The Biggest of Nijigasaki (XWG, USSBBW)

Shioriko was the new Student Council President, after tallying all the votes. Setsuna wasn’t too interested in continuing her tenure as president to begin with anyway, so it was a fairly easy win. As things started to change around, Setsuna sat down with Shioriko to have a chat about certain…duties.

One thing that became immediately clear in the differences between the old and new presidents, their weights. Shioriko was fairly average in size, but Setsuna was massive, almost a half-ton heavier. Nijigasaki had become a school of fatties, and as Student Council President, Setsuna had to be the fattest. Setsuna started her tenure as president half the size she was now. However, the Idol Club had become a club where the fattest members of the student body gathered, and got even bigger. Setsuna struggled to keep up with the likes of Karin, Emma and Lanzhu, but managed to remain on top.

“...So now that you’re the president,” Setsuna explained to Shioriko, “You’ll have to become bigger…a lot bigger.”

The two were chatting in the Student Council room, sitting across from each other on the room’s couches. Shioriko looked absolutely miniscule in comparison to the massive Setsuna. She was taking up almost the full length of the couch with her massive hips and butt, and her belly was pooling onto the floor. Her chest was equally oversized, her school uniform having become a makeshift bra.

“Mm, I understand, but…” Shioriko gave herself a once-over, “It will take some time before I’m well…big enough…”

“Hmhm~! Don’t worry! I’ll be helping you every step of the way!” Setsuna said, “You might want to prepare your stomach…” Setsuna winked, then giggled.

Shioriko gulped, surely Setsuna wasn’t going to feed her that much right away, right?

…right?

---

It had been a rather brutal time for Shioriko. Setsuna had made good on her words, and Shioriko did try to prep, but it was all meaningless. Shioriko ended almost everyday stuffed to the gills, even the slightest movements would upset her super-taut belly. Shioriko knew that it was all part of the duties she had to take part in as the new Student Council President, and the results were helping her motivation too.

Shioriko had gained a lot of weight already, well beyond what most people would say is chubby or fat. But by Nijigasaki standards, Shioriko could still be considered quite thin. Her belly poured over her waist, and was just about to her knees. It was splitting into a pair of big rolls, but wasn’t distinct enough yet. Her boobs hadn’t seen too much growth, comparatively, and were absolutely dwarfed by Setsuna’s massive pair as of yet. Her lower-half however, was proving to be a charm point, seeing significant growth. Her thighs were squished together, rolls forming regularly, and her calves were swelling with fat, close to touching each other. Her meatier thighs had turned her walk into a waddle, something she’d have to become used too as she continued gaining. Her butt was equally flabby, each cheek already outsizing basketballs. A pair of chairs was needed for Shioriko to have a comfortable seat. Her school uniform quickly became tight, even losing a few buttons from her sudden weight gain. That was a rather embarrassing day, but Shioriko managed.

Despite the rather intense training (not that Shioriko could complain), spending so much time with her formal Student Council President rival was quite fun. It hadn’t been too long, yet watching Setsuna demolish mountains of food in what felt like seconds was…attractive, Shioriko thought. She wondered if Setsuna found this fun, eating and gaining such hyperbolic amounts of weight, or if it was just another duty as President.

“Sho…ghetting ushed to your shize yhet?” Setsuna asked, mouth full of dessert from today’s third buffet.

“Mmf…I suppose so, but…” Shioriko said, “It’s a little tiring getting so big so quickly…”

“Mm…I totally get you!” Setsuna said, “When Karin-san started getting super close to my weight, I really had to shovel down! And that was just to gain a few hundred! You’ve got a lot more to go…”

“I will do my best,” Shioriko said as she stared down her latest plate. A pile of meat and rice, just like her previous plate, and the numerous she’d had at the last two buffets. She still had a plate of sweets to get through as well…and Setsuna was already onto her fourth plate of sweets. Shioriko almost just wanted to watch Setsuna eat, but that would get her a mild telling off from Setsuna.

---

“Uuf…” Shioriko could hardly walk as the pair waddled out of their final buffet for today. They were lucky to have time off from school to plump Shioriko up, or else their kind of progress wouldn’t be so fast.

“...Would you mind one more stop?” Setsuna said, hardly having any issues after stuffing herself silly, “It’s not another buffet.”

“Mm? Then what is it?”

“A…pop-up cafe for this one anime,” Setsuna said, “The food’s quite cute! I can tell you about it on the way!”

“...Is it far?” Shioriko asked, “I’m not sure how many steps I have in me.”

“Ah, no!” Setsuna said, “It’s just down the street by the station!”

“I see…then…I’ll probably have room when we get there…”

“Good! We might just clean them out then!” Setsuna said, winking, “They close pretty soon though, so we gotta hurry!” Setsuna then started waddling quickly toward the cafe. How much stamina did she have?

“W-Wait, Setsuna-san!”

---

Shioriko, dedicated to her newfound duty as Student Council President (and her newfound gluttony), continued to get bigger and bigger. She was approaching the quadruple digit mark, a dizzyingly large weight for anyone to be. Despite this, over half the Idol Club was beyond this mark, and Shioriko had yet to outweigh them. She was certainly closing in though, as her body showed.

Walking was a rather difficult task for her now, her legs had thickened up a lot, becoming two flabby pillars. Single-sized doors were a challenge for her, requiring an alternate entrance or a lot of struggling (Setsuna didn’t mind pushing her in though). It was hard to tell where her thighs ended and her calves began, as it all started blending together. Plus, Shioriko’s belly had sunk below her knees when she stood, so a clear answer was a bit difficult to find. When Shioriko sat down, her belly was about ready to spill off her legs, and it provided an easy-access table (her proportionally smaller chest only emphasized this).

Speaking of sitting, Shioriko’s butt was unsurprisingly oversized as well, and there was quite the celebration when she broke her first chair. At her size, even two chairs were starting to feel like too little, especially ones with armrests. Her flabby arms couldn’t even reach those anyway, not that she really had much opportunity to rest them with how much food Setsuna was pushing on her.

With Shioriko’s deteriorating mobility, Setsuna had suggested moving into the dorms for easy access to school. Setsuna had moved into the dorms some time ago, for the same reason. Shioriko wasn’t entirely on board, so Setsuna had suggested a bit of a slumber party with the other idol club members who slept at the dorms. Laznhu, Mia, Emma and Karin had joined the pair in one of the dorm’s common spaces. It was a tight squeeze, but they all managed to fit in, along with the massive stockpile of food they brought. A large chinese buffet from Lanzhu and Emma’s fleet of baked goods and sweets paired for a rather filling combo.

“This is…quite a lot of food…” Shioriko said, firmly squished between Lanzhu and Setsuna. She had flab oozing over flab on all sides…it was a bit overwhelming. While Setsuna was the fattest in the room, that didn’t mean the others weren’t massive. Lanzhu was rather close to Setsuna in size, her chest a bit larger (if you looked, which Shioriko was quietly doing so).

“Mhmm~ Have to make sure the new student council president is well fed, after all~!” Lanzhu said, “So this buffet’s a bit special~”

“And I made sure to make extra today!” Emma said, who was sitting next to Karin, “So make sure to eat lots~” Karin was already scarfing down buttered buns whole.

“R-Right…” Shioriko was becoming more and more overwhelmed by everything around her. The unabashed gluttony, all the jiggling…Shioriko was feeling hot, and she was pretty sure it wasn’t from the heat of the room. She hardly noticed as Setsuna and Lanzhu passed food to her that she subconsciously ate and swallowed. Forkfuls of meat and veggies and entire pork buns found themselves in Shioriko’s gut. She was eating it all without a word, quietly enjoying the pampering.

“Hmph, we’ll have to have burgers and fries next time,” Mia said, decidedly eating the least of the six.

“Hmhm~ Maybe~ I’m sure Shioriko won’t mind either way,” Lanzhu said, grabbing a bit of Shioriko’s exposed belly. This elicited a small yelp from her, not used to having her belly be so sensitive, but it felt good…

“Lanzhu, Shioriko’s my feedee, y’know,” Setsuna then grabbed a similar roll of flab on Shioriko’s belly, “I can fatten her up on my own just fine!” Shioriko could hear the twinge of jealousy in Setsuna’s voice. It was oddly comforting having Setsuna be jealous of Lanzhu over simply feeding Shioriko.

“I actually do prefer…Setsuna’s style of…um…feeding,” Shioriko said, “It is rather relaxing.”

“Oh? I see,” Lanzhu smiled, “I see what’s going on then~”

“Hm?”

---

After their rather massive dinner, Setsuna gave a tour of the dorms, which had a number of extra facilities. Some were expected, like washrooms or kitchens, but others were explicitly for gaining weight.

“And this is my room!” Setsuna said, as she guided Shioriko into the spacious room, “Well…it’s actually for whoever the student council president is, so I’ll be moving out soon…”

It was very Setsuna, was Shioriko’s first thought. There were numerous anime posters, figures, and other merch scattered about. A desk that looked to have quite the elaborate set-up for gaming, and the chair was unsurprisingly wide. There was a fridge and pantry likely loaded with various foods. Setsuna’s bed was also quite big, looking wide enough for two Setsunas.

“It is rather big…” Shioriko said, “and this would become my room?”

“Yep!” Setsuna said, “Though the other rooms aren’t that much smaller, actually…”

“I see…”

“So, all that walking we did must have worked up an appetite, right?” Setsuna said, waddling to her fridge.

Shioriko’s stomach answered for her, as it loudly grumbled. Despite eating enough food to probably feed a small town at dinner, Shioriko was still quite hungry. Shioriko flushed a bit at her stomach’s demands, before waddling over to a nearby wide chair.

“Hehe~ You’ve made so much progress…” Setsuna said, as she plopped down across from her, a number of sweets in her arms, “A good Nijigaku President should be a big glutton~”

“Mm,” Shioriko nodded, “I appreciate your help in making me one so quick. I would not be half this size were it not for you, Setsuna.”

“You think so?” Setsuna said, “You wouldn’t have gotten into Nijigasaki without an inner glutton~ I just unleashed it~!”

“Hmhm~ Maybe…” Shioriko said, before pausing, “I think I’d like to stay at the dorms…”

“Oh? That’s great! What settled it for you?”

“Well…the food, for one…” Shioriko said, “But also…” Shioriko had started blushing.

“Also…?”

Shioriko cleared her throat, “Ah…you, Setsuna…”

“Me?”

“I believe I have developed…mm…feelings for you,” Shioriko said, her voice a little nervous, despite her expression being rather neutral (minus the blush).

“Huh!? F-Feelings!?!” Setsuna was a bit taken aback by this.

“Y-Yes…”

“That’s awesome!”

“Eh?”

“I’ve been having so much fun with you! Even after you finish gaining, we should still hang out…maybe romantically too…” Setsuna was getting a little red now too.

“Sure…”

“Ah, I got it!” Setsuna said, “Why don’t we become roomies?”

“...Is that allowed?”

“Mmm…no,” Setsuna said, chuckling, “But I can just come up a whole lot from my room!”

“I suppose so…”

“That’s settled then!” Setsuna said, “Now let’s make sure you’re all filled up~”

---

Well, it finally happened.

Shioriko was officially Student Council President, and the fattest student. It was currently only by a few pounds, but biggest is biggest. Shioriko had been eating countless meals around the clock, and living in the dorms only made her fatter faster. Between Lanzhu and Emma’s food, and the generally fattening food served by the dorms, Shioriko couldn’t help but put on weight.

Cracking more than just the half-ton mark, Shioriko was approaching the 1500 mark quickly. Walking was a massive pain (more than it already was), with her titanic thighs finding some double doors a bit challenging. Her legs more resembled a pair of fluffy stacks of pancakes than actual legs now. Her thighs were soft and doughy, and were so overfilled with flab they were overflowing and partially hiding her knees. Shioriko’s belly was touching her toes, which made finding any uniform that could properly cover her nigh-impossible. Even the largest possible size was only big enough to cover her comparably modest chest. Her arms were more like big hams, and mostly suited to feeding herself more than anything else these days.

Today, Setsuna and Shioriko were in the Student Council room, which felt smaller than when they first discussed Shioriko’s gain. Rather than sitting on opposing sides, they were next to each other, which made the bench creak loudly. It was a bit of a tight squeeze, as any space between them would result in some butt fat hanging off the side. Not that they really wanted to be apart.

“You’ve gotten so big, Shioriko~” Setsuna said, grabbing a handful of belly, “I can hardly believe you used to be so tiny~”

“Mm, it’s quite the change from before,” Shioriko grabbed some of her own belly, “Before I was so intimated by it all, but now…”

“You only want more~?” Setsuna said, to which Shioriko nodded, “Good, I wouldn’t let you lose a gram!”

“I probably couldn’t if I wanted to…” Shioriko said, “Practically living with you, I’d only be gaining…”

“I hope you can keep up then…” Setsuna leaned over for a kiss, her pudgy fingers grabbing bits of Shioriko’s flab. It was so soft, she could hardly resist it all, regularly moving her sausage-like digits around, shoving them between rolls. It was a bit of a struggle to lock lips at their size, but they managed well enough (it was easier in their bed). Shioriko was similarly feeling up Setsuna, who hadn’t been slouching in weight while feeding Shioriko. She was so soft and still so energetic, it was a bit of a miracle.

“Ah, Shioriko-san I-” Yuu said as she entered the council room to ask a question, only to be met with a rather steamy make-out session. Neither had heard Yuu enter, so she simply awkwardly walked out.

As things heated up, the bench snapped like a twig. Shioriko was still getting used to being so big, and Setsuna certainly wasn’t helping. But after it was all said and done, they went right back to making out.