Sarah smiled serenely. She was having a wonderful day. All of her rivals were sufficiently cowed by her popularity to stay far the hell away from her, and there wasn't a guy who didn't want her- well, except for that creep Jon.
And really, the guy's best friend was Karyn! 'If he likes little girls, he's just a creep, and I don't need him.'
With that thought in mind, Sarah headed to her next class. It was hard to pay attention- the teacher was so boring! Besides, she had a boy taking notes for her, so it's not like she needed to pay attention.
As the class went on, however, she felt a tightness in her chest. 'Fuck, I must have put on one of my old bras by accident.'
Just a year ago, Sarah's breasts had been a modest B-cup, but they had been growing steadily. It only helped to keep male attention on her, but she went through bras pretty quickly. She wasn't quite a D-cup yet, but her mother had fairly large breasts, so it was likely inevitable.
The teacher called on the student in front of her, which brought Sarah's attention back to reality. To her surprise, the girl in question, Claire, seemed taller than she remembered- Sarah had a hard time seeing past her!
'Ok, that's just weird.'
When class ended, Sarah stood up, and everyone seemed a lot taller than before! What the hell was going on?
Quickly, she made her way to the girl's bathroom. Her formerly-tight jeans were riding low on her hips, and she had to hold them up to prevent them from falling down and exposing her behind!
To her shock, everyone seemed to be getting taller, and her bra was starting to hurt! And yet, no one seemed to notice anything was wrong!
Inside the bathroom, she locked the door and rushed to the mirror. One of her shoes slipped off her foot as she moved, but she didn't bother to stop.
The mirror was higher up than before, but she could still see herself in it. Her features seemed softer...younger! "No...this isn't possible!"
And yet, she couldn't deny it. The girl in the mirror looked all of 13! She slipped out of her oversized shirt to find out why her breasts felt so pinched, and she found that despite the fact she had shrunk, her breasts hadn't. In fact, they had gotten larger!
Removing her bra, she put her hands on her chest. They had to be DD's for sure! "What...what's happening to me?!" She wailed.
Looking in the mirror, she realized she'd gotten even smaller. Now she had to stand on tip-toe to get a good look at her face. A light dusting of freckles had appeared on the bridge of her nose, and she looked more like 12 than 13!
Her pants slid right off her thighs, revealing slender, coltish legs. Pulling down her panties, she saw that her pubic hair had receded, and even now, it was vanishing before her eyes, becoming a soft downy fuzz!
Her knees felt weak, and she slid to the floor, her eyes stinging with tears. Other than her now-mammoth breasts, she looked like a kid!