"You should be able to figure it out," said Karyn. "I used the bracelet to change your voice."
"Then it really did work! You know, this is sort of fun."
Karyn thought that that seemed completely out of character for Jon. Then she realized... she had made a statement "it's going to get a whole lot more fun for both of us now". Until she changed that, Jon would find it fun to be changed by the bracelet. In fact, she thought it was fun to change him too...