DISCLAIMER: I do not own Adventure time.

A/N: This is my first fanfic of AT. It would very much appreciated that I could read your reviews on this. Hope you all enjoy this.

The Brave Little Heart

It's 3:52 am in the morning. Finn, the hero of Ooo, and Jake, his adoptive brother, are still in bed. They're so tired because of what happened last night. They had a stake out in the candy kingdom because the other day, hugwolves came in and hugged almost all of the citizens. This is the reason why the two of them are out cold. While the two of them are sound asleep, something's happening in the kitchen. Rumbling noises can be heard from the kitchen but due to Finn and Jake's stake out last night, they are knocked out. Someone or something is in the kitchen. BMO was sleeping on the couch in the living room, after a few minutes she wakes up due an unexpected software update. Her system starts to boot in.

B: "Emergency Startup Sequence initialize. Startup Commencing.", she said during the start of the update of her system.

After a few seconds, the download of the software update began. As she turned around, there was a shadowy figure standing in front of her. Before BMO can say a word, the shadowy figure reached in and pressed the reset button. Buzzing sounds can be heard. Different colors of flashing lights was coming out of the screen then all of the sudden a loud crack was heard. This was the reason for the two heroes to wake up from their sleep.

F: "Jake, wake up. I think I heard something ."

J: "Okay, I'll go down and have a look... *snore*" he said then fell back to sleep.

F: "Jake, come on man. I really heard something."

J: "*Yawns*... Okay Finn."

Finn grabbed a candle beside his bed and he lit it up. Jake stood up but still holding on to his pillow. They went down to check where the loud sound came from. When they got down, they BMO was flashing and buzzing like crazy. Finn approached.

F: "Hey BMO! Stop flashing! BMO!" Finn shouted.

J: "Arrrgh! This has to stop." Jake shouted.

Jake grabbed BMO then he pressed a combination of buttons. After Jake stopped pressing, BMO let out a loud but short beeping sound then the words "REBOOT SEQUENCE" started to show in the screen. Finn had finally calmed down and sat down on the couch next to BMO. Jake was wondering about why was BMO had gone crazy. A bright light suddenly flashed from the screen, that was signal that BMO was done rebooting.

B: "Reboot complete. New software update installed." she said after finishing the update.

F: "Thank Glob BMO you're done." said Finn as he looks at BMO.

B: "Hi Finn. Hi Jake. Why are you awake at this time in the morning?"

F: "We heard something from down here, so Jake and I came down to check. Then we saw you goin' bananas. Jake saved you, I think..."

B: "Oh, thanks Finn and Jake for saving me. But there is a reason why I was like that."

As BMO explained to the two why she was like that, Jake became more confused. Then Jake butted on the explanation.

J: "Wait, wait, wait... Why would you have a software update during this of the day?"

B: "I do not know Jake but I will still be receiving three more software update this day."

J: "Okay but remind us next time when you'll be doing that. It's hard to input the emergency stop code, you know..."

B: "Okay Jake, I will."

F: "Did you see who the guy who did this to you?"

B: "Unfortunately Finn, No. It was too dark for me to see, and my night vision mode update is not yet installed in my system. I can't use it, I need the latest version of it."

F: "Oh, okay BMO." sounding quite disappointed.

J: "Hey BMO, do you still have your heat vision mode?"

B: "No Jake, I removed it so I can install the new version of my night vision mode."

J: "Aw man... Well at least you're okay. I thought you were busted up by that guy you told us."

B: "If that guy want to bust me up, I will use my controller as a rope and tie up the villain."

While the two of them are busy talking to each other, Finn noticed something near the dining table. Some sort of triangular object. It's small and shiny. He came in closer to check it out.

F: "Hey Jake, look at what I found on the floor." he said as he picks up the strange object.

J: "What is it Finn?"

F: "I don't know for sure. It looks like it's a broken part of something."

As Finn examines the strange object, he sees another strange piece on the floor. Jake went to Finn to know what Finn is talking about. When he got to Finn, something appeared in front of him. He could not believe of what he's seeing. A dark figure was floating in front of him. Jake stops and refuses to take another step forward. Two crimson red eyes can be seen, glowing and staring directly at him. He starts to sweat and shake. Then BMO suddenly remembers why she was going crazy. It was because of that dark figure standing in front of Jake. Finn was still busy checking out the pieces of objects he found on the floor. The dark figure came closer to but he was paralyzed so he cannot move away.

J: "Oh man, I can't move and I'm totally scared right now. Finn, please look up." said to himself.

Luckily Finn did looked up and he saw the dark figure, floating in front of them. It came closer to Finn but he can't move because he too was scared. An unknown being is in front of them. Staring at them with two crimson red eyes. It leaned closer and was about to hold Finn then the light from the moon reflected at the dark figure. The light made it possible for the two heroes to see clearly at the dark figure. It was Marceline the Vampire Queen. Finn was in awe. She was wearing a gray sleeveless shirt and gray life pants. Her long raven-colored hair matched what she was wearing. The moonlight reflected at the pale skin of the Vampire Queen, this made her more beautiful.

F: "Woah..."

M: "Hey Finn, you won't mind If I around here, right? "

F: "Yeah..." he said while he was still mesmerized.

M: "Thanks Finn."

Jake on the other hand, fainted after being so scared and saw Marceline at the same time. After a few seconds Finn was back to his old self. She saw Marceline playing with BMO. He then went to her and asked.

F: "Marceline, why are you here?"

M: "I just told you like a couple of seconds ago. I'm gonna hangout here for a while. It's getting kinda boring at my place."

F: "So were you the one who caused BMO to go haywire?"

M: "Yup, I thought it would be fun waking you up from your sleep. You were soo cute when you're asleep." she said as she lets out a small chuckle.

F: "*Blush*... You were watching me sleep!?" he was embarrassed.

M: ''Yup :)."

F: "Fine, you can stay but please be quite when playing with BMO and next time when you come in here, tell us so we can at least prepare."

M: "Okay hero, you got to get some sleep. You look like you haven't slept in ages. ".

F: "Yeah, goodnight Marceline."

M: "Goodnight to you too, Finn."

Finn went back near the table where Jake was lying on the floor. He carried Jake on his back then went up. He lay down Jake back on his bed and he too laid himself on his bed and he quickly entered dreamland. Meanwhile, Marceline stopped playing with BMO. She turned off BMO and went up to where the two heroes of Ooo was sleeping. She sneaked into Finn's bed. The sleeping hero was out cold that he didn't feel the Vampire Queen beside him. She laid down next to Finn. She was staring at Finn while he was sleeping.

M: "Oh, Finn. You're so cute when you're asleep."

She went closer so that she can see Finn's face more clearly. After minutes of staring at his face. Marceline gave Finn a kiss on the cheek and she went to dreamland too.