"I think I can help you out, Karyn," said Jon. "But I can't give you boobs bigger than my mom's."
"Why not?" asked Karyn. "I just might want bigger boobs than her. You're stone can do anything, right?"
"Yes," said Jon. His mind raced. He couldn't tell her the whole truth, that her desire for big boobs was wish induced. She'd feel betrayed, and she'd be right. But he could tell her the partial truth. "But I saw how my mom loved her big boobs, so I made a wish of my own."
"What kind of wish?" asked Karyn, getting angry.
"She loved her new boobs so much," said Jon, "that I made a wish that she would always have the biggest boobs around, and if someone else got bigger boobs than her, that her boobs would grow until they got larger than the other breasts."
"Well," said Karyn, testily. "So how do you plan to give me what I want?"
"I could give you breasts that are always the same size as hers," said Jon. "That way, your boobs won't get bigger than hers and make hers grow. And if her boobs do grow bigger, yours will get bigger as well."
"Can you do it?" asked Karyn. "Please," she added.
"All right," said Jon. "I wish that as long as my wish about my mom's boobs was in effect," good, thought Jon, that should gover my wish without revealing the wording to Karyn, "that Karyn would always have boobs the exact same size as my mom's."
There was a flash. Karyn's boobs expanded enormously. Her shirt strained against her shirt. Jon could tell that it was quickly becoming uncomfortably tight, possibly even painfully so. Quickly, he added, "I wish that Karyn's clothes would adjust themselves for her current bustline." There was another flash, and Karyn's clothes expanded to keep up with her boobs.
"Thanks, Jon," said Karyn, "for the clothes and the cleavage. I wonder if your wish for my clothes fitting will wind up applying to all my clothes and not just the clothes that I'm wearing."
"Not sure," said Jon. "My wish did only say 'your clothes,' not just the clothes that you're wearing right now. But we won't know how literally the stone took my wish until we check."
"If it hasn't," said Karyn, "at least I'll be able to go glothes shopping." She giggled at all the new outfits she could now purchase for her wonderfully expanded bosom.