Grass is Greener

by AzureDreamer

Rating: mature
Tags: My Little Pony: Friendship is Magic, Fetish, Bon-Bon, Romance, Sex, Slice of Life, Anthro, Lyra, Porn
Length: 6132

Lyra and Bonbon argue about whose assets are harder to deal with, and then receive a practical demonstration about what life is like for the other. And then they have sex.

Lyra and Bonbon's wedding is coming up, and the stress of wedding prep is starting to get to them. It doesn't help that Lyra's boobs are so big that she can only be up and about for so long. It also doesn't help that Bonbon regularly needs to take breaks to let off some of her excessive libido. Stress is high, and friction is high.

The only solution is for both mares to get a taste of what life is like on the other side.

They swear this isn't just a pretense for sex.

WARNING! CONTAINS ANTHROS, FUTA, BREAST EXPANSION, COCK EXPANSION, ASSET-TRADING, CUMFLATION, LACTATION, AND PROBABLY A BUNCH OF OTHER WEIRD STUFF

cover art by Hyperstorm_H

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

Published 2019-12-20 22:40:01 UTC
Last updated 2019-12-20 22:40:01 UTC

Trading Assets

Lyra had, in the grand scheme of things, not had very long to get used to having breasts the size of beach balls. She was currently in her early twenties, while her glandular disorder had kicked in when she was fifteen. There was no slow but sure process of maturation like most mares had, letting her body gradually adapt to the extra weight on her chest. One day she was flat as a board and then over the course of a month or so she’d become, well, this. So, in addition to all the little inconveniences that came from having breasts as unbelievably huge as hers were, she also had fucking back pains.

Not as often as she used to when she was younger, of course. Over the years she’d managed to build up decent enough musculature to carry the girls without tiring out too quickly. But, well, those early days had probably done some lasting damage. She’d grown too big too quickly, and the rest of her was still playing catchup. If she’d grown at a more normal pace then she’d just have built the infrastructure she needed to carry the girls naturally. But she didn’t and so she suffered the consequences.

She could make up for her body’s shortcomings with enchanted clothing, and she usually did so. But the problem with that approach, one she had come to realize over the years, is that it had further stunted her ability to deal with her breasts without the magical help. As a result, there was just plain only so much time she could spend on her hooves in a day. Just a natural physical reality of her biology.

Some days were better than others. Today had been a not so good day.

And, unfortunately, it was also a day that was barely a quarter over.

“Can we maybe take a ten minute breather, Bons? My back is killing me.”

“We’ve got a lot to do today, Lyra,” Bonbon replied. She couldn’t really be blamed for being terse. Wedding prep wasn’t exactly known for being the most relaxing thing in the world, and they’d kind of been at it for a few months now. Things had started slowly – they’d given themselves a lot of time between the proposal and the actual date specifically so they could take the prep slowly. But, well, the day was approaching and the unfortunate reality was a lot of wedding prep could only be done close to the actual wedding. So they found themselves busy. A lot. Which meant that Lyra had to be on her feet. A lot.

“Okay, a five minute breather.”

Bonbon sighed wearily. “Okay, okay, fine. But once we’re married you’re gonna hafta start living a more active lifestyle.”

“It’s not my fault I’ve got puny unicorn muscles,” Lyra said, quickly grabbing a seat on a nearby bench. “Just gimme a minute and I’ll be good to go, promise.”

“This wouldn’t be a problem if you exercised more.”

“Bons, with all due respect, there are ponies who are smaller than my boobs.”

“Mnh,” Bonbon grunted, before letting out another weary sigh. “Yeah. Yeah, okay, that’s fair. Sorry, I’m just... frustrated.”

“It’s fine,” Lyra waved dismissively. “Besides, it’s not like you don’t have to sneak off to masturbate every five minutes.”

“That’s different.”

“Maybe semantically, but in the end it just means we’re both not able to give our full focus to the wedding 24/7. And that’s fine. That’s why we hired Pinkie to be a wedding planner.”

“We didn’t so much hire Pinkie as she just sort of showed up when she smelled an upcoming party.”

“Same basic difference,” Lyra said with a shrug. “Is she, uh, always like that, by the way?”

“She’s actually calmed down a lot since Twilight moved in.”

“Oof,” Lyra said with a wince. “Uh, anyway. The point is we don’t hafta worry about doing all the work. Share the load and all that, so it doesn’t matter that I’m getting tired all the time hauling the girls around, or that you hafta sneak off to let off a load even though you’re turning me into a Lyrorb every other day.”

Bonbon frowned. “Hey, no need to get passive aggressive.”

“I’m not getting passive aggressive, I just find it weird that we have so much sex and you still hafta sneak off to masturbate.”

“You’ve got your issues, I’ve got mine,” Bonbon snapped, maybe a bit more tersely than was called for. Once again; they were both stressed out. “It’s not like it’s easy having a gigantic dick.”

“At least you can fit through doors.”

“At least you don’t have to worry about being horny literally all the time.”

“At least you don’t hafta worry about long-term back problems.”

“At least you don’t need a crane to go to the bathroom.”

“At least you don’t need a crowbar to get your shirt on.”

“At least you don’t have to spend thousands of bits on magic underwear because it breaks so easily.”

“At least you don’t need to worry about milking yourself.”

“Um,” Bonbon replied. “Actually, isn’t that pretty much what started this argument?”

Lyra let out a snorting laugh. “Okay, fair dos, you do hafta worry about milking yourself.”

Bonbon shrugged, taking a seat beside Lyra. “I don’t know. I guess I just... don’t have any frame of reference for your problems.” She patted Lyra’s boob for emphasis. “Mine are only twice the size of my head.”

“That makes sense. I’ve literally never had a cock in my entire life. Obviously.”

“You’ve had plenty of cock,” Bonbon replied, sticking out her tongue.

“Not what I meant babe.” Lyra shrugged. “I dunno, I guess it’s a ‘grass is greener’ type situation. We’ll never really be able to definitively say who has it harder without spending a day in each other’s shoes.”

There was a brief moment of silence. “You know,” Bonbon said tentatively. “I’ll bet you there’s a spell for that.”

“Probably, yeah,” Lyra replied, blushing slightly as she tried to imagine what it might be like to have a cock as big as Bonbon’s. “I dunno if I could cast it though.”

“Well, we could always ask Twilight for a hand on that front. I’m sure she’d be willing to, uh, help with that. You know, help us settle this little argument and strengthen our relationship and all that. She can call it a friendship lesson.” Bonbon tried her hardest not to imagine having boobs as big as Lyra’s and failed miserably.

“Yeah. Yeah, that sounds like a plan.” Lyra carefully pulled herself upright. “Let’s, uh. Let’s go then.”

“Yes,” Bonbon replied tersely, though for much different reasons than before. “Let’s.”

Golden Oaks Library was, thankfully, not too far. It had a very central location within Ponyville, right in the middle of the town square. Which meant that it was easy to get to no matter where you were in town, and especially if you were already out and about. “So,” Twilight said. “Let me get this straight. Just- just making sure we’re on the same page here. You want me to cast a spell that will make you trade... parts, yes?”

“Yeah, that’s the gist of it.”

“Okay. And you expect me to do it right here and now?”

“I mean, it’d be convenient?”

“No.”

“Oh come on.”

Lyra got herself a stern glare. “Don’t think I don’t see where this is going, Lyra. I would be more than happy to help you experiment with sex magic. In the comfort of your own home.”

“We’re not experimenting with sex magic, this is a friendship problem. I swear.”

“The last thing I need is the library getting... flooded.”

“But-”

“Again.”

“Okay, okay, fine,” Lyra grumbled. “We know where we’re not wanted.”

“I didn’t say that.”

“I just wanna get this over with as soon as possible,” Lyra said. Bonbon, for her part, just shuffled awkwardly in the background.

“Okay, then we can do it now. Just not here.” Twilight seemed adamant on that particular point. “Literally anywhere is fine so long as I’m not the one who has to clean up after you and I’m not the one who has to pay for repairs.”

“If you’re the one casting the spell though then-”

“Then I’ll be the one held liable unless we do it at your place. Which is what’s happening.” Twilight snapped her fingers, and with a flash of lavender light the three mares found themselves suddenly in Bonbon's living room.

“Woah.”

“There we go. Much better. Now,” Twilight said, taking a moment to size the two up. “You’re probably gonna wanna get naked.”

“Oh. Uh. Yeah, that makes sense.”

“Unless you want to outgrow your clothing?”

“No, no, it’s fine,” Lyra replied, though she pointedly did not start stripping. “It’s just... awkward, you know?”

“So you were down with having sex in the middle of the library but taking your pants off in front of me is a no-go?”

“Listen,” Lyra said, though she drew a blank on what she wanted Twilight to listen to. “Just- just gimme a second to get mentally prepared.”

“You don’t have anything I’ve not seen before Lyra.”

“You two seem awfully familiar,” Bonbon injected warily.

“We did go to school together for like a decade or so,” Twilight said with a shrug.

“Oh! Right, that makes sense. I never even thought of that.”

“Yep! We’re about as good friends as anyone was with Twilight.” Lyra leaned close to Bonbon, theatrically covering her mouth and stage whispering. “She was actually a huge social recluse. We had to bully her to ever go out to parties.”

“Lyra don’t make me take your pants off for you because I will and it won’t be gentle.”

“Okay, okay, geeze. No need to get testy.”

Lyra had never been much for fashion, even before her extremely generous puberty. Factoring in her breasts, there just wasn’t much in the way of clothing that fit her. Certainly not anything fancy, especially up top. And it would be weird to wear fancy pants topped off with a plain white cotton tee, so she usually just wore plain old shorts. She didn’t really need to wear anything fancy in order to stand out, though, all things considered.

They also had the benefit of being easy to remove quickly. Her plain white panties followed shortly thereafter, revealing honestly nothing much. She wasn’t completely lacking in the rear, but the stars of the show were decidedly up top. Not that she particularly cared of course. Bonbon was more than happy with the state of her ass, and she didn’t much care what Twilight thought one way or another. She carefully folded her removed clothing and placed them out of the way. After a moment to think, she decided to remove her top as well – earning her a Look from Twilight. “Look, we all know where this is going, you said so yourself. I just happen to like this top.”

“It’s a white t-shirt.”

“It’s a nice white t-shirt. Besides, I meant the bra. Support enchantments are expensive and it’s dry-clean only.”

“Fair enough. Bonbon, your turn.”

“O-oh. Right, okay. One moment...” Bonbon tended to be marginally more fashion conscious than Lyra, which granted wasn’t saying much. Today, she was wearing a simple pink sundress that matched her hair, along with somewhat sexy underwear. Not necessarily by choice, mind, though she always liked the way that wearing lacy racy stuff underneath her clothing made her feel. But enchanted underwear was expensive and thus tended to be nice. Especially considering that the only local option for any kind of enchanted clothing was Rarity.

Her bra came off first, unleashing her girls on the world. They weren’t nearly as impressive as Lyra’s, of course. But, discounting that (along with a handful of other exceptionally enormous outliers), she was one of the most well endowed mares in Ponyville. She saved her panties for last – removing concealer panties was typically a bit of an ordeal, especially when you were horny. And, well, horny was kind of Bonbon’s baseline state of being. Plus Lyra was naked not a few feet away.

She slooooooowly shimmied them down her thighs, a fraction of an inch at a time. Ideally she’d have gone much faster, of course – she very much wanted to get to the good part. But, well, going from zero cock to three and a half feet of cock in an instant had a habit of breaking panties if you weren’t careful, especially if you went too quickly and even moreso if you were erect. “Gnhaaaaaa~” she groaned as her shaft let out a good few gallons of precum directly into Twilight’s face.

Twilight seemed thoroughly unimpressed. “Gee. Thanks.”

“Sorry,” Bonbon muttered, doing her best to angle her still leaking cock away from Twilight.

Twilight sighed. “It’s... It’s fine, it’s not your fault. Just be more careful in the future.”

“Okay.”

“Anyway! Now that you’re naked, we can move on to phase two!”

“There’s phases to this?”

“Yes. Shut up.”

“Why are there phases?”

“Do you want me to do this or not?”

Lyra rolled her eyes. “Yes, I want you to do this.”

“Then there are phases.”

“Fiiiiiine.”

“Phase two! The actual spellcasting itself.”

“Wait, hold on,” Bonbon interrupted. “Don’t you need to look a spell up or something?”

“No, I can just cast it.”

“Off the top of your head?”

“Don’t judge me.”

“Why do you know a spell to switch ponies’ endowments around off the top of your head?”

“Don’t judge me.”

“Okay, okay, we’re not judging you!” Lyra said, raising her hands defensively. “Just cast the spell.”

“Okay.” There was another flash of lavender light, and then nothing. “There we go, it should kick in shortly and last about three hours or so.” She waved at them, turning to leave. “I’ll be in the kitchen if you need me.”

“Hey, we didn’t say you could have any of our food!”

Twilight poked her head out of the kitchen. “You know, I could still un-cast the spell~”

“Fine, whatever, just don’t eat everything.”

“Thanks! Have fun, you two~”

“See what I mean about being a social recluse? I’ve got no idea how she’s managing to maintain so many friendships these days.”

“She’s definitely... eccentric,” Bonbon said, maintaining a diplomatic tone. Mostly.

“She’s a weirdo.”

“Well, she’s a weirdo who’s giving us a hand. For free. So I’m not gonna complain.”

“You’re out of hayburgers!” came a should from the kitchen, prompting an exasperated ‘oh my god’ from Lyra.

“Soooooo... It should be kicking in any second now?”

“Yeah. Kinda wish there was a bit more ceremony to it, if I’m honest?”

Bonbon shrugged. “I don’t really mind it being unceremonious. I just wish it were a bit quicker.”

“Wanna get to the good bit?”

Bonbon blushed furiously, pointedly not looking at her cock. “A little bit, yes.”

“Well, clearly Twilight did something so all we can do is wait for it to kick i-oh!”

There was a tingling sensation. Lyra felt it concentrated in her chest, while Bonbon felt it concentrated in her crotch. The cream coloured mare let out a soft gasp as her arousal abruptly spiked. She had already been horny as fuck, but that arousal skyrocketed into mind-numbing pleasure. Which was weird, really. If her cock was gonna get smaller, why did it feel so good?

Not that she was gonna complain about things feeling good, of course. She collapsed forward onto her knees, face coincidentally landing squarely in Lyra’s cleavage. Typically one of her favourite places to be, though right now she was a bit distracted by the fact that she was cumming. Copiously. That was the baseline for all her orgasms, of course, but this time was very obviously different from her baseline orgasms. She could feel the inches melting away. The weighty presence of her cock getting less and less weighty by the second, like she was literally cumming out her size.

She wasn’t the only one, of course, who was getting less endowed. Lyra seemed to be having a decidedly less orgasmic time of it, though the way she squirmed against Bonbon indicated that it was only slightly less orgasmic, probably because it wasn’t her primary sex organ that was being effected. Bonbon instinctively reached up and grabbed Lyra’s boobs to steady herself as she kept on cumming, only to find herself missing entirely because they had shrunk, significantly. She quickly readjusted her aim and successfully grabbed Lyra’s boobs, feeling them get smaller in her hands. She felt a sort of instinctive disappointment welling from the depths of her soul, poetically speaking. Lyra’s boobs were huge and it was undeniably tragic to make them not be huge.

Bonbon took some amount of solace, at least, in knowing what was coming up next. Yes, Lyra’s boobs were getting smaller. And yes, her own cock had at this point almost dwindled away into nothing. But that was, unless Twilight had messed up, very quickly going to be rectified with other things getting very much bigger.

Eventually Bonbon just stopped having a cock altogether. It was a weird, alien sensation. She wasn’t entirely unfamiliar with not having a penis – it wasn’t all that different from wearing concealer panties. But the fact that she wasn’t wearing concealer panties, or even any panties at all felt wrong. Not bad, but wrong. The fact that she kept on climaxing for a few minutes after it vanished probably helped mitigate that. She took a further minute to collect her senses, flopping backwards onto her butt. “That was... that was intense.”

“Yeah, uh. Yeah. It was.” Lyra blushed slightly, gesturing behind her. The wall and floor and much of the furniture were very thoroughly coated in Bonbon’s seed. The earth pony blushed furiously. “You kinda made a huge mess.”

“Oh, um. We can clean that up later, I guess.”

“I mean, it’s not like we’ve not made huger messes in the past,” Lyra replied with an awkward shrug. “And we’re absolutely gonna be making an even bigger mess when all this is done.”

“Yeah, I guess.” Bonbon took a brief moment to collect herself before shakily standing back up, unsteady on her feet. Looking down, she was once again hit by the complete lack of a cock. She was so very thoroughly used to it just being there whenever she was naked that she had a hard time wrapping her head around it not being there. Part of her unsteadiness was likely the result of her climax, but an equal part of it was almost certainly the sudden shift in her weight changing her centre of gravity.

She was not the only one having issues on that front, it seemed. Lyra was equally wobbly on her feet. She at least still had breasts at all, but they had still shrunk by more than half. She’d gone from breasts that completely dominated her torso to only twice head-sized. “Wow,” she muttered to herself, doing some quick stretches. “This feels kinda good, if I’m honest? Like, uh, a weight off my chest. Literally. I can move a lot more freely, too.”

“Hm. I guess I can see that being a benefit.”

“What about you?”

“It feels weird. Like... I dunno, I’m so used to it being there and now it’s not. I guess if I had to look on the bright side, I’m having an easier time focusing on this conversation than I might have otherwise with you standing there naked. My mind’s not just immediately wandering to sex.” She paused for a moment. “Well okay no. That’s a lie. It’s more just... different. Kinda struggling to put words to it.”

“Well, hey, you don’t gotta put words to it,” Lyra replied with a gentle smile, placing a hand on Bonbon’s shoulder. “That’s kinda the whole point of this, yanno? We don’t need to describe what it’s like with words because we can feel it. It’s all about the experience.”

“That makes sense,” Bonbon said, crossing her arm around her fiancee’s and placing it on Lyra’s shoulder. After a moment, she placed her other hand on Lyra’s other shoulder and pulled the mint coloured unicorn into a hug. It was surprisingly nice – they’d never really been able to manage a hug quite this close before, considering Lyra’s endowments. There was still a buffer, of course. In spite of the shrinkage, they were both still very well endowed. Fat tits twice the size of their heads mooshed together in a decidedly pleasant way. But normally if Bonbon wanted to kiss Lyra she had to slide into her cleavage or approach from the side. With the changes to their figures, she found her face inches away from Lyra’s. “Well, then, why don’t we get to experiencing?”

“You read my fuckin’ mind, babe~” With that, they closed those remaining few inches and kissed. Bonbon enjoyed it, she decided. It was nice to not have to worry about the logistics of makeouts and instead just fucking make out. Their naked bodies pressed tightly together, arms entwined and wrapped tightly around each other, pulling their naked bodies closer and closer together. They pressed against each other, breasts rubbing against breasts and nipples against nipples. Lyra, acting on instinct, slid a thick thigh in between Bonbon’s legs. The earth pony quickly realized a significant benefit to her own current state; before, that would have just resulted in her getting kneed in the balls. Now, though, she felt her moist pussy press against Lyra’s leg, and quickly returned the favour as they began grinding in earnest.

Grinding, it turned out, felt really fucking good. It wasn’t necessarily better than her cock. But she was so used to sex being one way and now she was experiencing an entirely different kind of pleasure, one she’d never felt before. So of course it felt well beyond what she was used to – because she was used to what she was used to, to use redundant and confusing wording. Whatever, she was enjoying herself. Her body felt hot, and was getting hotter. Lyra’s thigh was suddenly soaked in fluid, and getting more soaked as she leaked. And of course Lyra wasn’t left out of the pleasure, as Bonbon felt her own thigh also getting soaked with the unicorn’s femcum, and a familiar sensation of moistness against her chest as Lyra’s condition began to kick in.

Except really, it shouldn’t have been kicking in, should it? She didn’t pretend to understand the exact mechanics of the spell that had been cast on them, of course, but she was fairly sure that if they were going to trade assets, that meant Bonbon should have been the one with the hormonal condition resulting in extreme lactation when she got horny.

As if in response to that sudden realization, Bonbon’s boobs abruptly doubled in size.

She flailed slightly, the sudden extreme change in weight throwing her off balance before knocking her off her feet completely. She fell forward, taking Lyra down with her, pinned underneath the abruptly titanic tits. “Woah!”

“Mrph!”

“Yeah, hold on, let me just...” Bonbon made a valiant attempt at standing up, but failed miserably. Her breasts were just plain too fucking big. Disregarding the significant weight, she physically could not reach the ground in order to push herself off of Lyra. “Um... We might have a bit of a problem.”

“Mrph.”

“How do you even manage this?”

“Mrph!”

“That’s not really very helpful right now, dear.”

“Mrph!”

“What are you even talking abou- oh!”

Lyra didn’t need to respond, not verbally at least. Bonbon received a very tangible reminder of exactly what Lyra was talking about.

Where Bonbon’s boobs had expanded very abruptly, Lyra’s cock decided to take its time. She would have preferred a bit more warning and some more breathing room, but given the way Lyra was squirming and moaning beneath her she began to reconsider. She could feel it prodding at her navel, inching its way higher and higher. She could feel it getting bigger and thicker beneath her, slipping its way into her cleavage.

“... Well,” Bonbon said, biting her lip slightly. “I mean, we were going to fuck anyway and your dick is right there.”

“Mrph!!!!”

Bonbon ignored Lyra’s objections. She barely even registered them. Her mind was too busy being consumed by the sensation of her marefriend’s growing cock in between her own absurdly massive tits. She reached down and pressed her arms into their sides, and was rewarded with a spike of pleasure and a spurt of milk. “Ahn!” she moaned as she began to rub her body up and down against Lyra.

“Oh fuuuuuck,” Bonbon groaned. She could feel Lyra getting bigger and bigger in between her tits, growing in uneven spurts of size that were accompanied by copious bursts of precum. If she didn’t know her own biology, she would have assumed Lyra was climaxing. She might very well have been, for all Bonbon knew, but she was fairly certain that this was just the beginning. It didn’t really make much of a difference one way or the other, as far as Bonbon was concerned. Cumming or precumming, it was still bulging and pulsing and growing against her tight cleavage until the fat flared head popped out into her face.

Lyra’s cock was a slightly darker shade of the same blue-green as her fur. It glistened with moisture, and was in the process of producing even more moisture. Bonbon was now certain it was precum – she could tell by looking at it. But a layman would almost certainly have assumed it was a proper climax given the sheer volume. Thick gouts of slick, translucent fluids painted Bonbon’s face and the wall and furniture and just about everything in sight. It was a familiar scenario, except usually she was the one painting the house white. That strange disconnect from before returned in full force. Here she was, faced with a massive cock sandwiched between enormous boobs. She’d been in this exact position a thousand times before (she and Lyra had a very active sex life in the past few months or so since the engagement).

And yet it wasn’t her cock and it was her boobs. That alone felt deeply and profoundly wrong, albeit not in a bad way. She gave Lyra’s flare an eager lick, and was rewarded with an increase in the flow of precum and a muffled groan of encouragement – albeit one tinged with undertones of ‘Bonbon please get off of my face I can’t breathe’ which the earth pony didn’t particularly appreciate. It wasn’t like she didn’t try to get off of Lyra’s face, after all. Wasn’t her fault she couldn’t manoeuvre herself around her new endowments.

Still, as much as Lyra smacking against her boobs felt really good, she couldn’t really justify not making another attempt at this point. “Okay hold on I’m gonna roll.”

“Mrph!”

“What do you mean rolling is a bad idea?”

“Mrph!!”

“Look, I don’t hear you suggesting anything so I’m gonna roll.”

Bonbon hefted herself over to the side, and immediately regretted it as she found herself pinned under her boobs.

“I warned you.”

“Shut up and help me up! Or fuck me! One or the other!”

“Mnf, gimme a minute,” Lyra grunted. “It’s kinda hard to manoeuvre around this thing. How do you manage it?”

“Presumably the same way you manage to stand up at all,” Bonbon replied, attempting and utterly failing to at least lift herself into a sitting position if nothing else.

“Years and years of building upper back strength by lifting the girls,” Lyra responded. “Which you don’t have, which is why rolling was a bad idea.”

“Getting grounded at all was a bad idea,” Bonbon replied, as though she’d had any choice in the matter.

“You could have at least sort of... Propped yourself up on ‘em.”

“Well, at least you’re out from underneath me now?”

“I guess. Hold on I’m gonna try and stand up.”

Standing up was probably not as difficult for Lyra as it was for Bonbon, but it was still a bit of an ordeal. Mostly due to the way every single movement jostled her cock and balls. Both were, of course, gigantic. She’d had plenty of experience seeing them on Bonbon, but having them on herself was a different matter entirely. Her balls reached to her goddamn knees and her cock was bigger than her torso, and both were constantly on the verge of exploding. She moved slowly and carefully, in the desperate hope that she wouldn’t set herself off early, and mostly succeeded. Mostly. She still let loose a lot of precum in the process. “Oof. Okay, I can see how this thing can get to be a nuisance after a while.”

“At least you can stand up,” Bonbon replied. “How are we even gonna fuck? Can you get at my, uh, bits?”

“That part would be much easier if you hadn’t rolled over. Like I told you not to, by the way.”

“What was I supposed to do then!?”

“Stop titfucking me for like five seconds so I could use my magic to lift you a bit?”

“... Oh. Right.”

“I tried to warn you, babe.”

“Ugh. Whatever, help me roll back over so we can get to the good bit.”

“Gimme a sec.” Lyra needed a second to gather enough focus to do anything at all, much less enact the kind of fine control magical required to do telekinesis. Bonbon wasn’t exactly light – Lyra knew for a fact because those were sort of her tits and they weren’t exactly light. There were probably foals lighter than Bonbon’s chest right now, and Lyra had never been the best at telekinesis. It took a significant amount of focus to move something as heavy as Bonbon was right now, and unfortunately Lyra was currently dealing with some... significant distractions. Or, rather, one singular big distraction.

“Any minute now.”

“Hold on I’m trying to concentrate.”

“Concentrate faster I’m horny.”

Lyra gave a sharp hissing “shhhh” as her only response, closing her eyes and trying really hard not to think about her dick or Bonbon’s boobs. Unsurprisingly she failed miserably, but she at least managed to get her horn to light up just long enough to flip Bonbon over. “Okay. There.”

“Hey, are you two doing okay?” Twilight said from the kitchen. “You’re taking an awful long time and there’s a lotta shouting.”

“We’re fine, Twilight. Thanks for asking,” Lyra responded, though her tone of voice indicated that no they weren’t really fine and that she didn’t really appreciate the interjection. “This is just harder than it looks, is all.”

“Would you like a hand?”

“We’re fine.”

“If you’re sure. You’re out of eggs by the way.”

“Wh- why are you eating our eggs?!”

“I made pancakes!”

“I...” Lyra elected to cut the conversation off there. The main event had been delayed long enough, as far as she was concerned, she was too horny to worry about Twilight eating them out of house and home. “Okay. I’m gonna put it in. Uh, eventually.”

“Lyra hurry uuuuuuuuup,” Bonbon moaned pitifully, wiggling and writhing helplessly on top of her engorged chest. Her ass jiggled enticingly, and the way her legs were splayed slightly by her tits left her juicy cunt exposed. Lyra swallowed heavily at the sight, and she could swear she felt her cock twitching bigger and harder. As though it somehow wasn’t even properly fully erect yet. Not that she minded it getting bigger.

In fact, she specifically very much didn’t mind it getting bigger.

Lyra once again swallowed heavily. She’d been staring, she realized. That wouldn’t do at all, not when she should have been fucking. Taking another brief moment to regain concentration, her horn lit up once again. This time, the golden light of her magic enveloped her cock, holding it steady and aiming it at the ultimate prize. “I’m gonna put it in,” she said.

“About tiiiiiiiiime!” Any coherent thought either mare might have had was very quickly obliterated as Lyra’s monster entered Bonbon’s eager embrace. It felt very very good. Neither mare had any experience with this particular kind of sex. Sure, Bonbon had used a dildo before, but never anything near her own massive endowment. And Lyra outright was completely unfamiliar with having any kind of penis, much less a three and a half foot one. The way Bonbon’s insides squeezed and groped and milked her was unlike anything she’d ever experienced before.

She did her best to not cum immediately, and to her credit she managed to hold back for almost a full minute. Only almost a full minute, though – her lack of experience in having a cock meant she also lacked the ability to hold back in the slightest. Her hips thrust, once and then again, this time deeper, before the third thrust brought her to the hilt. “F-fuuuuuuuuck!” she moaned in time with her climax.

If there was one thing about the current situation both mares were used to, it was the sheer volume of output. Even this, however, was twisted into something new and different and alien. Bonbon was thoroughly used to being the one doing the filling, not the one being filled. Her belly swelled from the sheer amount of cum Lyra was pumping into her, to say nothing of the stuff spraying out of her, coating her ass and the underside of her tits and Lyra’s hips and thighs and the floor and just about everything else in reasonable reach. That Lyra’s hips kept right on thrusting through all of this only served to make it worse. Bonbon let out a wordless, strained noise of blissful arousal as her breasts started to grow. Filling with volumes of milk as impossible as Lyra’s output, if not more. Enough to easily keep up with the amount that Lyra’s thrusting and Bonbon’s own bodyweight squeezed out.

And, of course, it just kept going. Far from being over quickly due to Lyra’s lack of stamina, the virility of her new manhood meant that if anything her quick trigger resulted in an even more copious orgasm than otherwise. Most of it ended up on the floor – Bonbon was only capable of containing so much. But her growing breasts and Lyra’s equally growing balls more than fucking made up for that, lifting both of them off the ground. The mint green unicorn flopped forward onto Bonbon, ample (though slightly less-so than normal) breasts pressing into her fiancee’s back even as her hips continued to go.

Bonbon wasn’t entirely sure exactly how long it lasted. She never really was, even under normal circumstances. Time tended to melt together into a vague blur of fucking and cumming. Eventually, though, Lyra... Didn’t stop, but at least slowed down a bit for a moment. And, of course, Bonbon found herself rendered just about as gravid as she always left Lyra, with breasts bigger than her entire body in spite of the copious amount of milk that had mixed in with her fiancee’s cum. “Holy shit.”

“Yeah, uh. Yeah. Is it always like this for you?”

“Yeah.” Bonbon struggled to form coherent sentences, and she got the impression that Lyra wasn’t having an easier time of it. “So, um. Do-do you think we’ve got time for round two?” she asked, blushing furiously.

“I, uh, dunno. Maybe? It’s not like round one’s done yet, we can probably try though.”

“You’ve got about an hour left,” Twilight interjected, sticking her head out of the kitchen. “You guys really went at it. I’m almost impressed in a weird sorta way.”

“Whatever,” Lyra said, having long since given up on making sense of Twilight. “Could you give us an extension, in that case?”

“Yeah, sure,” Twilight replied with a shrug and another lavender flash. “Done. Try not to hurt yourselves by fucking too hard, okay?”

“I make no promises.”

Twilight rolled her eyes. “Okay, but I want it on the record that I’m completely blameless in all of this.”

“Suits me just fine,” Bonbon said. She mostly just wanted Twilight to go away.

“Oh, by the way, you’re out of milk.”

“It’s okay,” Lyra said, reaching down and rubbing her fiancee’s gigantic tits. “We’ve got plenty where that came from.”

“Ew. Ew! Oh man, please don’t tell me you actually bottled your own milk!”

“I’m not not gonna tell you that.”

Twilight gave final “ew” before ducking back into the kitchen. Lyra smiled smugly. “Serves you right,” she muttered to herself, before turning her attention to Bonbon.

They had a lot of getting used to their new endowments to do, after all.