Disclaimer: I do not own Frozen or ROTG (Rise of The Guardians) and the all the characters used belong to their rightful owner

A/N: Hi! It's Aqua here n.n This is my first Frozen fanfic... actually, this is my first crossover ever! If you are reading this, please know that I actually LOVE this pairing and it would make me so happy if someone could tell me if Elsa is IC or not because I wasn't sure if I would be able to do it.

Please read on!

It was cold. But of course, it was always cold. At least, in the princess' room.

Elsa: next in line, princess of Arendelle was eight-years-old. She sat alone in her desolate bedroom separated from any sort of living thing. With the ever-so slowly freezing icicles forming outside her window frame as her only friends, she was starting to sink deeper and deeper into a pit of depression –and she had convinced herself that this was for the best. The best for the people she loved. Her parents, who may or not have been the ones responsible for her isolation, and her one and only sister, the cause of this whole thing –more or less. Elsa admits less because she knows in her heart it was in fact her fault. It was all her fault.

As this thought dawned on her for the millionth time, frost snuck beneath her fingertips onto the window-sill, causing a shudder to ripple down her spine. She gasped, and quickly pulled her hands away. She jumped off from the velvet cushion she had rested on and scurried over to her door. She sat against it and squeezed her knees to her chest, closing her eyes and telling herself over:

"Conceal it, don't feel it… conceal it, don't feel it…" she slowly rocked back and forth when suddenly, she heard a knock on the door.

The familiar rhythm "shave and a haircut" vibrated into her back bringing her back to her room which was beginning to crawl with frost. She turned around onto her knees and raised her shaking hand to the door to reply "two bits", but then, she heard her sister say the same phrase that lead to her sister losing her memories, and stopped.

"Do you wanna build a snowman?"

Elsa closed her eyes and lowered her hand to her lap trying to keep herself from saying something she would regret.

"Or ride our bikes around the halls…"

Not only her eyes, but she also closed her heart, and didn't dare to listen anymore. She knew her sister missed her and Elsa wanted to play with her too yet, she couldn't let the same mistake happen again. What if… she struck her heart this time? What would she do?

Elsa wrung her hands in her lap and stared at them as if they held some sort of disease –no, that was wrong. It was a curse.

She stood up, still holding her hands and shuffled to the window once again. She stared out across Arendelle's dock and observed the boats that sashayed their sails, and wooden bodies that slid so graciously across the waters. Out of the corner of her eye, she saw frost rapidly sweep across the outside of the window-sill –the type of frost that covered your windshield on cold winter mornings. It appeared to form out of nowhere. In what felt like seconds, the whole window was made into a sheer curtain of ice.

Did I do that? Elsa wondered in fear.

She looked at her fingers and stared at them with unease, but soon her eyes traced back to the window when she noticed something being drawn on the window. A staff was being carved into the ice. It looked mangled and had the shape of a 'G' as the crook. She gazed at it with wonder, and unconsciously grazed it with her fingers, sending an icicle from her fingertips and piercing the glass, shattering it on impact. The little girl screamed and jumped back, but not quick enough to avoid being cut with several shards of glass. Glass lodged itself between her flesh in her left hand and many other places and she screamed again, this time for her parents, and suddenly tears were flooding down her face.

She heard what seemed like thunderous feet slamming into the stairs as her parents ran up to her room and then… blackness.

They crashed through her door, and to their horror their daughter was lying on the ground, unconscious with countless pieces of glass framing her. The bulbs in the light on the ceiling burst when the young princess fainted, and the freezing air that chilled the room seemed to protect anything from catching fire.

The king and queen rushed to their daughter and the king picked her up in her arms, quickly checking for injuries. The only things found were glimmering snowflakes where the king and queen concluded she got wounded, but thankfully to her powers, she was unharmed. Soon enough, the snowflakes vanished and the king and queen were filled with relief.

I'm sorry…

A faint voice could be heard by the young girl in what she claimed her dreams.

After this incident, the king gave her a pair of silk gloves to wear, and told her as he held her hands to "Conceal it, don't feel it."

She already knew this without him telling her, but still, she finished with a dry smile, "Don't let it show."

A/N: If you already know the story I'm just recapping what happens next. The next break-line will be the continuation of the story

Several years later, the king and queen pass away from a dangerous storm out on sea as they traveled to a partnering kingdom leaving Elsa to become Queen of Arendelle and take over for her parents. Many things happened after a short period of time: Elsa and Anna finally meet after years of separation, Anna exclaims she is getting married to which Elsa disagrees to and ends up casting a never-ending winter across Arendelle, Anna falls in love, Elsa becomes free until Anna tells her the danger of what she has done, Elsa pierces Anna's heart with powers sending her to death if she does not find an act of true love, Anna freezes to death, but because she saves her sister out of love she unfreezes and peace is then returned to Arendelle.

Elsa worked on papers while humming a familiar tune to herself in her study.

"Do you wanna build a snoowmaaaan?" Anna poked her head into the room.

Elsa rolled her eyes with a sigh. "Anna-"

The older sister looked up from her papers just as the flamboyant princess made large struts over to her dramatically and placed her balled up fists on her hips. "If you wanted to build a snowman you could've asked, ya know." She leaned over from her waist and looked Elsa in the eye, raising an intent eyebrow.

Elsa laughed behind her hand and gazed at her sister with warm eyes. "I was only humming to myself," she said.

"Oh?"

Anna slumped over in what looked like disappointment in response. Elsa only droned a "mhm" and returned to her papers, shuffling them on the desk and then placing them in a small pile in the corner. She grabbed an envelope from her left and began to open it.

"Then how 'bout-" Anna started, but the queen cut her off with a sharp look, set the envelope on the desk, and tapped her finger on the document. Anna groaned in frustration and Elsa couldn't help but laugh at her adorable sister. "Do you always have to be the queen? Can't you take a little break?" Anna pleaded.

"You know I can't, Anna. Maybe we could-" Elsa began, and Anna didn't have to hear anymore because she knew what she was going to say next.

With an excited yelp she thrust a fist in the air. "Yippee! Snowball fight, the usual room, ten o'clock sharp, you know it." Anna gave her sister a wink and soon dashed out of the room.

Elsa laughed with a small shake of her head and smiled.

It was exactly ten o'clock, the palace quiet with no sound… except for Anna clumsily crashing into a suit of armor. Anna got up quickly and shushed the broken soldier as if it was its fault, and carefully stepped over the pieces, creeping over to the room where Elsa patiently waited for her sister. Once she entered the room, Elsa's eyes suddenly gleamed with excitement and she could tell already by the giant smile on Anna's face that she was excited too.

Anna ran up to her sister and grabbing her hands, she looked into her eyes anxiously, "Do the magic! Do the magic!" She said almost laughing and let go so Elsa could perform her powers which put Anna in awe each time.

Elsa smiled and twisted her hand, gathering her fingers together before shooting a volley of ice from her fingertips into the center of the room which sent a descend of free-falling snow over them. Anna's eyes sparkled as she watched the snow gracefully float down to the ground and danced side to side with her arms outstretched feeling her sister's powers against her skin.

While trying to catch a few of the delicate masterpieces on her tongue, she didn't notice the snow gaining with depth at her feet. Elsa shook her head with a small laugh and with twirl of her hand she cast a pair of boots onto Anna's feet.

"You forgot your boots again." Elsa said, to which Anna replied with a shrug as she turned to her sister who had taken out her hair that was in a stylish bun moments before.

She was now wearing her teal dress which Elsa adored so much since she designed it in her ice kingdom on the North Mountain.

Anna's mouth gaped for a moment. Even after seeing it so many times, I can't get over how gorgeous my sister is in that dress!

Elsa smiled to herself as she fancied her shoes not noticing her sister creeping up behind her with a snowball in hand. Anna counted to three before throwing the snowball, earning a surprised-and-face-full-of-snow-Elsa who turned sharply to glare at her sister. Elsa gave Anna a quick smirk before advancing quickly with no mercy in mind and a conjured snowball in hand.

They played for hours, not caring what the morning had to bring and living in the moment. Though, they were tired, they still played. It'd been a couple weeks since they had this fun and luckily this time, they didn't end up with a water-stained painting like when they had played in the gallery which Anna suggested and Elsa agreeing to thoughtlessly. She earned a head full from Kai the next morning, so thankfully, this time they didn't have to worry about that and could go full out.

After another hour, they really were worn-out and called it a night.

"Anna, you go up before me, I'll clean up." Elsa said, and Anna nodded, leaving her alone in the empty room.

Elsa sighed. She never really liked getting rid of her creations. She liked creating things, and thought this as she regarded a hand-made Olaf, a small snow-castle, and a snow fort she had made to play with Anna during a snowball fight. If she could just leave these here without them melting she could have them forever –she liked the thought of trying out eternal snow. She had figured out something with Olaf, and Marshmallow was up on North Mountain so he had no problem. This reminded her…

"I wonder how Marshmallow's doing," Elsa said quietly.

She was worried that maybe something had happened while she'd been away. Suddenly shaking her head, she told herself that Marshmallow was fine as long as he was on North Mountain so she needn't worry. She needed to focus on the task at hand which was getting this place cleaned up before the servants saw anything. She could already see the Sun daring to peak through the frost covered windows in the room and started to hurry along. She swept her hand out in front of her making the snow fly up to the ceiling and disappearing into the vapour of the air.

It took her less than a minute to get it finished, and once she was done, she smiled at the sparkling floors and breathed out a content sigh. She was about to leave the room when she sensed someone watching her and slowed her pace. She held her hands together and continued for the door, aware of the fear gnawing at the pit of her stomach.

She heard whistling of cold air breathe against the windows of the room and turned to see frost formed on the glass. Elsa had no idea what was going on. Her eyes searched for any other signs of herself in the corners and the pillars of the roof, but there was no indication and so her eyes dropped back down to her hands.

This isn't me. This can't be me… right? Her knees felt weak, so she placed a hand on the door to steady herself. Without intention, a splatter of frost formed from her hand and traveled up the wood to the doorframe, sealing the door shut. As she realized what she had done, more frost edged the darkest of corners and coated the floor.

"Is… is there someone there?" Her voice was choked out from her mouth in a stutter.

More frost ventured toward her, but it was strange. It was almost as if someone was… walking toward her?

A/N: Okay, honestly, I didn't know what to do for my summary so I just stole the last line of this chapter and slapped it in the summary box. Clearly, you know where this is going, but it may take a liiiiitle bit more time before they meet officially. Anyways, thanks for reading.

Disclaimer: I do not own Frozen or ROTG (Rise of The Guardians) and the all the characters used belong to their rightful owner