What none of them realized was that the CTS virus was making Jon like his mom, Karyn like Jon, and now Sarah like Karyn. Already, Jon was more of an adult woman than a teenage boy and Karyn was more like a boy than a girl, although they each hadn't noticed anything different themselves about themselves.
Mr. Withers, the bus driver, looked in his rear view mirror and saw what looked like a grown woman sitting at the back of the bus. When did he pick her up? He shook his head, feeling confused.