Bubbline! My OTP. Time to add to the long strings of fanfics. This is about Marceline being ordered by her father to assasinate PB in order to take over the Land of Ooo, but ends up falling in love. Found the prompt on OTP Prompts tumblr

Disclaimer: I do not own Adventure Time. All rights go to Pendelton Ward, you hilarious God you.

Warnings: fluff and lime, shaken not stirred.


I Can't Kill Her

Marceline entered the Candy Kingdom with a satchel full of clothes and a mission. As she advanced up the annoying yellow road to the castle, the vampire scowled at the sugary subjects clumsily falling and naively laughing around her. It's a shame that they're going to be possibly enslaved after the nightosphere was finished with them. Her father Hunson Abadeer the Lord of Evil concocted a plan with her as the center.

It was quite simple in nature actually: Find the princess alone, kill her, and return to her father. Then the chaos of a fallen ruler will allow him to steal the royal thrown like candy from a baby.

Some strings were pulled to get her the position of the royal adviser, a job that gave her personal access to her royal highness without any overbearing guards. So she accepted the easy job to get back in her father's good graces considering she would soon be the queen of the Nightosphere.

'Time to learn the family business,' she thought once she entered the edible castle. Greeted by a short peppermint man, she assumed the butler, Marceline was led to her chambers.

"This is where you'll be staying if all goes well. It's connected to her majesty's room right next door in case she needs your assistance." She observed the medium sized room oozing with pink and yellow decorations from the curtains to the king sized bed in the center that she poked to test the softness of.

Just like cotton candy as suspected.

The peppermint butler headed for the door, but was stopped by Marceline asking, "What do you mean 'if all goes well'?"

He coughed, embarrassed by the warning hint she caught. "You see, my princess Bubblegum isn't very... trusting of many. I've known her for her entire life and she still doesn't trust me. Let's just say royal advisers are often replaced. Any more questions?" She remained silent. "I'll be on my way then. Don't hesitate to ask me for anything." And what that said, he left and she was once again alone.

The gray haired teen floated to the white dresser and shoved the light load of clothes she brought in the drawers, then jumped in to the softness that was her bed, her body sinking like she was in a bean bag chair.

This mission would probably take a day to complete if Marceline took it seriously, but to her this was like a mini vacation.

Even if she's stuck in a fat girl's dream kingdom.

Still, a vacation was a vacation and she surely needed it. Lately her father has been showing a growing interest in her now that she was of age to take the throne, much more than he normally did which was saying a lot considering they had a bad relationship. She never has time for her music anymore which can totally stress her out.

A sound pulled her out of her thoughts, a soft, timid, melodious sound that came from the room next door. She had to hear Marceline floated towards the door, leaving it cracked open to peek at her mysterious target.

A slim figured appeared in her line of vision. Her skin a light pink, the oblivious princess wore a darker pink tanktop and fluffy pajama pants, gooey hair in a high ponytail. She tidied up the room while casually singing in a low, soothing voice:

"Poor Lemonhope, I found you in the dark. You lived in the bathroom, now live in our hearts.

Sweet Lemonhope, freed by hard sacrifice to live in the kingdom of sugar and spice.'

She listened quietly to the lyrics, her eyes growing heavier and heavier... until she stumbled and fell when the princess said, "Who are you and why are you spying on me?" After picking herself up, she opened the door all the way and rubbed the back of her neck. How embarrassing to get caught like that.

"I'm Marceline, your new royal adviser. Didn't they tell you I was here?"

Answering a question with a question should help her avoid the reason they were even talking in the first place. Not that she could really focus on that already. The vampire couldn't stop looking at her heart-shaped face, plump cheeks, and thin lips. Somehow her ear caught the princess answering no. She smirked, leaning against the door frame, arms crossed over her chest.

"That must be awkward not knowing what's going on in your own kingdom," she commented.

The princess pouted adorably and mirrored her arms. "Still doesn't explain why you were watching me earlier." Shit. She remembered. "Uh, I heard you singing and got curious." A dark red blush somehow appeared on her face at the mention of her singing. She tucked her bangs behind her ear, looking down at the ground. "Oh. That. It's a song I made a while ago," she confessed, catching the music lover's attention.

"You write songs?"

"Sometimes. When I'm not busy. Why? Do you?"

"Yeah, I do. Maybe you could show me some of your songs one of these days."

"Hmm." The pink haired teen paused in thought. "Maybe."

Soon the room was quite, releasing a tense vibe as they stood awkwardly, not knowing what to say. It was the younger of the two that broke the silence. "Well, I should probably catch some zzz's. We'll talk more in the morning." Marceline nodded, relieved to be dismissed back to her room, and shut the door. A moment later she cursed herself.

That was the perfect opportunity and it was gone just like that.

Who knew when would be the next time she'd be alone with her. She sighed, changing into pj's and slipping under the cold comforter. 'It'd be a shame to rush this mission anyway,' she convinced herself. 'Good things come with time.' Throwing something at the light switch, she descended into the darkness and her thoughts since she had no physical need to sleep. Unfortunately her thoughts rested on the pink princess she had just encountered.

This was going to be a long night.


Thank you for reading the first chapter of 'I Can't Kill Her'. This will probably be.. 3 chapters? Leave a review of how I'm doing so far!