James Duke
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RWBY: Blake's Primordial Genetics (With Art)
🕑 Added 2025-05-04 18:58:42 +0000 UTCTags: Weight gain, Animal TF.
Hey all, I'm still working on getting the stories and promotion post around for this month. However, didn't want to let a week go by without a story! I know this might not be broadly appealing, but consider it a bonus story. There will be plenty more regular fats coming!
--- Quick Phone Call ---
“Miss Belladonna, I have some interesting news from your bloodwork,” The doctor said. Even through the phone line Blake could hear him tapping his pen on the table. It was a tell, the doctor was perplexed.
“What. . .mmgghph. . .isssch it?” Blake asked between bites of a piece of fried fish. She walked around the little apartment she had rented in Atlas, phone in one hand and food in the other. Her stomach gurgled, wanting more even as she filled it. That had been part of the reason she had seen the doctor. What had started as a little weight gain from the stress of moving and settling down had begun to grow into something more. In the month she had moved to Vale, Blake had found nearly 20 pounds added to her slight frame. Her hips had widened, stomach forming into a dedicated potbelly. More concerning, however, was her growing appetite. Each day she seemed hungrier, less able to keep herself from indulging. Even currently, food in hand, she was considering her next meal. This hunger had been what inspired her to get some tests done. It was only the catlike curiosity about the results that kept her focused. “What were the results?”
“Well. . .” The doctor paused, the tapping on the clipboard intensifying. “It might be easier if you come in for this. We have found some abnormalities in your blood. Specifically, some genetic markers.”
Blake gulped the fish down in one bite, hunger mixing with fear. Usually, invoking genetic markers was not a good sign. “Are you sure you couldn’t give me any information now?” Blake walked to the pantry and pulled down a half eaten bucket of cookies. Prior to the strange symptoms it would have taken her weeks if not a month to finish the treats. Now, it was unlikely that they would survive the day.
“I’m sorry, Miss Belladonna, but I wouldn’t want to give the wrong impression. Why don’t we schedule a meeting for two weeks out. That would be the soonest my office could squeeze you in.”
“Fine.” Blake sighed, digging her hand into the bucket of sweets. She looked down, seeing her belly threatening to burst the buttons of her pants. An appointment with the doctor was not the only thing she would struggle to fit in soon.
--- Medical Meeting ---
Blake walked into the back rooms of the Doctor’s office, belly leading the way. She followed the Nurse, trying her best to keep up. The nurse was not moving especially quickly, rather, it was the bountiful fat springing about Blake’s body which slowed her pace. She walked almost like a pregnant woman, with her stomach bouncing ahead of the rest of her. She had grown so quickly that her muscles and posture had not been able to keep up. Two weeks had been enough time for Blake to nearly double in size, her growth nothing short of explosive. She wore an oversized hoodie covered in cartoon depictions of cats and stretchy leggings around her ass. Though not showing any outward signs of worry, Blake had begun to look at the world in a different light. Namely, if she was going to start having trouble fitting into doorways and pieces of furniture.
The nurse stopped outside of the office which led to the doctor’s personal study. She opened it, smiling at the portly woman who was waddling towards her. Blake sized up the door as she approached it, checking the width to make sure she did not have to alter her entrance. She put her hands around her stomach, as if to squeeze it into a smaller shape. Her arms brushed together momentarily, the cat faunus taking time to scratch patches of dryness on either arm. Blake walked past the nurse, feeling her jiggling butt with each step. The doctor sat behind a large desk, his arm sweeping out to invite Blake into a smaller one on the opposite side of him. She took it, squashing her doughy frame into the chair. She folded one leg over the other, babying her dry arms.
“Hello, Miss Belladonna,” The doctor greeted Blake as warmly as he could, given the news he had to give. “I think it would be best if we jump straight into it.” He paused, though continued when Blake nodded quietly. “Your recent blood panel came up with some. . .interesting results. Do you know much about your family history? Specifically on your mother’s side?”
“Well, we’re an old family.” Blake said, unsure of where to go with the doctor's question. “I’m not sure what that has to do with my symptoms.”
“Well. . .quite a lot actually.” The doctor sighed, pulling a remote out of his pocket. In your recent tests we have discovered a lot of rare and interesting genetic markers, which have been activated recently.” He clicked through slides, showing results and numbers Blake couldn’t guess at. “As it turns out, you are not purely a feline type faunus.” Blake shifted in her chair, wondering what he could mean. “In fact, we have discovered genetics that are reptilian in nature.”
Blake thought for a moment, considering other faunus she had known. Ilia, a chameleon faunus, came to mind. “Do you know what kind?” Blake asked, tapping her foot.
“Ah. . .well. . .yes and no.” The doctor’s pomp drained away, his hand hovering over the button to click to the final slide of his presentation. He finally pushed the button. Beings of great size and ferocious demeanor scrolled across the screen. Textbook pictures of dinosaurs long extinct came up, each as possible candidates. “We do know that these are older and unmatched with any current genetic samples we have. You are quite a unique case, Miss Belladonna. If you don’t mind a little conjecture, I believe your body is going through a second puberty of sorts.” The doctor adjusted his glasses, clearly nervous and uncomfortable with what he was saying. “I’m sure the symptoms have already begun to manifest. There will be others soon as these new genetics begin to influence your body.”
Blake sighed, looking at the screen. She rocked in her chair, moving back and forth. Her ears flicked in annoyance. She stood, hefting her belly with one hand. Once standing, Blake dusted her clothes off and turned around. “I would like a second opinion.” She sighed and started to walk out of the office.
--- Waiting Room ---
“Blake. . .BBBEEERRRUUP. . .Bella-uuggh-donna. . .here to see Dr.Chance,” Blake spoke while adjusting her sweatpants. She tried to hoist them up and over her tremendous belly, which was currently leaking into the window which separated the nurse from the waiting room. Blakes breasts were also infiltrating the speaking window, warping the plexiglass hole. She was positioned perfectly for her body to work upon the glass. In keeping with the predictions of the first doctor, Blake had continued growing. Now, however, she was expanding in multiple dimensions. She had sprouted up full feet in the time that it had taken to find another doctor willing to examine her case. 9 feet and nearly a ton of Blake assaulted the world around her. Her gut sloshed as she struggled to pull up her sweatpants, the stretchy fabric having long met its match. From behind, the other patients in the waiting room were treated to Blake’s wide asscheeks ripping through the remaining strands of spandex. The ripping of her pants had been started by the immense pools of fat upon her derriere, but her swinging tail finished the job.
In the month since her unfortunate diagnosis, Blake had seemingly become more reptile than cat. There was no more crowning proof that the log-like tail which shot from between her buttcheeks and dragged upon the ground. It was as thick as a juvenile tree and shockingly green. It was the counter balance to her great weight, allowing the large woman to lumber about without issue. It swept back and forth, the knife like points on the end tearing and ripping at the cushions of the chairs. The other people in the waiting room played a deadly game of tag with Blake’s tail. It would only take one glancing hit to give them a different and far more serious reason to see the doctor. Blake, meanwhile, treated the swing of her tail as casually as a twitch of her fluffy ears.
“Oh yes! Mrs.Belladonna!” The nurse tapped on her keyboard. She looked up at the gigantic, feline and saurian figure rising far above her. “Here for the flu, correct?” The nurse rolled back in her chair, unable to see Blake’s squashed and moon shaped face from her normal position. Blake’s head came close to the ceiling tiles.
“Aaah. . .BBBBBEEEERRUUUP. . .I think you have me confused.” Blake scratched at her gut. The scales which now colored her arms a viridian green had begun to manifest on her belly as well. Waves undulated through her unusual bulk, making breasts the size of pumpkins roll back and forth. The gray tank top she had been wearing was little more than a bra at this point. Fluff and fat oozed through even possible free point within her clothes. Glaring portions of Blake’s skin were now thoroughly reptilian, but she could not lose the mammalian softness within her fat. “I’m here about the. . .hhhrrroooooooom. . .” Blake bellowed and shook her head. It was the newest symptom of her second puberty. The feline mewls and hisses had been replaced with occasional bellows and grunts. “. . .genetic testing and second puberty.” Blake finished. Afraid that she might accidentally come into contact with the ceiling, she hunched her shoulder and leaned her head down. “It should be Miss Belladonna, I’m single.”
“Of course! How silly of me!” The nurse patted her head. “When you see as many cases as we do, things can get turned around so easily.” The nurse returned to clacking away on her keyboard, bringing up the relevant documents. “Why don’t you take your seat, dear, it might take me a second to find your files.”
“Of course.” Blake thudded backwards, taking lumbering steps which shook the entire office. Patients sitting in chairs were forcibly jumped up with each foot fall. As they took air, Blake’s spiked tail sailed underneath them. “Thank. . .BBBBRRRROOOOO. . .you.” Always polite, the saurian-cat-faunus bowed. Rolls exploded outward, shoved by the collapse of other rolls on top of them. Blake’s sweatpants burst open fully, hanging on only because of the waist band being buried under her gut. Her food stained tank top snapped as well, letting a breast dangle outwards. Blake gave a small grunt, which still reverberated through the chests of the other patients, and stood back up to her full height. She turned like a tank, moving in a slow circle before waddling back towards her seat. The waiting room was filled with the horrid noise of Blake’s spiked tail scratching against the partition separating patients and the nurse. The stego-cat filtered out the noise and the other patients were too polite or scared to react. Blake was allowed to lumber back to her seat, a set of five ruined chairs, and sit down again.
WUMMMPHHH! The room shook even harder than before as Blake’s immensity slammed down onto the ground. Acres of butt flab devoured the shattered remains of the chairs, ensuring they would be crushed to sawdust. If Blake noticed the destruction which her body wreaked upon the world around her, she gave no notice of it. Rather, Blake yawned and leaned her wide, soft back against the wall. The building shifted, the wall bowing outward. Blake’s cat ears, the sole reminder of the woman she had been, twitched as her tail thumped up and down. The appointment had come unfortunately close to nap time. The sleeping ritual was apparently as important to her reptilian genetics as it was to her feline ones. Thus, Blake was hammered hard in the middle of the day. She longed to graze and sleep, enjoying the feel of her bulk coddling her. “HHHHHAAAAA-RRRRROOOOOOOOOOOO!” She gave another room shaking bellow, loud enough to crack glass surfaces throughout the building. A sunbeam came through the window, warming her second and third chins. Blake licked her lips and wiggled her gigantic hips. Her tail curled over her thighs, dragging several chairs and their occupants in the process.
Blake’s eyes fluttered, dulling as sloth filled her limbs. She hoped the nurse and doctor did not move too quickly. As important as it was to get the second opinion, it could still wait after a dedicated nap. Blake patted and brushed her scaly tail, dreamily wondering if maybe the doctor was going to tell her that the original tests were incorrect. Given all that had transpired, it seemed unlikely. However, Blake would hold out hope.
--- Seeing Friends ---
Team RWBY made their way slowly down the streets of Atlas, enjoying a breezy summer day and reunion. The girls walked shoulder to shoulder, talking and catching up like old times. The long years apart had changed the girls in ways both obvious and subtle. They were no longer the young and bushy tailed students they had been, each bearing signs of adulthood. Yang was a good sight more muscular, Ruby now had curves which outpaced her half-sister, Weiss had actually put on weight, the stress of maintaining a global empire having manifested as stress eating. Jiggles and ripples wound their way through Weiss’ plump belly, which pushed hard against her white dress. From time to time she would run a finger against her forming double chin, as if to check if it had surreptitiously grown more. Prior to Blake’s arrival, Weiss had been the one that had changed the most in their time away. Yet, when considering the many ton monster that had shown up, a plump Weiss with food and sweat stains on her clothes looked decidedly normal. The intermingling of the familiar and bizarre was only enhanced by the girls’ conversations.
“Blake! Do you really have to stomp your way down the street?” Weiss fumed as she felt the powerful steps of her friend. She took large bites out of a hotdog, ketchup and mustard smearing her face. Her fat jiggled uncomfortably whenever Blake’s foot would land, moving in ways that made her weight gain painfully obvious.
“Oh. . .” Blake looked down at Weiss, having been lost in thought for a moment. She could only barely see her friends past the fat which hung in great folds about her green body. “. . .sorry Weiss,” A pillar foot crunched down on the sidewalk. Advanced industrial materials were little match for the primal woman that had been born from unlocked ancestral genetics. Her foot crushed down, sinking into the crushed asphalt. Blake left a trail of dents behind her, the dust kicked up into whirlwinds as her fat tail swished along. Blake’s prehistoric puberty had intensified. Besides the visual proof, a battery of tests from three doctors had further cemented what the initial tests had revealed. Kali’s lineage was old and impressive, hailing back to faunus species that the modern world could only guess at. Something had brought those extinct genetics racing back, giving Blake a new and bulky life. Her cat genes had been utterly supplanted, her form and instincts replaced with reptilian ones.
Blake was now 14 feet tall and many tons, with no signs of her growth stopping. She lumbered around, her flabby form sloshing back and forth unsteadily on clumsy feet. It was obvious that bipedal locomotion was becoming a foreign concept. It was only failing muscle memory that kept her walking upright; that and the scolding she would receive from Weiss. Blake’s skin had completely scaled over, bearing mesmerizing patterns of green, red, and brown. Diamond patterns ran down her bloated love handles, shifting as she jiggled. Bony plates fanned out along her back, shifting to help regulate her internal temperature. Often, Blake would wiggle her snout, long tongue flicking out to test scents hanging in the air. She was naked, save for fabric stretched across her hefty breasts at an attempt at modesty. Her gut folded down, almost touching the street as she took slow steps.
“Oh don’t let her get to you!” Ruby bounced onto Blake’s tail, resting her curvaceous body amongst the bony plates which sprung from Blake’s back. She nestled her large butt into the fat rolls, her arms resting overtop of a couple of plates. It was debatable if Ruby understood her late appearing sensuality in the same way it was debatable if Blake fully grasped how thoroughly she had been changed. “You just keep being you, Blake!” Ruby grinned, a blush being the only evidence of possibly perverse thoughts about her prehistoric teammate. Ruby’s enormous chest bounced up and down as Blake thudded down the street. Weiss and Yang both glared at Ruby, either for taking Blake lightly or because her curves had so easily surpassed their own.
“Thanks. . .BBBBARRRROOOOOOOOOM. . .Ruby.” Blake trumpeted, her voice booming out across the city like a fog horn. Her ears twitched, the final marker of her original lineage. The small triangles flicked back and forth, betraying the excitement that the grand lizard felt. Despite how thick her fat and scales were, Blake’s skin was even more sensitive than before. She could feel Ruby’s thick butt and thighs wobbling against her body, heavy sacks of cake resting on the rolls between Blake’s back plates.
“We just hope you are having a good time! It’s been so long since we’ve seen you.” Ruby patted Blake.
“Has it been a big adjustment?” Yang asked, staring up at her friend. Weiss rolled her eyes, continuing to shovel food into her fat face.
Blake rubbed the chins wobbling below her snout with a three fingered hand. Her hands were now thick and clumsy, yet she used them as if they had always been that way. There was no attention paid to the grace and nimbleness that she had lost, not even a thought for the fact that she had once had four fingers. “Nah. . .maybe just a little hungrier,” Blake said as a gurgle peeled through the vast bellows that was her gut. Ruby gasped as she felt herself shaking, more than a little pleased. Weiss felt a sympathy pang running through her own gut. “Oh! It has been kind of hard to remember to bend down more.” A hand passed over her black hair and cat ears. She then slapped her distended gut.“Gotta remember to keep all this in line too.” She grinned, feeling the doughy girth that now defined her. The sauropod woman lumbered down the street, now getting more interested in food. A groceries worth of fruits and vegetables would be required to fill her belly. “But other than that, I’d say I’m. . .BBBBOOOAROOOOM. . .the same.” Blake trumpeted again, having caught the scent of a fruit vendor.
She waddled forward, her tail thudding against cars and storefronts. The 14 foot monster moved as quickly as she could. Weiss and Yang had to jog to keep up, lest they be swatted by her tail. Meanwhile, Ruby rested amongst the stegosaurus girl’s plates, wondering how much more Blake was going to change. Though Blake down played it, there was coming a time when she would need more serious help.
--- Caretaking A Friend ---
“Hey Mom. . .Harrrooooooom. . .good to. . .mmmgghph. . .hear from you.” Blake spoke into the miniscule phone before dipping her large face back into the basket of long grass. She pulled up a bushel’s worth of freshly cut greens, chewing them in such a way that it looked like her snout had dragon whiskers. “Mmmgghph. . .schoorry. . .jussccht started. . .mmmgghph. . .third lunch.” The stegosaurus spoke between munches, her tail flicking back and forth behind her. Blake had just waddled in from her pasture, desperate to have her belly filled more. Though she had spent the time between meals grazing, her stomach had emptied in record time. She shifted her snout towards the phone again, eager to hear what her mother had to say. Ruby held the tiny cellphone closer so Blake was better able to hear it.
“Ooooooh is my baby getting her fill? I hope those friends of yours are treating you nicely. Did they rub down your scales today?” Kali spoke with all the love in the world for her changed daughter.
“BBBBLLLLEEERRRUUUPPP. . .oh. . .trust me. . .I’m getting plenty.” Blake shook her impressive bulk, letting the fat fly in every direction. Blake’s belly now never broke contact with the ground. It flooded out between her four pillar legs. Blake had reached the end stage for her second puberty, fully succumbing to the unleashed genetics. As long as a school bus and infinitely heavier, Blake filled much of the warehouse-pavilion that had been built to hold her. She lived in the countryside now, surrounded by greenery that she could feast on daily. Her hands had disappeared into circular trunks, forcing her into a life lived on all fours. Despite all of the human and cat qualities she had lost, the green reptile had kept her fuzzy cat ears and Black ears. The strands of hair, meticulously maintained by Weiss, framed a prehistoric visage. “They have been making . . .BBBBAROOOOOOOM. . .carrot cake for me. . .lately!” Blake’s excitement always peaked when the issue of snacks were brought up. Her sweet tooth long outpaced Ruby’s now.
“How wonderful! Really, I think this little change has been good for you!” Blake blushed, practically hearing her mother’s smile through the phone.
“I. . .mmmgghph. . .agree!” Blake sucked down the last of the greenery in the basket. Yang, who had been holding up the feeding container, tossed it away. With her thick muscles flexing and rippling, she began to lug over the next course. Blake’s eyes widened as saw that her trough had been refilled. It was made from a cut and polished log, able to hold gallons upon gallons of food. Currently, it was filled with a pudding that was chock-full of sugar and fruit in equal portions. Blake trumpeted, pushing her stuffed mass forward. Thick legs, with surprisingly defined and bubbly buttcheeks, bounced. Blake’s heaving gut bounded outward, knocking the stepladder that Ruby had been using away. There was a sound of screeching as one of the bony spines on Blake’s tail scraped against the metal siding of the warehouse. Ruby leaped free, still holding the phone.
“Sorry, Mrs.Belladonna, our little lizard was just given her second course.” Ruby said, bouncing on her heels as she watched Blake shove her face into the pudding mass. Creamy goop flooded over the sides. Blake’s long tongue flicked out, shoving in whatever she could not reach immediately. Blake eating was a fascinating treatise on the behavior of extinct species. Ruby had seen that strong, flexible tongue strip entire branches of their leaves. Though, that had been before Blake had gotten too fat to stand on her hind legs. Now, it worked to scoop up greenery that was below her many rolled neck. “I can put her on again if you want.” Ruby bit her lip as she watched Blake eat. The sauropod woman’s breasts had become drenched in pudding, giant droplets splashing onto the floor. Ruby bounced her own breasts, wanting to feel closer to Blake.
“Ooooh, that’s ok! I’m sure she’s hungry.” Kali giggled on the other end of the phone. “Maybe just see if she can talk after.” The older woman sighed. “I might need to come and visit her soon. Sorry I haven’t been able to make it.”
“That’s ok!” Ruby was quick to assuage the guilt Kali was feeling. “I’m sure you’ve been busy.”
“Oh nothing major, just a few health complications of my own. You know how it is when you get older. Your body just starts doing new things!”
Ruby looked at Blake’s towering bulk. She moved in heavy but natural motions. Though born as a cat faunus, she had taken to life as a dinosaur without trouble. “I’m sure you are handling it well! It must run in the family.” Ruby said into the receiver. Curiously, she did not get a response. She looked at the phone, wondering if the remoteness of the warehouse had caused a reception failure.
“Ruby!” Blake boomed, too excited to control her volume. “Ruuuuub my. . .BBBOOOORROOOM. . .belly. . .please!” Blake said, her voice thickened with cream. The large dinosaur had turned from her meal, fluttering her exceedingly girlish eyelashes. Blake’s cat ears were going wild, twitching up and down with pleasant sensory input.
“On my way!” Ruby tucked the phone between her gigantic breasts, eager to help her friend more.
---
“. . .it must run in the family.” The words had hit Kali with such force that she had almost been blinded. She had been so excited to hear them that she had stomped her feet. Huge, three toed feet had crushed the floor below her. The table had thudded up and down, making the tiny cellphone bounce. Kali, overcome with thoughts about medical tests, family trees, and excessive dinners, had licked her jaws uncontrollably. A large, thick tongue longer than a human arm slid along a square head. Behind Kali, a big but pointed tail wagged. She thumped towards the table, trying to conquer her excitement and return to the conversation. Her gut and breasts hung down, parting small and pitifully useless arms with two clawed fingers apiece. Atop a red scaled head, cat ears twitched amongst a thicket of black hair. Advanced hearing allowed Kali to pick up the feasting of her daughter, along with the noises of her gigantic body. She had grown well, adjusting to everything life had thrown to her. Kali knew just a bit about that. In a fit of motherly pride and bestial hunger, her attempt to return to the conversation turned into a moment of deep hunger. Kali’s immense jaws opened, crunching around the table.
“Ooooh. . .mmmmgghph. . .poo!” Kali said as she reared up on her thick, sumptuous hind legs. Her small arms poked at her gigantic breasts. She could not make herself spit out anything once it was between her jaws. The new commanding instincts uncovered by her recent bloodtests were too strong for that. Kali instead crunched and devoured the phone and table, swallowing them without ease. They were not as good as the dumptrucks worth of meat she had been eating, but it was a sufficient snack. “Ghira, honey. . . .HHHHARRRRROOOOOAAAR. . .it happened again!” The obese dinosaur called back to her husband. “Could you take me to get a new phone?” The Kali-saurus-rex started to turn her predatory bulk around. “I promise I won’t nibble anyone this time!” She smiled, showing teeth the size of swords. Some promises were easier to keep than others.
