Adventure Time X Female!Reader

What if, Fiona and Finn weren't the only humans on earth. If there was another human that was closer than they thought. What if the human was a girl? What if, no one never knew. When you find her, what will you do. How will Finn react and the others?
I do not own any Art work or any videos, neither do I own Adventure Time or any of its characters.
Hope you like this!
I'm just adding you reader in the story, so different from the show series, k