Hey guys! I haven't written a fan-fiction since high school so please be gentle? Again, sorry about the horrible summary. Reviews are appreciated! This fan-fiction is based off my artwork "The Last Adventure" on . Because I got so many positive reviews on it, I decided to go ahead and turn it into a fan-fiction (with side pictures along the way).

Anyways, enough of my blabbering! I hope you enjoy! (Last note: sorry if it kind of starts off a bit slow. I promise the story will pick up!)

(Disclaimer: I do not own Adventure Time nor do I take credit for any of the characters' designing/names)

CHAPTER ONE

"Fionna! Are you awake?"

Fionna mumbled in her sleep and turned to her side.

"Fionna?" A familiar voice called.

Fionna grumbled and unconsciously poked her head up.

"Girl, I am not going to say it again!" The voice called once more while accompanied by the light pitter-pattering of kitty paws.

"Gruuagh?" Fionna answered half asleep.

"Fionna!" Cake exclaimed in disbelief; her eyebrows furrowed in disapproval at the site of her dozing sister buried beneath a pile of fur blankets.

"Honey, it is three in the afternoon, and you're still in bed!" The cat stated in a matter of fact way.

"Wha?" Fionna groaned in grogginess while looking on with a shuttered gaze.

"Three in the afternoon?"

"That's right," Cake grumpily replied while placing her paws on her hips.

Fionna groaned again and sunk back down under the covers.

"Oh no you don't!"

Without warning, Cake snatched the edge of the covers and whipped them away.

"Hey!" Fionna yelled in retaliation. The rush of the room's cold air caused her to shiver and she instinctively curled up into a ball.

"Come on you lazy bump on a log," the cat ordered with a hiss," you are not staying in bed all day!"

Cake's tail bristled slightly as she waited for Fionna to get up and chase after her. But much to the cat's surprise, Fionna instead turned to her side and faced the opposite direction silently.

With a look of concern, Cake quietly dropped the bed covers and stretched over to the other side of the bed.

"Baby, are you okay?" She asked while gently nudging Fionna's shoulder with her paw.

Hearing the worry in Cake's voice, Fionna looked up and let out a sigh.

"Yeah," The young adventuress replied," everything's fine."

Cake's eye lids drooped and she shot Fionna a skeptical look.

"That doesn't sound very convincing to me," Her sister pointed out sassily.

"I said everything's fine," Fionna repeated with a huff.

Trying her best to avoid the cat's suspicious glare, the girl clambered off the bed and began to make her way towards the dresser on the other side of the room. The young adventuress felt a pang of annoyance brisk through her when she noticed that Cake was hot on her trail.

"Fionna, why don't you just tell me what's wrong?" Cake asked.

Fionna, who was busy rummaging around in the drawers for a clean pair of clothes, answered with a small shrug.

"You can tell me," Cake prodded playfully as she extended her arms and started to poke her sister in the side repetitively," Come onnn…"

Fionna puffed out her cheeks stubbornly.

"Come onnnn…"

"Come onnnnn…"

After she finally found what she was looking for, the teenager kicked the drawers shut and turned to Cake.

"How come Prince Gumball doesn't like me?"

Fionna's face flushed and she unconsciously drew the clothes in her arms close to her chest.

A familiar, yet sickening feeling was churning in the adventuress' stomach, and although she had encountered this feeling before, it was still just as painful as the last time. This perverse sensation made her feel queasy, tired, and mad all at the same time. With all of these emotions stirring inside, Fionna could not help but feel slightly overwhelmed, and she struggled to keep back the tears that flooded her eyes.

"Oh glob, don't cry, don't cry," She thought in panic as her eyes began to sting.

Fionna hated the way she was acting right now. She never acted like this! She was acting like…like…like such a girl!

Cake, who was totally lost and had no idea what her sister was talking about, hesitated before replying.

"What are you talking about," The cat asked with narrowed eyes," where on earth did you hear that?"

Waiting for an answer, Cake crossed her arms in an intimidating way…well…kind of intimidating way. If anything, Fionna thought the "threatening" stance was absolutely adorable.

"Pfft…"

Fionna quickly smashed her hand to her mouth, her cheeks growing red as she did her best to smother her laughter.

Hearing Fionna's stifled giggles, Cake's tail bristled and her frown deepened.

"Fionna," The cat yowled while shape-shifting into a larger form," I'm being serious!"

Fionna waved her hands disarmingly and replied admittedly," I'm sorry! You're right, you're right…"

Cake, who had almost touched the roof of the tree house with her enlarged form, shrank back down to normal size. Placing her paws on her hips, Cake was anything but amused.

"Don't be mad at me, Cakey," Fionna remarked as she walked over to make amends with her best friend," I couldn't help it, you're so cute!"

"Well…it's okay," the cat began as she and her sister hugged," I guess I am pretty cute, huh?"

Fionna smiled and for a moment she was happy….that is….until Cake once again lived up to her reputation for being the nosiest cat in all of Aaa.

"Now tell me why you think Gumball doesn't like you," Cake ordered.

Fionna felt the "sick" feeling return and her whole being seemed to wilt in response.

Ever since last night, the adventuress had been trying her hardest to forget about Gumball's hurtful words. The words were seared into her mind and they plucked and pulled at her heart strings, and no matter how hard she tried to forget, they would somehow crawl their way back into her thoughts.

Mentally, Fionna kicked herself for being so stupid! None of this would have happened if she hadn't eavesdropped on Gumball and Peppermint Maid's conversation…

(flashback)

Fionna was riding on a giant Cake, her veins still pumping with adrenaline as she thrust her sword to the night sky and let out a small victory howl. Covered with a fresh coat of slimy ogre guts, the girl laughed and could hardly contain her excitement.

"That was awesome!" She yelled in glee.

Cake, who too was covered in horrible green slime, rolled her eyes and let out a grumpy "humph".

"Speak for yourself," The cat replied bitterly as she carried them over the country-side with her giant strides.

"This crazy green goo is driving me crazy. Gumball owes us big time for this one!"

"Don't worry, Cake," Fionna replied happily," As soon as I'm done talking to PG, we'll go home. I promise I won't be long."

After hearing the Adventuress' reply, a mischievous grin slid across the cat's muzzle.

Fionna felt a blush creep into her cheeks as she noticed the smug look on Cake's face.

"Honey," The cat purred slyly," you take all the time you need…I understand."

Fionna's cheeks flamed as she turned beet red.

"Cake!" She complained in embarrassment.

Cake laughed at the girl's reaction and replied smoothly," Oh stop, Fionna. You know that I was just playing."

Fionna, who was still flustered by Cake's teasing, shot the cat an irritated look and huffed," It's not like that…."

Before continuing on with her sentence, Fionna's expression became sheepish and she twiddled her thumbs nervously.

"Gumball and I are just friends…."

With an unreadable expression, Cake observed Fionna's actions silently.

"Honey," The cat began, her voice soft and caring," why don't you just talk to Gumball and tell him how you feel? I'm sure he will listen."

Fionna bit her lip and pulled on one of her hat's bunny ears self-consciously.

"But…"She hesitated, feeling the fluttering of butterflies in her stomach," but what if he doesn't feel the same?"

"Well, you won't know until you ask," The cat replied.

Fionna grew quiet and the fluttering in her stomach intensified.

Cake was right. Even though she was scared that the answer was "no", Fionna knew that the only way to find out if Gumball liked her would be to ask the prince himself. The only problem was plucking up the courage to do so. If the adventuress had to pick a choice between fighting a dragon and asking Gumball how he felt about her, she would pick the dragon any day! Fionna was inexperienced and clueless when it came to romantic stuff and felt helpless in this kind of situation…and if there was one thing Fionna hated, she hated the feeling of being helpless.

Fionna snapped from her thoughts as they finally arrived at the Candy Kingdom. With only a few more strides, they were at Prince Gumball's castle, and Fionna hopped off Cake onto the castle balcony. Much to the adventuress' surprise, however, Cake did not join her.

Confused, Fionna leaned over the railing and spotted Cake below on the grassy ground.

The cat waved to her sister and winked.

"Oh, Cake…" Fionna groaned in misery.

Reluctantly, the girl stepped back from the railing and nervously proceeded towards the doorway.

Fionna reached for the door handle and gulped.

"It's either now or never…" She thought to herself in dread.

Before Fionna pulled down on the handle, she paused and listened. She could hear voices coming from behind the door. Almost instantly, she recognized that they belonged to Prince Gumball and Peppermint Maid.

"Have all the preparations been made?" Gumball chimed in his normal cheery tone.

Fionna felt her cheeks grow red as she heard his voice and she fidgeted nervously.

"Yes, sir," Peppermint Maid replied curtly," all I need now are names for the invitation list."

"Excellent," The prince replied enthusiastically," this will be the greatest ball yet!"

Fionna was puzzled by this information. She didn't recall PG ever telling her that there was going to be a ball. Maybe it was a spur of the moment thing?

The adventuress pressed her head to the door and listened, curiosity overshadowing the guilt of eavesdropping.

"I'll go ahead and start on the invitation list," Peppermint Maid stated promptly," I assume you want me to go ahead and start off with Fionna the Human?"

There was a pause.

"No," Prince Gumball replied, the emotion in his voice unreadable.

Fionna felt as though her heart had stopped.

"Sir?" Peppermint Maid questioned in surprise.

"No," Prince Gumball repeated, his voice cheery as ever," only Cake."

Fionna had heard enough. She didn't want to hear anymore. The cheeriness in his voice only added to insult and the adventuress felt as though someone had taken a giant boulder and crushed her with it.

Not wanting to return to Cake in such a disassembled form, the girl slumped to the balcony floor and drew her knees to her chest. Although she certainly wanted to cry, she fought back the urge to do so and instead grit her teeth in rage.

"That lousy, no good, low down, pinky pink, pink…," she mumbled incoherent words to herself, trying to calm the rage that began to boil inside her stomach," after all I've done? Go ahead and have your lame ball, I bet it will be sooo lame….I bet it will be as lame as your baking…"

After rattling out all the insults she could think of, Fionna drew in a deep breath and exhaled. She sat there silently and stared at the door.

A part of her wished she had never eavesdropped…while another part seemed pleased with the fact that she finally got the answer she had been looking for.

Noticing her face grow warm and her vision become blurry, Fionna wiped away her tears with her sleeve and stood up.

After collecting her cool, and feeling as though she had her emotions under control, the adventuress leaned over the balcony railing and motioned for Cake.

Cake, who had been waiting patiently on the ground, noticed her sister and shape-shifted into her large cat form.

Without a word, Fionna leapt from the balcony onto her friend's back and held on as they both began their journey back to the tree house.

The majority of the walk home was made in awkward silence and Cake couldn't help but notice that her sister was acting very strangely.

"So what did Prince Gumball say?" The cat asked suddenly.

Fionna was caught off guard by Cake's question and nearly fell off the cat's back.

After gathering her wits, the adventuress raked her brain desperately to try and think of what she should say. She obviously didn't want to tell Cake what Gumball had said...Fionna could very well see her sister going off the deep end and making a quick u-turn to go back to Candy Kingdom to give PG a piece of her mind…and that would be so embarrassing!

"Um…"She hesitated, feeling guilty for what she was about to do.

"Well...Gumball was asleep."

She lied.

"Asleep?" Cake asked in confusion.

"Yeah," Fionna replied trying to sound confident," He was asleep. I didn't get a chance to ask him."

Cake grew quiet.

"Are you sure he was asleep?" The cat asked, her question lined with skepticism," I could have sworn I saw the lights on…"

Fionna didn't answer. Too nervous to say anything, she remained silent.

"Then again…" Cake added, the suspicion in her voice dying down," we are talking about Gumball here. Poor fool's probably too scared to sleep in the dark…I wouldn't be surprised if he did sleep with the lights on."

Fionna mentally sighed in relief.

Although she felt bad about lying to Cake…it would've been even worse if she had told her the truth.

Feeling suddenly tired, the adventuress let out a loud yawn and sunk down into Cake's back. The cat's soft fur was comforting…and oddly, so was the kitty cat smell that clung to it.

Fionna's eyes drooped as she stared at the passing landscape.

Sleep felt like such a good thing right now... Anything would probably feel better than this sick feeling that was churning unpleasantly in her stomach.

"No…"

A cheery Gumball's voice echoed in the girl's mind as she unknowingly drifted off to sleep.

Little did the Adventuress know….

Someone had been watching her.

Nestled high in a tree and hidden by the shadows, a dark figure quietly watched the adventuring duo arrive at the tree house.

Marshall Lee's face was emotionless as he plucked a guitar string thoughtfully, his red eyes focused on Fionna.

Snickering, the vampire king set aside his guitar and folded his arms behind his head. Slowly, an arrogant grin wisped across his pale lips.

"I guess he wasn't prince charming after all…" He remarked coolly, his eyes still concentrated on the adventuress.

However, as the scene of Fionna huddled on the balcony floor came back to haunt him, the arrogant smile on Marshall Lee's face slowly disappeared.

He remembered the hurt expression she wore as she tried to make sense of whatever Gumball had said…and for some reason…it had bothered him to see her like that…and at the same time…it annoyed him.

He didn't understand why Fionna was so obsessed with Gumball. It was like a never ending goose chase with that guy.

Marshall Lee's thoughts were interrupted as a light in the horizon caught his eye. Letting out a puff of air, he lurched to his feet and grabbed his guitar.

"Morning already, huh?" He scoffed bitterly.

Feeling tired from his night out, he floated sluggishly off the tree branch and towards the direction of his home. The vampire king looked over his shoulder at the tree house and smirked inwardly, chuckling to himself mischievously before picking up speed.

"See yah tonight, Fi."