Ooa-Aaa Adventures

by SparkyWolf

Crossing over the worlds of Ooo and Aaa. What will bro-sis adventure duo, Fionna and Finn do when they notice their magical dog brother, Jake is acting real wierd? And what sciency stuff have the cousins Princess Bubblegum and Prince Gumball been up too? Will it work out to math or will their entire world be put on edge and their lives on the line? I do not own the cover pic.

1. Chapter 1

AN: Hey Guys and Gals. This is my first fan-fic, rated T for violence, honestly I'm not capable of writing the icky romantic stuff. There will be a little of course, it's still Adventure Time!

Chapter One

What's Up With Jake?

"Hey Jake, what's for b-fast bro?" Finn leapt down the ladder leading from the bedroom Jake and he shared into the kitchen. Instead of Jake at the stove he found Cake . "Oh right, mornin' Cake, where's Jake?"

"Off visiting Lady, Finn, why something urgent?"

"Oh, nah. He seems to be spending a lot of time out lately."

"Mid-life crisis, maybe?" Cake suggested with a wink. Finn cracked up laughing, Jake was the most laid-back person he knew, no way something could bother him that much, or at least something he could hide. Was there? His face must have dropped as Cake looked at him oddly. "You sure you ok, Finn, you look a little off, here have a bacon pancake." Finn assured Cake he was fine, and resolved to tell Fionna about his concerns when he could get her alone.

"And just where are you two off to?" Cake asked suspiciously as the two humans ran to the door, all geared up for an adventure. "Adventuring!" Fionna cried enthusiastically. Finn grinned at the cat. "Without me?" Cake looked hurt and Fionna opened her mouth to speak but Finn cut her off. "Why don't you go visit Mochro? We rarely get to go adventuring, just the two of us." He added some pouting for extra effect. Cake brightened up, "Sure then, just be careful, babies, enjoy your bro-sis time." Fionna shot Finn a puzzled look but only said a quick "Sure, see ya." To Cake. As the two left the tree house Fionna rounded on Finn. "Pfft bro-sis time my butt, Finn, what's this about?"

"Have you noticed Jake actin' weird these past few days?" He said in a rush. Fionna opened her mouth to object, but something made her stop and think. "Yeah, I suppose, what do you think could be up?" She asked.

"Dunno, that's what we're gonna find out today." Fionna hated seeing her little brother upset, and she did want to make sure Jake was ok. She grinned, "so, what time is it?"

A wide smile split across the human boy's face, he made to 'okay' gestures on his hand and held them upside down against his eyes, making him look like he was wearing two strange monocles. "Spy time!"

AN: So, what did you think? Please review and tell me honestly, constructive criticism is appreciated, but please don't abuse, it's not math. Thank you so much for reading,

SparkyWolf