Jill had been driving for a few minutes, and her breasts were bigger than ever. Her two massive airbags swelled out in front of her, still slowly growing and shuddering as they expanded larger and larger.

Her third tray of McDonald’s sat on the passenger seat next to her, and her hand constantly scrabbled for more food, feeding the furnace that roared within her, a product of the experimental serum she’d injected in order to gain weight.

And she was gaining weight – that was for sure – but it was confined to two very specific areas.

Jill’s car was a stickshift, and every time she changed gear, her arm became more and more impeded by the swelling mass of breast that was slowly bulging out from her chest. The more she ate, the bigger her boobs grew, and they were already colossal. Her bra had buckled and burst open long ago, and the white work shirt that used to be a little too big for her slender barely even classified as “on her” now.

Jill’s breasts were now the size of large, ripe watermelons. They rode huge and high on her chest, and each boob was a little larger than the size of her head. As a result, these massive twins were pressed tightly into one another by the shirt they were under, creating an enormous, all-encompassing canyon of cleavage that had already claimed a lot of food residue that hadn’t quite made it into Jill’s mouth.

This enormous expanse of breast was now so wide that Jill’s breasts were almost moving beyond the width of the seat she was on. The car shot along as she powered down the empty highways, her tits shaking and bouncing with every jolt the car took. With one hand on the wheel, Jill shoved more and more food into her greedy mouth, barely taking time to chew. She was so hungry, and so desperate to finally put on some weight. The serum was doing something funny to her mind, and Jill wasn’t quite able to fathom how huge she was. She knew what she was doing was right, though. And she knew she wanted more of it.

As her breasts grew larger and larger, Jill’s shirt started to pop open even more. To the casual observer, Jill was basically naked, but if you looked at the base of her tremendous tits, you could see a couple of tiny-looking buttons just about holding things together underneath and to the side of the massive curve of her bust.

But even Jill’s food-crazed mind could tell she was going to run out of room in her top soon, and would be naked. And that might make her cold. And being cold would burn calories – calories she desperately needed.

With indicators clicking, she pulled into a roadside mall, and stocked up on clothes.

Jill took the tray of McDonald’s with her, stuffing her face with burger while she walked, her tits swaying and jiggling massively, causing any late-night shoppers to stop and stare open-mouthed, as this enormous-breasted goddess bounced past them. Jill took no notice; she barely registered other people’s presence. She was so hungry.

She bulged into a couple of Plus-size clothes stores and picked up some jumpers to make sure she stayed warm. She got three of the largest size they stocked, which had quite a few ‘X’s on the label, and paid at the counter, still slowly bulging forward in the breast department as her tits continued to expand ever-larger, her nipples barely covered by the struggling fabric. Her shirt wasn’t going to last much longer; it was never designed for this.

“Um, I got you these.” Jill turned and found herself breast-to-face with a frightened looking store clerk, who was holding some black leggings. “You look like you could do with them.”

Jill had forgotten, but her jeans had split ages ago when her massive fat ass had burst them open. Now her enormous butt was very visible as it swelled larger and larger, her huge wobbly cheeks tearing her jeans to pieces more and more. Jill paid for everything, feeling her thighs press together as she stood there, the heaviness and scale of her ass growing greater with every mouthful she ate.

Jill shoved an entire apple pie into her mouth, grabbed the huge coke from the tray, belched hugely and burst her shirt open, revealing her humongous chest to the entire store. Embarrassed and shocked store personnel ushered her to the changing room, where they took her white shirt and squeezed one of her enormous jumpers over her tremendous boobs. It was a tight fit, but luckily the fabric was very stretchy.

None of them knew what to make of this incredibly busty women who appeared to be drunk, or confused, but they removed her destroyed jeans, and got her to step into the huge leggings, which just about clung to her phenomenal thighs and gargantuan ass. Jill continued to sip on the huge coke, and wobbled and grew larger all the while. Each of her breasts was approaching twice the size of her head, and her ass looked like she was smuggling basketballs, but eventually she was dressed, and squeezed herself out of the small changing room, rubbing her huge tits across the face of the baffled staff member as she left.

Back in the car, Jill had finally finished her enormous vat of coke, and was getting hungry. Her car felt suddenly much smaller. With her huge new ass, Jill’s head was quite close to the roof, and her tits expanded out in front of her like medicine balls, suddenly enormously huge in her tight-fitting sweater. With a great effort, Jill hauled her huge, heavy form out of the car, and thigh-rubbed her way around to the trunk, where she grabbed three bags of fatty shopping she’d picked up before injecting herself with the serum.

Leaning down to get the bags made her topple forwards into the trunk, the sheer weight of her disgustingly big tits catching her off guard. While she was down there, she adjusted herself onto her back, feeling the enormous weight of her tits on her chest, and located a big pack of doughnuts.

Jill opened up the box and started stuffing her face, desperately trying to cram as much sugar and fat into her system as possible before the serum’s effects ran out. Jill started to wonder, as she filled her mouth with dough and sugar, what would happen to her body when the serum’s effects expired – she hoped she’d keep some of fruits of her labours, with regards to the weight she’d put on; she could feel the car starting to creak with supporting her massive bulk, and took it as a point of pride. No one could describe her as thin, even if her stomach was as flat as a pancake.

All those thoughts of pancakes brought her focus back on food. Jill was lying on her back, two enormous fat zeppelins perched atop her chest, bulging larger with every moment as she stuffed her face with doughnuts from the box, one after the other. She was barely chewing.

Her tits expanded larger and larger, two swelling, over-stuffed balloons, pulling hard against the tight fabric of her peach jumper. Cleavage was starting to become visible, against the sweater’s best efforts, as her tits pulled the material further and further away from her slender body. All the while, it was like her body was on a jack, as her ass pumped up bigger and bigger.

She was lying on the lip of the trunk, and with every doughnut she forced down her throat, her butt seemed to grow an inch, and she was tipped more and more backwards into the trunk, her fabulous breasts weighing down more and more on her. It occurred to Jill that if she wasn’t careful, she’d collapse in the trunk of her car and never get out, and whilst that wasn’t the worst eventuality (she was surrounded by junk food, after all), she had to think long term. What when that food ran out?

Such perilous thoughts snapping through her brain, Jill hauled her massive form to her feet, her swelling breasts inching out bigger and bigger with every mouthful she ate, and tottered to a standing position. Her breasts were impossibly big now, at least ten inches in front of her, like beachballs on her chest. She loved how big they were, and she could feel her ass rubbing against the car, and knew it was also phenomenally huge.

Jill grabbed assorted bags of food, and bulged back into the car. It was a real squeeze to get through the door, her ass and breasts were so huge now. As the sat down on the seat, the front of the car dipped dangerously, and Jill was aware of how heavy she’d become. She smiled.

Jill slung the shopping bags on the passenger seat, and opened a huge bag of chips and bottle of coke, and started consuming. Coke dribbled down her chin and stained her fabulous cleavage and peach jumper. She was getting sloppy now, but she was just so hungry, and wanted to be so large.

Belching hugely, Jill started the car, her breasts jutting out twelve inches in front of her. Her arms had to bend around her colossal boobs, which were getting close to pressing against the wheel. She watched them expand for a second, her head rubbing against the low roof as her ass grew so huge, she could barely fit inside. She started the car.

Jill tore off down the highway, until she made it out to the country. Her breasts were starting to obstruct the steering wheel, growing so huge they were like two massive airbags in front of her. As she continued to eat, she tilted her head on its side in order to fit inside the seat, as she blew up bigger and bigger. All this expansion was making her very, very turned on.

As she neared her house, sparks started to fly out the front of the car. Jill parked up by her place, knowing her weight had dipped the front suspension so much that she couldn’t drive any more. She sat there, breathing deeply, her stupendous boobs bulging against the steering wheel. She picked up the half full bottle of coke, and drained the entire thing, belching and shaking.

Heaving her gargantuan form out of the car, Jill wobbled her enormous thighs and butt to the trunk of the car, picking up the extra bags of junk food, careful not to fall inside this time. Walking was tough – her legs weren’t designed to support this weight, and she could feel her entire body complaining against her tremendous size.

It was when Jill couldn’t get through her front door, that she knew she was really achieving her objective. Her breasts, now at least three times the size of her head each, wedged firmly in the slender doorway, bulging up either side as they continued to grow. Her butt was about the same width, and she had to really push to get herself through. She held her shopping bags under her bust (they couldn’t fit at the side), and immediately forgot she was holding them as they disappeared from view beneath her impossibly engorged boobs.

Inside her house, Jill flopped down on a chair, forgetting how heavy she’d become. It broke instantly beneath her massive weight. Sprawling on the floor, huge ass bulging in her now incredibly tight leggings, phenomenal boobs towering into the sky, Jill felt like nothing more than an inflatable, so big, round and firm. But it wasn’t air inside her; it was pure mass.

Jill rolled from her huge ass onto her front, and slowly pushed herself up to standing, her preposterous udders swinging down beneath her, still growing larger and larger, her stretched jumper starting to give up the ghost. She toddled across her front room, and gently lowered herself onto the sofa, where she lay on her back, her massive ass thrusting her legs up at an angle.

And there, still shoving food into her mouth, Jill slowly fell asleep, as her sweater began to pull apart at the seams.

She dreamt of huge things. After all, she had a house full of food, and even if she woke up late, a good 12 hours of serum to exploit.

She was never going to be thin again.

Jill could be sure of that.

—

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