I do not own Adventure Time, the Devil May Cry series, or any of the characters. Try to guess who the demons are.

Unexpected Visits

"Hey, Man," Jake said. "I know you really like Marceline and all but you must know that she's crazy right?"

"First," Finn said. "I don't like her as anything other than a friend. Second, she's not crazy. You're just not cool enough to understand her."

"You don't like her, huh?" Jake asked. "Then how come you changed your outfit for a dark one?"

Finn had changed his blue Tee-shirt and shorts for a pair of navy blue cargo shorts, a black Tee-shirt, and had gotten rid of his hat. He also traded his old shoes for black Converse All Stars. It had been about five years since the Lich had been sealed away, though, so his old outfit no longer fit him anyway. He had gone through high school so he had a class ring that he never removed except to shower. The ring was silver with an Aquamarine for a stone, a dog on one side, and a bat on the other. His blonde hair had also turned the same shade of black as Marceline's.

"Because my old outfit didn't fit and I decided that I might as well go for function before fashion," Finn said.

"Good point," Jake said. "But I still say you like her."

Just then there was a knock on the door. Finn opened it and smiled.

"Sup weenie?" Marceline asked floating over his head and grinning evilly at Jake.

"Why are you here Marceline?" Jake asked.

"Recruiting Finn into my undead army," Marceline said.

"Nope sorry," Finn said. "Not for hire."

"Yeah you're too weak for my army anyway," Marceline said.

"Bite me," Finn said sarcastically.

"If you say so," Marceline said flying over.

She opened her mouth and acted like she actually would. Jake screamed and actually got such a perfect high C that all of the windows shattered. Marceline and Finn both started laughing and Jake glared at them.

"You're so easy," Marceline said.

"Am not," Jake said beginning to pout.

Just then Marceline disappeared in a puff of smoke then reappeared behind him and tapped him on the shoulder. He jumped three feet into the air screaming and ran into the corner shrinking to the size of a mouse.

"Told you so," Marceline said while Finn keeled over laughing.

"Not funny," Jake said pouting.

"Hilarious," Finn choked out trying to stop but failing.

"Careful or you might pee your pants," Marceline said grinning.

Finn managed to stop and went to the bathroom then came back down with his father's sword.

"So," Finn said. "Where are we going this time?"

"Simple," Marceline said. "The magical instrument store. I'm getting that sword of yours turned into a guitar."

"I don't know how to play," Finn said.

"You'll learn," Marceline said.

Finn shrugged and followed her out of the tree then she flew him to the instrument store where the clerk cast a spell on the sword. Vertical lines appeared on the blade like guitar strings and the lines turned into beams of energy at the circular cross guard. They stopped at the bottom of the circle.

Marceline took the sword and easily played a very fast and obviously difficult song on it then handed it back, seemingly satisfied.(The song is Crazy Train, just because it's really hard to play at full speed.)

"I'm impressed," Marceline said. "That's actually not a half bad guitar spell. Anyway, let's go Finn."

She flew them back to his tree and they spent the rest of the day with her teaching him how to play. He learned quickly and by the end was able to keep up with her on most songs.

Marceline left about an hour before sunrise and Jake finally came out of his hiding place. He grew back to his normal size and Finn tossed him his sword.

"Dude," Finn said. "You need a sword that doesn't have a handle twice the length of the blade."

"I like my sword," Jake said.

"You can't even use it," Finn said. "Not that you need it."

"Exactly!" Jake said.

Finn rolled his eyes and then swung their father's sword at Jake's head. Jake ducked under it and expanded his fist before throwing it at Finn. Finn jumped over his fist and landed behind Jake then pinned him to the ground with the sword at his neck.

"You lose," Finn said.

He and Jake had had random sparring sessions every once in awhile and Jake almost always lost. The main reason was that Finn could now wield their father's sword in one hand and was ambidextrous.

"Try winning without the sword," Jake said.

"Why would I do that?" Finn asked.

Just then, a demon with bat wings smashed through the roof and stood on the coffee table. His entire body was made out of fire so the coffee table began to burn as well.

"Uh oh," Jake said.

"Bring it on," Finn said.

He charged forward with his sword and the demon's right forearm grew into a sword blade. He blocked Finn's blade then kicked him back. Finn's shirt didn't catch fire but there was a burn spot. Finn charged again and this time, the demon spun and knocked Finn's sword away then slashed his back. The wound was barely a paper cut but hurt badly thanks to the blade being white hot. Finn attacked again, and this time, the demon blocked his sword with his wing and slashed Finn's torso from his right shoulder to his left hip. This time, the wound would be fatal.

Finn stumbled back and swung at the demon one last time but it smashed the sword way with the back of its hand then kicked Finn in the chest again. Finn flew back and into the wall then the demon turned on Jake. Jake swung his own sword at the demon but the blade exploded on contact with the demon's neck. With that, Jake ran away. The demon then turned into a ball of flame and shot into the air. Marceline arrived a moment later and screamed when she saw the damage, mostly to Finn. She grabbed him and his sword and then she ran outside with Jake right behind her shading her from the sun.

"What happened?" Marceline asked.

"Some kind of super powerful demon made out of fire busted into our tree and beat up Finn then left!" Jake said.

Behind them, the tree collapsed in a shower of sparks. They went to Marceline's house as fast as possible and Marceline began to bandage Finn's wounds. Jake could tell that she was barely holding together.

"Marceline," Jake said trying to remain calm and forcing the words out. "You have to turn him."

"I can save him," Marceline said.

"No," Jake said. "He'll die if you don't."

Marceline continued trying to save Finn so Jake pinned her to the wall.

"Marceline!" Jake said. "Either you turn Finn or he'll die! I don't know if you care but I'm not letting my Bro die!"

Marceline stared at him for a moment then at Finn. Finally the gravity of the situation sunk in and Marceline shoved Jake away and ran over to Finn. She bit his neck then used his sword to cut her palm. Then she pressed her wound to his bite mark and held it there for ten seconds. Then she pulled it away and bandaged it.

"Is that it?" Jake asked.

"That's it," Marceline said.

As they watched, Finn's skin quickly turned paler and paler until it was the same shade as Marceline's. Then he opened his eyes and groaned.

"You turned me didn't you?" Finn asked.

"How can you tell?" Marceline asked.

"I knew the wound would be fatal and I can hear and smell Jake's blood," Finn said.

Marceline nodded and tossed him an apple. He stuck one fang into it and the color drained but did nothing to help his hunger.

"Still hungry?" Marceline asked.

"Very," Finn said.

Marceline nodded and floated out to the kitchen. She returned a little while later with a bottle of blood.

"Drink," Marceline said handing him the bottle.

"Uh..." Finn said.

"Just drink it so that you don't tear Jake's throat out," Marceline said. "Trust me, I went on a rampage when I was first turned because no one was smart enough to give me some blood."

Finn shrugged and drank the blood. His hunger went away but to him it was fairly tasteless. He couldn't figure out why but didn't really care since he wouldn't be craving it again any time soon.

He handed the bottle back to Marceline and she stared at him in shock.

"What?" Finn asked.

"You don't care much for the taste do you?" Marceline asked.

"Not particularly," Finn said.

Marceline stared at him as if he had just told her father he was retarded. Finn felt uncomfortable with her staring at him but she looked away after a while but only long enough to summon her father.

"Yes?" Abadeer asked then froze when he saw Finn. "You turned the kid? 'Bout time."

"He doesn't like the taste of blood," Marceline said.

"It's tasteless," Finn said.

"I see," Abadeer said. "Come here boy."

Finn walked over and Abadeer drove his hand into Finn's abdomen. then he pulled out a tiny piece of the demon's sword. The moment he saw it, he gasped and dropped it onto the floor then stamped the fire out and opened a portal to the underworld before throwing the piece through.

"Where did that come from?" Abadeer asked.

Finn explained about the demon attacking them and Abadeer stared at him in shock. Finally Finn finished the story and Abadeer just stared at him then took his sword.

"My God," Abadeer said.

"Who?" Jake asked.

"God," Finn said. "Humans used to worship him."

"Do you?" Jake asked.

"Yes," Finn said. "So, what's so special about my dad's sword?"

"It's one of the three legendary blades," Abadeer said. "Another is the one that gave you that cut you nearly died from."

"Who was that demon?" Finn asked.

"A monster that even Dad fears," Marceline said. "He lived in Hell. Another demon sealed him there for a long time but once the human world fell, that spell must have been weakened until it finally broke. The demon that cast the spell to seal the other one in Hell has a semi-immortal son who hunts demons. I'm going to call him."

She left and Abadeer handed back the sword then retreated to his own realm.

THE END

Read and review.