The girl formerly known as Steve looked down, stopped shaking Jon, and snatched up the strange looking stone. "Oh, what's this?" she asked. She noticed the look of horror on Jon's face and grinned. "It's important isn't it? Is this what you used to turn me into a girl or something? Well whatever it is, I've got it now, what're ya gonna do?" she asked teasingly. "Now, how does this thing work anyway?"
Jon finally found his voice, "Steph, be careful with that sto-"
"Steph! Did you just say Steph? Shut up! Don't ever call me that again!" she roared, her arousal drowned out by fury. "You don't know what it's like! I'm not just some toy for you to play with!" she said rather hypocritically. "I wish you knew how I feel right now!" she said. Suddenly, she had to look away from Jon. When she looked back, he was gone. In his place was a girl around her age who looked like Jon, with large hips and butt, and sweating from arousal. She seemed to be looking at and feeling her body in shock, about the same way Stephanie had minutes ago, and shrieking, at a loss for words.
Stephanie had an idea of what the stone was, and said, "I wish I knew what this is," Then, she understood, it was, as she had suspected, a wishing stone. She knew that any wish made by it couldn't be reversed, only modified, the limited range, power to change reality, and even some information about its origins that Jon didn't know. Jon knew he couldn't let Steve have the stone at any cost, and tried to take it from her by force, but now that Jon was also a girl, Stephanie was taller and stronger than her, as she had been when they were boys, and shoved her attacker aside, then punching her.
Steve laughed, "You know, I don't normally hit girls, but seeing as how I am one now, it's completely different,"
"Ok, Steve, I'm sorry. You can have the stone, just please leave me alone!" Jon, or rather Jane begged.
"You think it's that easy?" she shot back. "You tried to turn me into your bitch. Me! I'm not letting you go without a punishment, and I think I've got just the thing for a creep like you "