Share the stone with the body

Karyn strutted over to the mirror and posed. "You know, I always thought you had a nice bod Jon. Now I know WE do." "KARYN! are you insane?! Wishes can't be undone!" Yelled Jon through the same mouth. "Oh shut up Jon. This could be fun" said Karyn. "Here, I wish that Jon wouldn't hate the idea of sharing a body with me. There, are you better?" "Almost. I wish that whenever we have the stone, we have to alternate using it. Meaning, I just made a wish, so I can't make another one until you do, then you can't do another wish until I do again." Karyn shrugged Jon's sholders, "Fair enough."