Sherry was walking along home with her newest toy that she wanted to test out. The device in question was something called PHAT, which stood for Physical Hypno-Atrophic Transformer. The device had 2 parts: a tablet for inputting a change, and a headset with built-in headphones. In the most basic description, the user sets a transformation on the tablet's interface, which would set up an audio-visual hypnotherapy within the headset of the device. The user would, in turn, wear the headset, which would get to work administering the desired change to the user. Once used, it would take a little time for the change to occur, usually happening overnight, and allowing the user to have a painless, fast transformation. And Sherry had just gotten a steal on the latest model.
Once she returned home, she decided to begin immediatey. Her immediate problem was her breasts. On almost every level, she was a total sex idol. She had the sexy, alluring face and voice combo, and big, curly hair. She had toned arms and a flat stomach, thick thighs, a thin waist, and an ungodly massive, but still supple ass. The only thing that wasn't absoultuely perfect were her breasts. She wasn't even an A cup, she was just completely flat-chested. Not even muscle definition, just completely smooth. She was longing for at least some sort of breasts, even if they were just a C cup, maybe more. Maybe much more. With this device, she could look however she wanted.
She was remarked to find that setup was remarkably simple. Just some sliders on her desired features. Locating "Breast Size", she started slowly upping the bar. She went from the A setting to the C setting. Then to the F cups. Finally settling on an absurdly large K cups. Maybe larger, depending on how she felt afterwards. She finished up the selection, and sent the file off to her headset. The tablet really that it would be a 10 minute session of her and the hypnotic setup. Considering it was taking her from completely flat to K cups overnight, that wasn't bad.
Slightly tense from what might happen, she placed the headset on. The headphones covered her ears, and the lenses laid completely black for a moment. She pushed a button on the tablet, and the whole system came to life. On the lenses, a series of black and white spirals began swirling in her eyes. Random buzzing sounds came from the headset, making her brain feel fuzzy. She felt a slight warmth in her chest after about a minute of the session, but no growth. She had to sit and relax for 10 minutes, letting her mind go numb and accept the transformation.
Ten minutes of ear-piercing buzzes and swirling spirals, she was done. She lifted off the headset and examined her chest. It felt hot. Fire-heat. But, no growth. Still flat as ever. The ads did say she would have to wait, so she decided sleep was the best way to pass the time. A little nap, and she would be busty.
As she slept, the fire in her chest became hotter. Moments after she fell asleep, her chest began to expand into actual breasts, growing faster with every second. Like water balloons, they blew up into perfect teardrops, filling out as they got bigger and bigger.
An hour or two later, Shelly woke from her nap, the fire gone from her chest, replaced by two massive K cup breasts. She nearly passed out from shock. As she began to stand up, she noticed how heavy they were, almost uncomfortably so. She could see how some people would complain about back issues. But for her, a bad back was worth it for minally completing her sexy figure. She examined her large, sensitive breasts, admiring their shape and jigglyness. She loved them, right now, at the size they were at. She was content. But curiosity got the better if her. She had to try something else.