Numbuh 4 headed Numbuh 1’s warning, even though he’d like nothing more than to be at Kuki’s side. However, just as he had said, Numbuh 3’s body was bloating up right before their very eyes. Ironically, Kuki’s breathing started to grow less heavy as her body got heavier.

It started with her belly, as it swelled up like someone was filling it with air, but from the way it jiggled, it was clear that it was pure fat. The huge paunch appeared to be a perfect sphere as it was packed into Kuki’s now tight sweater. That however was something everyone expected to see based on Numbuh 1’s warning, what they could never have imagined was two more spheres appearing on top of the belly.

Even Numbuh 3 gasped at the sight of what was growing out of her chest. She returned to moaning unfortunately as the bloating only got worse. Two more balls of pure fat now strained her sweater, and threatened to pop out at the neck line if they got big enough.

Numbuh 3 gasped once more as she watched her arms fill with fat before her very eyes. Her once too long sleeves were now rolling back as there soon became too much to cover. Kuki could now see her hands, and they were just as fatty as her limbs, with her fingers now looking like pale sausages.

She then brought her plumped hands to feel her plumped face. Her cheeks were filling in her palms, swelling with fat just like her belly and chest. Thankfully, they didn’t get that big, but Numbuh 3’s face definitely looked much rounder now.

“This ain’t good.” Numbuh 4 said. He was stating the obvious, but as someone who had taken the serum to, he felt he had the right to speak. No one said anything to him though, too busy starting at Numbuh 3, but that didn’t stop him from worrying about becoming a butterball like her. So far, nothing had happened to him, but Wally didn’t feel like he was out of the woods yet.

She tried to stand up, but wobbled as her legs started jiggling. Before, Numbuh 3’s legs had looked like twigs, but now as they filled out her pants, they looked more like black trunks. Of course, everyone stopped staring at Kuki’s legs before she even shouted “AH! MY BUTT!”

Just as she said, Numbuh 3’s rear end wasn’t spared and was getting fatter and fatter with each passing second. Her cheeks formed into huge mounds of blubber, stretching her pants wide enough to nearly split them. The worst part for Kuki though was that she was soon getting the mother of all wedgies as her now too small rainbow monkey undies rode up her crack. By the time it was over, only her belly outweighed her butt.

No one knew what to say, and no one knew what Kuki would say. The only thing they thought about what changing her codename to the number of however much the chubby girl weighed now.