Turns out that popping that button was only the beginning of Weiss's weight gain. She couldn't lay off the food no matter how she tried. Every attempt at such only led to her rebounding and eating more to catch up, all in a vicious cycle that made her eat more and more. Needless to say, this only ended with her weight escalating, making her the fattest student at Beacon and ruining her fitness to the point where she only scraped through Beacon graduation on the back of amazing test grades. After that, with the shame and humiliation that came from her complete lack of control, she retreated to one of the Schnee family's holiday homes, claiming it as a refuge for herself.
There, she spent all of her time, eating until her stomach was too sore and full to eat more, then resting until she could eat again. This wasn't just a lack of control now, she was fully out of control now, with nothing on her mind but food, and it had the expected effect.
Weiss widened dramatically, filling out a queen-sized bed all on her own, with hips carrying excessive saddle bags of fat and a cellulite-ridden ass like a pair of feathery soft couch cushions while being supported rolling thighs that were bigger than she was back when she popped her first button. Her belly extended out well past her reach and spent most of its time resting on her expansive lap or her bed's mattress, and on the rare occasion that she was out of bed it flowed all the way down to rest and drag along the floor as she waddled about, with little perkiness or roundness to it. Her breasts were equally lacking in perkiness, hiding the fact that each of them were about the size of watermelons as they lay atop her belly. Her barely useful arms carried enormous bingo wings that jiggled like jelly as her sausage fingers shovelled food into her hungry mouth. Her neck was swallowed up by the cascading fat chins rolling down it, which were emphasised by her beyond pudgy cheeks.
In all, Weiss was an immense woman, as to be expected from a woman waited on by an army of servants and who stayed in bed, eating at every waking moment. And why would she do anything else? This was what she was good at, this was what she enjoyed. She wouldn't have gotten so massive if that wasn't the case, she realised. After that revelation, all that time she wasted trying to cut back, holding herself back, she was going to make up for that, and then some. She was going the live the life she was meant for with no regrets. It was just a shame that not enough people appreciated it quite as she did.
[AN: Got the prompt 'Future Fat' from my little prompt wheel, and it just fit as a follow-up to 'Schnee's Losing Control' too well. Originally, this was gonna have a darker ending, cause I wanted to try something different (like with writing Weiss at such an extreme size), but I didn't really dig it all that much.]