Finn is just your typical 18 year old, happily making his way through his final year of high-school. Enter Marceline. She's got a reputation for being a bad little girl and she has a bit of an ability to always get the guy. Will Finn be able to change her from a bitch to a good girl? And how long will she last before she gives in to that adorable boy? I don't own adventure time or claim to. ~CF

Weird Stuff Happen To Finn and Marceline in the Land of Ooo. (Romance) not too much though.. Just a little (Adventure) whole thing (Excitement)yass

All I can tell you is that this is about Finn and Marceline. :)

Finn is now 18, and he asks Marceline to be his girlfriend. But Princess Bubblegum feels a twinge bit jealous. What is going to happen next? Recommended for children over 11.

When Finn and Flame Princess separate, what will that evil girl do to him and everyone he knows and dearly loves, and Marcy is one of them! Finn got hurt from his battle with Flame Princess. Luckily, Marcy was there when he was in danger, and she brought Finn to Princess Bubblegum. PB gave Finn the wrong potion, accidentally (or purpose)! Now, Finn is 18, and what will happen now? LEMON WARNING

Finn has always had feelings for PB. One day the Ice king kidnaps PB so Finn asks Marceline for help. Finn spends so much time with Marceline as they try to find PB that Finn soon discovers that maybe Marceline has been his one true love.

Marceline loves Finn... But Finn doesn't feel the same way for her.

Adventure time fanfic. Finnceline!!!