OKAY! First off, this is my first fanfic in either fandoms, and my first crossover fic, so please go easy on me. I do love this crossover fandom, and I love 'The Big Four' or 'Rise of the Brave Tangled Dragon' crossover that's been trending. First off, this was inspired by a youtube video: "JackandHiccup *How to Save a Life* by Left4Dead4Ever2, who kindly gave me the permission to write a story loosely based on it. I suggest watching it, its' pretty good.

Like the video, this is general and does not have any pairings unless if you really want it to, I guess. However, its only meant to be Jack Frost and Hiccup friendship/bromance. But you're free to interpret as Hijack/Frostcup.

Sorry if there will be any inconsistencies with canon or something. I tried to make this as close to what the movies portrayed, but still, It'll have to be AU.I won't give too much about the story, or else it'll spoil it. So be prepared for anything! =)

Chapter summary: The war with the dragons is over, and Hiccup has brought in a new era of peace for his village. But, as the ring of dragon raids fall silent, the young Viking heir takes a moment to pay tribute to a friend of old, gone.

Warnings and Notes: Follows canon of How To Train Your Dragon and Riders of Berk, but is AU for HTTYD 2. Follows Rise of theGuardians plot but AU for Jack's background. Pre-Rise of The Brave Tangled Dragon plot. Also, for clarity's sake, Hiccup defeated the Red Death at age 16, and Jack died saving his sister at age 14. Slightly depressing, possible OOC, depending on how you view the characters. Mentions of HiccupXAstrid. Hiccup and Jack Frost bromance/friendship.

Disclaimer: The How To Train Your Dragon and Rise of the Guardians franchises both belong to Dreamworks and their respective owners. Basic story plot belongs to Left4Dead4Ever2. Teenage fanfiction writer here, nothing to see, move along.

PART 1 : MEMORIES THAT ARE KEPT

When Hiccup slipped down the ice to a thousand feet below with only a board of wood, only one coherent thought entered his mind above his own screaming: 'Seriously, after everything that happened, EVERYTHING, I die like this?'.

And then, somehow, he was on top of the wooden plank, gliding down the icy slope. His panic turned to amazement, and he laughed gently in delight. This…this was fun. He tried to get a feel on how to manoeuvre on the board, and used his momentum from the fall to launch upward again.

Ever since meeting Toothless and becoming a dragon rider, he found it easier to take joy from unexpected things and have fun compared to the time he was alone and an outcast in his own village. He dared to continue this…this 'snowboarding', as he decided to call it, and tried to do a few stunts. He managed to succeed them, and howled in laughter. Like when riding Toothless, he could feel the adrenaline running through his veins, and he genuinely was enjoying his time…

…until the plank of wood he was riding on was caught by a Deadly Nadder. He didn't think that they meant to drop him then, probably thinking that he could 'fly' without the board, but that didn't change the fact that he was suddenly pummelling (again) towards the frost covered land.

Of course, a certain Night Fury couldn't just let his dear human fall to the snow. Toothless swooped in and caught Hiccup, and both rider and dragon flew in the air for a bit before settling on a high, snow covered cliff overlooking the sea.

"That was great, Toothless!" Hiccup laughed as he sat against the side of his dragon. Toothless growled in response to his human. "I mean, I've always had fun riding with you, bud, but, that was pretty fun itself..." He exclaimed happily.

Toothless only looked at his human imploringly.

"Oh, give me a break…I didn't know how to have fun before I met you, buddy. Not since – " Hiccup cut himself off, his mood becoming less joyful and more serious. He was in deep thought, his expression neutral, unconsciously trying to hide what his mind was processing. Toothless hadn't seen this kind of expression on Hiccup's face in a while. It was the boy's mask of indifference, and it was only there when he was emotionally hurt or sad.

Toothless gave Hiccup a nudge in the side with his tail, effectively snapping him out of his thoughts.

"Wha…? Oh, sorry, bud." Hiccup ran a hand though his hair, a gesture he only did when he was troubled.

Toothless continued to stare at the young Viking, silently asking him if he was okay.

"Hey, bud, have I ever told you about my best friend before I met you? His name was Jackson Overland, but he's mostly called Jack." Hiccup sighed, his gaze out on the open sea. "He always loved the winter, but loved the snow most of all. He always looked forward to playing in it…"

"Hey, Hiccup!" yelled a ten year old brunette with a mischievous smirk. Said boy turned around, only to get a face full of snow.

"Not fair, Jack!" a nine year old brunette shouted back as he wiped snow off his face with a glare at his friend. As soon as the last remains of snow were removed from his face, another snowball was hurled at him, hitting him so hard that he fell on his back with a yelp.

"Whoops, sorry, Hiccup!" Jack said, though he didn't sound sorry at all. Hiccup could hear the smile in his friend's voice. Wiping the snow off his face but still not getting up, he saw the brown eyed boy standing over him, his hand outstretched.

"Yeah, sure…since when were you sorry?" Hiccup muttered and took the hand. However, he made no effort to get up, instead pulling Jack down on the ground beside him, initiating a short-lived wrestling match between the two.

"Seriously, Hiccup…" Jack panted a few moments later. "…You should try to have fun more! It's like every time you come here you're always so serious. I thought you wanted to play, not pout."

"Yeah, well…" Hiccup panted, trying to avoid his friend's stare. "..Things aren't exactly good on the northern village of Berk. We keep getting dragon raids almost every other night now. My dad's been pretty busy defending the village, so I don't see him much unless he's getting a bunch of weapons from the forge. It's like…It's like, ever since Mom…" He didn't finish his sentence, instead hiding his eyes with his bangs and looking away.

Jack's playful smile turned sad, empathizing with his friend. He knew Hiccup's mother had died not less than a year ago, and Hiccup had gone to a depression after that. Jack had spent the last few months trying to get Hiccup to open up like he used to when they were little (well, 'littler,' as Hiccup always said, albeit bitterly). With his father ignoring Hiccup, Jack knew that he and his own mother and sister became Hiccup's family. He already considered him a brother, after all.

"Hey, come on, buddy. I'll always be here, you know?" Jack said with a smile. Hiccup's glanced back at him, and then broke into a smile too. Hiccup tackled his friend to the ground again, this time kneeling over him.

"You don't think I know that?" Hiccup said.

"Just reminding you, Fishbone." Jack replied with a grin.

They both laughed.

"We…" Hiccup sighed. "Well, we were pretty close, though my dad didn't know about it. There are two villages here on Berk, actually. We're the northern village, Jack's from the south. There's always been a feud between the two, and it only came to a truce to pretend the other didn't exist." Hiccup explained, sighing deeply.

"As the son of my dad, I couldn't make friends from the southern village. I had to keep it a secret." He continued. A part of him idly thought that his friendship with Jack was like his friendship with Toothless; on both occasions, he had to keep silent.

"He had a younger sister, too. Her name's Sarah. I knew her pretty well. She always tagged along every time Jack and I went on one of our 'adventures'. I knew his mother, too. She used to be kind to me…"

"Hiccup, dear. Come in!" Jack's mother smiled at the young boy on her doorstep, allowing the boy to pass through.

"Hey, Hiccup." Jack waved from inside. "Hope you don't mind, Sarah wants to come along. I said yes."

Hiccup smiled at the little girl who hid behind her brother with a faint blush on her cheeks. "No problem. Good to have you for the ride, Sarah." He held out his hand to her, palm in front, waiting for a high five from the girl. She returned it meekly.

"What are you boys planning to do today, then?" Ms. Overland asked.

"Hiccup and I are going to have a snowball war! I'm so going to beat you." Jack exclaimed excitedly, addressing the last part to Hiccup.

Hiccup smirked at his friend. "Too bad for you, I've been working at the forge with Gobber, the blacksmith. I've invented a –"

"Yeah, yeah, inventing stuff." Jack interrupted Hiccup, pretending to yawn with boredom. "You're still going to lose."

"Boys, wouldn't that be dangerous? It's extra cold today, and you could get hurt. And what would Sarah do while you boys fight?" Jack's mother asked, concern evident in her voice.

"Oh, don't worry, Ms. Overland." Hiccup smiled up at her brightly. "We'll be extra careful, I promise. And Sarah can be the referee, that way, if there's a foul in the game, she'll be the one to stop us. Or if either one of us gets hurt, but I promise that won't happen. Would you like that, Sarah?"

Behind him, Jack was mimicking Hiccup's words with his hand, randomly opening his own mouth but with a bored expression. Sarah tried to say yes to Hiccup, but was overcome by giggles at her brother.

Catching on the joke, Hiccup whirled around. "Jack!"

Jack only grinned at his friend, slinging his arm around the younger boy's shoulder, turning him back to face his mother.

"We'll be fine, mom." Jack said.

His mother only rolled her eyes "Alright, alright. You can go. At least one of you is-" She never finished her sentence, because Jack had already dragged Hiccup out the door, Sarah trailing behind. Shaking her head lightly, she noticed that her son was only wearing his shirt, vest and pants.

"Jack!" She called. "Come back here, you forgot you're cloak. You'll catch a cold."

"Don't worry, Ms. Overland!" Hiccup called back over his shoulder. He unhooked his own cloak and tossed it to his friend, who caught it and started putting it on himself. "I brought an extra, just in case. We'll be back before sunset."

The three of children all turned back to her and waved, Jack pointing at the boy beside him and smiled cheekily at his mother before turning back. Ms. Overland only shook her head, smiling lightly.

"That young Viking," She muttered to herself. "May not have a big build, but he does have a big heart."

Hiccup smiled slightly at the memories. This was before he had met Toothless, before he had that urge to make his mark in his village. That was a time when he was innocent, when all he wanted was to have fun, too.

"But, one night," Hiccup addressed his dragon, who watched him sceptically. "We decided that it was cold enough to go ice skating the next day. Jack insisted that it would be fun, and he'd bring Sarah along for the ride. I never realized how bad that plan was. That was…" Hiccup trailed off. He drew his knees closer to his chest, putting his cross arms on top of them. He let the memory of their last encounter wash over him, pulling him into the past.

Thirteen year old Hiccup was making his way through the forest, the only means there was to travel between the northern and southern villages of Berk. He had wanted to come at their agreed meeting place earlier, but because of a 'talk' with his dad that morning, his departure from the village was delayed.

Nearing the lake they had agreed to skate on, Hiccup couldn't help the smile on his face. Jack was the only person his age that treated him like a human being, like he wasn't someone beneath him. Sure, he played a lot of tricks on the younger boy, but it was all in good fun. He knew Jack's sister and mother, who accepted him as a part of their family too. Heck, considering that no one in his village knew who he was or cared, he could probably move to Jack's village without either parties protesting.

'Besides,' he mentally said bitterly 'Jack, Sarah and Ms. Overland are more of a family to me than my dad is now.' It was something he had come to terms with, if he were to believe in the saying that home was where the heart is. Considering that his heart wasn't in his father anymore, not in his own village anymore, then surely, his home was with Jack and his family, right? Jack was already a brother to him…

His thoughts were interrupted when he came upon the lake. He saw Jack for about half a second before the ice cracked beneath him and he fell through. He noticed Sarah nearer to him, but still on ice that seemed too thin. The fate of his friend had yet to register in his mind, but he did manage to run to his sister, grab her by the waist and run back to the snow covered ground.

"Hic…Hiccup…Jack…is he…is he..?" Sarah said, biting her lip, tears already rolling down her face.

Hiccup couldn't breath. His mind was only beginning to register what happened. Jack, his best friend, his only friend, was gone. Lost beneath the freezing ice he loved.

Hiccup sucked in a breath he didn't realize he was holding. Jack…was dead. Gone. Lost. Forever.

"I...he…he's…he's gone, Sarah…he's gone…" Tears formed at his eyes, but he refused to let them fall. He had to be strong, strong for Sarah, Jack's little sister, whom Jack loved more than he loved himself.

"He…he tried…to make…it…a game…pushed me out…then the ice…ice cracked…he…he…" Sarah sobbed, hugging Hiccup around the middle, burying her face in his shirt.

Hiccup could tell even from where he stood that the ice was too thin to support a person's weight. Jack, of course, would not have taken the time to check. He was reckless like that. He once commented that the reason he and Hiccup became quick friends was because the latter had to balance out his daredevil attitude.

Had Hiccup been there, he would've warned Jack not to skate on the ice.

If he had been there, Jack wouldn't have died.

Becoming aware of the little girl's arms around him, he knelt down to embrace her properly as well, acting as her comfort when her brother was not there to give it. She sobbed into his shoulder, and he didn't stop his own tears falling onto the cold ground.

"Come…come on, Sarah…I'll take you home." Hiccup said in a wavering voice. Sarah nodded but did not let go. Instead, Hiccup carried her home, allowing her to continue to cry into his tunic.

As he walked unsteadily through the snow, he decided he would be the one to break the news to their mother, not Sarah. He had to spare the girl from more heartbreak. Even if it meant his own.

Her brother, his best friend, Jack, had just died. He could have prevented it, but he wasn't there.

To him, only one thing kept repeating itself over and over in his head…

"It was my fault." Hiccup whispered to himself. "It was my fault he died. I should've been there."

He stayed silent for a while. Toothless understood, really he did, what his boy was feeling. Hiccup's gaze was distant again, seemingly looking at the past instead of what was in front of him. The Night Fury gave a soft growl, silently comforting his human.

Hiccup wiped his eyes with the sleeve of his shirt, only then noticing the tears that had started to roll down his cheeks. After a few moments, he stood up and smiled gently at his dragon.

"It's okay, buddy. I just remembered him because of the snow and fun times. If he were here, he probably would've enjoyed that snowboarding I just did." Hiccup said, trying to hide the sadness in voice. "I've done my best to honour him. Come to think of it, I think he would've loved to meet you, Toothless."

Said dragon gave a purr, standing up and shaking a bit as he did so. Hiccup petted him.

"Yeah, I know, bud. I'll see him again, one day, I think. Hey, maybe you guys could meet then, huh?"

Toothless continued to gaze at his rider, earning him a light chuckle from the boy.

"Yeah, that'll definitely happen. Come on, bud. Let's go home." Hiccup mounted Toothless in one swift motion, and then they were off in the air, darting between the clouds or dropping down to graze the sea. Boy and dragon flew together as one, trusting each other completely, throwing all grief and worries to the wind as they dominated the sunset sky.

For a certain white haired spirit of winter, it was a coincidence for Jack to be there when the kid when he slipped and fell. Knowing that he probably wouldn't survive the fall, the spirit had flown down to cushion the kid's fall with his wind, but was surprised when he managed to get the board below him and navigate the icy terrain. He followed him as he did his exhibition, silently amazed by how a regular human being could be so in-control as much as Jack was with the ice.

But when the kid's board lodged itself into the teeth of some wicked dragon which promptly let the boy fall back to the white covered ground, Jack flew as fast as he could to catch him, fearing that the teen might cause permanent damage to himself.

He was rather startled – okay fine, frightened – when a black dragon caught the boy, thinking that the reptile would eat the kid. But when he caught up to the beast, he saw that they seemed to be friends, as the boy rode him as if he belonged there.

The dragon landed and the boy jumped off. Only then did Jack notice that the kid had only one leg: the other was a crudely made metal prosthetic. The boy seemed about sixteen to Jack, and he idly wondered how someone so young could lose a limb. He considered talking to the kid, but he seemed to be deep in thought – talking about some friend of his that died and that it was his fault, apparently.

Part of him wanted to throw a snowball at the boy, just for fun, but the dragon he was with seemed to be able to see him, and regarded him with narrow eyes. So Jack decided to leave the kid alone, instead trying his hand at this 'snowboarding' the kid did. Upon seeing that the spirit would not harm his owner, the dragon's pupils dilated and turned his attention back to his boy.

As he made his own tricks in the air while riding his staff as a board, he noticed the kid flying once again oh his dragon, this time away from the glacier they were in. Jack was having too much fun snowboarding to follow him, but he was pretty sure he wouldn't forget the kid.

It was the first time Jack had seen the boy, but he silently hoped he'd run into the scrawny kid again someday. He seemed interesting to Jack, and it probably took an interesting person to be able to see Jack Frost, the winter spirit.

Enjoying himself too much, Jack continued his little trick of fun, throwing himself to the mercy of the wind.

- End of Part One -

Yeah, so that's the plot. Jack and Hiccup are childhood friends. But there's more significance to the story than just Hiccup. Everything happens for a reason. But what reason was it for Jack to know Hiccup, and yet not meet him? More info next chapter.

So, what do you think? Tell me, I'd love to hear! There will be three parts in all, and honestly I've already written them, but I wanna see first whether this'll get any attention. I really wanna know how much love this fandom/crossover thing can get. I'm considering posting this on tumblr, or a t least a preview.

Oh, and for those who don't know where the Hiccup scene came from, its from something called 'Racing For The Gold' which was a bunch of TV adds featuring the HTTYD gang. In one of them, it shows that Hiccup was the one who invented snowboarding, after falling down some ice. I wasn't sure if it was cannon, but I thought it'd be cool.

Anyway, Thanks for reading! ^.^