(Author's note: Of course, this takes place before The Great Mushroom War. Feel free to do any other Ooo-related tfs)
None of the vials seem interesting, but one catches her eye.
Hidden right behind the horse vial is one with Korean writing on it, and filled with a rainbow liquid.
Lucky for her, she knew a bit of Korean, and was able to roughly translate the writing to mean "rainicorn".
"What's a rainicorn?" she asked herself "And why is it in Korean for that matter? Well, it must be horse-related, so at least that gives me a clue.
Maybe I'll only take a small sip. After all, if I don't like what it does to me, I can always reverse it, right?"
So Mary took a small sip from that crystal vial, and it tickled the inside of her mouth, and then her stomach.
She felt happier for some reason, and she looked at herself if a mirror.
Her face seemed a bit pink, her nose looked a bit flat, and she could see a small, white bump on her forehead.
Her hair seemed to be a bit longer with a few blonde strands.
Her hands looked a bit green for some reason.
She felt a bulge at the base of her spine, like she was starting to grow a tail, and her neck seemed a bit longer.
Her body also felt a bit longer, and when she looked at her skin under her shirt, it looked like a rainbow-type pattern was starting to form.
For the first time, Mary noticed she was floating an inch off the floor. It shocked her a bit, but she found she liked it.
"Eeh-hee-hee. Wow, this is amazing!" she said, her voice sounding a bit lighter and bubbly "Just a sip did THIS? I wonder what more of it would
do, or maybe I can give some of it to someone else so they can know this joy?"
What does Mary do?