This is my first fan fiction! Please don't say anything mean in the comments! This is basically an alternate universe where Marceline is the Ice Queen. Also Flame Princess is good and Finn is like Princess Bubblegum to Marceline the Ice Queen.
"Marceline! No! Stop!" Simon's shrill voice filled the air around the clearing. Marceline turned around with the crown in her hands. "Marceline! Listen to me, put the crown down!" Betty appeared in front of Simon grasping his shoulders. "Simon, listen, I came here from the future, a future where the crown makes you crazy, a future where you steal women, and it's horrible." Simon thought about what Betty had said and let Marceline put on the crown.
100 years later Marceline was the Ice Queen, stealing men because she missed Simon so much. Finn became her main person to steal. Until Bonnibel got in the way. "My prince! Finn! Noooo!" Princess Bubblegum had gone too far in Marceline's eyes. She froze the princess in mid-walk. "I love you my prince." As she leaned in for a kiss, Finn pushed her away. "You may like me but I don't like you. So just get over me." "Finn? Please. I love you more than anyone else will. We were meant to be together. Please come back." She had whispered the last part because she didn't want Finn to hear her. "LET IT GO MARCELINE!" So she let him go and she took off the crown and become her old self. She looked in icy mirror and thought, "What am I? What have I done?!" Ever since she put on that cursed crown a hundred years ago she hadn't been the same. She hated who she was now. But she couldn't think about that now. She had to figure out how to apologize to Finn.
Finn tossed his back pack on the floor and yelled, "Betty! Simon! Jake! I'm home!" Finn was found by Simon and Betty who then adopted Jake and now they live together in the Tree House. Finn loved living with Simon and Betty but sometimes they fought. Simon would tell him stories about how Marceline used to be. She was sweet and chaotic neutral, not evil. "Finn honey, you can go and hang out with that nice princess you keep talking about." Betty was referring to Flame Princess, Finn's new love interest. She was perfect for Finn. She loved all the same things that Finn did. They had already started dating.