A/N: Hey everyone! Here's the next chapter of Love Will Thaw!

Disclaimer: I don't own Frozen or Rise of the Guardians.

Frozen Heart

Jack Frost zoomed across the sky in the spring of Arendelle eight years later. He was on his way up to the frozen mountain lakes where ice harvesters did their work. A young boy followed them around and he was always good for a snowball fight. He glanced down and saw the castle and grinned. He wondered how that little princess was doing.

So he glided down to the castle and saw a five year old girl with strawberry blonde hair gazing out the window. He grinned and waved at her. Her blue eyes widened and she waved back enthusiastically. Then she went away from the window. Jack floated down and let himself in. The little girl stared at him with an open mouth. He chuckled. "Hello. My name's Jack. What's yours?"

The little girl's mouth closed with an audible snap as she whispered, "I'm Anna! I'm a princess! Are you a fairy?"

He rolled his eyes: if only Tooth had heard that. "No I'm Jack Frost. I'm a Guardian."

"What's a guardian? And what are you guarding?"

He laughed. "You ask a lot of questions Anna. I'm the Guardian of Fun. When I'm around, children have all kinds of fun things to do."

Her ocean blue eye, so like her sister's, widened. "Like what?"

Jack grinned. "Like this!" He pressed his palm against the window and ice spread from his hand. Anna gasped in delight. "My sister Elsa can do that too!"

Jack's grin got even wider. "You don't say? Well why don't you wake up Elsa and we can all go play?"

Anna gasped in delight and scrambled onto her sister's bed. "Elsa! Come play with me!"

The older princess yawned. "Go back to sleep Anna…"

"I can't! The sky's awake, so I'm awake, so we have to play! There's even someone who wants to play with us."

"Then go play with him…" Anna frowned in protest but Jack put a hand on her shoulder. "Don't worry about it Anna. You and I can have a snowball fight without Elsa. Maybe we'll even build a snowman!" Elsa sat up at the words snow and man in the same sentence but she hesitated when she saw the strange boy in her room. "Who're you?"

"Aww Princess Elsa! Don't you remember me?" He flew in closer and kissed her nose. "I'm Jack Frost and I'm nipping at your nose!" Elsa giggled and hugged him. Jack picked her up and scooped Anna up in the other. "So. Where do you two go to have fun around here?"

He whistled and his staff appeared under his feet. The girls gave excited giggles as they raced down the hall.

"The ballroom! The ballroom!" Anna cried out and Elsa said, "Shh! Anna, don't wake up Mama and Papa!"

"Yeah," joked Jack. "Then we can't play! Adults don't know how to play with me!"

Anna giggled again as they opened the doors to the gigantic ballroom and squealed, "Do the magic, do the magic!"

"Okay," said Elsa as she waved one of her hands over the other in a circular motion. Jack watched as the older princess made a snowball and he laughed. "Wow Elsa you're pretty good. Why don't you show me what else you can do?"

Elsa grinned at his praise. "Watch this!" She stomped and ice spread out from her to cover the floor from wall to wall. Anna did a little jig of happiness, almost falling before Jack scooped her up with his staff. "Careful Anna. Don't want you to fall."

She giggled and let Jack and Elsa swing her around the ice for a bit. Jack then showed Elsa how to coat parts of the floor with snow and joined them in making a snowman. He swung Anna around a few times and plopped her in the throne. Elsa turned their little snowman around and said in a funny voice, "Hi, I'm Olaf! And I like warm hugs!"

Anna giggled in delight, before it turned into hysterical laughter as Jack walked up and swept into a grandiose bow. "Delighted to meet you old chap," he said and Elsa joined her sister in her laughter before running up to Jack and leaping into his arms. "I love you Jack!"

Jack's heart warmed a little as he hugged the platinum blonde princess back. "I love you too Elsa."

"Hey! What about me?!" He grinned and scooped Anna up as well. "How could I forget you Anna? Of course I love you too!"

Anna cheered and jumped out of Jack's arms. "Let's keep playing." He smiled and shook his head. "Nah I have to go now girls. I've got a little boy up in the mountains who's waiting for a playmate too."

The girls let out sighs and Jack smiled. "Aww don't stop having fun just because I'm leaving! Here, I'll make you guys a sledding hill." The girls squealed happily and climbed to the top of Jack's brand new snow mountain. He waved to the girl's before surfing up to the windows. He let himself out and was about to leave when he heard Elsa scream, "Anna!"

He turned back just in time to see Elsa desperately try to catch her sister, but her magic struck the younger princess in the head. Jack dove for the little girl and caught her before she hit the girl as Elsa ran over sobbing. "Anna! Anna, wake up!"

Jack held the two sisters close as Elsa pulled Anna into her arms. "Anna!"

"Elsa you have to listen to me."

"I'm sorry I didn't mean too!" His eyes softened as he stroked her hair. "I know, my little snow queen. But Anna needs help, so you have to be brave."

She nodded through her tears. "Mama! Papa! Help!"

Jack could hear her parents coming, so he quickly hugged the two sisters and kissed Elsa on the head. "Elsa your parents aren't going to be able to see me okay? I'll be invisible to them." She looked up at him with frightened eyes. "Don't worry I'll still be here."

She nodded and said to her sister, "It's okay Anna. I got you." The doors slammed open and the king and queen came rushing in. "Oh no, Elsa what have you done? This is getting out of hand."

"It was an accident! I'm sorry Anna," she cried again and Jack squeezed her shoulder.

"She's ice cold," said the queen. Her voice wavered in fear and Elsa cried even harder. Jack leaned over Elsa to whisper in the king's ear. "Hey go to the trolls."

Elsa glanced up at him confused and scared, but then the king said, "I know where we have to go."

Jack floated behind Elsa just long enough to whisper, "Don't worry Elsa, I'm gonna fix this."

By the time she turned around, the Guardian was gone. Jack raced through the mountains ahead of the royal family zooming past a young boy and his reindeer. "Can't talk right now kid! Keep playing with your friend!"

He skidded to a halt in the trolls' steamy home, ignoring his discomfort. "Hey trolls! I need your help!"

They all came rolling up to him, all talking at once, before one voice shouted, "Let me through! Let me through to see the Guardian!"

Pabbie rolled up and squinted at Jack. "You're not the Guardian I usually deal with. Where's Bunnymund?"

"He's busy getting ready for Easter. I came for your help. In a few minutes the royal family is going to come here; one of the princesses is hurt. You have to help them please!"

He would've explained more but the thundering of hooves was getting closer. One of the trolls yelled, "Quick act natural!"

And just like that they were all stones again. Jack looked on nervously as the king and his family huddled close. He offered Elsa a comforting smile and she just looked up at him, too scared for her sister to even smile back.

"Please, help! It's… my daughter!" Jack watched as they all came up and gasped at what he had already told them. Trolls take a while to impress a point, but I mean c'mon, he'd just said that the royal family was on its way. He glanced up and saw the little blonde boy from the fjords and his reindeer. He shook his head; he wasn't worried about him, the trolls loved children. He'd be fine. He was far more worried about Anna and Elsa.

Pabbie waddled up and took Elsa's hand. "Your Majesty… born with the powers or cursed?"

"Born, and their getting stronger."

"Um not entirely true Pabbie. The Man in the Moon told me to give her some of my power. She was a baby and dying, so I… well I helped. But yeah they are getting stronger." Pabbie nodded to show he understood both Jack and the king before motioning to the queen, who knelt to show him Anna. Jack saw that a lock of her hair had turned the same icy white as his.

"You were lucky it wasn't her heart. The heart is not so easily changed. But the head can be persuaded."

"Do what you must," urged the king and Pabbie placed a hand on Anna's head and pulled out her memories. "I recommend we remove all magic, even memories of magic, to be safe."

"What about the fun? Can't she at least keep the fun?" Jack asked quickly, seeing Elsa's stricken face as Pabbie began changing memories.

"Don't worry: I'll leave the fun." He replaced the memories in Anna's head. "She will be okay."

"But she won't remember I have powers?" Elsa asked timidly.

"It's for the best," her father said gently. "Listen to me Elsa," said Pabbie taking her hand. "Your power will only grow." Blue lights glowed in the sky and showed a woman casting ice magic. "There is great beauty in it but also great danger." Elsa gasped as the lights turned red. "You must learn to control it. Fear will be your enemy!" Elsa screamed as the lights turned in on the image of the woman, destroying her and she hid her face in her father's chest. "No," he said holding his daughter. "We'll protect her. She can learn to control it, I'm sure."

Jack listened to their plans to keep as many people as possible safe while Elsa tried to learn control and he looked down at Anna sadly. Pabbie had erased all magic, including her memories of him, though her parents hadn't seen him even there.

He followed them back and hid out in Elsa's new room until everyone had left. Jack floated down to sit next to the scared princess on her bed. "Elsa? Are you going to be okay?"

She sniffled and clung to his sweatshirt. "Jack what am I going to do? I'm all alone now. Anna and I can't play or I'll hurt her. You can't even play with her cause you're magic!"

"It's all right Elsa. Anna's a happy little girl. I don't have to use magic to get her to have fun by herself." He paused and shifted her to his lap. "It's you I'm worried about."

Elsa shivered. "I can't control it Jack… I'm scared." Jack hugged her tightly. "Don't worry Elsa. I'll be here. I'm not gonna leave you alone."

Not even when you forget I was here.

A/N: That's the first chapter! How'd you like it? Review!