Adventure Time Academy with Fiona the Human - Fiolee (Rated M)

Fiona has fallen through a wormhole into a world very familiar to our own. She awakes in an alley in the City of Eeee. After being taken in off the street by a very successful and rich human version of Cake, Fiona is enrolled in a prestigious private Academy, St. Vincent, where she meets the Preppy Class President with a broken heart and a troubled past who reminds her of a certain prince, a neighbor named Finn and his best friend Jake who both love karate and action movies just as much as she, and the rich bad boy bass player and heir apparent to the Methuselah Clan criminal enterprise who reminds her of her own vampire king. Now, Fiona has found herself caught in the middle of a game she didn't even know she was playing as past feuds are reanimated and her alliances and friendships are tested. As feelings escalate and tension rises, what is Fiona willing to risk for love and a chance of going back home.

This is a "harem" because all three main male characters are pursuing Fiona to varying degrees, but ultimately this is a fiolee Fan Fic.