This is my first Adventure Time fanfic. I'm aware that this is quite a short chapter. The others will be either as long or longer than this. Sorry, but that's how I write.

So, yes, this is in the gender-swapped world. Except, it's my fanfic, not Ice King's. I hope you enjoy. I would also like feedback, if you readers don't mind.

I do not own Adventure Time, sadly.

OH! Should mention, this is almost directly after the episode "I Remember You".

Incredibly loud guitar chords could be heard, coming from a cave. And from within, the sounds came from a house. And in that house, a certain Vampire King floated in his living room, strumming a sick guitar. The completely insane rock song suddenly ended as an annoying techno tune played from a keyboard in the corner. Marshall Lee groaned. "Are you joking? She left that here...as if I need another reminder." He shut off the dumb keyboard and picked it up. He left his house, taking off into the air.

The dark-haired vampire king eventually crossed the Grasslands and floated through the Ice Kingdom, sighing, carrying the keyboard under his arm. Penguins ran around in the snow beneath him, and Fionna and Cake could be seen building a snowman in the distance. It was quiet. The sun had just gone down, and moonlight was reflecting off of the snow, making the world seem a little brighter. It was nice. Pretty, at least.

Marshall Lee took a deep breath, then flew through the triangular entrance into the mountain that was the Ice Queen's home.
"Hey, you left your keyboard thing at my house!" He called out, though no one answered. He set the keyboard down, looking around the room. The blue icicles, hanging from the ceiling, dripped a few times. Gunthette, Ice Queen's pet penguin, waddled by. She turned and quacked at him, before wandering off.
"Hello? Simone? Are you even here?"
Still, no answer, so he continued to look around. A recliner, the cage that usually held Ice Queen's captured 'future husbands', a drum kit...average stuff. He wandered over to the drum kit and sat, picking up the drum sticks. He smiled, playing loudly for a while, the drum part from the song he had been playing earlier. Still, no one appeared, so he stood and continued his search. Eventually his eyes stopped on the Ice Queen's golden tiara, resting on a small table. A grin spread across the vampire king's face, showing his fangs. "What is that doing here?"
He walked over to the table and picked up the tiara.
"Huh, awesome." He looked it over, the red gems and the gold crown itself. He raised it up and placed it on his head. Instantly a splitting headache made him drop to his knees, wincing.
"W-what the-?" As suddenly as the pain had appeared, it stopped. There was a moment of calm, of absolute clarity, before voices filled his head. One or two, but it sounded like millions. They promised power, and salvation. "S-salvation...from what?" He thought out loud, eyes shut tightly.
His hair grew longer, down past his chin, and he felt himself grow cold. Yet, it wasn't an uncomfortable cold. It was welcome. It calmed him. His eyes opened, and they were...different. Icy.
We can show you the power of frost.
We will show you the secrets of snow.
The voices were whispering through his mind, and they were...convincing.
Marshall Lee flew outside, looking around.
Test out the power, half-demon. See if it suits you.
He sliced the air with a clawed hand, and a bolt of ice shaped like lightning struck the ground. His grin grew wider, and a strange, insane glint showed in his eyes. "I...I feel it. The power." He sent another ice bolt thundering to the ground.
We can show you so much more, Marshall. There's much more power, and it can all be yours.
The voices appealed to his darker side, the little bit of evil that existed in his heart. He appeared to grow visibly darker. He felt the evil, the darkness, the cold within him grow.
Freeze everything, half-demon.
Marshall Lee flew through the air, snow and ice falling from his open palms, down onto the ground, as he flew through the Grasslands, towards the Candy Kingdom.

"Hey, Cake, did you see that?" The girl in the white bear hat asked, pointing at the fading figure of Marshall Lee.
"Sure did." The magic cat replied. "Are we gonna go after him?"
Fionna the Human nodded. "Yeah. Just to make sure he's okay."
Cake the Cat tripled in size, and Fionna jumped on her back, and they took off towards the Candy Kingdom, after the Vampire King himself.
"Whaddya think's wrong with him?" Fionna asked.
"No idea, hun." The cat replied. "But it doesn't look too good."

Marshall Lee raised his hands to the sky as he floated over the Candy Kingdom. "Aha, ahahaha...let it snow." A heavy snow filled the air. The Vampire King sent a few ice bolts down, crushing buildings. He froze over the streets and part of the castle.
"I'll...I'LL FREEZE EVERYTHING!"

There you go. Lee's gone coco-nuts, and is freezing everything. I will actually be releasing new chapters quite frequently, so stay tuned if you liked it. Yes, I had some trouble with my Copy N' Paste. The indentations are gone. Halp, please?