Jon felt extremely helpless in the body of an infant and, despite being turned into a girl, was rather glad when he heard the wish. The room, which seemed huge from a baby's perspective, began to shrink to normal. His genitals changed and his limbs lengthened; soon he was a teenager again, and almost normal. Except, of course, for the breasts sticking out of his chest, his bra, his earrings, and everything else he would expect on a girl.
Looking himself, or rather, herself, over and checking some things with her hands, Jon found that he was still wearing slightly smaller versions of the shirt and jeans he had on as Jon--the bra, earrings, and what felt like panties and stockings were really all that seemed different. And the longer hair. And--okay, a lot of things were different.
"What did you do that for?!" she exclaimed.
"I assume you wanted to be teenage. And if you're teenage this way, I don't have to worry about you groping me."
"That's silly! There's nothing which says a girl can't..." And Jon realized that the woman was right. She was no longer magically forced to grope her. Jon, her hands now freed, grabbed for the rock. "Give me that!"
The woman wouldn't let go, but Jon, now able to fight that her hands were free, managed to wrest it away. Jon ran off out of the room; the woman didn't try to chase her. Then she must have realized letting Jon have the rock was a bad idea and frantically chased after Jon, but by then it was too late. Jon said "I wish that woman would be asleep for an hour or until I wake her up."
CLONK went the woman, as she slumped to the floor.
Now, thought Jon, she needed to figure out what was going on. "I wish I knew why I don't have to grope that woman any more."
The stone answered in her mind, "The original wish was that you have to carry around breasts. As long as you are female and are carrying them as part of your body, that wish can be satisfied without groping."
Which was good in a way, and bad in another. It meant that it would be hard for Jon to change back. If she ever did become male again, she'd find herself having to grope breasts again! She was, basically, stuck as a girl, for a rather bizarre reason.
"I wish I knew why I remembered what happened to me when I didn't hear the wish."
"Being stuck to someone's breasts can only be explained by magic. So the explanation in the new reality is that a random magical effect from nowhere made you stuck. In that reality, you would remember that you weren't always stuck."
First, Jon had to get rid of some loose ends. "I wish that Mom and that woman remember this new reality, at least unless I change back."
Which left Jon safe and not a suspected lecher.
But it also left Jon a girl, and the 15 year old daughter of an unknown woman. She walked around the house, trying to at least find her room--but she realized she had no idea where it was. Finally she found a door with a plate that said "Jonnie's Room". Entering, she saw a female variation of her own room, even though she was in an apartment somewhere else, with a different mother.
Jonnie sat down and thought. Could she change back? She couldn't become a guy even if she figured out how to word the wish--once she wasn't carrying breasts by being a girl, the earlier wish would force her to carry breasts by groping them. Could she stay a girl, but at least return to her own family? There had to be some way.