Disclaimer: I don't own Adventure time just Trenitus

Marceline lazily floated to her house in the pale moonlight and she was silently cursing Finn and Jake for the wish they made. At first she would have been able to walk among other people without feeling like an outcast, but ever since the land of Ooo was turn human and modern that's the only thing she felt like. That wasn't even the worst part, the worst part was her need for blood, she didn't think she would ever get used to the metallic taste, but she needs the damned stuff to survive. When Marceline reached out open her front door she heard something move behind her, she spun around at vampiristic speed, but she didn't see anyone. Then she felt the wind rush past her a dagger plunged itself into a tree near her.
"Dude, what the hell is the matter with you?" She heard a guy whisper

"Sorry, clumsy me, I'll stay out of your way." She heard a quieter voice

"Trenutis just stay the hell out of my way." The other guy told Trenutis
A tall, muscular guy in his mid to late 40's climbed out of the bushes in front of her, aimed a crossbow at her unbeating heart, but he never got to use it as a another guy tackled him from behind. The other guy looked like was in his early to mid twenties, and he was at a serious disadvantage against the older guy who soon over powered him. Marceline quickly jumped in, pulled the older gut off of Trenutis, and slammed him the nearest tree.
"Leave and never come back or else I'll kill you." Marceline hissed
"Marceline!" Finn yelled as he charged at Trenutis
"Finn wait!" She yelled but it was too late
Finn's sword flew down at Trenutis but it just bit dirt.
"Kid, leave the fighting to the adults." Trenutis told Finn coldly from beside him
Finn swung again but Trenutis batted his sword away. He followed through with a leg sweep and snatched Finn's sword from him. Trenutis unsteadily walked towards the guy and Marceline, he gently moved Marceline out of the way, and let the older guy move away from the tree.
"Let's settle this the old fashioned way." Trenutis told him
"Okay, loser dies." The older guy tells him
"Sure, fair play no dirty tricks." Trenutis told him
The older guy quickly drew his sword and swung at him. Trenutis easily step out of the way as the older guys sword buried itself deep into a tree in front of him, Trenutis stepped forward and kick the older guy back.
"Learn this Govian, never swing at me." Trenutis told him
Govian grimaced as he tried to get to his sword, but Trenutis blocked him.
"Let's make this fair." Trenutis told Govian while taking both swords and tossing them to the side "Lets just use our fist."
Govian looked at his hands as if he didn't know how to use them by themselves, and Trenutis punched in the stomach and kicked his knee. Govian went down with a cry and then a grunt. Before Govian could get up Trenutis picked him back up and slammed against the nearest tree. Blood splattered over his hand as an outcropping tree branch stabbed through Govian heart, Marceline licked her lips at the sight of Govian's blood but before she could drink any Trenutis caught some of the freshest blood into a strange container. Marceline looked at Trenitus as he started to quickly mix a strange purple powder into the blood then he tossed it to Marceline, when she took a sip of the blood she could explain the flavor, it didn't taste rotten and metallic like usual but it tasted sweet and fruity. She was about to ask him about until she saw him easily pick up Govian's limp body and tossed it down the hill, when it hit the river bed it was instantly whisked away by the strong currents, and when Trenitus turned towards Marceline again he seems 4000 years older literally.

"You okay Trenutis?" Marceline asked him

"I don't know I don't feel so good." Trenutis told her before passing out

Marceline caught him as he fell but she was caught off guard as his weight was more than she expected and she fell to ground with him. Finn tried to pull Trenutis off of Marceline but he wasn't even strong enough to budge him an inch. Finn backed up as Marceline shoved her hands between Trenitus and herself and she gently moved him off of herself. Trenitus flopped off of her to her side as the Flame Princess who was now just a 15 year old teen girl who amber orange hair, and a fiery temper to match her old self. She had taken up the name Fiona Periwinkle, she still loved Finn even though he had destroyed most of their kingdoms, but he had gotten rid of the lich that had plagued the land of Ooo for so long. After Marceline got up she pulled Trenitus to his feet, had Finn open the door to her house and she laid Trenitus onto her bed.

"What happened?" Fiona asked Marceline

"This guy Govian had jumped out of the bushes behind me, he was about to shoot me when Trenitus tackled him from behind, and then that when Finn came along." Marceline told her

"I owe him an apology then." Finn commented

"Yes you do owe him a huge apology, but you got to wait until he wakes up." Marceline told him

"Okay just call me when he wakes up." Finn told her

"Okay, I might do that, but then again I might not." She replied without really looking at him

"I guess we'll see you later Marceline." Finn told her

Finn and Fiona walked out of Marceline's house and she was sure that they were gone she walked over to the kitchen and quickly made herself and Trenitus some tomato soup. After she sat down in a chair by her bed, she started to feed Trenitus, but after a few minutes of Trenitus not taking any of it she just placed his bowl down and drank her tomato soup. She looked around for anywhere else to sleep since Trenitus was in her bed, after a while she found herself staring at Trenitus and thinking about how warm her bed be right now with a body already in it. She tried to think of something else but when a cold chill went down her spine she quickly jumped into the bed with Trenitus. She wrapped her arms around him, when she took a shallow breath she smell Trenitus's scent she smelled the scent of earth and an animalistic scent she could really place. She soon fell asleep with Trenitus's strong scent still running through her head.