Mara Janes starts fattening, quickly overflowing her dress

Kayla saw it start, since she was watching for it. She saw Mara Jane start to plump up. It was her arms first, unrestricted by the dress in any form, they swelled with fat in pulses, quickly becoming proper bingo wings. Her forearms followed, quickly thickening, making a small dimple form at her elbow.

"Was this right? She seemed aware of what happened..." Kayla thought

Kayla noticed her breasts growing next, pulsing larger and larger, the modest Bs quickly bloating through letters, pushing around the built in cups of the dress. Supple flesh spilled over the top of the low neckline, bordering on indecent, but despite tears it covered the important bits, though Kayla shivered slightly as she saw wet spots formed over what she could only assume were her growing nipples.

"Mara Jane was always so proud of her body, and now I've... but she stole Simon from me..." Kayla ruminated as she kept watching, almost in slow motion. Though, gasps told her that others were noticing.

Kayla's eyes drifted lower, to Mara's belly. It pushed out in waves with each pulse of growth. Two fleshy rolls quickly ripped the sides of the dress, pale freckled skin surging out, lifting her dress up and it fought for space.

"I never made a move, not for years leading up to telling her. Did I say I had a crush? I don't even remember. Had I just thought about telling her?" Kayla brought a hand to her chin. Her stomach turned. She had fucked up.

Kayla looked further down as confusion started erupting around her. Mara Jane's hips widened, her thighs thickened, and from Kayla's height she could see Mara's ass swelling. The beautiful custom made dress continued tearing more and more as her legs grew, making her shuffle her feet apart as her thighs pressed together, the bottom of the dress rising rapidly as her ass swelled out, the massive cheeks spilling from the bottom as they stopped growing.

"What have I done?" Kayla said aloud to herself. She had just watched her friend balloon into a probably three hundred pound cow, milk and all, and just an hour ago she would've been delighted. She would've tried to flirt with Simon. She looked at Simon, she couldn't tell his emotional state, he was trying to get Mara Jane to stop eating from the buffet, though he was trying to not touch her. Kayla thought that was odd. All these thoughts collided at once, paralyzing Kayla for a moment with indecision.