Kat laughed evilly at Dan's misfortune. But he still looked to much human to her. If he could hide the tail and short fur he would still be mostly normal, even if he couldn´t speak anymore.
“Get your four filthy paws off my carpet, you rat.”
Dan was thrown forward, instinctively putting his hands to break his fall. After landing with a loud *squeak* on the ground he could see his hands had deformed, his thumps nowhere to be seen. Instead he had paws with small, dull claws. Meanwhile his feet had changed too, but he couldn´t see them with his socks still on, which felt uncomfortable now. Then dirty specs emerged from their skin, making him *eeeeeps*, much to Kat's delight.
“Haven´t you heard me, off the carpet, you filthy rat.” Kat exclaimed evilly at him.
Suddenly Dan could hear better as his ears started to grow bigger. Slowly more dirt emerged from his skin, adding even more smell to him. The dirt stuck to his short fur, making him look even filthier. But Dan was to shocked by all this to move like Kat wanted him to. His squeaking got even louder to himself through his bigger ears.
Kat again laughed at him. “You are a rat, so you should be much smaller than you are now. Shrink until you fit in my palm, filthy, little rat.”
Dan squeaked in panic as everything started to grow around him. As his body was shrinking his left sock stuck with his claws, pulling it with it. His shirt collapsed on him, and soon he sat just before the flattened shirt where his stomach had been before, his left hind-paw still stuck to his old sock. And he could smell that it reeked, which could be a side-effect of Kat's first comment.
Kat looked evilly at the rat. Before Dan could move, she grabbed him around his middle. “Now that you are really just a rat on the outside, maybe you will know your place. Now as I haven´t a cage or something else for you to live in, this will need to do, little rat. So thanks for bringing it with you.”
Kate laughed as she freed Dan's left hind-paw of his old sock, only to drop him into it, earning another loud *squeak* from him. Then she used her magic on the sock, closing the opening above Dan, trapping him in the dark, reeking sock. She also gave herself the ability to look through the sock, so she could watch him suffer. She cleared the air around the sock of the smell, but not the inside, before hanging it to the side of her desk, stuck by magic.
Meanwhile Dan squeaked in panic and disgust. He couldn´t see anything as it was complete darkness inside. He couldn´t block the smell to his now sensible nose, and moving around was limited through the sock hanging. He tried to tear the sock, but his claws weren´t sharp enough to rip it, and his teeth couldn´t get enough grip on the cloth, while also adding the bad taste of the sock to the smell.
Kat again laughed at his attempts to get out, but made the sock more robust just to be safe. But she got an idea how to be even meaner to her former brother.