After Grace confirmed the changes, time seemed for her to stop. New memories were filling her mind while the world around was changing.
One year ago, Grace joined the gym for the first time. She adored muscular women for a long time and wanted to become at least partially as good looking as them some day. But miraculously, she didn't wait long. Contrary to the "original timeline" (as she started calling the world before any changes), she gained muscle and strength easily. In a two months or so, she became 200 pounds, 6 ft tall bodybuilder babe, and that was just the beginning.
Puzzled by the impressive outcome, she soon discovered that it was probably boosted by her favorite energy drink, due to its experimental status. And her assumptions proved to be true, when it got withdrawn from the market with health organizations warning about its potentially harmful effects. But because Grace experienced only beneficial effects of that drink, she didn't stop using it. She stocked up as much of it as she possibly could and returned to the gym, eager to grow much bigger.
4 months passed and Grace's extraordinary growth slowed down. Well, that wasn't so bad - she was already 7 ft tall, 400 lbs of granite-tough muscles powerhouse, bigger and stronger than any being, but for the last month she didn't grow an inch. Did she reach the limit? She often got headaches, caused by mutagen drink abuse. But after a few days, the headaches stopped and Grace uncovered additional drink's effects - she was much, much more intelligent than before. In fact she was a genius! She could remember anything, from the most scientific things she read on the Internet, to contents of bulletin boards caught with the corner of her eye. Her vision seemed much clearer, and her thoughts were processed immediately.
While not hitting the weights in the gym, Grace spent lots of time in a local university's library. In no time she gained an knowledge of a Doctor of Science, Medicine etc. and then even more. She conducted her own private research on the forbidden energy drink, and found what was the most important mutating factor in it. Then she created her own, countless times more potent potion. And boosted with that, she continued her growth routine.
But this time, even more side effects appeared. Grace's body, though inhumanly giant and ripped beyond any imagination, gained more and more feminine shape. Her waist narrowed down, her butt plumped out. Boobs returned on the flat surface of her firm pecs, gaining breast tissue rapidly, growing beyond any bra's capacity.
Two months before present day, Grace was lazying around. After serious workout, she just got out of shower and laid on her bed, naked, going through her comic books. She was godlike - 7'6" tall, weighing 2 tons of titanic muscles and feminine body with outrageous curves (her boobs were at least three times bigger than her head), she could lift fifty times her mass and was the most intelligent person in the world. She was popular, but it peaked some time ago and was now stabilizing in form of devoted fandom. Lately she was getting bored with lifting with ease more and more, because now big trucks were no match for her strength. She asked herself "Am I bored of my superpower?"
And that last word ringed a bell in her head. She looked at her comics and immediately knew what to do. With her intelligence she'll build the superpower giving machine! Unfortunately, even though the inhumanly complex project took her less than a day to create, the parts to that were so rare and unique, she had to wait for deliveries a long time.
But the wait was worth it. Exactly one week before now, she completed the machine. It looked quite like lamp, but with ray on its top, and after choosing a superpower from the computer's menu it was supposed to shoot the target with its ray, mutating them with chosen power. For the testing, she chose most typical one - flight. The beam hit her, making her body hot and itchy for a while, and then it stopped.
And just like that, Grace gained her first superpower. It was amazing - even though she was too big to be carried in public transport or cars, she could fly with the speed of the sound.
And at that point, the flashbacks stopped. Grace looked at her body - it was real! All the changes really happened! She couldn't contain her joy.
After long hours of testing her new (though in fact gained during last year) strength and flying around a house, she stopped in front of her miraculous machine. She couldn't wait to use it and power up again. But maybe she should invite her friends and make them into superheroes too?