Marceline's Little Sister

Summary:On a random evening, Marceline drops her little sister off at Finn and Jake's tree house. She asks them to watch over her, and leaves. Realizing that Merry isn't very fun and active, they decide to take her on wild adventures. What happens when Marceline comes back to a new cheerful, adventure-loving little sister?

Merry and PB-

The three made their way to the Candy Kingdom, where they were greeted by the residents.

"Finn! Finn! FINN! "Princess Bubblegum's voice called out. She was running towards them, waving a wad of paper in the air.

"What's up PB?"Finn asked as he jumped off of Jake.

"I've created a perfect potion to cure people's fears! All they have to do is have a drop of this potion, and they'll be cured for good!"she exclaimed happily. "Unfortunately, I don't know if it's stable yet, because I tried it on a few candy people, and it worked for a second or two, but then it started to wear off. I made a new one though, so I need to test it out."

"Oh my glob! That's awesome PB! Oh, there's someone I want you to meet! Merry! Come down here!"Finn called. Merry looked over Jake and saw Princess Bubblegum and Finn, but didn't jump down.

"Well, I'm waiting."Merry said, tapping her finger on Jake impatiently.

"Waiting for what?"Finn asked, raising an eyebrow.

"Waiting for you to help me down you numbnuts!"Merry growled.

"Can't you just fly down here?"Princess Bubblegum asked, with Finn nodding in agreement.

"N-no! I can't!"Merry retorted, causing Finn to flinch.

"Why not?"Jake asked.

"BECAUSE! I'M AFRAID OF HEIGHTS!"Merry confessed angrily, causing her to fall over, and unfortunately for her, Jake was extra large today.

"Finn! Do something!"Princess Bubblegum cried, and Finn jumped into action. He jumped into the air as high as he could, and caught Merry bridal style.

"You okay Mer-Mer?"Finn asked, holding her close to his face. She blushed and turned her face away.

"I'm fine! J-just let me down..."she muttered, and so Finn did as told.

"I didn't know you had a fear of heights Mer-Mer."Jake said, shrinking down to his normal size.

"W-well now you do... Marceline always makes fun of me because of that."Merry sighed, kicking some dirt.

"A fear of heights you say? Hmm. Merry, would you mind testing out this potion? It could help you get rid of your fear of heights, if you just try it!"Princess Bubblegum pleaded.

"Will it really help?"Merry asked, a bit interested.

"I'm not sure, but let's test it out, okay?"Princess Bubblegum suggested, and started walking into the castle. Finn, Merry, and Jake followed behind her, as she went up endless flights of stairs, until they reached the highest part of the castle.

"W-why are we here?"Merry asked, frightened. She clung to Finn, who blushed a little.

"Because, we're testing the potion of course. Once you drink this, attempt to jump off here and fly."Bubblegum answered.

"F-fine... B-but if something bad happens, I-I won't forgive you!"Merry warned. She snatched the potion from Bubblegum and took a deep breath. She ran from her spot and jumped off the edge of the castle. She started to float in the air.

"Hey! You're doing it Mer-Mer!"Finn exclaimed. "Shake that booty!"he laughed, and was hit by a shoe.

"S-shut up!"Merry blushed. She clutched her parasol tightly, and smiled. She was doing it! She was flying! She was- "AHHHH!"she screamed. The potion wore off again, and sent her falling at high speeds, faster than my internet.

"Merry!"Finn shouted, jumping after her. Merry was crying, trying to hold on for dear life, but instead, something or someone was holding her.

"Finn?"she squealed as she opened her eyes. Seeing him, she blushed.

"You know it! Jake! Now!"Finn shouted. Jake stretched his arms all the way to the ground, and enlarged his hands, which caught both Finn and Merry.

"I'm so sorry Merry! I thought it would work for sure this time!"Bubblegum apologized, as Finn let Merry down.

"It's fine... I'm just glad Finn caught me in time."Merry sighed. "What was even in that potion?"

"Ah, well... Let's see... Cotton candy from the Cotton Candy Forest, fear-me-not flower extract, aged ice from the Ice Kingdom, and... Ah, that's right, I added some of Finn's hair! He is fearless after all."Princess Bubblegum said, reading the ingredients off of her clipboard.

"Well no wonder it didn't work. You didn't add the tears from the Lake of Sorrow!"Merry scolded, shaking her head, causing Bubblegum to blush.

"I-I see, would you mind assisting me to remake the potion?"Bubblegum asked politely. Merry look at Finn, who nodded, and sighed.

"Very well, let's go."she said, and they went to Bubblegum's lab.

"Oh my glob PB! This place is a mess!"Finn exclaimed. Princess Bubblegum's lab was a complete disaster, probably meaning she's been working on the potion whenever she had the chance, and not bothering to clean up.

"Yeah, I haven't had time to clean up, but we have to get started!"she stated, already pouring and mixing. "The tears! I don't have any!"

"But I do. Here."Merry smiled, taking out a vile full of tears from the Lake of Sorrow. She pulled out the cork and dropped 1 tear, and put the rest back in her pocket. She began to mix it thoroughly and slowly, and the color of the potion in the cauldron turned from pink, to purple.

"Amazing! You're awfully intelligent for a 12 year old Merry."Princess Bubblegum complimented.

"Yeah, I do a lot of reading, researching, and other stuff like that. See Finn, reading can help on adventures."Merry nagged, sticking her tongue out.

"Well, you're welcome to come here any time Merry. Especially during the science fest!"Bubblegum offered, and Merry nodded.

"Hey Finn, I'm getting kind of bored, can we go somewhere else?"Merry asked, twirling her parasol around.

"Sure thing Mer-Mer."Finn agreed. "Jake! To the Ice Kingdom!"he announced, and picked Merry up bridal style, causing her to turn red. Jake enlarged, and Finn jumped on him. "I bid you good day PB!"he said, and Jake started on his way towards the Ice Kingdom.

Mer-Mer... Hehe.. I, in my opinion, dislike this chapter... Too much blushing.. My little cousin actually thought of this plot, and he's only 6... Well, it's not that I don't like it, just, as I stated before, too much blushing... Anyways, thanks for reading, please review. I'll also take any suggestions for future chapters, but they all have to fit into the one week plan.