She grabs another cake from the shelve and begins to tear into it, no longer using utensils, but just her fat fingers.
They tear into the magically thick frosting, which in turn is making her magically thicker all over. When she first entered and indulged in the cake, one would call her chubby, but now the only word that comes to mind is obese, massively so.
"Ungh...this...is...so...good" she says, smacking her lips, crumbs flying off her lips. Chocolate is smeared all over her face, melted like a sign of victory on behalf of Mr. TF and his sweet shop. She had not wanted to try it for fear of gaining weight, and yet here she was, Six Hundred Pounds heavier, and she was loving every second...
She plops down on her huge ass, and continues to eat the cake, which is just making her fatter and fatter. Her thighs were squished against each other, but she couldn't see that, as her paunch of a belly was far to big to allow that. She couldn't even see her toes, which were now filled with fat, and looked nothing like her feet used to. Her flip flops were the last remaining piece of clothing, and while they hadn't burst yet, they were about two sizes two small now, as her feet had grown slightly due to the fat gained in them.
Her breasts had increased ten fold since the gain began, but had lost their supple shape, and were now blobs of flab, like the rest of her.
Soon the cake is finished, and her hunger is finally defeated, but now she weighs 700 Pounds. She looks around for something to wash the cake down and sees some liquids sitting in bottles in a cooler...