The first time Finn ever met Marceline he was captivated by her beauty. Sure, she was scary and a vampire, but get past that and she was like any other girl. Of course, Finn had to hide his feelings, bury them within the depths of his heart. He believed he didn't have a chance with Marceline, and didn't want feel the same heart break and loneliness he felt when Princess Bubblegum rejected him. He promised himself that he would never feel that way again. That didn't mean Finn couldn't be near Marceline. He loved and cherished every moment they spent together. But, the more more he was around Marceline, the harder it was for him to hide his feelings. Finn knew he would one day confess to Marceline, ultimately ending in his heart being crushed. It took him 3 years to finally come to a decision. He decided to leave his tree house and avoid Marceline for as long as possible. He returned a year later, having completely forgotten his feelings for her...
Marceline always enjoyed being near Finn. He always seemed to be there when she needed someone to comfort her. She began to develop feelings for the human boy as he seemed more involved in her life than anyone else. Marceline also knew that Finn had feelings for her. Although, because of Bonnie's rejection or because Finn was shy, Marceline understood that he wouldn't be declaring his love anytime soon. This frustrated her because she wanted him all to herself as soon as possible. Another woman could snatch him up and she didn't want that. 3 years passed and Finn still never confessed to Marceline. She was getting impatient. Marceline decided to take the initiative and confess to him. When she arrived at the tree house Jake broke the news to her: Finn left and wouldn't be coming back for a while. This devastated Marceline, but she would wait for his return. She moved into the tree house and waited, until one year later when Finn finally returned...