Adventure Time in: Fire in Their Hearts
Chapter 1: The Rise of Heroes

Disclaimer: I do not own any characters of Adventure Time except: Frey, Sol, Gerda, Jake Jr., Leonard, Sin-ang and the name Sunna for Flame Princess.

This is the sequal to 'Fire in your Heart' if you have never read the story then go to my profile so that you'll understand easily.

Finn and Sunna are 21 years old.

6 years later.

At the treehouse there were two children who were sneaking into their parents room, one is a boy who has short blonde hair, blue eyes, a ruby on his forehead (Similar to Flame Princess but smaller size), and yellow-orange skin name. The other is a girl who has long red hair, yellow eyes, and white skin, their name is Frey and Sol.

The twins were excited because today is their birthday and they get to learn on how to conjure fire. Frey and Sol were at the edge of the bed where Finn and Sunna were sleeping at. "Lets wake up mom and dad" Sol said.

"Okay"

The twins yelled. "Morning mom and dad!"

Finn woked up and smiled. "Morning kids" Finn said wiping the sleep off of his eyes. Sunna was still asleep but she woke up when Finn shook her. She open one eye to see Frey and Sol close to her face. "Can we learn how to conjure fire please pretty please" Sol said.

Sunna laughed, "Okay I guess I can teach yall on how to conjure fire after all today is your birthday" Sunna said smiling. "Yay!" The twins said in unison jumping up and down filled with excitement.

"But you got ten seconds to get outside or no magic today" she said and they ran outside. Finn chuckled cuddling up with Sunna and said. "Don't you think that they can conjure fire at that age?"

Sunna glanced at him. "I conjured fire when I was 4 years old so I don't think theres any harm of doing it" Sunna responded kissing her husband before she got out of the bed.

Later Sunna was outside sitting on the grass in meditation position while Frey and Sol did the same. "Now to conjure fire, bring out both of your hands and think of something warm or hot" Sunna said, she closed her eyes and a fireball appeared on her hands, the twins gasped.

"Now remember when you conjure fire it is part of you, if its put out it can harm you which is dangerous" Sunna warned.

They both closed their eyes imagining something warm in their minds.

In Frey's mind he was thinking of the sun's great warmth then all of sudden fire appeared in his hands. "This is so cool" he said staring at it amazed.

Sol on the other hand was struggling to conjure it and her brother laughed. "Ha ha you can't conjure fire like me" Frey said picking on her. Sol grew angry and a fireball appeared making Frey move away from her.

"Hey sis your not thinking on aiming it at me are you?" Frey said. she smirked, "Thats sounds like something I would do" Sol said.

"Don't even think about it" Sunna said trying to calm her down but Frey grew nervous and thought of a crazy idea, he created wings made out of fire and began to fly away. "Woo hoo" Frey said as he was flying in the clouds then all of sudden he lost control of his fire ability and started falling in mid air. "Holy Gloooobbbb" Frey landed on snow with his face buried in it at the Ice Kingdom.

"Are you okay?" a female said, he looked up and blushed seeing a girl around his age, the girl has long white hair that meets down to her shoulders, light bluish skin and beautiful green eyes. The girl wears a blue dress and has a tiara on her head, she also has a penguin sitting on her lap. "Im-im fine who are you?" Frey asked.

The girl smiled. "Im Princess Gerda, daughter of King Simon and Queen Betty, heir to the Ice Kingdom you?"

"Im Frey, son of Finn and Sunna and heir to the Fire Kingdom" Frey replied still blushing.

Gerda giggled softly seeing his cheeks bright red. "Your father is Finn the Hero? I've heard countless stories about him is it true that your father used to be the enemy of my father?" Frey nodded as he got up slowly.

"So how did you get here?" Gerda asked full of curiousity.

"Well today is me and my sister's birthday and we was learning to conjure fire, my sister wasn't strong enough to conjure it and I was picking on her making her angry, so I use fire as wings and I flew in the air like a bird till I lose control of it and landed here" Frey explained sitting on the snow beside the princess, "So what can you conjure?" Frey asked.

"I conjure ice like my father, he told me that the crown he wears granted him these powers, he said that his blood that runs in my veins granted me these powers. But its too powerful for me to control so my father created a crown that'll allow me to control it easier" Gerda said.

"You can summon ice?" Gerda nodded and she grabbed Frey's hand to the snow. "Come on help me make a snowman and I'll show you."

Frey build a large pile of snow for the bottom part of the snow man as Gerda was making the middle part. Frey and Gerda both made the head and put it above the snow man.

Then Gerda rub her hands together and she place her hand on its chest and made the snow man come alive. The snow man looked around and was trying to speak but it didn't have a mouth. "Wow that is so cool Gerda" Frey said.

"Can you show me your fire ability Frey?" Gerda asked staring at his blue eyes. Frey went into thinking, he closed his eyes and summoned a flower that is made out of fire. Gerda awed at what Frey did.

"Thats neat Frey, so you having a birthday party?" Frey nodded. "Yeah you can come by if you want to."

Gerda smiled, "Of course I do I'll-."

"Frey oh Frey where are you?" Sunna yelled looking for him. "Coming mom, I gotta go" Frey walked away as Gerda headed back to the castle.

Frey see his mother and father holding Sol's hand. "Are you okay Frey?" Sunna said trying to see if there is any bruises on him. "Im fine mom but I met a friend today."

"Oh and whos your new friend?"

"A princess name Gerda" Frey said as his cheeks went red again thinking about her. Finn lifted his son up in the air and said. "Something tells me that you have a crush on the princess."

"Dad!" Frey groaned as his whole face turned red feeling embarassed.

Finn laughed putting Frey down. "Daddy im bored of conjuring fire can you teach me new moves of combat like you taught us last week?" Sol said.

Sunna and Finn both stared at each other and smiled. "Sure Sol if your strong enough to take on your old man" Finn joked.

Sol smiled. "Im alot stronger than you daddy" she said, Finn put his hand on her head when she was throwing punches at him. "Thats not fair daddy!" Sol complained.

"Okay okay fun times over lets head back home" Sunna said, Finn picked up Sol letting her ride on his neck while they were heading back to the treehouse.

In the next chapter, Finn and Jake's kids will start their quest not knowing what trials they have to complete. Also happy birthday DubbleDuelSword :)