Jon was more than a little nervous about what Karyn was going to do next, and he managed to peek at what Karyn was writing as she was writing it. To his relief, she had only written "Jon has furred lower arms and legs, claws instead of fingernails, and fox paws for feet."
Suddenly, Jon's mind was flooded with memories of growing up that way, but he still retained the knowledge that he'd previously only had fox ears and a tail (and, of course, Karyn's dubious allegation that he'd originally been a normal human.)
"Listen," he told Karyn, "maybe we'd better stop this before we mess up reality too much."