Use the coin to give her more power

Hearing that, Tom struggled under her bulk for a few pitiful seconds before asking, "M-mistress, may I get out from under you so I can get to the coin?" Even as he spoke, there wasn't a synapse in his brain that even considered using the coin to turn her back. Why would he do something like that? He was too enthralled by what she had become.

"Fine," she growled, getting off of him so he could do just that, scampering away to fetch the coin from on top of the dresser. She laughed mockingly. "It's pathetic how you couldn't even get yourself out, you had to beg me to let you go. Such a weak little human...but one I find myself fond of nonetheless."

Coming back to her, holding the coin, he raised it up and asked, "What do you want me to wish for, mistress?"

Sarah hummed, considering the question. "I'd make you start by making my change permanent, but you're such a fool that you didn't even think to put a time limit on the initial wish. Though, maybe that was on purpose. Maybe you never wanted me to change back into that small, weak human that I was before." She smirked as she spoke, and Tom wondered if she was right. "As for what I really want, I need more power. Power I can use to punish you with."

He shivered at those words, so very eager to be punished, to do anything she wanted. But he did have a question. "Aren't you already extremely p-powerful, mistress?" He felt silly asking it. Of course Sarah was powerful. Overwhelmingly so.

"I am, obviously." She reached down and snatched the coin from Tom's hand, something he couldn't even attempt to prevent. "But I can't use this, now can I? No, for some fucking reason your pathetic mouth is the only one the coin listens to, and I'm the only one it can affect. At least...directly. So what you're going to do," she growled, tossing the coin back into his hands, "is wish to give me the power to shape other people's bodies and minds as I see fit. I'll leave exactly how to your perverted imagination." Sarah grinned at him, and Tom felt strangely proud, as though she had just praised him.