Melanie saw how her body started to shake a little, she wondered what was happening until she lifted and saw one of her arms, turning her partially unshaved hairs into grey fur which quickly started to expand through all her body.
"Wh-what is is!" Melanie yelled.
"Oh, just a little trick, you know" Beth smiled, "the ones you don't believe in".
The grey fur already covered all her arms, expanding to her chest and legs, "Beth! What did you..." The fur wasn't the only problem, she was also getting smaller, feeling how her clothes looked like 3 plus sizes than her.
As she was getting smaller and the fur appeared she grew a tail above her butt, a pinky and hairless tail as her ears grow exponentially bigger. Took Melanie a pair of seconds to realise what was happening to her, she was turning into a mouse.
"Beth! Beth!" Her voice was getting higher looking how the world around her seemed to be giant and her nose turned into a snout growing a couple of whiskers, as her breasts shrunk and grew three pairs of nipples below them.
After some seconds Beth stood up looking at Melanie's clothes scattered on the floor, watching a small bulge move inside them revealing to be the new small form of her roommate, she stretched her arm and grabbed her.
"Look how cute you're now, I could get used to your new body" Beth said with a evil grin in her face.
"I already said I'm sorry, why did you have to make this" Melanie spoke in a shrill voice.
"It's funny to see and hear you struggle like this, that's why I kept your voice, and besides I didn't like you since the moment we met". Beth moved her hand grabbing the mouse in front of her face, "but I have some plans for you, my little friend" Beth giggled as Melanie was afraid of her.