Amber pushed past Jenna and ran up the stairs. Jenna got up and chased her, but Amber made it to the room first and locked the door.
The stone was on the top of the dresser, the same place that Amber had put it when she was Jenna. Quickly she grabbed it.
"I wish that me, Amber, Tiffany, and Karyn would be swapped back into our proper bodies, but I'll keep the stone."
Which, fortunately, worked.
The reason why was complicated, but basically it was that wishes which don't change reality could, indeed, be reversed. When Tiffany had disappeared, the tape showed Tiffany disappearing--it didn't change reality so that Tiffany had always been in Jon's house. Even the original wish that swapped Jon and Amber didn't make Amber think she had always been in Jon's body. If a wish changes reality, reversing it changes reality too and removes all the effects of the wish. If a wish doesn't change reality, "reversing" it just causes a second effect to happen, without really reversing the first one, since people still remember being swapped or transported or whatever.
But anyway, the wish worked. Jenna was in her own body, but not in her room.
"I wish that Amber and Tiffany were back where they came from and nobody except me remembers they were here."
Which, thought Jenna, left everything as normal. (The wish that she answer to 'Amber' didn't say only 'Amber', so she could still use the name Jenna as well.)
Needless to say, things weren't normal. There were some wishes left that Jenna didn't notice.
First, Karyn was a sex-crazed lesbian bimbo.
Second, Jenna was a girl, Richard's (the porn director's) bisexual lover, and Richard still wanted the stone...
