The bottle instructed her to eat something with the pill, which is pretty standard. She had already eaten a half hour ago, so she figured she was good for that requirement. She popped the pill, and waited for the growth.
And waited.
And waited.
An hour passed, and nothing happened. "I guess this was just a joke. I can't believe I just swallowed a pill given to me by a stranger. I must be nuts." Tifa was beginning to get hungry again, so she went into the kitche to fix herself a sandwich. She gobbled down the sandwich, almost TOO voraciously, and hiccupped. She could feel her shirt get a little tighter. She looked down at her body, and saw that a tiny roll of fat had developed around her shorts! So it does work! She just needs to eat food! She makes herself another sandwich and gulps it down. She waits for it again, and once more, she hiccups and her belly grows further, now making her look like she's gained a total of twenty pounds. Her breasts were now noticably larger and rounder, dropping further down than before. And her ass, it had begun to peek out from her shorts.
Tifa was now having fun. She made a stack of sandwiches, about ten in total, and began to eat one at a time. Each time, she'd hiccup, and watch her belly grow. After the fourth sandwich, it had looked like she must have gained sixty pounds. Her shorts had burst, unable to contain her massive belly, and her shirt had begun riding up her massive tits, which themselves obscured her view of her ever-growing belly. Tifa could also feel her ass get fatter and rounder, giving her a major wedgie.
Tifa figured it'd probably be a bad idea to get completely strangled by her tight clothes, so she peeled off her shorts and her underwear, kicked off her shoes (which had burst at the seams for some reason, even though her fet didn't look much plumper), and ended up having to tear off her shirt, since it wouldn't go over her now humungous tits.
Now Tifa was entirely naked, her breasts fell free and draped over her belly, and she could finally breathe again. She grabbed another sandwich and continued to eat. As she reached for the sandwich, she noticed it looked smaller... supposing that her stomach is truly bigger than her eyes, so to speak. She ate another, and another, and with each one, she'd hiccup and grow more and more obese. Once she finished off her seventh sandwich, she hiccupped and noticed two things:
1) First, she had fattened up to what must have been over 210 pounds! Her fat belly fell over her thighs and covered her privates, and her tits fell down almost toward where her belly button WOULD be, if it weren't attached to a fat belly that extended almost past her reach. But maintaining her traditional hourglass figure, her ass matched in size to her breasts, if it wasn't bigger, and spread across her wide, sexy hips.
2) Second, she had hit her head on the ceiling. Now, Tifa thought this was a bit odd, because they had raised ceilings in this house. In fact, when they last measured, the ceilings were eleven feet tall. Yet here she was with her head touching the ceiling. Tifa looked around her, and it began to make sense. Everything looked tiny to her. The eighth sandwich fit into the palm of her hand. Her old bra now wouldn't even cover a nipple. Her ass was bigger than even the couch. She was MASSIVE!
Tifa couldn't believe this. Was this what he meant when he said, "all growth functions?" Tifa stumbled around in a stupor, causing a huge crash whenever she'd take a step. She made her way to the bathroom, and upon the sight of the tiny door, attempted to squeeze in. It took a little work, but she was able to fit through the door (taking out the molding with her), and found the scale.
Now, the scale they had was not a wwbalance scale, but a pressure scale. It didn't technically have a limit, but it looked like Tifa was going to test that out. Tifa stood up, once again hitting her head on the 11' ceiling, and moved one fat leg over to stand on the scale. When she planted it on the scale, the digital readout started scrambling, trying to figure out her weight. She swung another fat thigh around to the scale, but she could only fit one foot on it, so she just attempted to balance herself on one foot on the scale, in order to get an accurate reading.
The scale's display continued to scramble, until she found her balance, and it settled down.
HEIGHT: 11'2"
WEIGHT: 908 POUNDS
BMI: 35.5
How could she weigh so much? She only looked like she was 215! However, Tifa figured, at her old height of 5'4", if she were 215 pounds, she'd still have a BMI of 35.5. So it made sense... kinda.
Tifa didn't know what to do. She was nearly half a ton and too tall for her house. This was probably the worst thing that could happen...
...yet strangely, she still had this urge to continue to eat... get fatter... get taller... where was this urge coming from? She knew better than that... that was a terrible idea. But even yet, she had the urge to eat anything in sight and get bigger!