"I don't have time for this! Where the hell could they have gone?"
After searching around, Jen managed to find everything she had been looking for except her still missing pair of underwear.
"Screw it then, I guess I'll just have to settle for these..."
Compromising as she had little time left to prepare now, she grabbed an old pair that didn't match the rest of her outfit, hastily slipped them on, and bolted out her bedroom door, making her way out of the house to catch the bus.
As she reached for the front door's knob however, an intense wave of vertigo spontaneously hit her all at once, leaving her in a daze.
She attempted to reach the couch nearby to sit down and rest, but her legs suddenly felt like they were made of jelly, and so she simply fell over limply and rested on the rug by the door instead. What was slightly odd at first became concerning, as she felt her whole body begin to noticeably warm up.
"Whh.... Whas... happeningg....? Wh-... Mmmmnnnn....???"
Trying to vocalize any of her thoughts, Jen was suddenly brought to silence, incapable of vocalizing at all anymore as her body began to change, leaving her trapped in the heat of the moment, unable to focus at all with her thoughts feeling like a hot soup being stirred around.
The first noticeable change was the shrinking, which was progressing quite fast. Within the first minute, she was already less than 3 feet tall. Her height wasn't the only thing shrinking either, as she began to appear more flat, compressing down more and more until she appeared as though she had been crushed in a cartoon. This compression left her mind in even more of a warm haze than before, as though her very thoughts were being smushed down into each other. With such drastic changes to the shape of her body, all of the clothes she worked so hard to gather and put on earlier began to slip and fall off of her, leaving her a small flattened caricature of her former self in a pile of her clothes.
Just as it seemed the changes were over, her shape began to shift once more, as she shrunk even further than before. Her entire form was being compressed down into a thin sheet, which was then forming itself into the shape of lightweight panties. Lost in the heat of it all, Jen couldn't even acknowledge any of the changes being made to her body. Not consciously anyway. Her expression, being one of dazed bliss, was plastered over the back of the underwear she was becoming, as the rest of her formed the elastic loops that would serve to fit her new body snugly over the wearer's legs and waist.
After just a few minutes, she was left as a pair of panties, buried under the panties she was wearing herself not even 5 minutes ago.