Jon's boobs

Jon looked down and saw that his top had vanished, only to be replaced by a cute white bra. But the bra wasn't empty. It was filled by two perfectly formed boobs - his sisters! Jon grasped them in panic. That must mean that Zoe had his chest... Zoe unlocked the bathroom door and stormed past Jon into her room. After a few minutes she emerged. Jon was not surprised to see her wearing her favourite black bra and fishnet top - she was a goth after all, and liked to show off her assets, but this time there weren't any assets to show off! Where Zoe's boobs were was a completely flat chest - Jon's! "Stop looking at my chest, perv" said Zoe, and walked down the stairs. This was getting crazier and crazier!