It was all Jill had been told her entire life.

“You’re so thin, Jill!”

“Wow Jill, you’re so skinny!”

“Jeez Jill, way to make the rest of us feel bad!”

Jill couldn’t help it. She’d always been thin. Tall and thin. Rangy, even. She had long brown hair that swept down over her shoulders, large, deep brown eyes and a shy smile. But she was incredibly slender, that much was impossible to ignore.

It gave her whole being an unmistakable air of frailty, when in fact Jill was tough. She’d gone to medical school, was now in anaesthetics, made a shit-ton of money and was well-respected by her peers, especially given how young she was.

And yet every time she ate lunch in the canteen, she’d get raised eyebrows. Jill ate a lot: burgers, pizza, hot dogs – she was a massive fan of junk food. And it just went right through her. Larger folks would look at her gorging herself on the tastiest of terrible food, and would regard her incredibly thin frame with jealousy and bitterness.

It wasn’t Jill’s fault. She’d exercise if she needed to – she liked running. But when you were as thin as she was, running regularly wasn’t a good idea; it could even be dangerous. So she tried – she actively tried – to eat as much as possible. She wanted to put on weight – maybe even have some breasts to speak of at some point, instead of the bee-stings she currently sported – but no matter how much she ate, nothing stayed.

It was starting to get her down.

But Jill was nothing if not determined. She would put on weight, by any means necessary. Luckily, she had lots of friends from medical school who she could hit up for advice. After many such chats over coffee, one of her friends who specialised in nutrition mentioned a formula that extracted all the fat and sugar from any food ingested, and stored it in the body. It was a bastard chemical created when experimenting with insulin, and was intended to remove fat and sugar absorption completely, but ended up doing the inverse.

Jill’s friend handed her the vial full of the compound. “Effects last 24 hours”, she was told. Jill rushed home, as her friend tried to do the whole “beware of side-effects” and “oh, but it’s not been tested” crap – Jill knew that was coming, and she’d considered the risks. C’mon. She was a doctor.

On the way home, Jill stopped by the supermarket to pick up the most fatty, sugary crap she could lay her hungry eyes on. Jill loved food, and one of the few benefits of being so thin was that she could eat all the tasty shit she wanted. But the idea of it actually having an effect on her crazy metabolism was even more exciting.

Doughnuts, pizzas, full fat soft drinks, a couple of bags of sugar, cheese, bread – Jill bought a ton of all of it, and carried the bags to her car. She watched her thin arms shake a little with the weight of the food, and imagined what she’d look like filled out. She couldn’t wait to see.

In the car, she sat looking at the passenger seat where the vial of serum lay, waiting for her. Her chest was pounding. She had the apparatus she needed; she’s grabbed a packet of syringes from work. She could do it now. She would. She’d do it now. She saw the glow of the golden arches across the highway. She’d christen her new metabolism with a massive McDonald’s. Perfect.

Taking the vial of green liquid, she placed it in the cup holder by the driver’s seat, grabbed the packet of syringes, unwrapped one, stabbed it through the cork stopper of the vial, got a nice big syringe-full of serum, jabbed it in her vein and pressed down.

She watched the green liquid enter her bloodstream with a mixture of trepidation and satisfaction. This was it. Time to put on some weight.

With renewed confidence and vigor, Jill drove back onto the highway, emerging a couple of minutes later at McDonald’s.

“Big Mac Meal, largest size you got. Coke please. And an apple pie. And a McFlurry. Don’t care what one.”

She pre-empted each one of the confused server’s questions, and paid for the meal. Her heart was pounding as the food arrived, bit by bit. Watching the massive drinks cup fill up thrilled her. She was going to get big! Maybe even a bit fat – why not? She’d be careful after a while, but the chance to experiment was delicious.

Speaking of delicious, the food smelled incredible. Jill was suddenly incredibly hungry. Was this a side-effect? Either way, she started to dribble, grabbed the tray of food, picked up some sauce, and sat down close to the counter, and started eating.

It tasted incredible. Better than anything she’d ever eaten. Every fry was like molten gold, the coke was sparkling in her mouth, and the burger! The most succulent “beef” she’d ever had. Jill crammed more and more food into her mouth, unable to believe how good it was.

And slowly, her jeans began to tighten. Jill had no idea, of course – she was enraptured by the effect of the serum on her metabolism, but her body was sending the fat and sugars from the food to two places in her body. Well, three to be exact.

Jill fiddled absent-mindedly with her bra strap, which was tightening and pulling at her slender frame. Her white button work shirt was feeling very snug around her form, and she squirmed in her chair as her jeans pulled against her butt. Why were they suddenly so uncomortable? Her chair started to creak and her body converted the food into pure mass. Jill didn’t realise, but she was growing bigger and bigger.

Jill picked up the box of fries, lifted it above her mouth and patted the end, encouraging any extras to come out. Salt flecks fell onto her tongue, and she swallowed hungrily. A single fry fell out, missed her tongue and landed on her chest. Jill looked down, shaken from her greedy reverie. Hold on a minute. Did she have a chest?

Jill looked down to see two large, perky breasts stretching her white button work shirt out against her slim figure. Her bra was crammed tight against the front of her shirt, and her two nipples were poking out through both bits of fabric. Her boobs were big. Large, even. They looked like two softballs stuffed down there, and her bra certainly couldn’t cope. She could see the bulge of her tits spilling over the cup, and her buttons were being pulled apart by the sheer width of her chest.

She could even see it expanding and she slurped her coke (throughout all this she never stopped consuming) and she could see the fry slowly move as her breasts shuddered larger and larger, stretching her shirt ever-tighter as her tits ballooned bigger. Gaps began to appear between her buttons as her breasts blew up even bigger.

Jill was so consumed by hunger she didn’t quite know what to do. Her thighs were now quite close to the rim of the table for some reason, so she pulled her chair out, took the tray to the counter, and said, simply. “Same again, please. Twice.” She held up two fingers for effect, and belched, hugely, patting her flat stomach all the while. Her hand disappeared beneath the shelf of tit that was emerging from her, her buttons pulling tighter all the while. Jill was dimly aware that she had what was now considered large breasts. She could also feel a pull in her jeans, and she tried to adjust them as she stood there.

As her hand moved down and worked across her butt, Jill felt confused. This was a lot bigger than she was used to. Her jeans were pulled completely tight across her swollen behind. Wow. It really was swollen. Her cheeks bulged out in two large mounds, and the waistband was pushed well away from her slim back – the base of her fat cheeks were pushing the jeans out, they were so big.

All this flowed through Jill’s head, and she vaguely related it to the serum, but then two trays piled high with food appeared in front of her. Jill went to grab her wallet, dribbling a little from the corner of her mouth, and found it to be completely wedged in her back pocket. Her butt was already so large that her pockets were almost impossible to access.

With a wrench of her hand that sent her expanding chest jiggling madly (the female server was almost drooling herself, staring at the fat tits in front of her), Jill produced her cash and walked away with both trays, her swelling breasts almost precluding them from sight.

Jill sat down at her same table, and expected her shirt to strain over her large stomach. But as far as she could tell (she had to pat with her hands – she couldn’t see her stomach beneath her growing boobs), her stomach was as flat as ever. She hadn’t put on any weight! Why then were her jeans so tight?

Jill leaned to the left and looked down to her right, and suddenly realised how raised in her chair she was. Her butt was many inches bigger already, and her thighs were squishing up to the bottom of the table. Jill was vaguely aware she was getting her wish in a certain way, but she’d wanted to be bigger all over! Still, this was a start.

She realised more food was the answer – she was starting to think it was the answer to everything, she was so hungry – and she started ploughing into the next tray full of food.

Stuffing fries into her mouth, she felt her jeans constrict further, and knew she was going to have to get out of them soon. They were so tight, she was worried about cutting off blood flow. How had she gotten to large already? Her butt and thighs were bulging out of the jeans, and she wasn’t sure if the seams weren’t starting to come apart. How big was she?

She pushed the tray away from her as her breasts grew bigger and bigger, so that she could see everything that was on it. The pile of fries was diminishing quickly as she shoved them in her mouth, dripping with fat, salt and sauce. She was starting to get grease around her mouth, and she didn’t care one bit. Everything brought her closer to her goal. Jill hadn’t even noticed that the top buttons on her shirt were hanging on by a thread, each massive mouthful swelling her breasts up to the point where they were going to burst out.

Jill felt a distant snap, which was her bra self-destructing, and took a huge swig of her second massive coke. She could feel the sugar coursing through her veins, and experienced that chemical-McDonald’s rush that she knew so well. Except this time it was accompanied by a stretching of skin and an expanding of her figure that she was only half aware of.

Jill was dominated more and more by an all-encompassing hunger, and it was proving quite difficult to satiate. Jill did her best though, stuffing more and more junk into her mouth, be it apple pie, McFlurry, burger or fry, all washed down with gallons of ice-cold coke. She was blowing up larger and larger, and her chair was really starting to struggle. Her breasts were engorging to epic proportions.

And without warning, a few things happened at once. Jill’s chair, which had been badly made from the start, began to come apart. She was just too heavy for it. Her jeans, which looked like they’d been painted to her body, began to burst a little at her enormous butt and thighs, which were just pouring out of them.

And the top two buttons on her shirt flew off, firing out into the restaurant.

All these things brought Jill a little back to herself. She was aware she was in a public space and was becoming far too big for the clothes she had on. Her tits were now the size of large melons, and she could see for the first time how huge her cleavage was, now her shirt had burst open at the top. Two massive pink mounds of swollen boob were rising up to her chin as her breasts expanded bigger and bigger. Occasionally, a crumb of burger bun or blob of sauce would drip down and slide between those gargantuan knockers, lost for ever.

They slowly bulged together, two massive expanses of flesh, and her cleavage line became tighter and tighter as the swollen baps grew bigger with each mouthful of junk she ingested.

Jill was almost done with her second meal, but had a whole other one to go. Where was it? She belched and looked down, only to feel a poke in the base of her phenomenal right tit. It was the straw of her third huge drink. She patted beneath the swelling balloons that made up her chest, and located the third tray. How had she not seen it? These breasts were going to be a real obstruction. She liked that! That meant she was really putting on weight, even if the areas were quite…specific. It would do.

Jill picked up the third tray, and made her way to the door. Walking was really tough. Her jeans were coming apart at the seams, and her massive fat thighs and butt cheeks rubbed together as she walked, her tits bulging and swaying in front of her. She estimated she was actually quite a large girl now. But that hunger was still there, gnawing away at her.

Oblivious to the stares that accompanied this pumped-up goddess as she strode across the McDonald’s, grabbing chips to feed the fire that roared in her flat, slim belly, she took her phenomenal melons, huge butt and bulged out to the car.

There was some pain in her ass, and Jill realised her car keys were in her back pocket, completely trapped by her fat ass, which was expanding as she absent-mindedly chewed on more fries, growing bigger and bigger as she masticated.

Jill placed the tray on the roof of the car, and slowly slid her hand into her back pocket. The opening was about the width of a single piece of paper, and she found progress agonisingly slow. While she fiddled, her breasts were growing bigger and bigger, an extra couple of buttons popping open as they slowly heaved to the size of small watermelons on her slim frame. She was becoming aware of how heavy they were, sat on her chest, just about held in by her impossibly struggling shirt.

Eventually she ripped the keys from her pocket, where they flew onto the floor. Jill bent over to pick them up, and her jeans ripped open, right over her massive, fat ass. The tear came right down the middle, and her underwear was revealed, riding right up between her huge cheeks. At the same time, her huge tits swung against her knees, fat and firm on her chest. Being big was hard!

She grabbed the keys, and opened up the car, sitting the in the driver’s seat, grabbing the tray of McDonald’s (she hadn’t forgotten about that, even in her vague, confused state) and putting it on the passenger’s seat.

She crammed a fistful of fries into her mouth. And started the car.

Her lights flicked on, illuminating the parking lot in front of her.

She had a tank full of gas and a car full of food.

Jill’s stomach rumbled.

It was really time to put on some weight.

End of Part I…

Part II coming soon…

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