Jon and Zoe returned home later. Jon was releaved to take off Zoe's boots, whereas Zoe was just downright confused. Jon ran upstairs to grab the rock. "I wish Zoe and Mom wouldn't remember anything about this afternoon."
Jon then grew attention to his feet which were now blistered and red. "I wish my feet weren't stuck inside Zoe's boots earlier." Crap! Jon's feet weren't blistered anymore, but by the black nailpolish on the toes, he knew he now had Zoe's feet...which meant that she probably had his. He couldn't reverse his mothers wish, so the rock compensated the best it could by giving him his sister's feet (which had a vague recolection that he had for several hours now, even though he just made the wish)!