Closer
In this story, the main character of your choosing accidentally becomes the body part of someone else. This could be the body part of their significant other, a crush, or someone completely random. As far as how it happens is up to you. It could be a genie (or other type being or object capable of granting wishes in a bad way), or a spell gone wrong. Can they move or speak on their own, or are they only conscious of their surroundings without the ability to express themselves? Which body part...