Gadget Hackwrench was having a day. She wasn’t entirely sure whether it was a good day or a bad day just yet, but it was certainly a day. She currently had mixed feelings about the situation. On the one hand it was fascinating, but on the other she didn’t know what was causing it which was worrying. There were several things it could be, but she didn’t know enough yet to narrow it down to one. The other Rescue Rangers were all off on a mission, which meant she didn’t have anyone to help her figure out what was going on.

It also meant, however, that there was no one to see her completely lose control of herself, masturbating furiously in the middle of the base. No need to worry about privacy, the boys were gone and wouldn’t be back for a few days at the earliest. She could clean up after herself later. Right now she had needs that needed tending to. She writhed on the ground, slender fingers rubbing needily against the crotch of her increasingly tight purple jumpsuit. Her other hand gently teased a swelling breast, the attention prompting her chest to lurch bigger. There was a long, loud riiiiiiiiiip as her jumpsuit finally failed. Her tailhole acted as the point of failure, rapidly extending to cover most of the back – or, rather, to not cover it. The culprit; her ass, soft and round and huge. Gadget had always had fairly significant badonk, noticeable even through her (under normal circumstances) modest fashion sense. But this went well beyond junk in the trunk, more like a shipping container loaded with dumpsters. She, somewhat obviously, could not get a good look at it, given her position, but the fact that it was big enough to cause her clothing to rip was telling, especially considering how ample her chest was.

Of course, not content to be left behind, her tits immediately lurched larger again, the teeth of her zipper making loud snapping sounds as it was forced down by her colossal mammaries. “M-mngggg~” she groaned, roughly yanking the white tank top she used as an undershirt down to unleash the girls on the world. They were so fuckin’ sensitive that they’d have hurt if it didn’t feel so fucking good. She immediately dedicated both hands to forcefully squeezing and groping at her assets, while her slender tail snaked its way down through her round asscheeks and up the other side to take up the mantle of tending to her needy cunt. She only briefly let go of her tits to grab her jumpsuit and pull it the rest of the way open so that her tail could get more easy access. It slid its way into her swiss cheese print panties – which didn’t used to be a g-string but it sure as fuck was one now – and began to eagerly pump in and out of her hole, firmly pressing against her also swollen clit as it did so.

That insertion was enough to push Gadget over the edge. She erupted in a way that she never had before and that she wasn’t even aware girls could erupt. Feminine fluids rocketed from her puss with enough force that her panties didn’t even slightly slow the flow. She bucked and convulsed and grew, her sleeves and leggings slowly sliding up up up, revealing more and more of her forearms and calves, and then her upper arms and thighs, and then just outright disintegrating into nothing.

She wasn’t entirely sure how long her orgasm lasted, not exactly being in the state of mind to keep track of time. But it was intense. Well beyond anything she’d experienced before in her life. She sprawled on the floor – taking up much more space than she had when she’d started. Her larger chest heaved up and down in time with her heavy breaths. “G-golly,” she managed to exhale after a moment of recovery. “That- that sure was something.”

Gadget took another moment to recuperate (and bask in the afterglow) before reluctantly deciding to get up and take stock of the situation. She slowly rolled over and pushed herself upright – and was rewarded with another cataclysmic series of riiiiiiiiiips as the rest of her jumpsuit failed to stand up to her standing up. Every seam burst, and then burst some more as soft mouseflesh forced its way through every available opening, forcing them wider and wider until they tore completely. By the time Gadget was halfway upright, the jumpsuit was in shreds. “Aw, man. I liked that outfit,” she muttered as she finished standing up. “Golly, I’m almost touching the ceiling! How much bigger did I get?”

Gadget made her way to her lab proper, ducking and awkwardly bending sideways to get through the doors on the way. The base just wasn’t built with someone her current size in mind. Mice normally didn’t get much larger than four inches, tops. Thankfully, someone had the foresight to build the base with exceptionally high ceilings, so she at least wasn’t hitting her head, but moving was still difficult. Eventually she settled on crawling. Not exactly dignified, but at least there was no one to see her on her hands and knees, arms squeezing her ample chest together with her fat ass wiggling in the air as she moved. And god she was still fuckin’ horny. It felt like the slightest thing could set her off once more, and frankly it was a miracle she wasn’t reduced to a quivering mess before getting to the lab.

Once there, she could more easily take stock of the situation. Her undershirt was still intact, sort of, but covered exactly nothing as a result of her earlier playing with her tits. Her panties, too, were just adequate enough to have not been snapped by motherly mousehips. Other than that, she was effectively completely nude. She swallowed heavily as she took in her larger body. Her tits had to be the size of her head, and her asscheeks were half again as big. She blushed slightly, yanking her hands away from her butt. Now really wasn’t the time to get lost in pleasure again. The last time she’d let that happen, she’d doubled in size. Or she was fairly sure she’d doubled in size – she towered over just about everything in the lab, at least. Still, she was a methodical mouse, and wanted to be certain. She grabbed a pencil and a book, both of which were unsettlingly tiny in her hands, and stood as straight as her ass allowed against a nearby wall. Measuring the resultant mark got her a height of about 15.24 centimetres, or six inches exactly. Twice as tall as she normally was, matching up with her earlier estimate.

“Fascinating,” she muttered to herself, pacing back and forth in thought as best as she was capable of given how much more space she took up. “But what on earth could have caused this? Professor Nimnul? Or was it something I did?” She found herself leaning towards the former rather than the latter – if only because she was very reluctant to admit that both possibilities were equally plausible, and that she was just as likely to be at fault as the actual mad scientist. “Well! I’ve got a few days to figure this out and reverse it. Maybe I can even find some use for it. Doubling the size of a living organism has a lot of applications – would that be octupling the mass? Hold on, I’m going to have to go do some calculations, maybe find a scale...”

Gadget puttered around her lab, intensely focused on solving the mystery of her abrupt growth. This was her element. She had a problem – she had doubled in size with no apparent cause – and no readily apparent solution. She busied herself on taking various measurements and doing calculations, losing herself in the science. It turned out that she had more than octupled in mass. Unsurprising, considering certain parts of her had grown out of proportion to the rest of her. “Where on earth did all of the extra mass come from, though?” she wondered out loud. She had a longstanding habit of voicing her thoughts out loud when she was particularly absorbed in some project or another. And she was very absorbed in this particular project, enough that she almost forgot how sensitive her tits were, the needy heat between her legs, the mounting tightness and building need. “It had to have come from somewhere, but- hm, going to have to take some more measurements. Golly, I wish I had nicer equipment. But I guess they don’t exactly make state of the art lab tech in mouse sizes. Hmmm, maybe I can improvise. I’m gonna need duct tape, a screwdriver, and a broken toaster- Ow!”

Gadget had a worrying tendency to get a bit too absorbed in her work. So absorbed that she completely tuned out her surroundings. Which became a problem when she started to also completely tune out herself. In the past, it had resulted in her forgetting to eat or sleep or bathe or all of the above. And, right now, it resulted in her not noticing that she was growing again until she bumped her head on the ceiling of her lab. She found herself abruptly collapsing backwards – thankfully, her rear had sufficient cushioning that the fall didn’t hurt, but it was still mildly undignified. And her head absolutely did hurt. “Owie...” she muttered as she rubbed the sore spot. The pain was enough that she wasn’t nearly as overwhelmed with arousal as her last growth spurt, though it was still noticeably there. Just not debilitating.

Her head wasn’t the only thing that hurt. Her panties were painfully tight, as was her tank top, the increasingly inadequate clothing digging deeper and deeper into her swelling curves. “Mnf,” she groaned, frowning slightly. Now that she’d noticed, she wasn’t entirely sure how she’d gone long enough without noticing that it had gotten this bad. And she couldn’t just tune it out again, not considering she was too big to stand up without hitting her head. And, disregarding that, she found the building discomfort at the forefront of her mind. Even if she weren’t rapidly getting too big to fit in the base, she doubted she’d be able to get her mind off of it. And she was going to need to be able to focus if she was going to fix this.

And fixing this was getting increasingly urgent. She had not been too worried by her first growth spurt. Six inches was far larger than the base was built to take, but there was at the time no evidence that it wouldn’t stop there. But now, with concrete confirmation that her growth wasn’t going to stop at just six inches, she could no longer safely assume it would stop at all. Which meant that suddenly, outgrowing the base was a very real concern – she already found herself too large to fit through the doors. Which, in turn, meant that stopping and reversing the growth was suddenly her highest priority.

And the first step to that was to regain her ability to focus. She reached up and grabbed the tank top. Removing it the traditional way quickly proved to not be an option. Her earlier decision of pulling it out of the way was once again biting her in the ass – her tits had gotten too big for the garment to fit over. So instead she did the next best thing and removed it more directly. It didn’t take much effort on her part – the top was already straining to stay intact anyway, and her increased size seemed to also come with increased strength. It tore away easily, ripping along the seams and falling loosely aside. She wasn’t nearly as bothered about losing her shirt as she had been about her jumpsuit. It was, ultimately, just a tank top. She had a bunch more that were identical, so this particular one wasn’t the biggest loss. She could live with one less tank top.

She was a bit more concerned with her panties. She only had the one cheese patterned pair, and dammit it was cute. Still, while not quite as impossible as her top, she was somewhat resigned to not being able to remove them without destroying them in the process. They felt tight, tighter than her top had been. She very briefly paused to contemplate how odd that was, considering she was fairly certain her ass was smaller than her tits, but her mind was rudely dragged back to the topic at hand. They dug deep into soft, round flesh and stretched to just under the breaking point. If she waited a moment she supposed that they would just break on their own once the next growth spurt hit, but she was hoping to shrink herself back down before hitting another growth spurt. With the way the floor was creaking and groaning underneath her increased weight she wasn’t sure the base could handle another growth spurt.

Reluctantly, Gadget pulled her hands away from molesting her chest again – she hadn’t noticed that she’d begun to grope herself, which was mildly worrying – and moved to remove her panties. She attempted to hook her fingers underneath them, but they were stretched far too tightly for that to be possible. She frowned slightly. At this point she was invested in keeping her bottom as intact as possible, dammit, even if it was probably stretched beyond the point of being able to wear it at her normal size. It would help, she supposed, if she could see them, but her enormous tits were firmly preventing that.

“Well, I can probably fix that if I just...” She shifted herself as best as she could, given how much room she found herself taking up. She shifted and shuffled and eventually managed to get herself into a position where she could see her crotch.

Of course, once she had, she found herself kind of wishing she hadn’t.

“Oh. G-golly. Well, uh, I guess that explains why they were so much tighter?” She stared, dumbfounded, at the enormous penis her body had apparently elected to sprout. She wasn’t exactly experienced with cocks, but she’d caught enough accidental glimpses at the boys’ over the course of living with them that she could fairly confidently guess that it outsized all of them by a good margin. Which made sense, considering that at this point she had to be about a foot tall, bigger than even Monty. But even proportionally speaking, it reached the undersides of her (admittedly enormous) breasts. She didn’t have the world’s biggest sample size, but she knew the statistics off by heart – she knew a lot of statistics by heart – and could tell just by looking at it that it was big. It stretched her panties significantly, well beyond the point they could be salvaged, staining them translucent with copious fluid flow. And, of course, there was a pair of fist-sized testicles to match. She wasn’t really sure how she’d not noticed them considering the way her panties dug into the sensitive spheres, forming respectable ball-cleavage.

Gadget swallowed heavily. This was an... unexpected development, and not an unwelcome one. Which, really, was a bad sign. She had absolutely no idea how much more mouse the base could handle, and the growth spurts had shown no signs of stopping. She needed to focus on fixing this, and already the cock had severely distracted her from that goal. “Okay. Focus, Gadget. Need to focus. Get back on track.” Getting up wasn’t an option, but luckily her ruler and notes were within arm’s reach – though the latter was far too small relatively speaking for her to use. She’d just have to rely on her impeccable mind.

Using the ruler proved more difficult than she had thought, what with her being too large to stand up. Eventually she reluctantly settled on guesswork – the ruler was about as long as she was tall, and that meant she was probably around 30.48 centimetres, or exactly one foot tall. It tracked, given the previous growth spurt, but she still disliked the lack of precision. “Okay. Clearly my next priority should be getting out of the base.” She was, quite simply, too small to be able to effectively use her lab anyway, and she worried that another growth spurt might result in her outgrowing the base entirely. Or, worse, that it wouldn’t result in her outgrowing the base entirely. She really didn’t want to dwell on the possibility that the base’s structural integrity might hold up longer than her body’s.

Unfortunately, she probably should have thought of that before the second growth spurt. Getting to her lab had been an ordeal while six inches tall. At this point, she almost certainly didn’t fit through the door. If she wanted to get out, she was going to have to get creative. And, unfortunately, it was hard to get creative when she was so distracted. She had, after all, not dealt with her panties. They were still painfully tight on her much larger than normal ass, and still providing uncomfortable stimulation to her cock and balls. And oh, now that she’d noticed her cock and balls she couldn’t seem to get them out of her mind. No matter how hard she tried not to think about it, she found her attention and hands constantly wandering their way back to the thick mousemeat. It was just so needy, so hot and hard and big and full.

“Well, um,” she muttered to herself, a deep blush spreading across her cheeks. “I guess that if I want out of here I’m going to have to, um, deal with the distraction.” Her blush intensified. “It couldn’t hurt to give it a little attention, right?” she justified to herself as her hands wandered southwards. “What’s the worst that could happen? Don’t answer that.”

Her hands danced, just barely not grabbing her cock. Moments ago she’d struggled to keep them away from it, but now that she wanted to touch it she couldn’t quite bring herself to go those last few centimetres and grab it. To feel its masculine girth underneath her dainty fingers. The hot flesh pulsing and throbbing as she stroked and squeezed and pumped, coaxing out load after load after load of hot sticky mousecum. More and more, bigger and bigger, never stopping until she was satisfied and never being satisfied until she got more.

Gadget didn’t even manage to work up the nerve to grab her cock before her whole body convulsed, hips bucking wildly as her shaft erupted with enough force that her panties snapped. That was enough to shake her out of her indecision, and her hands quickly grabbed the monstrous meat, steadying it as it came and came and came. Not just ropes of cum but a steady solid stream of constant output. She wasn’t sure whether it was one big orgasm or if her eruptions were coming in such quick succession that it might as well have just been one big orgasm and frankly she didn’t fucking care. All that mattered was how goddamn good it felt to cum and cum and cum. Her hands moved eagerly up and down, squeezing as tightly as she could. Which wasn’t very, as the copious bulges of seed that travelled up its length kept pushing her grip looser in the most delightful way. Her hips bucked, rising and falling in a steady rhythm that matched her orgasm. They rose up up up and then came crashing down onto the creaking, groaning floor of her lab with increasing force as she grew again.

“Oh fuck oh fuck oh fuck,” she stammered as she realized what was happening far too late to even attempt to stop it. “No no no no no, stop! Go back! Bad bad bad!” She spoke, somewhere between desperate please and cries of ecstasy. In spite of her desperation to stop, her body had other ideas. One hand continued to pump at her shaft, while the other moved up to tend to her tits. Her tail joined in, quickly taking up its earlier position of tending to her cunt as a makeshift living dildo, pushing poor gadget further and further and further over that edge as though she wasn’t already in freefall. And oh god did it feel good.

Assuming that the pattern that had been established by her first two growth spurts held true, Gadget was probably around two feet tall at the moment. Of course, she had no way of knowing for certain that the pattern had held true. Her longest ruler was only a foot long – that was about as big as could fit in the base, given it was built for mice. The tallest of the Rescue Rangers was still only four inches tall and Gadget was significantly larger than six inches at the moment, and only getting larger. Standing up was well beyond out of the question. She could barely even fit in her lab, given all the stuff that was also in the lab. All of her lab equipment had been roughly shoved to the sides of the room by the sheer force of her expansion, and a small part of her hoped nothing had been broken. A larger part of her knew that was the least of her worries and she probably needed to rethink her priorities.

The biggest priority was the fact that she was rapidly running out of room in the Rangers’ base for her increasingly large form. She felt her feet pressing against the far wall, while her back pressed up against a different wall, her body curling up against itself because shockingly the room she was in was built to be spacious for someone an eighth of her current size. She was absolutely certain that she could probably not fit a single foot through the door, let alone her entire damn body. And that was bad because if she had another growth spurt there was a very real chance that the base’s structural integrity would outlast her body’s.

Which would be very very bad.

It didn’t help that her contorted posture left her cock wedged rather dangerously against her boobs. She wasn’t quite titfucking herself – her endowments were impressive, but they weren’t quite that impressive just yet. But they were absolutely touching which made it very difficult for Gadget to concentrate on anything besides her dick. It had, at some point, stopped cumming, though she’d not really noticed. She was having a hard time parsing her surroundings at the moment in general, really. But it was still very ready and eager for round two, and Gadget was having a very hard time holding back from jumping right into that. She had to hold back, though, because again; there was the very real possibility of being crushed by not quite outgrowing the base fast enough.

Of course, on the other hand, maybe jumping right into that wouldn’t be the worst idea in the world? The last time she’d given in and masturbated it had prompted a growth spurt, and an explosive one at that. And it had also made the floor and walls audibly strain to contain her climactic convulsions. If she could coax out an even larger climax from herself then there would be a very good chance that the combination of her greatly increased weight and the throes of her pleasure would be the straw that broke the camel’s back, proverbially speaking, even if it didn’t cause her to grow again.

That was probably not the soundest of logic, of course. She wasn’t exactly thinking straight at the moment, and it was very likely she was subconsciously looking for an excuse to jerk off again. But on the other hand, she didn’t exactly find herself suggesting anything better to herself and she was really fucking horny.

Gadget shifted her body, wiggling and stretching in an attempt to get into a more comfortable jerking position. She failed miserably, of course – there just plain wasn’t the room for her to get comfortable. She could barely move her arms at all. But, then, that was actually a good thing, wasn’t it? With every movement her body made, incidental or intentional, she could hear the structure of the base audibly object. She could feel the boards that made up the floor and walls bending dangerously around her body. Like it was struggling against her raw size and slowly but surely losing the battle to contain it.

God, something about that was super fucking hot.

Gadget groaned as she wrapped her hands around her shaft once more and began to slowly pump. And then not so slowly pump. Faster and faster. She could no longer thrust her hips – there simply wasn’t enough room for her to make large movements at all – but she could wiggle them, flexing her legs and back and everything else she could meaningfully flex as best as she was capable of. And with every motion she made she could feel the battle turning further and further in her favour. The part of her mind that still clung to rationality felt mild annoyance that this patently terrible plan was actually sort of working.

But it was only sort of working. The boards bent, but they didn’t break. She didn’t quite have the mass behind her for that just yet. Which surprised her. She wasn’t exactly in the mental place to do the exact calculations, but she was eight times taller than normal which would certainly translate to significantly more than eight times heavier. The base had apparently been built sturdier than she’d expected. She wasn’t really sure how she felt about that, but right now her highest priority was getting out before she got seriously hurt. She picked up the pace of her already furious masturbation and tried to focus less on escaping and more on the moment. The sensation of her hands on her cock, of her arms pressing into her boobs, her balls being gently squeezed by her thick thighs, her tail pumping in and out of her cunt. The heat. The pressure. The building weight.

“Yesssssss,” Gadget hissed in spite of herself as she once again began to grow.

The lab immediately made its objections known. It could barely handle a two foot tall Gadget Hackwrench. A four foot tall one was absolutely not even within the realm of consideration. Well beyond what the structure was built to contain. “Oh golly oh golly oh golly,” she muttered breathily as her movements became more and more irregular. She could feel her orgasm, building and building and building even as her body slowly curled in on itself as she rapidly ran out of room. A mounting pressure, a heat, intense tingling sensation at the base of her shaft. Climax was moments away. She could feel it.

Unfortunately, this time around she didn’t manage to reach climax. There was a loud, sharp crack as the branch the base was built on snapped, sending her and the base alike plummeting to the ground. The structure shattered from the force of the collision, practically exploding, and Gadget found herself sprawled on the cold dirt of the park. “Owie...” she groaned for a second time as she slowly pulled herself into a standing position. She quickly checked herself over, but wasn’t too worried – the fall had been cushioned by the base, and anyway she was very generously padded all over. Still, she wanted to be absolutely sure she hadn’t broken any bones. Arms seemed to be fine, head seemed to be fine. Feet, legs, tail, ass, tum, tits, cock – at this point, she realized, she was no longer checking for injuries, and doubted wholeheartedly she ever really had been. But what fucking ever, she’d been right about to cum when the base had fallen. Circumstances had left her with a nasty case of blue balls and she wanted to rectify that as soon as possible.

“Mnggg,” she groaned, taking a moment to stretch. It felt good, after being trapped in such a confined space, to be able to move freely. It hadn’t exactly been confined for very long, of course, but she still felt stiff and cramped, and taking a moment to work those kinks out felt surprisingly good. Which, she supposed, probably had a lot to do with the aforementioned blue balling. Even as she stretched, Gadget found her hands wandering their way back to her most sensitive areas.

There was a part of her, somewhere deep beneath the arousal, that was screaming with all its might that this was bad. That she needed to figure out a way to stop and reverse this before she got any bigger – or worse, before some other side effects began to kick in. She’d already grown a cock. Who was to say that was the only mutation lined up for her? What if she hurt someone? What if she hurt herself? What if, god forbid, she was contagious? That small part of her shuddered at the numerous possible ways this situation could deteriorate.

Gadget pointedly elected to ignore that part of her, at least for now. It had a point, but honestly was a bit of a buzzkill. Maybe after she dealt with more pressing issues she could focus on fixing this. Though, really, she was struggling to remember why she was so intent on fixing it to begin with. What was there to fix, really? Nothing came to mind. Getting big felt good. And she was really big. Four whole feet! Sixteen times taller than she normally was, to say nothing of the insane amount of overall added mass. She was bigger than literally every other member of the Rescue Rangers combined. Hell, her cock was bigger than literally every other member of the Rescue Rangers combined!

And she was only gonna get bigger. She could feel it. Some deep, instinctual knowledge that this wasn’t done. It was only just beginning. God, if the pattern kept up then next was eight feet. Four was already well beyond huge, for a mouse. Eight? Eight was practically unfathomable. She had no frame of reference for eight feet tall. Anything much larger than she was right now started to blur together. Most humans, even at their largest, didn’t reach eight feet tall. But she would, and immanently, too. It was only a matter of time and that was so fucking hot she practically came right then and there. She took a shaky step backwards, and then another and another until she found her ample backside colliding with the tree that had once held the Rescue Rangers base. It used to look so big, to her. It still was big, relatively speaking, but it was so much less big in comparison that she could barely wrap her head around it.

At some point she had begun to masturbate again. Her cock was just big enough that one hand wasn’t quite adequate enough, but she wanted to squeeze her tits as well. Gadget was no stranger to wistfully fantasizing about having an extra pair of arms or two to get more things done, but usually that was prompted by labwork and not wanting to squeeze her tits and grope her ass and play with her womanhood and jerk off all at the same time. Still, she couldn’t help but wish for at least one extra pair of arms – or, better yet, an extra pair of arms attached to someone else.

God, that would be nice. Masturbating felt good, but she suddenly found herself desperately wanting to fuck. To breed. To stick her big fuckin’ cock in someone else and pump them full’a babies. Or to have someone stick their big fuckin’ cock in her and pump her full of babies. Or both. She could practically see it happening right now, her mind wandering into a colourful sexual fantasy while her body picked up the pace. Her tail wrapped itself around her shaft, freeing up her hands to squeeze her tits. In reality, her hips thrust against thin air, but in her mind her hips were thrusting into a cute girl’s tight cunt.

Dimly, Gadget registered that the girl in her fantasy looked an awful lot like her. She’d never pegged herself for a narcissist, but at the same time she couldn’t really bring up anything in her mind that was hotter than she was now – aside from maybe if she was bigger. “Mnnn, biggerrrr,” she cooed, jerking off harder as she felt that mounting orgasm return.

“Hello? Are you okay?” Gadget just barely registered the voice. It was, she supposed, a human who heard the branch breaking and misinterpreted Gadget’s sounds of pleasure as someone who had fallen out of the tree. That rational part of her brain once again flew into a panic – someone was gonna see her.

The rest of her mostly saw the voice as a potential hole to fill with cum. Not that it mattered. It was far too late to worry about finding someone to fill with seed, at least with this particular orgasm. The bushes rustled and parted, as whoever was talking poked their head through and was smacked directly in the face with Gadget’s climax.

Gadget wasn’t sure whether it was the arousal that prompted the growth, or the other way around. She had grown without cumming, and came without growing, but she had this instinctive sense that the two were somehow related. It went beyond mere coincidence – the growth felt good and that made her horny. She was certain that the growth was altering her biochemistry and ramping up her libido, or that her extreme arousal was somehow triggering a heretofore undiscovered biological process that resulted in the growth. Of course, there was also the increasingly likely possibility that this wasn’t quite so easily explained. That whatever was causing this wasn’t something Gadget was even capable of understanding. By all rights the way she was growing should have been impossible – where was all the extra mass even coming from? She didn’t have an answer to that question. She doubted she could have answered it at the best of times.

And this was decidedly not the best of times. Her mind was, understandably, preoccupied at the moment. She’d lost track of how long her orgasm had been going on for while she was distracted with pondering the science behind her situation. It had likely been a good while, considering the state of the unfortunate human who made the mistake of checking on the crashing sound in the middle of the park. Gadget hadn’t really bothered to get a particularly good look at them, and now they were so thoroughly coated in cum that she honestly couldn’t tell what they looked like underneath it. They coughed and sputtered, holding their hands up in a futile attempt to block some of the semen. Gadget couldn’t help but smile lazily as she witnessed a physical testament to how virile she had become. And she wasn’t even done yet!

Gadget wiggled slightly, comfortably wedging the tree into her butt as she leaned more heavily on it. Her legs barely felt like they had the strength to keep holding her upright, and she didn’t particularly relish falling onto her butt again, even if it was significantly less catastrophic. Plus, this let her put a little more focus on aiming. She giggled to herself as she used her tail to angle the shaft down a bit. That giggle quickly transitioned into a high pitched squeaky moan as she realized that she had to aim down to keep hitting the human in the face.

The human who, just moments ago, had been bigger than her. Gadget couldn’t really make an exact estimate – neither of them was standing upright. But if she had to guess, the size difference had to have been very nearly completely reversed by now. Idly, her mind recalled that the average human was about five feet nine inches tall. She was, once again, not exactly in a state of mind for doing complex calculations, but a quick and dirty estimate based on their rough relative heights would put her at juuuuuust below eight feet. Gadget let out another soft moan as she wriggled against the tree, relishing in the sensation of it sloooooowly moving against her body as she inched taller and taller. Dimly, she regretted letting herself get distracted by inconsequential thoughts about the mechanics of her situation, so that she missed most of her latest growth spurt. She resolved to do her best to not allow that to happen again as she slowly felt herself approaching what she estimated to be eight feet.

And then she hit eight feet.

And then she kept going.

If anything, she felt like her growth was speeding up. The tree she was leaning against groaned in futile protest against her increasing bulk, but did an admirable job at not snapping even as it was slowly consumed by her growing ass. Gadget’s knees gave out, and she dropped down to the ground. She quickly moved to adjust her aim, only to realize she had finished cumming at some point. Her mind was a vague haze of need and arousal and bigger. Once she started paying attention to her growth, it became almost impossible to think of anything else unless she got distracted by an orgasm, and vice versa.

Which was probably why it took her so long to notice what was happening to the human.

Gadget’s eyes moved on their own, following the line from her cock to roughly where it was pointing. The human had stopped struggling.  They stood, looking dazed and disoriented, like they’d forgotten what was happening. Or at least as dazed and disoriented as was possible given their facial expression was completely covered in cum. They opened their mouth as if to speak, but all that came out was a needy moan. Her tongue lolled out, licking at the cum that coated her face as a grin slowly spread across her face. Her? Her. Now that Gadget looked at her, she seemed to have noticeable curves beneath the goo. She started work on scooping up her coating and eagerly consuming it. Of course, she could only go so fast considering there was so much and she was so tiny.

Gadget pulled herself upright, briefly relishing in the fact that the human just barely came up above her knees, before flopping down heavily so her face was directly in front of the smaller figure – once more taking a moment to relish in the way the ground shook as she landed. “Here,” she said, grinning widely. “Let me help you with that.” It was Gadget’s turn to stick out her tongue, slowly licking the cum off of the woman from bottom to top. She tasted really fucking good. Satisfied, the massive mouse pulled back slightly to get a better look at the interloper.

What she saw was enough to immediately cut through the arousal and drag her back into lucidity.

“Gee, uh, thanks for the help, but I was kind of enjoying taking care of it on my own,” said the person who might have been a human at one point but clearly wasn’t a human anymore – instead, she was almost completely identical to Gadget in every way except the vast difference in size. “Though I guess there’s lots more where that came from.”

The former human looked up at the much larger original. “Woah, uh. G-golly, you’re big. Please, um, please don’t eat me.”

“The, uh, the thought hadn’t even crossed my mind.”

“Oh, that’s a relief,” said the second Gadget, wiping her forehead of sweat that wasn’t really there. More of a reflexive gesture than anything else, and one that caused her to look down. Her eyes widened as she caught sight of her chest. “Woah! Those definitely weren’t there before!”

Gadget could definitely believe that Gadget Two had not originally had breasts, or at least not breasts of that magnitude. The incredibly overtaxed white t-shirt she was wearing was almost certainly not built to contain them. She also wasn’t wearing any kind of bra, made abundantly clear by the way Gadget’s saliva had rendered the shirt translucent. The massive orbs, easily twice the size of her head, pulled the bottom of the shirt up and away, revealing her brown-furred tum. It was a very nice tum, Gadget thought to herself, though that was probably a bit narcissistic of her. It was tight and trim and slender, with just enough padding to still be soft, before flaring out into hips so wide and an ass so massive that it had torn the seams of her jeans, brown-furred thighmeat oozing out.

From there, Gadget’s eyes inevitably found themselves drawn to the sizable bulge in the crotch area of her jeans. That lucid part of her once again found itself dragged kicking and screaming into the background, its objections and concerns thoroughly ignored. Right now, Gadget had other things on her mind. They weren’t very large, at least not right now, but she had a feeling that would be changing very soon.

The smaller Gadget, of course, was similarly distracted by the larger one. It took her a moment to even notice, but once she wrenched her eyes from the bulge in Gadget Two’s jeans and back to Gadget Two’s face, it was very clear that her line of sight was very directly pointed at Gadget’s own unconstrained penis. “Golly, you’re big.”

“All the better to breed you with,” Gadget said, and then immediately regretted it. Far, far too corny.

“Are you kidding?” Gadget Two said. Her eyes widened, and her voice seemed to change slightly. Like she was a different person speaking using Gadget’s voice. Presumably, the larger mouse supposed, the thought of having to take a penis that was very nearly as large as she was had been enough to briefly bring back whoever she originally was. “That thing’s huge! I couldn’t take that, it’d kill me!”

“Well you’re just gonna hafta get bigger then, duh,” Gadget replied. “While we wait, why don’t you breed me for a bit?”

“O-oh.” And just like that, she slipped back into character. “W-well, um-”

Gadget didn’t bother waiting any longer for a response. She reached down and grabbed the smaller mouse’s overstressed jeans. It felt almost like undressing a fashion doll, considering the vast size difference between the two. Of course, typically when one removed the pants from a fashion doll, one didn’t do so by effortlessly tearing them in half. And doing so certainly wouldn’t typically reveal tight-fitting boxers strained by a massive fucking cock. They were, much like her jeans had been, completely inadequate at dealing with her womanly hips and massive ass and giant fucking bulge. It took almost no effort on Gadget’s part to tear them off, fully unleashing the smaller mouse’s shaft.

It was not, strictly speaking, all that big. Not from Gadget’s perspective, at least. Proportionally it was, much like everything else about Gadget Two, exactly Gadget’s equal except scaled down significantly. That scaling down was a problem, though, leaving it far too small to satisfy the larger mouse.

Of course, that was only temporary. Gadget attempted to stand up but decided against it – she was tall enough that doing so would result in hitting her head on the tree branches above, so instead she turned her body around as elegantly as she was capable of without standing up (which wasn’t very elegantly at all). She lowered her torso, pressing against the ground with her ass in the air – and then, after a moment’s thought, lowered her ass also to give her much smaller partner more easy access.

Of course, even then Gadget Two seemed to struggle. Gadget’s butt was just so fucking huge that the relatively minuscule mouse was practically consumed by the cheeks before she managed to even get close to Gadget’s cunt. And once she did, it took some finagling to get herself in there. And even when she did manage to get it in, the bigger Gadget barely even felt it. That was going to have to be rectified at some point, but for now, Gadget was resigned to dealing with her own needs. Gadget Two let out a surprised yelp as Gadget Prime unceremoniously flattened her with ass as she rolled into a sitting position and began to jerk off.

“Mnfff, you’re gonna hafta make up for the lack of size with some enthusiasm,” Gadget groaned as she stroked her cock. She could already feel another orgasm mounting. The scientific part of her idly wondered where all this cum was even coming from. Along with the growth, her body seemed to be gleefully defying several laws of physics and biology at the same time for no apparent reason. That would likely have been the most fascinating part of the whole situation to her were it not for the aforementioned impending climax. That specific thing took up most of her attention.

Though a good portion of it was also dedicated to enjoying the sensation of Gadget Two wriggling beneath her. Arms sinking into her ass, legs pressing against her full balls, cock thrusting deeper and deeper and deeper into her depths as the smaller mouse finally began to grow. “Oh yesssssssss, took you long enough~”

Gadget writhed in pleasure as she felt herself filled up more and more and more. She went from barely aware there was a cock inside her at all to oh so very delightfully filled. And then beyond that as the smaller – though by a significantly lower margin than before – mouse began to cum, copiously. The volume easily matched Gadget’s own climaxes, more than even her sixteen foot tall frame could take. As much as went into her hungry womb, an equal amount splattered copiously against her balls and thighs.

But what did go in was more than enough. She knew, on a deep, instinctive level, that Gadget Two’s seed had taken. More than taken. She could feel it. And then soon afterwards she could see it. Her belly slowly swelled with new life, bigger and bigger and bigger.

The small remaining rational part of Gadget’s mind flew into a blind panic. She was pregnant and the father was apparently herself! That was almost certainly not good in the long run. To say nothing of how fast the pregnancy was progressing. Mice weren’t exactly known for their long gestation periods, but it still typically took about a month. Not seconds. It ballooned outwards, quickly pushing her cock out of her grip and forcing it downwards. Not that Gadget minded – she was perfectly content to give herself a belly rub.

So she did just that, placing her hands on her abdomen and delighting as it stretched beneath her fingers. Her boobs, of course, also grew. If she was gonna have a litter she’d hafta be able to feed them, after all. Thick streams of milk flowed down her chest and her fecund belly, dripping down onto the forest floor. Gadget moaned – she couldn’t fucking help but moan. This whole situation was so fuckin’ hot. Dimly, the rational part of her mind questioned whether there was anything about this she’d been particularly attracted to before it had happened to her, but she elected to ignore that part of her because it was a bit of a buzzkill. Instead, she focused on gently pressing against her full womb, hoping to maybe feel the stirring of her offspring.

She didn’t feel that. What she did feel was something that was, frankly, wholly out of left field.

“... Eggs?”

It was really the only explanation she could think of. Hard, ovoid shapes that remained perfectly still, no kicking or motion. It was either eggs or she had spontaneously generated rocks inside of her. The former made much more sense than the latter, though really she wasn’t entirely sure either made that much sense. Still, it was hardly the most unusual thing to happen to her tonight – possibly a very close second to somehow turning some random passerby into a clone of her with her cum.

Thinking of her clone, Gadget Two seemed to have stopped both cumming and growing. Gadget slowly pulled herself up and off of her clone – who had gotten much larger, though was still the smaller of the two. Eleven and a half feet. The number sort of popped into Gadget’s head out of nowhere, which was odd but also unsurprising. And honestly probably accurate, given it was about double her estimate of Gadget Two’s initial height. The smaller mouse lay on the ground in a daze. Her sizable breasts heaved, rising violently up and down in time with heavy, ragged breathing. Her cock heaved similarly, twitching and throbbing and spewing copious amounts of cum, though relatively speaking these were just the last dregs of her dwindling climax. Her balls throbbed visibly as they quickly replenished the spent supply in preparation for the next round. Gadget couldn’t help but grin as she took in her smaller doppelganger. They were no longer exact duplicates – Gadget Two lacked the visible symptoms of pregnancy that Gadget one had. But if anything that just made her hotter.

Grinning wider, Gadget reached down and gave Gadget Two’s big fat balls a gentle but firm squeeze. The smaller mouse responded immediately, letting out a bellowing cry and a fresh gout of cum and then another and another. “Oh, golly, so wasteful,” Gadget scolded before sliding forward and clamping her mouth over Gadget Two’s swollen cockhead, enveloping her shaft with her leaky tits. The transition from ball-squeezing to titfucking was so smooth and perfectly practised that Gadget almost found herself thinking she’d done it before.

“Oh fuck,” Gadget Two moaned, reaching down and grasping Gadget by the ears. “Oh fuuuuuck I think something- aaaaahnngggggg I think something’s happeninggggggg~”

That was probably Gadget Two’s second growth spurt. If it followed the general trend, it would almost certainly make the clone the bigger of the two. Gadget initially felt a pang of jealousy – she’d just started getting used to being bigger than most people. Ideally she’d be bigger than everything. She certainly didn’t approve of her clone being bigger than her.

But then the pang of jealousy was followed up with a pang of something else. A short, sharp pain accompanied by a splash of wetness behind her balls. Waves of pressure, somewhere between pain and pleasure. A heat. A tightness.

Gadget reared her head back, Gadget Two’s cock popping out of her mouth with a wet noise. Her face was splattered with streaks of white cum that ideally woulda gone into her stomach. But she didn’t really care that it wasn’t. She had higher priorities. Something very big, well beyond her counterpart’s cock, began to force its way through her feminine passage. “Ohhhhh yessssss,” Gadget hissed as she began to lay the first egg.

It felt good. Gadget was surprised by that. She wouldn’t have thought it would feel good, but it did. Likely that was the result of wires getting crossed as a result of the unusual goings on. It reminded her greatly of the sensation of Gadget Two’s cock going in but in reverse, which made sense in a weird sort of way. Certainly it was enough to push her over the edge of orgasm. She screamed, pressing her body into her clone – the pressure was enough to push Gadget Two over the edge once more, in spite of the fact that her last orgasm hadn’t finished. Gadget didn’t really care all that much, all it meant was that her face got a bit more thoroughly coated in mousecum. She was much more interested in the sensation of laying. Every convulsion of her cunt pushed the egg further and further out of her body, the massive oval shape pressing heavily against her fat balls, coaxing more and more seed from her cock and into the dirt below. It felt so big, like something that by all rights shouldn’t possibly have been able to fit inside of her or get out of her.

But, well, her body had defied possibility so many times today anyway that Gadget didn’t even question it, instead focusing on how good it felt and on how good the coming growth spurt was going to feel. She screamed as the first egg finally left her body, rolling down her cock and onto the ground in time with a sharp spike of arousal and a lurching surge of size.

The second egg came much easier than the first one. Possibly the initial lay had stretched her a bit, allowing her to more easily accommodate the second. Or perhaps it was the fact that over the course of laying the second she doubled in size (again). Idly, Gadget noticed trees getting shoved aside and uprooted by her latest growth spurt, which was hot as fuck. There only seemed to be two eggs for now, though she could already feel more beginning to brew. Apparently being eggnant was just going to be a constant state for her from now on? Honestly she couldn’t see a downside.

The eggs were each about twice the size of her head – which was impressive considering her head had grown since she laid them. Gadget pulled herself into a sitting position to better admire her work, crossing her legs to encircle her soon to be born offspring.

“Hey!” Gadget Two shouted up with minor indignity. “You said you’d breed me! Come on, I wanna be a momma too!”

“Of course, of course,” Gadget replied warmly, patting her lap. “Have a seat!”

Gadget Two didn’t need to be told twice. She eagerly climbed over Gadget and impaled herself on the larger mouse’s rod. “Ahng!” she cried, writhing and wriggling in Gadget’s lap as the massive slab of meat quickly filled her with precum. “Gonna be a momma! Gonna get big!”

Gadget smiled and stroked the child’s hair. She was enjoying the sex, to be sure, but at the same time her attention was divided. The big, off-white ovals she had produced twitched and bulged as they began to hatch, and of course Gadget wanted to pay attention to that. And, as established, she was currently having difficulty dividing her attention. She didn’t wanna miss her next climax or growth spurt. She didn’t wanna miss pumping this little slut full of babies. She certainly didn’t wanna miss her own babies being born – uh, again.

Luckily, she only had to worry about the latter for a moment. The hatching happened quickly – the eggs cracked and then (relatively) small mice pushed their way out through the resultant holes. They were, very unsurprisingly, more clones. Smaller than either Gadget or Gadget Two, but still easily bigger than the average human. About ten feet tall or so, Gadget estimated. Surprisingly large for what were technically newborns, though they didn’t look like newborns. And they certainly didn’t act like newborns. One of them immediately grabbed the other’s cock and started jerking her off – not exactly something newborns were known to do. “Now, girls,” Gadget said sternly. “You’ve got to eat before you can play.”

“Yes, momma,” the twins said sullenly, like they’d been scolded and not ordered to suck on Gadget Prime’s tits. They quickly clambered their way over Gadget Two, latching onto Gadget Prime’s still-leaking nips and suckling eagerly. The one on the right began to masturbate, while the one on the left shoved her cock into the space between Gadget Prime’s body and the underside of her tit and began to thrust wildly.

“Mnnn, good girls,” Gadget cooed even as the twins began to grow. Of course they did, that made much more sense than just about everything else that had happened so far. “Drink aaaaall momma’s milk and grow up big and strong and biiiiiig~” God, it all felt so good. Almost overwhelming, really. She wasn’t quite being stimulated from every available angle at once, but she was only one hole short of that. Or two, she mused as she considered the possibility of anal. But she was still being assaulted from four angles at once. Gadget Two rode her cock enthusiastically, the twins sucked and fucked more and more eagerly at her fat tits with every inch of growth, and she could feel more eggs forming within her swelling, pregnant belly.

And beyond all that, something more. Something bigger than anything that had came before it. A pleasant warmth. The feeling of impending growth but moreso. It kept building and building, and rather than reaching a breaking point and growing her body remained exactly the same size while the pressure mounted. It was enough to push her over the edge and pump Gadget Two full of hot, fresh mouseseed. She barely even noticed – not for lack of trying, but that impending growth spurt was so intense she could barely feel anything else at all. Gadget Two cried in her own orgasm even as her womb filled with her own brood of eggs, hot white cum arcing into the air and crashing down on top of a gathering crowd of human onlookers. What panic there presumably was quickly vanished as they began to transform into yet more Gadgets, pulling off their clothing and descending into an orgy. Gadget Two herself slid off of Gadget Prime’s fuckstick, writhing on the ground as her own eggnancy rapidly progressed to term. The twins let go of Gadget’s nipples with a wet pop as they both came, painting Gadget Prime’s tits with their own copious output. They, too, collapsed off of her body and quickly set about attempting to work out the logistics of fucking each other pregnant at the same time. It all seemed to happen in a vague fog, and Gadget felt a brief pang of regret that she couldn’t quite appreciate all that was happening.

Of course, she had her own concerns at the moment.

“Momma? Are you okay?”

Dimly, Gadget’s conscious mind registered one of the twins inquiring about her wellbeing. Only dimly, though. “Mnn, girls, you all might wanna get out of the way,” she said – practically moaned. “I think- oh, golly!” Her body let out a deep, rumbling noise. “I think something big’s coming. Something very big.”

Once again, whatever reactions the various gathered Gadgets had to Gadget Prime’s obvious impending growth spurt were mostly lost on the larger mouse. She could vaguely register the twins attempting to roll Gadget Two away, and the gathered orgy of increasingly large Gadgets making an attempt to scatter without actually stopping the orgy. Kind of amusing, but Gadget couldn’t really appreciate it given how overwhelmed she was with her impending growth. Which, pointedly, still hadn’t happened yet. It just kept compounding. Like there was more of her than there was actually room for yet, and if her body didn’t make more room soon she’d burst.

Gadget really didn’t relish the prospect of bursting. “Ohhhhhh, hurry uuuuuup,” she moaned to herself, though it seemed like the lesser Gadgets interpreted it as directed at them. Mild scuttling turned into mounting panic – which, to be fair, wasn’t unjustified. Gadget had no idea how big she was going to be getting, but clearly this was going to be significantly above and beyond any of her previous growth spurts. It would certainly have to be, considering how it was making her feel. If it weren’t massive, it would be a bit anticlimactic. All this anticipation for nothing.

Of course, it was taking its sweet time to actually fucking happen at all. She was almost getting mad at how there was all this buildup and no fucking payoff. Intellectually she knew that it wasn’t something she had any control over. It wasn’t like her body was intentionally teasing her or anything. But, well, it had been a while since her intellectual side was in the driver’s seat. She writhed and groaned on the ground, reaching up and giving her boobs a squeeze. She was rewarded with twin jets of milk and another spike in arousal and not with growth. “Mngggg,” she groaned, moving her attention to her pregnant belly. Even bigger than the last pregnancy. Almost certainly more eggs than before. Which, much like the growth, were pointedly not coming out. “Fuuuuuuuuck!” Gadget attempted to reach down to tend to her cock, but found that her pregnant belly had pushed it out of reach.

“Momma?” said one of the twins, who had both tentatively returned to their mother’s side. “Are you going to be okay?” said the other one. Or possibly the same one. Gadget didn’t really bother differentiating between the two. They were both Gadget. Everyone in her immediate vicinity was Gadget, really.

“I don’t knooooooow~” Gadget Prime responded.

“Can we help?” Once again, Gadget wasn’t sure which twin it was that spoke up. But whichever one it was decided to punctuate her offer of help by gently placing a hand on Gadget Prime’s body.

It was like a switch had been flipped. First, Gadget came. Copiously, more copiously than any previous orgasm by several orders of magnitude. Which made sense, considering how much she’d grown, but even factoring in that it was significantly more than she’d expected. Second, Gadget began to give birth again. Her body rolled over instinctively, steamrolling the twins beneath her gut as eggs began to practically flow out of her, rolling down her cock and onto the ground.

And thirdly, Gadget quadrupled in size. All at once.

Within seconds, Gadget’s body took up the southern end of the park, with her legs and cock reaching into the city proper. She could feel trees and benches and most of the Gadgets getting ploughed over by her increasing bulk. “Yessss,” she hissed, her cock spewing countless millions of gallons of cum into the city streets behind her. “Biggerrrrrrrr~”

And bigger she fuckin’ got, once again quadrupling in size. Eggs flowed out, two or three at a time before getting bowled over by her body without even getting the chance to hatch. Of course, the only difference that really made was that they hatched beneath her body. She could feel them, the countless clones wriggling and fucking and growing beneath her. None of them were hurt, thankfully, so Gadget could concentrate on the pleasure of growth. The sensation of structures being bowled over effortlessly, her mere presence causing untold destruction. Briefly, she felt a pang of guilt – she didn’t want to hurt anyone.

Of course, there was an easy fix to that, she mused, before carefully rolling over onto her back, her cock angled skyward. Her cum rocketed up before raining downwards, coating the entire goddamn city in hot, fresh Gadget seed. And everyone who came into even the slightest contact would become another Gadget. Big and sexy and, as she had just recently learned, indestructible.

Satisfied that she had averted any potential meaningful disaster, Gadget grew again. At this point, she took up the entirety of the park. A good start, but she could probably do better. She would do better. Already she could feel her next few growth spurts building in the pit of her stomach, along with another brood or two of eggs.

A lazy smile spread across Gadget’s face as more of her cum rained down on her body and surroundings from the heavens and more Gadgets began to gather around her. Some of them began to tentatively climb her body, quickly settling into resuming the orgy on top of her tits and belly. Others began fucking on the ground surrounding her, in the few remaining square feet of park and the streets of the city beyond that. All of them acting to prepare the next generation of Gadgets. Soon enough, everything would become Gadget.

That wasn’t, she supposed, all that bad of an outcome. All in all, she decided, idly tweaking a leaky nipple, it had ultimately been a very good day.