"I don't think they have seeds," said Jon. "Anyway, can you fix this? Please?"
Karyn said "Fine, lend me the stone. I promise, I'll erase the whole thing."
"I don't like that look in your eyes," said Jon.
"I want to borrow the stone."
"What?"
"Because I've decided to try planting the seeds. But when I erase this, all of your weird breasts will be gone, including the seeds. Come on, it's harmless."
Jon looked at Karyn suspiciously, but let her take the stone.
"Don't worry," said Karyn. "I wish that when this paper is erased, and Jon doesn't have watermelon breasts any more, they'll come off and leave him like he was before, instead of disappearing. I wish memories of Jon being like that all his life will still disappear." She put the stone back in Jon's hand and said "See? That's all. Now let me erase this."
Karyn rubbed out the words with her eraser until the paper was blank. Jon felt himself losing sensation and it was like he had two lumps of something as fake breasts. They slowly slid down his shirt until he was able to remove it and pull out two breast-shaped half watermelons.
"Give me that," said Karyn, and plucked a seed from the exposed surface. "Now we're planting this."
"You must have a lot of patience," said Jon. "It'll take a while to grow."
"Really? Then can I borrow your magic stone again?"