Mary spun through the vials, looking for something that would quickly prove to Joe that the magic was real. She didn't want to scare him though, so maybe not another animal vial this time. While most of the labels just had a image on them to hint at what they'd do, there was a section with some writing and Up and Down arrows: Age, Weight, Size...
"Here! I'll take some of this 'size down' vial to show you the box's power!" Mary pulled out the vial and uncorked it, pointing to the 'undo' vial before she took a swig. "That one changes you back, like a magical 'undo' or 'revert' potion. That's what I took after I'd let you inside to get back to looking like myself." She didn't yet want to tell him that she'd been half-pig beneath her robe and mask. Before she could chicken-out, she took a large gulp of the shrinking potion... maybe more than she'd intended. There was only a tiny bit of liquid left in the vial when she replaced it in the box.
Joe was looking around Mary's room as she put the vial of what looked like water (or maybe vodka?) back in the case on her dresser. A fluffy robe, towel and bunny slippers were discarded on the floor between her bed and closet, but that didn't prove that someone else hadn't been wearing them earlier.
"Whoa," Mary said, raising a hand to her head. "That one was a bit strong. Maybe I should sit down for this." she backed towards the bed before plopping ungracefully down on the end.
Joe picked up the vial she'd just drank from, uncorking it and giving it a sniff. Despite Mary's immediate reaction, he couldn't catch a whiff of alcohol, or any smell really, from the liquid. He replaced the cork and traded it for the 'undo' vial, leaning back against the doorframe to watch these supposed changes Mary swore would happen. She seemed the same size to him, with her toes grazing the carpet and her hands propping herself up from behind. Her head was down though, and she'd closed her eyes, and as Joe watched, her whole body gave a visible *shudder.*
"I don't know, Mary. You look the same to me. You said you'd just received these in the mail?" Joe glanced back at the rather-ornate wooden box, amazed at how many vials of liquid the thing held. "How do you know it isn't just some water, or worse, something toxic? You're just drinking these things willy-nilly?"
Mary shifted on the blanket, beginning to feel a building pressure all over her body, as if she was under a weighted blanket or being squeezed from every direction. She wiggled her legs to shake off some of the feeling, suddenly realizing that her feet no longer reached the floor. "It's happening! Joe! Look! I'm getting smaller! Can you see?!" Mary kicked her legs, making sure Joe would notice how much shorter they were.
Joe looked back at the bed, instantly shocked by what he saw. "What the... how... how is this possible?!" The woman on the bed WAS noticeably smaller - her proportions seemed to have remained the same, but her feet were now half-way up the side of the bed, and her torso almost looked small enough that he could wrap both hands around her and touch his fingers and thumbs! And she was still shrinking! Her clothes were growing looser and looser on her diminishing frame, and as he watched, her legs straightened out as they shrank back over the edge of the bed, pulling her feet back towards the cuff of her shorts.
"Oh geeze!" Mary yelped in a much higher voice. "I didn't consider the clothing aspect!" She was swimming in her t-shirt, one tiny shoulder poking through the now-giant neck-hole with her head as she gasped with tiny hands to keep the heavy fabric from sliding down her shrinking frame. "I think I drank a bit more than I needed to" she chirped, still feeling the pressure squeezing her from all sides. She had to be under three-feet-tall now, and still shrinking! Her arms and hands were swallowed up within the sleeves of her shirt, and she scrambled to get her feet under her, feeling her legs slide easily out of her shorts and underwear.
Joe watched in fascination as the woman he'd met less than an hour ago proved that magic was real right in front of his eyes. Mary was the size of his two-year-old niece, albeit with more curves and womanly attributes. She was struggling not to slide out of her over-sized clothes but Joe could see the outline of her tiny breasts against the neckline of her shirt.
The weight of the cotton was obviously becoming too much for her, and the tiny woman was forced to let it go. As her clothes crumpled into a heap around her, Mary realized she was no bigger than barbie doll (although a realistically-proportioned one) and as naked as the day she'd been born!