Okay, so Adventure Time isn't really one of my favorite shows… To be honest, I can't stand half of the characters, and I hate how they're drawn. The noodle arms bother me… There are only a select few characters in the show that I actually like. Two that I adore. But I watched an episode the other day and now an idea has popped into my head and I really want to write it. So, without flames or hate mail, please enjoy…

Finn and Jake, meet Fionna and Cake.

"Okay, okay, so maybe that was a bad idea," Finn said with a happy chuckle as he and Jake his dog walked back to their tree house. Jake laughed and nodded, waving one finger up and down, wiggling it absently as he did.

A sudden female voice called out, "Finn! Jake! Guys!" Both turned around in confusion, only to find it was just Marceline with her umbrella over her head.

"Oh, hey Marceline, what's up?" Finn asked with a toothy smile.

Marceline floated over and lifted her hand under her shade and she asked, "Okay, I don't wanna scare you guys or anything, but I think you might not wanna go to your tree-house tonight…"

"Why?" Jake asked, "Is it infested with worms again?"

Marceline giggled and said, "No, nothing like that…" But her face fell and she said softly, "But I accidentally cast a spell last night… And when I woke up there was another me in my house… Only… he was a guy…"

"WHAAAAAT!" Finn and Jake shouted in unison, waving their noodle arms around wildly.

"Yeah, and so I think it did the same to you guys…" she explained further.

Jake asked, trying to clarify, "So there might be girl versions of us in our tree-house?" Marceline nodded, and the boys looked at each other.

Immediately they both jumped into action and ran as fast as they could to their tree-house. Marceline flew after them, shouting about how it was a bad idea and that they needed to stop, but they didn't listen.

Finn kicked the door open, and was immediately met with a girl in blue, wielding one of his swords.

"Hey! That's mine!" he yelled, jumping at her and trying to grab it.

But a cat suddenly jumped toward him, hissing loudly. Then Jake jumped into the fray and he stretched toward the cat, when suddenly…

"STOP!"

Finn and Jake recognized one voice as Marceline. The other sounded a lot like her, but it sounded…male...

Everyone turned and looked, to find Marceline floating next to a guy vampire with short messy black hair. Finn and Jake stared at him in shock. Their female doubles stared at Marceline.

"Who're you?" Finn demanded, pointing and yelling.

The male Marceline proudly put a hand on his hip and cocked his head to the side, saying smugly, "I'm Marshall Lee, the Vampire King."

The female Finn shouted at Marceline, "And then, who're you?"

"I'm Marceline, the Vampire Queen," Marceline responded, just as smugly.

Marshall hissed at her, "You can't be the queen if I'm king!"

"Well you can't be king if I'm queen!" Marceline spat back.

Finn, Jake, and their female doubles all looked at the vampire duo and then at each other. Jake growled at the cat, and the cat hissed at him in response.

"Anyway, Fionna, I told you and Cake not to go to the tree-house! Why didn't you listen to me?" Marshall Lee asked, completely turning his back on the angry Marceline.

Marceline turned to the boys and she hissed, "Yeah guys, why did you ignore me when I told you it'd only be trouble?"

Marshall growled lowly, "I asked first." Marceline hissed at him and looked back at Finn, waiting angrily for her answer.

Fionna answered first. "I just didn't think it was true…" She blushed a little and said, "Sorry Mar…" Marshall sighed, but he said he'd give her a break because they were friends.

"Your name's Fionna?" Finn asked, looking at the girl in surprise. He finally noticed she had a bunny hat on.

"And yours is Finn," Fionna said, lowering her weapon and straightening out a little, "So our names are opposite each other…"

"Why Cake?" Jake asked, "Cake isn't my name is girl form…"

Cake hissed, "You got a problem with cake? Dog?"

The two snarled and hissed and growled at each other until Fionna told Cake to chill and Finn told Jake to relax. Then the two looked at each other and their eyes shimmered.

Finn and Fionna felt their cheeks burn with heat, lost in a turmoil of emotions. Finally, Fionna spoke.

"Your hat is hideous…" she asked the question, and Finn's eyes popped into white wideness and they stared at each other in surprise. "Do you even have a neck?"

LOLOLOL. I shall write more. I like the idea. Guess who my favorite characters are… Guess…