You hear the perverted boy say it and by that point it’s to late the genie has granted the wish. You see a bright light that covers your vision. Your vision starts to return but your seeing yourself naked being painted.
“This is weird what happened to that boy?”
You look down and see that you no longer have breasts. Your no longer female you must have switched places with the boy when he wished all your stuff belonged to him. In some ways this is good as your no longer naked or a women.