Mary's large paws found the mouse vial and removed it from the box. Jess began to creep toward the door, but Mary took her other arm and braced the door shut. Jess had nowhere to run now.
Mary forced the vial into Jess' hands. "Drink it," she said.
Jess refused, so Mary snatched the vial and pulled Jess close against her large body. She held her head up and forced her mouth open, dumping over half of the potion into her mouth. She made sure Jess had swallowed it, and then let her go. Jess coughed and gagged for a moment, clutching her throat where Mary had held her.
Then she began to change. Her breasts began shrinking, and all but her original two disappeared back into her body. Her fur lightened into a very light gray as her ears enlarged, rounding out into an almost bowl-like shape. She started to shrink into her clothing, and her pants dropped to the floor. A long wormy tail slunk down her legs. It grew to the floor and then some, becoming even longer than her entire body. Her claws changed to a pink color, as did her nose. Her front teeth grew and protruded from her lips as white whiskers grew out from her cheeks.
Jess' transformation finished, leaving her only two feet tall with the body of a half-mouse, half-human. She pulled off her shirt, as it was now covering her entire body like a blanket, and stood naked in front of the twelve-foot Mary. Her tail moved slightly across the floor as she quivered, wondering what Mary was going to do with her.
"That's more like it," Mary's deep voice uttered with satisfaction.