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When morning came the next day, Button's mother found herself filled with a strange sense of clarity and acceptance. And a lot of cum, of course. She was on the floor, with Button's cock still halfway inside her. She knew for a fact she had to be pregnant with his child, even judging by how full she still was. She knew she should have been worried, and that common sense dictate she react a certain way to what had happened. Yet she could not bring herself to care about any of that, about the propriety of any of it. All she could care about was thinking of how things would get from there on out, and wondering just how much more her body and Button's would grow.

Sex became a regular occurrence after that day. No longer a taboo act, now merely another one of the many ways she could go about pleasing her son and relieving him from his painful condition. It was just as well that she'd started to do so, because Button kept getting more and more pent up through the days, only growing bigger as time passed. His balls were past the point of being comparable to any kind of fruit, closer to huge exercise balls and impossible to hide. Thankfully school was closed during the summer, which allowed him to stay home without needing to be confined by too small clothes.

His mother wasn't quite so fortunate, since she still needed to go out for buying groceries and whatever else the house needed. She could feel the stares of everypony in town on her, and she couldn't blame her with the way her body had grown. Her tits were massive and already she could fell them filling up with milk, her hips were wide and they swayed with her every step, and her belly was always bloated to bursting by both the growing pregnancy and the sheer amount of cum she took daily in all her holes. She suspected she had twins, with how large she was.

Not that she wholly disliked the attention though. There was a certain thrill that came with it, a modicum of excitement from being clearly exposed as a fertile mother and even from knowing it was clear who the father of the newly growing life inside her was. Button's condition, impossible to hide as it was, was no secret across Ponyville. His mother could hear the whispers trailing behind her about her fucking her son. They just excited her. Those other ponies had no idea how amazing her little Button was.

His cock had grown significantly since they'd started fucking. It was near double the length it had been, and it was only thanks to her own intake of his magical fluids that his mother still managed to take him. She was always tight and he was always huge, but he wasn't too big and she wasn't too tight, so things worked out. And oh if they worked out. They would go at it nonstop for hours. Her pussy was definitely Button's favourite hole of hers, even if he still enjoyed boobjobs and oral and all other manners of activities between the two of them.

The house was always left a mess after they fucked. That meant it was Button's mother's duty to clean up, while Button himself recovered. She'd do so in the nude, because clothes would just get dirty and because so few of them still fit her growing proportions. Inevitably, the sight would get Button aroused again, and soon the cycle would repeat, over and over until she had to leave or until it was time to eat or sleep. Though they were both eating less and less regular food, as she was eating up copious amounts of her son's spunk and he had started to drink the milk that already was starting to leak from her massive breasts.

It was a few months into this cycle, on a particularly hot summer day, that the two of them began to notice something unusual. Something about Button's mother, and in particular her belly. It was always swollen, of course, but lately it had started to look bigger than usual. It was morning when they noticed, when it should have been at its smallest before it was pumped full during the day. Initially they thought nothing of it, but they kept it in mind. But in the following days the swelling seemed to still be there, and becoming more noticeable, faster than just her known pregnancy should have justified even had she had triplets in her. So, when they eventually managed to get themselves in a state where they wouldn't constantly be fucking, they went for a checkup.

The news came as a bit of a shock, though apparently it wasn't something unheard of. The doctor was very understanding, evidently one knowledgeable in such cases, and he didn't comment on the state of their relationship. He just delivered the results, professionally explaining what exactly was going on.

As a result of Button's magically radiating seed, his mother's pregnancy had mutated into something different. Or, to be more precise, her single pregnancy had become of a set of multiple different overlapping pregnancies.

It was apparently perfectly safe, both for her and for her many children. Her body had started and would continue to magically mutate to accommodate all the new life blooming inside her. Her chest and hips would swell even further to sustain all of it, and her belly would continue to grow. So long as Button kept breeding her, she'd keep growing more pregnant, until she started to give birth and stabilised at a consistent maximum size. Assuming the rate at which she was bred was consistent, of course. She'd effectively turn into a full time broodmother for her son's children.

Button had seemed strangely excited by the news. It was like the prospect of her bearing his spawn actively turned him on, and the idea that he could keep breeding her nonstop seemed particularly arousing to him. His cock had hardened right there, slightly ripping the fabric of the special pants he'd worn for his trip out.

His mother had taken it differently. Less overtly excitedly. But she wasn't put off by it either. It was strange. She guessed she needed some time to think things through, and she'd said as much. Unfortunately for her, that didn't quite prove to be a possibility. Thinking about things wasn't really in the cards for her in her state. Not when, as soon as they got back home, her overeager son began to breed her anew.

She couldn't say no to it or to him. She craved his cock and cum far too much. As soon as he dropped his pants and pulled out his shaft, all her thoughts and worries went out the window. There was only the present, the sex, the base need to be bred. By that evening, Button's mother wasn't so averse to the idea of having multiple simultaneous pregnancies, especially not if it meant being fucked as hard as Button had fucked her that day for the rest of her days.

So, time passed, and the signs of her multiple overlapping pregnancies became impossible to miss. Firstly, and obviously, her belly swelled larger than it ever previously had. Even when it wasn't bloated full of cum from one end or the other, it was impossibly big, jutting obscenely forward and sideways, rounded and dotted with bumps from the many pregnancies in various states of development she was filled with. Between that and the way the rest of her body changed, moving around was starting to become an inconvenience in itself.

To start with, she had to actively squeeze her way through most doors, and soon that would be all of them barring double doors. None of her clothes fit anymore, and she grew at such an alarming rate that she couldn't even buy any. They would all turn out to be too small in just a couple of days. She'd taken to wearing huge uncut swats of cloth around her bust and her legs, a bit like rough togas, though that had its own set of problems.

For one, her tits. They were leaking milk, and not just when pressed or suckled. The combined pregnancies led her chest to swelling, full of milk, so much that she actively heard it sloshing around her overfilled boobs when she moved. It was a painful kind of pressure that made her understand in part what her little Button must have been going through down there, though his balls' production was greater even than her breasts'. It was a good thing that her son liked to nurse on her tits, as it helped relieve some of the pressure building up inside them.

That still meant they would absolutely drench her clothes whenever she was wearing any, leaving the cloth on her bosom practically transparent and only intensifying the amount of stares and whispers directed at her when she went outside on some errands. It also made cleaning the house even more of a hassle, and given how she did so on her knees with her fat ass wiggling that always led to even more of Button breeding her.

She'd thought about getting a maid to help keep the place clean. It was a real possibility, and money wasn't a problem. She was worried about something else though. Not that she'd admit it, but she didn't trust that another mare in their house wouldn't end up like she had. Overtaken by the musk of Button's overwhelming magical virility, and soon sucking on his cock like his mother. She was, even if she refused to say it, a little jealous of her little colt. She enjoyed having him all for herself.

That was most likely why she wiggled her hips at him in the fist place when she was around the house. She was hoping to get a reaction out of him, and she loved getting one. And he loved looking at her, by all means. Especially those hips and ass of hers, and especially with how huge they'd gotten. The former had widened even farther to properly carry the full weight of her multiple pregnancies, and the latter was a match for her enormous tits, a pair of huge and soft asscheek pillows that served as cushions wherever she chose to sit.

Then there were also the changes that were more subtle, if anything cold be subtle about her state, or at least less immediately visible. The mental ones, and the physical ones that weren't as hugely apparent as what had happened to her tits or ass or belly. The former in particular were having a huge influence on her, on her way of living and day to day experiences.

She'd embraced her role as Button's breeding broodmother, but it went beyond a simple acknowledgment that she was as much. It actively shaped her mind and what her thoughts drifted to. More and more she was finding herself thinking about his cock and cum and sex when she wasn't actively partaking in any of them, and even her dreams were shaped around their sexual intercourse and her growing multipregnancy.

The pregnancies too had taken a different look in her mind. The knowledge of them and the feeling of all the subtle and big changes they brought excited her, and made her feel fulfilled in new, amazing ways. She was coming to love her future incestuous children just as she loved their father, and moreover she was loving the act and feeling itself of being pregnant. It hadn't been like that when she'd been pregnant with Button, but then she hadn't been nearly as full or heavy with him.

Goodness was she full and heavy. Moving itself was becoming an act that reminded her of her condition, and with that reminder came happiness and excitement and lust and a craving for more. More sex, more cum, more pregnancies to add to her swollen belly. More of her son's massive, gargantuan cock stretching her pussy and pumping litres of cum inside her womb.

The same went for any attempts she made at exercising. She had to keep in shape after all, yet doing it was a bit of a struggle when every slight bend or yoga pose became near impossible in the face of her newfound proportions. At all times she was constantly reminded of how her life was changing. Every facet of her daily activities was being altered and reshaped around the status as broodmother she had started to develop into.

And yet, despite everything, she was happy. More than happy. She was excited. She actively loved her new condition. It was the best feeling she'd ever experienced, all things considered. The constant feeling of fullness, the constant sensation of arousal, it was all amazing. She was always horny, always looking forward to the next moment of sex, always leaking from her wet cunt. And when the sex did happen, it was amazing.

She was addicted to it. She was addicted to Button, and his cock, and his cum. With how much he'd grown, she couldn't help but be completely enthralled by it. His cock was simply massive, and his cum production had grown exponentially. She was addicted to sniffing his musk, to inhaling his scent, to licking his balls, to drinking his cum, to having him use her every hole to get himself off.

More and more time during her days was spent servicing and pleasing Button and helping him get off. She couldn't help herself. It was just too amazing not to, and he needed it. He needed her, and she needed him. It was all too great. The taste and the smell and the sheer virility he exuded. She would have spent her entire life with his dick in one of her holes if she could have done it.

As it was, she still went pretty close to it. Her and Button would fuck for hours, multiple times a day and often even at night. She was already considering homeschooling him going forward, since it would let her keep him close to himself. Part of her thought that was just a way to make sure she was always available for him to relieve himself, but another knew they'd just end up fucking all the time and ignoring his studies.

Was it really so bad though? Surely with Button's conditions and her own the government might help, as they did with other such cases. Then she could fully devote herself to her son's needs, without any need to go outside and stay away from him. Besides, she would need a lot more time soon, as she'd start to have to worry about both Button himself and all his kids.

That knowledge worried her a little, when she wasn't fully drunk on sex and cum. She wasn't going to give up on her role as broodmother and breeding mare for Button, of course. He needed her, and she wanted him. But would she have time to both look after him and look after all their kids once they started coming? On one hand they would help relieve the pressure in her chest, which was only growing, but on the other she worried about splitting attention between the two tasks.

Thankfully, it was Button himself that ended up coming up with a solution to her potential problem. It was a hot day of late summer, and the two of them were partaking in their favourite pastime. The table was empty despite it being lunchtime, and they were in the living room, eating their meals from each other instead.

Button's mother, lying on her back, had her son's titanic cock stuffing her throat, with her hands on his gargantuan balls, massaging them as if to coax more cum out of them. Button was on top of her gigantic tits, greedily sucking on one of her nipples and drinking up her milk. He lazily shifted his hips, getting a bit more of his cock into his mother's throat. Beside him, her other nipple leaked by itself, spilling milk down her cleavage.

He pulled his mouth off of her nipple with a pop, as his balls tensed under his mother's ministrations, ready to unleash another deluge of cum into her gullet. "Mommy?" he called out, before biting his lip to stave off his orgasm a bit longer.

His mother answered his call. It was unclear what she answered with, as the words came through gargled and messy as vibrations around his shaft. That led him to finally snapping and cumming, flooding her throat and belly with thick white seed that bloated her up even more. It took a while for him to stop, and by the time he was done her face was covered in his spunk.

Finally he pulled his cock out of her mouth and moved to her other end. "I was thinking, you know, this is nice and all, but could I invite some friends over? I think it would be nice to play with them too. Those three fillies I told you about, Apple Bloom and her friends, would that be okay with you?"

And Button's mother thought it was the perfect solution to her problems, as it would allow her to look after her kids while someone else looked after her first son. Then he speared his mammoth shaft in her tight pussy, and all she could think about was sex and cum.