When Mary woke up, she saw the furry face of her friend Jess still snoozing peacefully. She prodded the catgirl with a paw and Jess' eyes opened by a narrow margin. She saw that Mary was awake, and stretched her limbs as a feline yawn escaped her fanged mouth.
Mary stood up on her hind paws. Her shirt was scratched and wrinkled. "I'm rrrready to grrrowww up nowwwrr," she said in a rather uncharacteristically resigned tone.
Jess and Mary walked into the kitchen where Jess had last used the vials. The mustered their feline dexterity and jumped up onto the counter. Because Mary no longer had working fingers, Jess had to feed her the vial. She drank the entire thing, then Jess capped the vial to refill it before taking her portion.
They girls grew in size rapidly. Mary's young mind had forgotten what would happen to her shirt, and she was unable to pull it off now that it was much too tight on her body. As her six breasts emerged, they tore the fabric at its seams and Mary cut the rest off with her claws.
The teenage girls were running out of room on the counter. Jess lost her balance and fell to the floor, but managed to land on her four paws thanks to feline agility. She moaned in pleasure as her body shot through puberty, her six breasts growing round and firm.
Mary completed her transformation, once again 25 years old. Sitting on the edge of the counter, she felt her curvy feminine body and purred in delight. How she had missed this! She hopped to the floor to find Jess finishing up herself. Jess was still taller than her, because she had taken slightly less of the Cat vial. Mary was about four feet, while Jess was four and a half.
"That was so much fun!" she said. "I forgot how beautiful it was to be a kid." She saw Mary's uncomfortable expression and quickly changed moods. "Mary, I'm sorry for what I did to you. I just wanted to tease you, but it got way out of hand. I don't know what came over me."
"It's all right," Mary said. "As long as you don't charge me for the clothes." She looked down at her torn shirt. "The vials seem to have a way with corrupting us."
"Well, I've had my fun," Jess said. "You're free to pick what we do next."
Mary held up her paws, shrugging. Despite growing back to an adult, her form was still very much feline. "I don't think I have much choice in the matter. Maybe I'd better become a little more human first. If you would be so kind...?"