Close friends

Sarah grin as she says.
"I wish Sarah and Jon were standing in front of me but unable to move until I say so."
A flash engulf the room and Karin and Jon are figed in front of Sarah.
"What... Sarah... ? What are you doing ?" say Karyn.
Sarah smile evilishly
"You two, always together and throwing despising look at me... I think it's time for you to learn your place. If you like to be together that much, let's give you this..." She says "I wish you'll merge into one body, the body of a ..."