It had been a normal lesson for Class 3-A of Mahora Academy, and the teacher Negi Springfield was addressing the class at the end of the day. He looked across his bevy of beautiful students and started to blush. He cleared his throat and started to speak. “Well, that should do for the lesson today. Everyone please have a nice day and um...” His gaze was drawn back to a particular student and his blush grew darker. “Um, like I was saying, have a nice day and enjoy yourselves on the weekend. Chachamaru, could I talk to you for a moment please?”

“Of course, Negi-Sensei.” Chachamaru went and walked over to his desk as the rest of the students started to exit the room. “What is the problem sensei?”

“Well um, it’s about Chisame,” Negi stuttered. He was a bit unsure how to approach this situation. “It’s just um, lately she’s been um, uh…”

“Are you referring to Chisame’s recent gain in mass?” Chachamaru asked. She looked over at Chisame, who was struggling to get out of her desk. In recent weeks she had grown a small potbelly that was now pressing against her desk. It was a soft tummy that was squishing into her seat. Chisame grunted as she pulled her gut out and stood up, starting to pack up her books. Standing up it was a lot easier to see how much weight she had put on recently. Her stomach made her shirt too small, and her potbelly pooched out slightly underneath, exposing her belly button. One could also see her small muffintop which thickened into a set of love handles.

This was all on top of a set of thicker thighs and a bigger butt, which had also gained weight. Her butt was large enough at this point to make her skirt incapable of full coverage. Even while standing up one could see the soft curves of her ass that were starting to cover up the folds of her panties. Negi could make them out from here, they were pink with cute little white hearts on them, and they were slightly nestled in the fat of her butt. Even her breasts had swelled from the weight she’d put on. They bulged against the cups, forcing Chisame to have to keep the top of her shirt unbuttoned to let her breathe. This had the pleasant side effect of making her cleavage fully visible, her now d-cup breasts baring the sides proudly, with the middle of her matching bra also on display. Indeed, between her breasts and her belly she could only button about half of her shirt. One would wonder why she hasn’t gotten a bigger size yet.

The answer for that may simply be denial, as Chisame seemed blissfully unaware of her gaining weight. Even now as she stood up she was munching on her third candy bar of the day, the chocolate hanging out of her mouth as she picked up her books from the floor. As she bent down her panties got wedged further into her butt. She nonchalantly pulled down on them, not noticing it barely helped her coverage. She finished off the chocolate bar and licked the last bit of melted goodness from the wrapper. Chisame grabbed her books and started walking out of the classroom. Her whole body started bouncing along the way; her breasts, her butt, and of course her belly all wobbled slightly with each step. She unwrapped another candy wrapper as she headed out the door. “See ya later sensei,” she said casually as she left the room.

Negi’s gaze had followed Chisame across the room and continued to linger on the doorway even after she had left. His mouth was agape and his blush was intense as he saw just how much of Chisame had become a bevy of jiggling flesh. If he had to guess, she must have put on thirty pounds or so in just three weeks. “I guess you could put it that way yes,” Negi said.

“Sensei, I am detecting extended temperature readings from your face and lower body. Are you feeling well?” Chachamaru asked. Negi was taken aback.

“N-no, I’m fine, it’s just, um…” Negi stuttered. He nervously started poking his fingers together.

“Negi-sensei, are you aroused by overly voluptuous women?” Negi’s face turned bright red and he threw his hands up in the air.

“Well, I wouldn’t put it like that, exactly. It just looks so soft, you know? It’s almost hypnotic seeing her whole body bounce like it did before,” Negi replied, scratching the back of his head in embarrassment.

“I see.” Chachamaru said, her own face starting to overheat. “Does this mean you would like me to go and encourage her to gain more weight for you?”

“Yes,” Negi said, before realizing what he agreed to. “I mean no! As much as I’d like it, it’s not right as a teacher to let a student be so unhealthy. You’re her best friend, I was hoping you could talk to her about her problem and try to convince her to try and be healthier,” Negi said. Chachamaru cleared her throat.

“Very well sensei. I have an appointment with Hakase right after class, but once my business is done I shall go and speak with her.”

“Thank you very much Chachamaru, and um, I’d appreciate it if you would keep my little fetish a secret.”

“Of course I will sensei. If more students in this class were to find out you have sexual fantasies about large women, I estimate the total mass of the class would increase by at least 75%,” Chachamaru stated as she left the room.

“Thank you again Chachamaru,” Negi said. “What do you mean sexual fantasies!” he yelled, a bit louder than he intended. “I just like seeing them that big and soft is all,” he said to himself quietly.

Chachamaru’s face got hotter as she left the room, talking to herself. “So, Negi-sensei is more sexually enticed by a combination of three things; large breasts, a thick lower body, and increased stomach mass. I need to go see Hakase.” Chachamaru walked down the hallway, starting to run a database of fat girls through her head. Along the way, she passed Nodoka Miyazaki, standing by the classroom door, holding her books in front of her face. Unbeknownst to Negi or Chachamaru, Nodoka had heard pretty much all of their conversation. Nodoka still couldn’t believe what she heard though.

“N-N-Negi likes fat girls? B-but I’m so skinny. It can’t be. He’s always seemed so gentlemanly. How could he have a fetish like that?” Not believing what she heard, she activated her pactio, her mind-reading book appearing in her hands. “Negi Springfield,” she said, starting to have his thoughts appear on the pages before her. What she read surprised her.

“Chisame laid her naked body across the bed, her bold belly pouring out onto the mattress. Her thick love handles glistened with sweat as she posed seductively, lifting one leg in the air, showing her meaty thighs and thicker calves. With one hand she slapped her fat rump and moaned as the fat rippled across her cheeks, vibrating down her legs. With her other hand she lifted her squishy breasts, bringing her left up to her face and licking it with pleasure. Her now-rounded face smiled as she licked her lips sexily. Her right hand stopped feeling up her delicious lower body and reached down for a can of whipped cream. She sprayed the creamy mixture all over her body with abandon, paying special attention to her nipples, before emptying the rest of the can in her mouth, swallowing the delicious cream with delight. ‘Oh Negi’, she says. ‘Am I big enough yet?’  Throwing the empty can to the ground she picked up a bottle of chocolate sauce, and started to…”

Nodoka slammed the book shut, her face as red as a tomato. “That’s really the kind of woman Negi likes then,” she said sullenly. She thought back to that erotic scenario, the image of a fat, cream-covered Chisame still lingered in her thoughts. Her legs squirmed together as she imagined herself as big as she was. “Maybe, maybe it wouldn’t be that bad. I wouldn’t have to worry about watching what I eat, and I’d finally get a bigger chest.” She cupped her own petite boobs in her hands to prove her point. A hand of hers crept down below to discover just how aroused she was by Negi’s thoughts. “Well, if Negi wants fatter, I’ll give him fatter!” With new confidence she turned to leave the school, but first she’d have to stop at the bookstore.

Of all the girls who were crushing hard on the student teacher, it was the chubby Chisame who arrived at her house first. She opened the door with one hand, her gut being the first thing to come through the door. Chisame tossed a bag of groceries on the countertop. A collection of snack cakes and junk food toppled out of it. She grabbed a handful of the food and went to her room, passing her roommate Satomi Hakase on the way. Satomi, it seemed, had put on some weight herself, most likely as a result of Chisame leaving unhealthy food everywhere. Her belly stuck out slightly and her pants seemed a bit too snug. Chisame shrugged it off and went to her room. “I’ll be busy for a while, so don’t bother me,” she said as she closed the door. Satomi grunted, her most common form of affirmation, and stood up. She casually walked over to the table and grabbed a moon pie. She unwrapped it and started eating it as she continued to work.

Chisame placed her snacks on the table and sat down. She opened a Twinkie and devoured it in two bites, licking the excess cream from her lips. The idol opened another snack cake and started to eat it as she powered on her computer. The food hung out of her mouth as she pulled out her pactio card, activating it with a garbled statement of “Adeat.” Her four electronic sprites appeared next to her as Chisame’s ill-fitting uniform was replaced with her pactio outfit, the black garment having changed itself to fit her pudgier form. “Okay guys, let’s get ready for today’s live show, go ahead and roll camera. The sprites started their magic, setting up a series of cameras in Chisame’s room that would be able to stream her show across thousands of computers, right into the bedrooms of horny boys and girls everywhere.

She looked into one of the cameras, giving it a wink. “Hello everyone, I’m so glad you’ve tuned in to my show today. I’ve got a special treat in store for you today. Take a look at all this food I’ve got here. Now, I’d like to eat this all, but I spent sooooooo much money on these,” she pouted, he lips pursing to make herself look more adorable. “So, let’s make this extra fun!” She bent over, exposing her deep full cleavage, from which she pulled a chocolate pastry. “For every hundred dollars I get donated to me, I’ll eat another tasty treat. If we get to $2000, then I have another surprise for you.” Chisame bent over, another camera taking view of her wiggling and fatty ass. She pulled up a succulent chocolate cake. It was covered in thick, rich ganache, with bits of cookie crumbs sprinkled on top. The layers of chocolate piled on top of each other in dark, milk, and white varieties to make an exquisite dessert. It was enough to satisfy the snack urges of eight normal people, but Chisame’s appetite was far more voracious. She licked her lips as she looked at the camera. “See this chocolate cake? If we hit that mark, I’ll eat all of this. Just. For. You. I’m not sure if even my big belly can take it.” She grabbed her belly to prove her point, bringing it out of her top, showing her navel and folded flesh for the world to see.

“So what do you say everybody. Let’s start the donation now. You have one hour. Let’s see just how bigger and squishier you can make me!” One of the sprites started a timer on the screen, with a display of donated money next to it. Chisame’s image was plastered in the middle, a smile on her face as the donation counter increased to over $200 in a matter of seconds. “Ooh, you’re all very excited to see me eat these yummy treats, aren’t you?” She smiled and unwrapped the first of many treats, sticking the whole pastry in her mouth. The sweet, fluffy cake moistened in her mouth as she closed her mouth, letting the sweet, thick cream spurt out and delight her taste buds. She munched the deliciousness between her teeth, chewing it carefully and then swallowing, moaning in delight as it went down her gullet. Chisame quickly snatched another one and slid it partway into her mouth. Plump lips covered half the jelly krimpet as she bit down, feeling the warm raspberry goo squish as she took the second bite, devouring it in a few more seconds.

The sprites captured every detail of Chisame’s display, the money counter continuing to rise as the biggest net idol ate herself silly. Biggest here means two things, that she was the most popular, and she was the fattest. Chisame had learned a few weeks ago about the surging popularity of chubby females and weight gain videos, and decided to let herself go to increase her popularity. Despite initial fears that she would bite off more than she could chew, Chisame had quickly found that she loved gaining weight. It was a relieving habit being able to eat whatever she wanted, whenever she wanted. There weren’t any big problems so far, and using the little magic she knew she was able to keep herself healthy despite the constant gorging. The biggest benefit was obviously the boost to her ratings, but to Chisame’s delight her body had gotten extremely curvy from the process, and she was getting even curvier.

Chisame continued to eat as the donation money came in, with the cameras looking at her glorious body as the pounds started to pile onto her. As she moved onto her fourth snack, the bottom of her shirt started to get pulled away by her growing stomach. Her swelling belly pulled apart the black fabric, making her chub show through the spaces between the buttons. Chisame moaned as she tasted the delicious pastries, letting the fattening snacks fill her stomach. The growing tummy pushed further outward, starting to pull apart the stitching, making her sexy stomach show through the shirt. Her stomach was growing in all directions; thickening love handles starting to pour over her hips, making her look ever cuter than she was before. Fat started to accumulate all over her body, her thick potbelly bursting a button on her shirt. When that happened she received a huge burst in donations, making her smile as she shoved another treat between her succulent lips.

Her whole being was full of cream and cakes, making her swell all over. The top of her shirt was starting to feel tight as some ounces started to make their way to her breasts, making the round orbs even sexier as they started to strain the confines of her shirt. Chisame could feel her butt start to press deeper into the seat, her thick thighs gaining more weight as her ass received a sizable amount of gain as well. Her lower body got even more pear shaped as she felt the fabric on her hips start to tighten. With another swallow, two more buttons on her belly popped open, revealing her sexy belly to the world. Her dainty belly button was fully exposed, and Chisame playfully traced its outline with her finger as she licked some cream off the top of a cupcake. Her face started to blush as she grabbed her belly with one hand, shaking it up and down. Her jiggling gut bounced up and down, sending small ripples of joy across her body. She smiled as she looked at the counter on the screen. She was halfway to her goal. “Mmm, these treats are all so yummy; I might just grow right out of my clothes!” With that statement donations shot up again and Chisame licked her lips with a combination of lust and hunger.

Meanwhile, the android Chachamaru Karakuri was walking to the room shared by Chisame and Satomi. After visiting the lab Satomi usually works, she was surprised to find Satomi had gone straight home. This was convenient for Chachamaru, as it meant she could easily speak to Chisame right after. She walked towards the dorms, letting her hands run across her body. Her thin, athletic body showed no trace of adipose, being perfectly designed for maximum efficiency. But for Negi-sensei, she would be willing to change that. Her cheeks got hot as she imagined herself growing bigger, hoping her creator Hakase would be able to help her out in that sense.

“You want to be fatter? Yeah, I can do that easily,” Satomi Hakase said after Chachamaru asked her question. “I don’t know why,” she said, munching on a cookie, “but fatness has been on my mind a lot recently.” Chachamaru kept quiet, not wanting to bring to her attention Satomi's own weight gain. “I actually just finished an update that would allow you to change mass; do you want me to install it?” Chachamaru nodded rapidly, sitting herself down on the table. She shut down for a few moments while Satomi performed the updates.

Five minutes later, Chachamaru rebooted, looking down at her new body. It looked exactly the same as her previous model, but when she felt her stomach it felt softer, and less mechanical. Examining her breasts and butt led her to the conclusion that her outer synthetics had become more skin-like. Her whole body felt incredibly soft and sensual, and she was getting excited as she felt new sensations run through her systems. Her hands explored every inch of her rotund curves.. Even if it wasn’t chubby yet, she was getting aroused exploring her heightened sensitivity, her face getting bright red as she started to pant from the excitement.

Satomi coughed, getting Chachamaru’s attention. “I’m glad you’re enjoying it, but we aren’t done yet. Without warning, the scientist shoved a tube into Chachamaru’s mouth. “This container is filled with a special concoction I made. It should fatten you up quickly. Also,” Satomi licked her lips with a smile. “It’s quite tasty. Let’s start slowly, about ten pounds of weight.” Chachamaru nodded, and Satomi flipped a switch, making the concoction start to pour down Chachamaru’s throat. Chachamaru swallowed the mixture, finding it to be delicious. She was a bit angry at Satomi for a moment. This was the amazing sensation of taste she had gone without with for so long? It was amazing, she felt like her whole body was filled with ecstasy. She moaned as the mixture filled her throat, the creamy, thick goodness tasting amazing. She felt it run down into her expanded stomach where it started to swell the confines of her belly. She felt a new sensation now that felt even more incredible. Her stomach was swelling now, pressing out as it filled up quickly.

Satomi smiled as she watched Chachamaru fatten up before her eyes. All the weight was focusing on her stomach and midsection, meaning she was starting to gain a lovely muffintop. Pounds of new flesh formed on her belly, giving the android a softer look. Chachamaru moaned as she swallowed the mixture, the taste almost erotic to her. Adipose accumulated on her stomach, making it stick out slightly. Chachamaru was now swallowing the mixture with glee, a bright blush on her face as she felt herself getting fatter. After another minute, the pumping stopped, but Chachamaru still continued to suck on the tube, hoping for more to come out. 

“Um, it’s stopped, Chachamaru,” Satomi said. Chachamaru gave a slight pout but then stood up to examine her new weight. She jumped up and down, watching her slight pudge jiggle as she landed. She gripped it in her hands, feeling her fingers give in slightly. She smiled and rubbed her belly all over, the sensation feeling relaxing to the android. Without warning, she leaped into Satomi and gave her a big hug. With the weight of the girls now equal, their chubby bodies squished against each other in a sensual embrace, their belly buttons touching. Chachamaru squeezed her so tightly, the scientist thought she would choke until she let go. Satomi coughed a bit, then spoke again. "Well, that should be good. I want you to go ahead and have normal meals for a week and report back to me with how you..." Before she could finish, Chachamaru had sat back down on the table and was starting to place the feeding tube into her mouth again.

"Chachamaru! What are you doing?" Satomi asked.

"I wish to gain more. At least forty pounds should suffice."

"What? You want to gain fifty pounds total?" Satomi said. Chachamaru nodded, affixing the tube. The scientist shrugged and started the pump again. Chachamaru would have smiled were the delicious, fattening mixture not sliding down her throat again.

'Chisame has gained at least thirty pounds,' the android thought to herself. 'This should be more than sufficient to please Negi sensei.' Chachamaru started gulping in the fluid, her hands drifting south to feel her belly as it grew. They started up top, feeling as the cold creamy substance filled her gut, pushing it into her hands. She gripped new pounds of squishy, soft flesh, letting it run between her fingers. With each pulse of the machine came another wave of swelling, her stomach getting so full and content. She moved her hands down to the sides of her belly where she felt the fat settle, creating soft love handles on her waist. A small fold appeared near her hips where a layer of cellulite formed and started to pooch over her waist. Chachamaru could look down and see her growing mass start to block sight of her sexy feet, the sloshing belly jiggling with each swallow.

Satomi stared in awe and Chachamaru ate the concoction with increasing speed, her plump lips sucking in more and more with each pulse, her delicious tongue lapping at her lips to take it all in. At the halfway mark, her belly reached the point where it couldn't create any more fat, so the mixture started settling elsewhere. Her boobs starting to expand, growing softer and sexier with each gulp. Smooth fat accumulated on her supple tits, stretching the skin to make room for her bigger breasts. She placed her hands on her growing bosom, feeling her boobs press into her palms. She started to massage and caress them as she swallowed, squeezing them hard. Each time she squeezed she felt more and more mass in her hands, giving her more sensitive skin to rub. Chachamaru moaned with her efforts, she was in ecstasy feeling her body grow fatter with her own hands.

It was quite a show for Satomi as well. She had resigned to watching Chachamaru turn into a glutton, sitting down on her chair to get a full view of the show. Her own cheeks were blushing as a hand crept south, getting turned on by the sight. With her mouth opened in a daze of lust, Satomi was keen to realize her own weight gain, letting a second hand give herself a soft belly rub. Meanwhile, Chachamaru's hands went down as well, feeling as the mixture filled up her rear. She could feel her butt cheeks start to press into the seat as pounds of adipose rippled into her thick ass. Chachamaru sucked the fattening goo without abandon, feeling her lower half become positively pear-shaped, round and thick. Her thighs became wider as well, the inner folds of her legs close to touching as they swelled outward. Fat piled on her hips until they were as wide as her shoulders. Her hands were going crazy, running over every expanse of billowing fat.

Chachamaru was breathing heavily, the large amount of food coming into her system was amazing, but was becoming too much for her. Luckily, the mixture soon faded, leaving the exhausted gynoid in her chair, eyes half-lidded in a bevy of erotic pleasure. Satomi stood up, stumbling a bit from a mix of arousal and unbalance, before going over to undo Chachamaru's tube. It appeared the force of the tube had changed her face as well, as Chacha's lips now were thicker and plumper before. When she closed her mouth for the first time in a while, they created a sexy pout that glistened in the light. With Chachamaru still in a daze, Satomi took the opportunity to explore the new body for herself. Soft hands lightly grazed over fifty new pounds of flesh, lifting up pooching bellies and hefty breasts. They probed the fuller butt and thicker thighs, her face getting closer with each stroke. Without realizing it, Satomi's tongue slowly made its way out of her mouth, getting closer to the sensitive skin. She inched closer, wanting to see just how tasty Chachamaru had become, but then she woke up.

"Mmwha?" she said, coming out of her blissful sleep. Satomi looked up, her tongue still out of her lips before closing her mouth. She chuckled sheepishly before standing up, handing Chachamaru some clothes.

"Well, that was a lot more than I wanted to run initially, but I'm extremely pleased with the results." Chachamaru nodded as she attempted to place her uniform back on, struggling to get her skirt back on over her callipygian form. With a few hops and grunts that made her fatter breasts and belly wobble, she was able to shimmy the skirt on to cover most of her butt. The top few inches of her butt had to go uncovered, and she had to forgo underwear in order to make it fit, but she was able to make do. Her shirt was even more of a challenge, being unsuited for her thicker form. She again had to leave her underwear off, making her able to button a few buttons, but it was a scant fit at best. Fat bulged out from under the seams, threatening to burst apart at any second, and her belly was fully visible. Chachamaru didn't mind at all though, she liked it this way, having her new sexy body be fully on display.

Satomi smiled as she could see Chachamaru's happiness. She gave the droid a slap on the bum, getting her attention. "Well, you seem pleased with yourself. So, what were your plans for the rest of the day?"

"I require a moment to speak with Chisame, is she in her room?"

"Hm? Oh, yeah, she's in there, but she's busy doing her idol thing that she assumes I don't know about."

"That is fine. This is of importance, anyway. Negi-sensei requested I speak with her."

"Oh, okay then. Good luck." With a shrug, she watched Chachamaru turn around and open Chisame's door, heading inside. Satomi looked from left to right, before sitting back down. She grabbed the tube Chachamaru had placed down and licked her lips.

Ten minutes earlier...

Nodoka Miyazaki had just gotten back from the bookstore. She placed a tome on her table, along with a bag of clothes. The blushing, purple-haired wizard sat down and flipped through the book, her wand in her other hand. 

"Engorga maximus," she whispered to herself. "This spell is used to force rapid weight gain upon the target. Sounds right." Nodoka took a deep breath, looking at the preparations needed for the spell. It all seemed simple enough. Her roommates were busy, leaving Nodoka all to herself. She placed the book back down, leaving the spell page open. She stood up and grabbed her wand, preparing the spell.

"Lucrum pondus, tumesco maior, adepto plenus. Amplus! Teres! Mollis!" (Gain weight, swell bigger, get fuller. Larger, rounder, softer.)

Nodoka could feel the magic instantly coursing through her. A divine warmth surged through her being, starting in her chest, and leading all the way down to her nether regions, making the shy girl squirm slightly. Tingles went up her spine as arcane energy flowed through her skin, filling her with a sensation that she related to a million tiny bubbles floating on top of her. She took another deep breath and exhaled, a soft moan escaping through her lips. She covered her mouth in embarrassment, before wrapping her arms around her body, the tingles getting stronger. With her hands on her sides, she could feel as the spell took hold, starting to make the svelte girl grow.

Nodoka felt like she was getting sleepy, the sensation of fullness setting into her immediately. Soon she felt her hands start to fill with blubbering fat as it billowed out of her, magic creating fat where there was none before. She giggled as flesh billowed outwards, making her clothes stretch in a matter of moments. She had planned to take them off before her growth, but something compelled her to keep them on. The idea of her clothes stretching out before her, getting so fat they burst sounded really cute to her. Her palms took grip of her new thicker sides, inches of new weight that gave in to her grasp. She let a finger roll around in her belly button, feeling the digit get covered up by growing belly all the way up to the middle. She pulled it out with a 'foomp' sound, marveling as her innie now was an outie.

"Oh, wow, I didn't think this would feel so nice." She put her hands on her waist and moved them up towards her slightly growing boobs, watching her gut fall and bounce as she made the motions, giggling to herself all the while. Her shirt was so close to tearing now, the buttons were bursting at the seams. Blushing to herself, Nodoka traced her fingers along the gaps in her shirt, where the pudge was peeking through, poking herself throughout and laughing at the tickling sensation it created. She hugged herself and squeezed tightly, feeling her fat as she still swelled. It was like wrapping her arms around a large mound of pudding, so soft and delicious. With a hard squeeze she popped off the buttons on the bottom half of her shirt. 

Nodoka chuckled at that. "Wow, I'm really becoming a fatty. This is so comforting, I can see why Negi-sensei would like this." She laid back, feeling her growing body as weight started to form on other parts of her body as well. Her arms gained a bit of thickness, as did her boobs which started to press out against her bra. Despite being an a-cup, she had always worn one in the hopes she'd grow into it, and now it was true. Her nipples brushed against the soft cups of the bra, perking up as her chest filled the cups. Nodoka held her arms in front of her belly and tried to touch her elbows together, squeezing her bigger boobs so the pressed together. She looked down at the few inches of cleavage she now had and smiled. 

Nodoka fell back onto her bed, her feet dangling off as her calves and thighs thickened a few centimeters at a time, small ripples of pure magic coursing through her legs. Most of it settled in her hips, widening her stance as she spread her legs. Her purple panties gave her a wedgie as her butt got larger, the thin material of the underwear sliding between the increasing mass of her ass. With the advancing size of her backside, her body was lifted up, letting her rounding form hang more sexily on the bed. Her underwear were fully on display, her skirt getting pulled by her spreading legs. Her legs squirmed together, her panties rubbing against her thighs as the blubber multiplied as the magic ran its course.

The violet-haired girl felt like she was being tickled as the magic ended. Her hips grew so much they tore at her skirt. Nodoka reached down and pulled the rest apart leaving her in her panties. The experience was so pleasurable to her, she was starting to forget why she had done it. The magic was settling down now, adding another few pounds to her boobs, making the top half of her shirt pop open. The shock of the burst brought Nodoka back to her senses, letting her examine her new body in all its glory. She took of the rest of her shirt, leaving her in just some ill-fitting panties and a too-tight bra. With her wand, she prodded her new, rotund form, laughing at how sensitive she was. She laid back against the pillow and let the fat settle on her, feeling like she was sitting in a marshmallow. It was a fantastic feeling, but yet, Nodoka was unsatisfied. 

"I'm, I'm so big now. But I thought the spell was supposed to work even better than this?" Curious, she stood up again, falling to the bed immediately due to not accommodating her fresh weight. Carefully, she tried again, and was able to reach her book. "The spell is more effective if used around already large people, as the magic amplifies weight in a five meter radius." Nodoka looked at the tattered remains of her clothes. She had already been so lithe that the magic only added around thirty pounds to her. She needed more. "Chisame," Nodoka said to herself. If she was going to gain weight she had to go to the chubbiest girl in the class. Knowing now what she had to do, Nodoka got into her recently bought clothes. 

Putting on a new set of underwear, she found that both were too small, she had assumed too much of the spell initially. The stretchy pants she put on next were more comfortable, wrapping nicely around her plump legs, still leaving a fair amount of room to go. Her shirt fit nicely too, covering her up so nobody would see her weight if they didn't look too hard. With new resolution, Nodoka left her room and headed for Chisame's, which was a five minute walk from her dorm.

When Nodoka knocked on the door to Chisame and Satomi's room, she found it slightly ajar. Peeking in, the chubby girl saw the scientist sitting in her computer chair, typing away. She heard slurping sounds. Looking further in, the violet-haired bookworm say Satomi sucking on some sort of tube, and making very loud, very sensual sounds. Nodoka stepped forward slightly, and her fatter thighs bumped against a nearby lamp, knocking it over on the table. She shrieked, and Satomi heard the noise. The glasses-wearing girl turned around and saw Nodoka, still sucking on the tube. There was a pause, punctuated by a few more gulps of the weight-gain formula.

"Um, um, I'm sorry to bother you, I wanted to speak to Chisame and, and..." Nodoka tried to stutter out an excuse. She didn't know what Satomi was doing but could tell it was embarrassing. Satomi was shuffling papers around, trying to cause a distraction.

"Chisame? Yes! She's in her room," Satomi said as she buttoned up her shirt. "Go ahead, she's probably not busy," she lied, as she jumped up, pulling up her skirt with an extra pull. Sticking a doughnut in her mouth, Satomi briskly went to her room. "I'll be busy so make yourself at home!"

Nodoka looked around confused at what just happened. She had quickly become the only person in the sitting area, with Satomi and Chisame's doors shut. She shrugged and fully entered, shutting the door behind her. She made her way over near Chisame's door and knocked. There was no response. It was no matter to her though, the magic wouldn't affect Chisame, she just had to be in range. Nodoka set down the spell book on a table and looked for the page again.

Five minutes ago, Chachamaru had entered Chisame's room to quite a sight. Chisame was sitting in her chair with a glazed look in her eyes. A smear of chocolate and jelly sat on her lickable lips, and a trail of pastry crumbs fell all the way down to her cavernous cleavage. Her bosom had swelled from so many dairy delights that her top had ripped open. A small amount of black leather still covered her breasts, and her bra hung loosely, trapped by the globes on her chest. Her belly surged outward, sitting in her lap, firm and full. It had widened so much, Chisame had become partially stuck in her chair. Her legs were splayed out in a very unladylike manner, stretched to the limit from her widened thighs. One of the sprite's cameras was focused solely on her panties easily visible with the raised height of her skirt. Her stockings were in disarray. One had been pushed down as fat formed on her legs, while the other had been stretched and was starting to tear. Wrappers littered the floor around her. With a dazed yet satisfied look on her face, Chisame picked up the last slice of cake, thick as it was, and held it up to her face. She bit into it with ferocity, her eyes rolling in the back of her head as her tongue tasted that glorious chocolate richness. Frosting coated her teeth as she ate, one hand pushing the cake into her gullet while the other, coated with icing, ran down her boobs, collecting the leftover crumbs. Chisame brought the tasty digits up to her mouth and sucked them clean, her tongue wiping between the spaces between each finger. She didn't want to leave a single morsel left un-devoured, it might disappoint her fans.

Chachamaru examined this scene, recording it herself for future use. When the slice was halfway into Chisame's jaw, she gave a small burp. Covering her mouth with her hand, she saw Chisame look her way. Her eyes went wide, and she shoved the rest of the cake in one go. With a hard swallow the chunk of cake went down, making her stomach pop out another inch. She struggled to get out of her chair, pushing up with her hands, but her gut was wedged too far into the seat for her to move. She huffed and groaned, her face turned red, and eventually she gave up, slumping back in her comfortable seat. She went to speak, but a large burp escaped her lips. Blushing from embarrassment, she ignored it to speak with the cameras still rolling. 

"Chachamaru, what, what are you doing here?" She eyes the green-haired android, who looked larger since class ended. Even with the amount of weight Chacha had put on not moments ago, Chisame was now the larger of the two, but only slightly. "And why are you so fat?"

"Negi-sensei wished for me to speak to you about your weight gain."

"What, he thinks I'm gonna get health problems or something."

"Yes, but the main problem is due to his sexual fetish idolizing large women. You are becoming erotically distracting for sensei." Chisame blushed heavily at that, turning away from the rotund robot.

"Ooh, this is getting steamy, get some shots of green-hair there," said one of the sprites. They conjured a few more cameras to pick up both girls. It was at this point that Nodoka knocked, but nobody in the room paid it any mind.

"He, he thinks I'm hot, huh?" She said quietly. "I mean, so what? It's not my problem if he can't handle all of this, I'm not doing it for him anyway. But I can guess that's what you're doing!" Chachamaru was taken aback at how quickly Chisame saw the reasoning behind her upgrade.

"This is, it is an experiment, it was Hakase's intention."

"Uh-huh, sure. Lemme guess, he told you about his fetish, so you decided to make yourself fat so it would be easier for you two to have a relationship." Chachamaru's mouth opened and closed, trying to find the words. "Hey, I'm with you Chacha, Negi is a cool guy, but I can't stop gaining now. My popularity has never been this high! If I stop gaining, or even worse, lose weight; I'm gonna lose my ranking. But don't worry, with how fat you became in just an hour, I'm sure you'll be his mattress in no time. I bet it's gonna feel nice having his head resting between your big pillowy breasts, while he rests in your body like it's a warm blanket." Chachamaru's face started to overheat. "You better hurry up, I'm still bigger than you, you don't want his eyes wandering onto my sexy, voluptuous body, do you?" The android started to clench her fists in anger. "In fact, maybe I will seduce him with my ravishing form. All I'd have to do is motorboat his head right between this great tits and bitching belly, and he'd be all mine. No more homework, no more lessons. Negi conjuring food for me whenever I want and feeding it to me." Chachamaru's body started to steam. "And, no more having to use up all my AA batteries on my..."

"ADEAT!" Chachamaru shouted. Chisame was startled as Chachamaru summoned her pactio. A bright flash stunned her eyes, and when she reopened them, Chachamaru was in her magical outfit. Like Chisame's had earlier, the outfit refitted itself to suit the pudgy girl, the tubetop-like shirt was wrapped around her burgeoning breasts, showing the undersides of the rounder rack. The middle section, already meant to expose everything from chest to pelvis, now contained the stuffed, sloshy belly Chachamaru now carried. But, even accommodating for her chunky thighs, her ridiculously small short-shorts now resembled a pair of underwear, the parts on her leg riding up to groin-level. Her robotic cat ears sat on her head as cute as ever, but it was what appeared in her hand that made Chisame's mouth drop.

"Now, Chacha, what are you doing with that laser designator? We're inside you know!" Having an idea where this was going, two of her electronic sprites went and opened her window. 

"I have determined that you are too big of a risk. If you will not lose weight, the only option is to make you so fat that you cannot see Negi-sensei. It is against his wishes, but my body should serve as adequate compensation."

"What?! Hang on a second, let's talk about this!" Chisame's hands went to her keyboard, and she quickly typed something out. 

"Don't talk, eat." In that moment, three things happened. Chachamaru's finger hit the trigger, sending a signal to a satellite in space that was aiming at Chisame's bedroom. Chisame's hand hit the ENTER button on her keyboard, running a program using the power of her pactio. Nodoka's mouth uttered the magical phrase that would give her even more weight.

"Chachamaru, did you just order a laser to be sent to my room!" Chisame screamed.

"Negative. My creator has invented a most wonderful creation, I think you will enjoy it." Chisame heard a rumbling as she turned her chair to face the window. Hurtling out of space was a thick, accurate stream of white gloop.

"Wha?" Chisame said, before her mouth was filled by the creamy mixture. It rocketed past her lips and down her throat, stuffing the poor girl even more. Her chair was pushed back by the force of the torrent as her sides started pushing further into the arms of the chair. The formula was so thick, Chisame was unable to close her mouth, forcing her to swallow it over and over, sending pounds of new weight into her. The chubby idol was starting to get dizzy from having to eat so much food so quickly. Fat soon was forming all over her body. Besides her rounded stomach getting even larger and firmer from being so full, she soon started to expand everywhere. Adipose rolled down her sides, starting to pour out of the arms of the chair. Rolls of fat started forming on her back and down her ass, making ripples as it grew. Her face got rounder as  she started gaining a small double-chin. Somehow, she still looked adorably cute with it. 

Chisame was started to enjoy this sensation. Partly because she was seeing donations skyrocket, but mostly because the food in her mouth tasted so good. It was without a doubt the sweetest, richest, creamiest thing she'd ever eaten. She sat without a care as her breasts swelled to the point where the last remnants of her shirt fell off, showing her puffier boobs to the world. Her stomach now laid almost down to her knees, sticking over a foot in front of her. Her boobs were massive, at least the size of her head, and they sat on her stomach likes balls on a shelf. Chisame's enormous ass was so filled with jiggly cellulite that each swallow of the pudding-like mixture sent ripples down the rolls of her back and down into her butt, where they radiated outward in a hypnotizing fashion.

She couldn't help but rub her belly and jiggle it. Chisame gave it a slap and watched it barrel across her lap as it gained even more. As her fat increased she accepted her fate to become obese and got into it. She ate the concoction without remorse, and picked up the pace when the vanilla was replaced by chocolate. Apparently there wasn't enough of the original flavor to fully stuff the orange-haired girl. Chisame picked up her breasts and squeezed them hard, feeling them squish in her grip. Her nipples grew thicker and longer as her breasts swelled, now well beyond the size of basketballs. Even her lips were getting bigger, making her mouth look sexier as she gave a seductive pout, hefting up a boob and giving it a suckle. Her other hand went to her skirt and pulled it off, since it was already close to breaking. She lifted her over-developed legs to show off her cute panties before they were blocked by the increasing width of the inner folds of her leg fat. Her girth was so tremendous at this point that the chair was straining, almost about to break. But Chisame kept swallowing, kept getting closer to forever being the fattest idol on the net.

Chachamaru was watching this with bated breath when she felt a tingle run through her body, building up strength until she felt like her whole body was vibrating. She looked at her body, trying to figure out what was wrong, when the buzzing got so strong that she had to fall to the floor on her back. Chachamaru cried out from the feeling as her body started to pulse from the feeling. Soon, her whole body felt like it was inflating. All the skin on her body was growing, filling with fat. She touched her belly as she felt it raise upward, as her back arched from the vibrations. She attempted to press everything back in, pressing on her stomach, only to have it pop back out farther. Similar attempts on her boobs and butt were futile. When the fat started forming on her arms and legs, and the vibrations got so intense she was unable to move, Chachamaru realized what had happened. She had been hacked.

"Chi-chisame, what, oooh, what did you, you, you, mmmm." Her mouth was unable to form words as the buzzing in her body reached its zenith, paralyzing her with the pound-packing pleasure. As she got rounder all around her arms and legs splayed apart, leaving her in a spread-eagle position. With each pulse of the hack she pulsed upwards, humping the air as her hips twitched up. The new flesh was focused around her ass and hips, making her butt press deeper into the carpet as it gained pound upon pound of adipose. Her legs lengthened, pressing the girl up against the door behind her as she stretched out. Her skirt tore open as her hips reached past her shoulders. Her hands grabbed full slabs of sexy meat, her slim fingers becoming plumper as they dug in, feeling the buzzing in her pelvis. She groaned in pleasure, this feeling was fantastic, like being charged by magic but a million times better.

"Oh, wow, nngh, so, ah! Amazing! Ahh!" Chachamaru gave in to the vibrations, letting them caress her into a blissful state. Across her arms and her back, she felt her whole body getting heavier, pinning her to the ground. Her arms grew as thick as her legs once were, back when her thighs were smaller than logs. Chachamaru's back swelled outward into the carpet, she sensed every fabric of the carpet rubbing into her sensitive skin as it multiplied. She soon grew a double chin that formed on her enlarging neck. She moaned as she felt another electric surge go through her body. Her voice had deepened slightly due to all the fat, becoming huskier and more sultry. Lost in a daze of lust, she grabbed her already-strained shirt and ripped it off, leaving her naked on the floor. As her boobs reached the size of basketballs, Chachamaru was amazed at how her vision was blocked by her massive chest and belly that was now almost as big as Chisame's. She was soon as big as the bespectacled girl, but Chachamaru's rear was far bigger. Her thighs easily touched all the way down to her knees. The buzzing in her body made the sensation stronger as she rubbed them together, feeling her body heat up from excitement. Each cheek was only a bit smaller than her belly way, and even rounder. They stuck out over a foot behind her, making her back lift up in the air.

When Nodoka activated the spell, she felt the reaction start much sooner than it had before. She found herself giggling uncontrollably. It was like a million hands were tickling her all over. She felt new paunch develop on her body. Her loose, super extra large shirt started to tighten with her sprouting bust. The violet-haired girl saw her nipples harden into the cotton, and as the material stretched, they started to poke through holes in the material. As the shirt lifted up from the growing spheres of her bosom, her belly became visible once again. She had to pull her breasts away to see it growing before her. Everything was increasing at an incredible rate. She ran her hands all over her body. She was still in love with this feeling. It was the most pleasurable sensation she'd ever felt. The feeling of her sweatpants starting to clasp her blimpy butt cheeks. She started to get a wedgie from the crotch of the pants starting to ride up, but again she enjoyed it.

"Negi-kun is a genius! This feeling, being so fat and sexy is the best feeling ever!" She cried out in joy as she rubbed her belly, seeing and feeling her arms thicken until they wobbled with every movement. She shook around and marveled at the feelings of her chest and back getting heavier, swishing around as she bounced up and down. In a matter of minutes, she had already gained another thirty pounds, making her shirt reach the breaking point. Nodoka was ecstatic to see how much she'd grown, and laughed heartily. Her laugh was a bit deeper than normal due to the fat changing her face, so her cute face was even more lovable than it had been before. Plump cheeks gained a permanent red blush to them as her neck widened. She started to get a bit worried. She had now gained over forty pounds, and though she loved how big she got, and how much quicker she gained, she didn't want to get too fat.

Almost on cue, the speed of her growth doubled as Chachamaru's hack took hold, increasing the amount of weight the magic would acquire and place on her lovely, shapely body. Her stomach spread all the way to the sides of her torso now, creating thick love handles big enough for two Negis. Ignoring the thought of having more than one precocious crush groping her and feeding her whatever she wanted as he rested on her belly, Nodoka chuckled as the tickling got stronger. She moved closer to Chisame's room, trying to get some balance, but her legs were so big it made it hard to walk. Her sweats were now tight against her legs and starting to stretch, intensifying the tickling. Her shirt was tearing across the middle, splitting between two sections. One covered her mammaries and the other protected a few scant inches of gut. The second section quickly became a single strand of fabric as her burgeoning belly stretched it apart. Her boobs continued to grow until they too popped out of her shirt, making her puffy nipples show. She tried to cover them and was shocked when she could barely reach her nipples. When she tried to do the same to her belly, she started fretting when it was so large that she couldn't reach halfway to her belly button.

"Oh gosh! This is way too big!" Nodoka, in worry, tried to open Chisame's door to get help. She opened the door and managed to squeeze herself through, her soft form making her malleable enough to fit. She gasped at the state the two girls were in. Both girls were going crazy. Chisame was a moment away from outright pleasuring herself in front of millions of people. Chachamaru herself seemed on the brink of climax as she seemed to be writhing on the floor. The geek and the gynoid were both so engrossed in their own gain they didn't notice the bookworm. She saw both girls still gaining weight and freaked out, knowing they were the reason she had gotten so big. Nodoka turned around and tried to run out the door, but couldn't quite fit. She had to turn to the side, letting one breast through at a time. When her large chest was fully out of the door she tried to push through, but her swollen tummy stopped her. The frame couldn't hold her incredibly wide hips, and pushing back wasn't an option as her boobs had expanded again to the point they couldn't fit through the door again.

Satomi had heard the sounds and came out of her room to investigate. Her first sight was Nodoka stuck in a door, her massive body keeping her trapped as she continued to stress the frame of the door with her escalating weight. She saw Chachamaru on the floor, writhing in ecstasy as she became a naked mass of seductive fantasy. Lastly, she saw Chisame, engulfing what appeared to be over 100 pounds of her own mixture, her mind obviously foggy from the sensation as she rubbed her body all over, putting on a show for her viewers and the girls. When she came upon the three fattening ladies, her initial reaction was arousal, then intrigue, and finally alarm. She quickly ran to her room to ring the child teacher.

All three girls were continuing to grow now. Chisame's hand was now trapped under her stomach that reach over a foot and a half in front of her, but it was fine with her as it allowed her to satisfy the burning desire the delicious taste in her mouth had wrought. Her other hand was giving herself a belly rub, soothing her aching stomach as the flavor switched to strawberry. The super sweet fruit flavor brought another high-pitched moan to the girl as it ran back down her throat. One of the chair's arms started to creak and soon bent from the overweight girl it was trying to hold in. Her lips, trapped around a stream of ambrosial wonder. Sitting naked in her chair, eating the most delicious thing to ever exist, this was heaven.

Chachamaru would agree, and her mouth was watering at her desire to have it stuffed full of food. her tongue hung out of her mouth as she let the buzzing vibrations of her body wash over her. It was like an erotic massage of untold boundaries, each movement of her rubenesque being creating ever-increasing mounds of pillowy softness. Everything, from her hands to her feet, was larger and softer. If she could move past the enormous trembling she would no doubt be exploring all over her body. Her dimpled ass was now even bigger than her incredible belly, each cheek bigger than both of her impressive breasts. It raised her so high up her back was at least a foot off the floor, and it pushed her belly up too. Her face was bright red as she looked at her belly fully eclipse her vision. It raised so far above her body it pushed her bosom into her face, and she immediately started to lick and taste herself. Chachamaru had desperately needed something to satiate her hunger, having it be her own body was just icing on the mouth-watering, twelve-layer cake.

Nodoka's laughs were now more sporadic as she tried to fight against the will of the magic. Each titter was caused by another couple of pounds being slapped onto her body. The force of her gain was more intense than the other girls, her belly was already larger than both of theirs. It pressed heavily into the sides of the door, threatening to break it. What remained of her shirt was little more than a few strands of string, and they soon ripped off. Her sweatpants still held on, as her legs didn't grow as much as the rest of her, but they still felt tight in her pelvis and had holes all around. The sensations were making you dizzy, and she was still laughing.

"No! Hehe, this is so, haha! Bad, I mean, how, hehehe! Oh, oh, I don't care anymore!" Nodoka gave in to the tingles for the rest of her growth, smiling and laughing as she felt every expanse of her new body. Negi burst though the apartment door a moment later, and came to quite a sight. All three girls expansions died down. Chachamaru's hack ended, as did her assault on Chisame's taste buds, and their halted growth allowed Nodoka to finally stop. Her final size was so immense that she finally cracked the door, allowing her to fall on the floor, her stomach acting as a comfy cushion. Negi slowly walked around and gawked at the scene. Nodoka laid down on her belly, easily bigger than her body had been originally. Her boobs and butt were of a good size too but her belly was the biggest feature on the violet-haired girl.

Chachamaru was on her back, or more accurately her giant ass, panting. Even though the changes had stopped, she had become far too exhausted to move. Her whole body had grown out, making her look like an inflated doll with huge tits and a giant tummy, with a rear that would take days to explore. Of course, there was Chisame. If Negi had to pick out her biggest feature, it would have to be her breasts. They were gigantic, milky mounds that rested on a huge shelf of a stomach. Her pudgy arms and legs were so wide she couldn't reach more than a foot around her, and even her face was like a peach, and just as pink. In an afterglow from the experience, she turned her head to see the young boy.

"Wha? Negi?" She asked. Chachamaru and Nodoka finally noticed the young boy as well.

"Negi-sensei, I'm afraid I have failed in the task you assigned me. Allow me to comfort you in exchange for my failure," said Chachamaru.

"Um, Negi, do you, need to take a nap? I, I, I could be used as a pillow if you wanted," said Nodoka.

"So, Chacha said I was distracting you," Chisame said. "Well, what do I do to you now?" She asked with a mix of humor and lust in her voice.

Negi looked at all three girls, one after the other. He started to speak, and then his glasses fogged up. He took another look at the girls, and promptly passed out onto Nodoka, a hint of blood dripping from his nose.