"I wish I knew if Karyn was a lesbian yet," Jon said. After the stone glowed, Jon got his answer, which was YES.
Jon's heart sunk. He was too late. His best friend had already succumb to the "lesbian outbreak".
But maybe there was still a chance to make things right. If he could make her have an orgasm (by some method), that would make her fall into the suggestive trance, which would allow Jon to manipulate her into being normal again. His mood brightened again. Perhaps all was not lost.
He could even do the same thing for his mother.