so fucking whatever. Twilight leaned forward and then slid back, rubbing her crotch against Derpy’s very large and increasingly phallic nipple. “Fuuuuuuuuck.” Twilight honestly wasn’t sure who it was who said that. It could have been both of them for all she knew or cared. She had bigger concerns.

She reached down and grabbed the nipple, holding it steady. It wasn’t as rigid as a dick would have been, so it needed the extra help for her to be able to stuff it into her cunt. The end result was a series of very, very, very loud noises. Twilight wasn’t sure if it was Derpy’s boobs making more sounds of growth, Derpy crying with orgasm, herself crying with orgasm, or some combination of the above. Twilight convulsed wildly, just barely able to remain on top of Derpy as she felt herself get absolutely stuffed, filled to the brim by growing nipple and by milk. Celestia, this had been the best idea. It had also been enough to kick Derpy’s growth into high gear – as though the building-sized tits weren’t already in high gear. Twilight’s vision was washed away by a sea of white as she felt her mind get overwhelmed with thick, creamy milk.

“Are you okay?”

“No.”

Neither mare was really entirely sure how much time had passed. At some point, Twilight had slid down onto the ground, resting near Derpy’s head. Her breasts had quadrupled in size again, and she was very thoroughly grounded by the massive orbs, still leaking and easily bigger than her body. Of course, they still had nothing on Derpy. The pegasus mare’s tits were, at this point, big enough that they couldn’t physically see all of them. Granted, a big part of that was that both of them were immobilized by their fat milksacks, but somehow Twilight got the impression that Derpy’s tits probably weren’t outside of Ponyville’s city limits anymore.

And, naturally, everything was god damn soaked with milk. Literally, everywhere Twilight looked she saw pearls of white clinging to everything. “This is an unparalleled ecological disaster.”

“It can’t possibly be that bad.”

“It’s pretty fucking bad. God, Applejack is gonna kill me.”

“I’m sure she’ll understand if you explain the situation.”

“What, that I decided to make big boob drugs and then you overdosed on big boob drugs and now you’ve got boobs the size of a small mountain?”

“Well, when you put it like that it sounds unreasonable.”

Twilight rolled her eyes. “Come on, let’s just... try and clean up.”

“I don’t think that’s gonna be an option any time soon babe.” Twilight groaned and Derpy let out a soft giggle. “Hey, look on the bright side.”

“What bright side?”

“We didn’t feed the world, but we got a good head start on feeding Ponyville.”