All Grown Up (Adventure Time Finn x OC fanfic)

Grass Princess grew up very sheltered much like everyone inside the walls of her home town. From a young age she was home schooled and was taught that the world outside her home town, the Grass Kingdom, was a dangerous one filled with monsters and evil creatures. But everything changed when a deadly virus spread across her land and her parents die. A few years later she decides it's finally time to leave this life behind. Now she's left her Kingdom for the first time and she met Finn, a human boy who's duty is to protect the Princesses of Ooo. When he falls under the influence of Dark Magic it's up to Grass Princess to save him. The only problem: she doesn't know how... "I don't know how to survive without you..."