The following fic contains: female muscle growth, breast expansion, ass expansion and ass worship.
The world below Isane Kotetsu just kept getting smaller and smaller. It was bad enough she was already a bit over six feet tall normally. But ever since she agreed to that experimental procedure in little Nemuri’s lab, the towering captain kept waking up to a smaller and smaller blanket covering her sweat-beaded body.
It all started innocently enough; the first few days just left her with much more energy and much more reitsu practically brimming from her body. It was something having to do with trace amounts of her dear departed Captain Unohana’s power and how everyone agreed that she should be the one to take up her mantle.
Problems started to occur about a week later, when she tried doing her usual morning exercises. She started by crouching on the floor and stretching out her left leg as much as she could. The exertion of doing so sent a very startling wave of tingling pleasure through her body that started to make her poor flushed womanhood moisten. Then as she held onto her thigh, she could feel the flesh actually pushing against her hands, swelling up a few inches and leaving her thigh muscles bulged and more pronounced. She watched in horror as the feeling spread – first, her calf on that leg grew visibly rounder, then that feeling traveled the opposite direction. Her cheek attached to that leg began to balloon outward a few inches with soft jiggly mass, while her glute muscle under that puffed out even more. This was quickly followed by her other cheek, then the other thigh, other calf… then she could practically feel the tingling wave pass back up that leg and right up her waist!
Her stomach began losing what little flab it had, turning lean and healthier, Next was her pectorals, obviously eclipsed by her breasts, so they too begun to feel a lot heavier and began to strain the top of her hakama more than usual. Her nipples stuck out like puffy hard soda bottle caps. Her shoulders – once a smooth slope right down her forearms to her elbows – they began to round out slightly with deltoids, followed closely by small biceps muscles forming whenever she flexed.
The shock of all this left her stunned for quite a while, but she eventually shook herself back to reality. Maybe this was just a delayed reaction to all the physical activity she’d been put through recently after the procedure? Just to be sure, she wanted to finish what she started, stretching out the other leg… The second wave caught her even more off guard, indents of thigh muscles appearing on both legs as the slow spurt and spreading process came again. Shoulders rounding, stomach getting flatter, biceps rising more without even flexing them, even her height went up an inch.
She started to panic, this was not normal. Her body felt so… pent up, like she absolutely needed to move, needed to run, flex, punch, anything to get all this energy out! She reached for the floor with her right arm with a push while clenching her legs to stand up, this might have been a mistake. Right arm… left leg… right leg… it happened once more in all three parts! The wave of her body evening itself out almost sent her toppling down to the floor again. One thing she was able to notice though was that her tangerine-sized bicep seemed to grow just a bit more than her legs did, right before the spreading phase of her condition occurred.
She had no choice… as a medical professional, if some unknown illness was wreaking havoc over her body, she had to analyze her symptoms… experiment perhaps. She started with a simple stretch with both hands interlocking fingers and stretching her arms above and behind her head. She could feel the muscles stretch from the stress on them… and subsequently the pleasant feeling of them swelling bigger. She shuddered as her now orange-sized biceps pressed into her head behind her ears, then spread to her deltoids and the rest of her body below. Curious, when both limbs were excreted at the same time, the spreading growth that was starting t form six bumps on her tummy went down to her sweat-glistened legs in both at once.
So, what would happen if she did it to one limb at a time again…? Before she could stop herself, she stood with her legs slightly splayed and gave a great but pumping flex to her right arm, clenching the limb as hard as she could without hurting herself. She could feel her arm pumping bigger, thicker as she watched the tricep under her arm hang down lower as her bicep rose higher. She gasped in pleasure as flexing it made it bigger than a grapefruit and it barely got any smaller when she relaxed the arm. It only took a few seconds for the other arm to pump up to perfect symmetry, pecs pushing out tits that swelled bigger than her head – bigger than Matsumoto’s!
She moaned with a bit of drool escaping the corner of her lip as the spreading hit her ass again. Not thinking about the consequences, she bent over as it happened, rubbing her thickening thighs as she did so, which just send another spurt out! Her pale round ass was already her best feature, but now the soft pillowy masses were billowing out, as if they were hooked up to an industrial air pump. She couldn’t help herself, she reached up and started groping it! Her pale cheeks were already close to a proper “facesitting”-size combined, but the stimulation from the spurting were making each cheek up to the job of covering an entire person’s face. Her fingers dug into the surprisingly pliant flesh, she could feel it resisting her gropes with small subtle spurts. Pleasure… did pleasure also make her grow too?
Did she dare find out? She was a medic after all… and it did feel so good… what harm could just one more experiment do? There was a loud thud as she let her bulked body slam back onto her futon. The impact didn’t hurt at all, in fact it just made her swell again! Her back muscles were already developing into a firm ridge, bus she could practically feel her whole body pushed up a few inches from them getting a decent spurt. That soon spread to her quaking bosom, each basketball of pudding rose higher on her swelling chest. She reached out, feeling a small spurt going through her arm again as she flexed her index finger and gave the nearest nipple a nice strong… flick!
There was an audible scream of pleasure, her whole body spurting about three inches just from that while both nipples doubled in length, looking more like fleshy batteries. This was followed by her muscled hands gripping each billowing orb, her juices flowed as she felt them swelling; like they were sentient blobs, trying to escape their finger prison. But she wouldn’t let them go, they were hers to keep, hers to flaunt and lord over Matsumoto. See how she likes having big huge tits rubbed in HER face every weekend at the bar! She could bench press her at this rate – she thought as one hand snaked down to her quaking puffy pussy. Lift her off the ground, especially now that she was two heads taller than her! Her two fingers quickly pierced her vulva as she thought of gripping that sexy shinigami’s ass with both hands, lifting her up and bringing her spread legs right up between to her waiting, drooling lips… All while standing, carrying both their weight as a quivering, moaning Rangiku pressed her hands into the bar’s ceiling for support as her titan lover devoured her!!
Many nearby shinigami bolted awake from the sound of their beloved captain’s screams. Her loyal sister made haste to Isane’s room and slid the paper door open just in time to see something that would be burned into her memory for the rest of her supernaturally long life – for better or worse. The once tall but timid big sister laid splayed across her futon on the floor. The thick musk of her alluring pheromones wafting the whole room and her whole body dripped with perspiration. The captain’s right-hand fingers probed deep into her gushing love canal from the cooldown of her monstrous orgasm.
Her body was like a mountain ridge at this point! Starting from her sister’s perspective with long thick legs that could crush the mask off a hollow without much resistance. Thick chords of muscle started with bulbous calves as thick as her head, making a bit of a somewhat hourglass shape with her knees, and then her monster thigh muscles – each one about as thick as a man’s waist and would constantly rub into her womanhood while walking. Her hips were insanely wide, on par with the width of her bloated shoulders and way past the descriptor of being “childbearing”; more like litter bearing. Isane began to rise up, showing off her monstrous abs – each soft feeling lump was the size of a man’s fist and ten times as hard with deep crevasses between them that could bend a coin. Her tits hung heavy and heaving off of her chest, each one about twice the size of her own head with the quaking cusps level with her belly button buried in her abs. Her puckering nipples were almost like a pair of pill bottles at this point – long and visibly throbbing, capped with teacup-sized areola. Her shoulders hung heavy on her torso, like pauldrons of a knight’s armor, but round and somewhat pumpkin-shaped, their round bloated mass only rivaled by her massive biceps. Each one like an American football grafted under pale delicate skin with her triceps underneath matched in sheer mass.
Kiyone stood gawking, not sure what her sister-captain mumbled at her as she watched her stand up and flex her arm… then turn around with her hands proudly on her broodingly wide hips as she looked back with a blushing cocky smirk. The sight next made her almost faint as she stumbled forward. Her back muscles were indeed like the ridge of a great mountain. Her traps behind her head pressing slightly into her neck, while her shoulder blades looked like actual plates of armor were underneath her skin. Her waist behind those monster pecs was still as thin as a wasp. Her very structure defied many laws of physics that bother girls didn’t care to know. Then there was the ass… that hypnotically massive thing…
Kiyone hardly noticed herself approaching it, pressing her white gloves into that waiting flesh. She hardly seemed to care that her head only came up to the tip top of Isane’s crack, all that mattered to her right now was the buffet of booty set out for her to enjoy. She started out small… her hands resting at her sister’s swollen cusps of each cheek. The border of which in contrast to her meaty crushing thighs was a ridiculous slope that sort of hung outward over a foot behind said legs. It was baffling how firm it was and just how heavy each cheek felt when she pushed up with her hands. The ripple of jiggle this caused seemed to distract her from the fact that doing so felt like a fraction of a pound was added to that immense weight with every grope. She found herself soon leaning forward, her face-cheek impacting with her sister’s ass-cheek with an audible smack and a coo from her. The skin was satin-smooth and glistening-moist from the workout Isane gave herself. To her delight, pressing further into each cheek gave a lot less resistance then she thought it would. She thought for a moment that her whole head might sink into just one cheek! But thankfully it was only about a few inches – again, more than she thought it would by a very pleasant margin.
Her little ass worship was rudely interrupted by the sounds of other onlookers crowding the doorway of the now ten-foot captain’s quarters. Faces flushed, nostrils dripped crimson and hakamas tented at the sight of their powerhouse boss. Insane scowled though… this body… it wasn’t for them, it was for Rangiku, or her lovely sister to a decent extent… maybe that cute little Hana-kun. He looked like he would be a nice specimen. Making sure said Shinigami was not in the crowd of snoopers, Isane started moving away from her pawing sibling. Each step sending another mini pulse through her body, every stride of her legs made another drop of arousal bead on her womanhood as she approached a nearby armoire… She cracked her knuckles – another spurt – grabbed the bottom with one hand and the side with the other – another gooood spurt – then… hurled the entire thing at her door, smashing it to splinters and sending her subordinates scattering like cockroaches along with a commanding yell for some privacy. She almost fell to her knees from the mother of a spurt that gave her, even taking the time to egg on a few more to get her up to a nice respectable twelve feet tall – double her old feeble self.
Kiyone sat trembling on the ground as Isane stomped and spurted towards her… but gave a sigh as her hulk sibling just reached down to kiss her on the forehead. She had somewhere to be… Division 10. She didn’t even seem to care how she wasn’t going with a stitch of clothing… or how her shoulders squeezed through doorways, or how she had to duck to even get through them. She had some dreams to make a reality.