This is the last chapter! Thanks to everyone who's been favorite-ing - feel free to review as well! ;)

I am not affiliated with Adventure Time or Taylor Swift.

This slope is treacherous;

This path is reckless

This slope is treacherous -

I, I, I like it

This hope is treacherous;

This daydream is dangerous

This hope is treacherous -

I, I, I like it...

Marshall Lee stood outside of the treehouse. It had taken a bit of courage to follow Fionna back home after the events of the previous night had come crashing back to him. He understood why she had come to the conclusion that she did, but he also wanted to make sure she understood what had really happened. If she still chose to hate him, that was her bizz, he probably deserved it anyway for picking on her for so long, but he just wanted to make sure all the cards were out on the table before she jumped to conclusions.

So he had followed her (the stupidly bright sun made sure he brought his – he loathed the word, it was so uncool - parasol), though he had stood outside for quite a while before gathering the courage to knock on the door. He knew he might be making a mistake, that perhaps it was better if she came to him, but he just couldn't sit and wait.

And so he was half-surprised when she actually answered the door.

"F-Fionna!" He said, taken aback.

"Uh, yeah dude, this is my house?" she avoided eye contact.

"Look, I just wanted to say, I'm -"

"I'm sorry, Marshall!" Fionna suddenly exclaimed. Now he was even more confused. "I know now that you didn't do anything to me last night, that you actually took care of me and stuff, so...I'm sorry for what I said this morning."

Marshall Lee stared at the small girl in front of him for a moment, trying to comprehend what was happening. She was apologizing to him. Okay, this had to be a daydream or something. But it was too real to be his imagination... Either way, he had to say something.

"It's okay, Fi. I understand why you felt that way, though, to clear my name, I fell asleep floating above the bed; I have no idea why I woke up so close to you."

Fionna smiled ever so slightly, because she knew he wasn't making this up for once. But she wouldn't tell him of her "dream" - it was more... fun? interesting? that he didn't know for sure. She believed him. "You wanna come in?" she asked, stepping aside and holding the door open.

"Of course," he smiled, "Inside is a heck of a lot better than standing out here with this stupid parasol," he said, making a face and closing it as he came inside, out of the sun. "So does this mean you forgive me?"

"Of course I forgive you, ya goof," Fionna playfully pushed the vampire. "But uh, look," she suddenly turned serious, remembering Cake's words, "There's something I kind of want to talk to you about." She motioned him to sit on the couch; he complied, and she sat next to him. "Marshall Lee," she took a deep breath, and he knew something serious was about to go down; she rarely referred to him with his full name, and she was avoiding eye contact again. "Marshall Lee, you are one arrogant, terrifying vampire. You're a total jerk, and I'm pretty sure Cake will never not be completely un-afraid of you. You always mess with me, and laugh even when it's totes not funny. But despite all that, there's something about you that...I dunno. Maybe under all of that, you're not as bad as you pretend to be, maybe -"

Fionna was cut off in her heart-spilling speech as Marshall Lee's lips collided with hers. Her eyes shot open in surprise, and she almost pulled away...until she realized, this was what she wanted, after all. This was happening, now, it was real, and it wasn't a joke, and it was terrifying and amazing all at once. She hardly knew how to feel, so she let her instincts take control, and she felt her arms wrap around his neck, pulling him closer. But Marshall pulled away almost as soon as she had done so.

"Fionna, I think I love you," Marshall Lee said softly. "I know it's stupid, but I had to let you know."

"This isn't a joke?" Fionna asked warily.

Marshall smiled. "I get why you'd think that, but no, this isn't a joke this time. Or a prank. I really mean it, Fionna."

Fionna blushed. "Oh, ok, well that's good since y'know, I might maybe love you too."

"Fionna," Marshall said calmly, and Fionna looked at him, "If you blush any more, I won't be able to resist drinking that pretty pink from your face."

Of course, this only made her blush more. "S-So what, are we like, boyfriend and girlfriend now?" Hopefully saying something would reduce the burning in her cheeks.

Marshall Lee shrugged. "I guess so."

"Prince Gumball's gonna be mad. You know he doesn't like you."

"Pft. So?"

Fionna laughed. "Yeah, you're right, who cares what anyone thinks. I-" Fionna's stomach rumbled loudly, reminding her she hadn't had breakfast.

"Want me to make you breakfast, honey bunny?" Marshall Lee smirked.

Fionna deadpanned. "Dude. Don't make this weird."

"You know I'm going to, just to bother you. How long have you known me again?" Marshall smirked, and Fionna rolled her eyes. He laughed and kissed her on the forehead.

"I think there's some leftover spaghetti," she said, motioning to the fridge.

"Spaghetti? For breakfast?" he raised an eyebrow, feigning shock. Then he smiled. "Sounds perfect."

As she watched the vampire heat up the pasta, Fionna thought on all of the challenges waiting for the two. She knew they might not be together forever - she knew it was pointless to hope for them to always stay together – but she couldn't help daydreaming about the wonderful possibilities. Maybe this could work out after all.

Dating a vampire was so, so dangerous – but that sense of danger just made Fionna like it even more.

Thanks again for reading! I hope everyone enjoyed this :) Keep an eye out for more from me - my next one might be Finn/Flame Princess, but I'm def doing more Fiolee too.