Joanna watched her sister get into the shower after waking up from her pleasure induced nymphomania. It had been fun watching her finger herself to orgasm four times. She didn’t even think anything was wrong. Yes, Joanna had grown up as a girl, but she hadn’t liked it one bit, never. Now, she could finally get her revenge on the big sister that made her grow up like this. “Hmm,” Joanna thought. “She won’t be the big sister anymore.”