Suddenly, Jon's bedroom door opened. I thought I locked that, he thought, just a second before he watched his mother walk in.
"Jon, I was wondering if ..." She stopped in mid-sentence and stared in total shock. "Oh my god! Karyn, what the hell are you doing?!" Then she looked left and right. "Where's Jon?!" she demanded.
Jon pulled his finger out of his (Karyn's) pussy and froze. He wasn't sure how to answer. His mother obviously wouldn't believe that he (or would it be she now?) was Jon.
What happened to Karyn anyway? If he had Karyn's body, didn't that mean that she had his?