(retconned so that the ring has a blue gem on it)
Loretta Jones was on her way to work. She was a secretary for a large investment company, or at least she was now. She'd been a skilled stock broker, until her boss came to her one day and said that he had evidence she'd been cheating the market with illegal insider information, and indeed, he did, but she hadn't done it! She knew he must have fabricated the evidence somehow, but she didn't know how. Not knowing what to do, she agreed to his demands, surrendering her job as a broker and becoming his personal secretary, and from the way he looked at her she knew it wouldn't be long till his demands became worse than that. She didn't know what to do. She doubted going to the police would help. The justice system was patriarchal, designed to crush women. The whole world was, and every man from her drunken, wife-beating father and all her abusive ex-boyfriends to the construction worker and her boss took full advantage of it.
She was looking down at the ground in her dismay when suddenly the ring appeared. Had she been imagining things or had that ring really just appeared out of nowhere? Regardless, it seemed to call to her, and she bent over to pick it up. Huh, it looked just like that odd little ring that her boss wore.
As she bent over to pick up the ring she suddenly felt a swat on her behind. "Nice ass babe!" Came the voice of a construction worker. She raged and cussed at him, but he only laughed. Not even realizing that she'd absent-mindedly slipped the ring on her finger, she shouted at him "I wish you knew what it was like to be a woman, then maybe you'd show some respect."
The construction worker laughed again, but HER voice came out high pitched. She looked down at her clothes that were practically falling off of her body and screamed a girly scream when she saw two huge lumps on her chest. Frantically she tore open her shirt to see, and screamed all the louder. Then she pulled down her pants to check for a dick, but there was only a pussy. Her coworker turned around at the scream and failed to realize it was his buddy. "Woe!" he said with a leering smile to the half-naked woman, "need a hand there?" Then he laughed too.
The now female construction worker frantically ran towards Loretta and pushed her up against a wall. "You did this!"
But Loretta was as lost as the construction worker. "No, I didn't!"
"Change me back!" demanded the construction worker.
"I wish I could!" said Loretta! and defensively she pushed back on the other woman's chest. The woman was pushed back, but so were her breasts! Loretta had pushed the once rather massive boobs right back into the construction worker's chest, leaving a masculine if still rather slender chest. As the construction worker charged again Loretta fled, and as the worker tripped over her own attire Loretta did manage to escape. She ended up in an ally, panting for her breath, but pretty sure she'd lost pursuit. She held up the ring and looked at it. Was this how she'd granted her own wishes? Was it magical?