Summary: Harry jumped into the Veil to save his godfather. Both thought they were going to die, but instead they ended up far in the past where humanity is still trapped inside the three great walls and the Titans are still walking free in this earth.

Warnings:overused theme, tragedy, character deaths, possible slash/BL, AU, random updates, grammatical errors, and misspells.

I don't own Shingeki no Kyojin or the Harry Potter series!

Please read the important notes in the bottom before you ask anything!

Chapter One,
Their Will to Live

"Sirius! There's two approaching from the left!" Harry shouted in panic as he bent his neck to look if there were more of them approaching from behind. The horse they were riding was galloping roughly in a fast pace, making Harry's head hurts and his vision blurry, but he could make out the shape of another 15 feet tall giant running towards them at high speed. Harry paled and his hands that were clutching his godfather's shirt trembled in fear.

"I'll take care of them! Harry, just focus on the ones coming from behind, ok?" His godfather shouted back as he brandished his right arm and shouted the killing curse at the two approaching giants. The sickening green lights hit his targets and they fell to the ground with a booming sound. The dog animagus cursed when he saw more of them coming from his front, but before they could close in on them they were hit by another killing curses and dropped down like flies to the ground. "Shit, where do all these giants come from?!"

Harry pointed his right arm at the running giant from earlier and shouted a killing curse at it, paling as it hit a tree instead of the giant. The giant grinned wide at him, showing him his creepy teeth before he raised his hand and smacked it to the ground, making their horse lose its balance and dropped them. Harry screamed in terror when the giant's hand grabbed his waist and lifted him up to its face, but before the giant could bit him, a green light flashed and hit the giant's face.

"Harry!" his godfather cried as he fell from the giant's limp hand, 15 feet from the ground. He closed his eyes and covered his head with his arms, before he felt his godfather's magic washed through him and he felt his fall slowing down until strong arms caught his body in mid-air. He trembled in those arms as his godfather hugged him tightly.

"I thought I was going to lose you," the man whispered shakily as he kissed his hair. "Never scare me like that again, okay?"

Harry wiped the tears in his eyes with shaky hands and nodded. "I'm sorry."

"Come on, we have to go now before more of them comes." Sirius ruffled his hair and helped him to his feet again before he rushed to the whimpering horse and checked it over. "Not good. It broke its leg." The man cursed when he heard the booming footsteps closing in their direction. He quickly grabbed his godson's arm and dragged him away from the horse. "We have to run now, Harry."

After casting one last remorseful glance at the pained horse lying in the ground, Harry began to run. They ran and keep running, but there's really nowhere to hide from those bloodthirsty monsters. Anywhere they turn, there were always some giants there, waiting to feast on their flesh with a bone-chilling grin on their faces. Frankly, Harry was exhausted and the both of them were starting to get desperate, but they couldn't afford to rest even for a moment now, because there's no safe place for them to rest.

Harry wanted to cry. What the hell was happening to this world? Why were there no other humans around? Why was this world being swarmed by those giants?

As they keep running and killing anything that was in their way, Harry tried to remember the events that occurred in the last twenty-seven hours of his life. He was just trying to catch his godfather when they both fell into the strange veiled gate-like thing inside the Death Chamber. Harry seriously thought that his life was over, but then he opened his eyes and realized that he was still alive. That he and his godfather had survived. They were both really glad that they were alive and well, but that was before they learned the existence of those monsters.

They fought like hell to keep themselves alive; using every resource they found in their way to boost their chance of survival. They used every curse they knew, but since only a few of them could actually harm those monsters, they had resorted to use the Unforgivable one-hit killing spell, "Avada Kedavra".

It was such an irony that the curse that brought them so much grief and sadness and made their lives hell back 'home' would be the very curse that saved their lives today.

But the killing curse was dangerous to be used continuously in a long period because that spell requires you to literally shoot your life-force off to take the lives of others. If you used it too much, not only your body's condition will deteriorate, but your mental state will also be corrupted. The Dark Lord Voldemort was a fine example of someone who used that curse too much, and Harry didn't want to end up like that.

Not to mention they didn't have their wands with them. If not for this world's strange air, which was brimming with magic, they wouldn't even be able to use any magic at all! Harry was scared. What if suddenly they ended up running to a place where the magic was so thin or even completely non-existent? They would be completely defenseless against these creatures.

As they finally got out safely from the forest, Harry saw something at the corner of his eyes. There was a giant wall in the distance. An idea formed in his brain and he tugged his godfather's hand tiredly to get him to stop running.

"Sirius, look! The wall there," Harry panted, pointing at the tall wall. "We should go up there. They can't possibly reach us if we're that high."

"Alright," his godfather nodded and tried to calm his breathing too. "You have an idea on how will we get there?" the man asked as he grimaced at the way his sweat-drenched shirt clung to his skin. He had discarded his robe earlier in the game since it got in the way, so now he was wearing only slacks and a shirt. Oh, he was so going to take a nice long warm bath and go shopping for some nice robes once they were back to his house, his fugitive status be damned.

"My animagus form." Harry answered him with a nod. "I'll try to get only my wings to come out. That way I can carry you up there with me too."

Hearing his answers, Sirius shook his head and turned his face away. "No. It will put too much strain on your body. We'll find another way to get there."

"There's no time to find out another way Siri!" Harry grabbed his godfather's arms and forced the man to look at him in the eyes. "Even if we can reach that wall safely before those giants catch us, there's no way you can climb that high in your state right now. There's no way I can climb that high in my state right now!"

It was true. Not only they were both already very drained from all the magics they used and from running for so long, they were both injured everywhere. Even if they were in their pristine condition, Harry doubted they could climb up that high without the proper climbing equipment. He knew it would be painful and dangerous for him, since the human body is not meant to have animal appendage growing on them after all, but this is their best options for now. There's no time to think of another solution.

"This is our best options, Siri. Please let me do this." He tried to convince the worried man.

Sirius opened his mouth to protest. He was hesitant to allow his godson to try a partial animagus transformation since not only it will put too much strain on the boy's body, it could be dangerous if he do it wrong and he could end up stuck like that for the rest of his life, but hearing the booming footsteps of another giant running towards them and seeing the determination on his godson's eyes, his protest died on his lips. "Alright." He relented. "Just... be careful, okay."

Harry smiled slightly and nodded at him. "I will be careful, don't worry."

He quickly stripped off his button up shirt and passed it to his godfather before he concentrated on his magic. At first he only felt the dull, uncomfortable pain of the bones and muscles on his back shifting, but then the pain grew and he felt something trying to pierce his skin from the inside out. He screamed and fell to his knees when the pain became too much for him to handle. Bones were coming out of his skin and his muscles were trying to wrap themselves around them.

Vaguely, as feathers began to sprout from the growing appendage on his back, he sensed his godfather killing another three giants that tried to approach them. Finally, the pain receded a little and he experimentally tried to flap his newly formed wings, which was about two feet longer than the span of his arms spread out and white in color, just like the wings of his animagus form. He felt his body floated slightly in the air and a relieved smile formed on his face. It worked. Thank God.

"Sirius!" he called out to his godfather. "Let's go."

"Alright." Sirius moved towards him and helped him to his feet again. "Is your body okay? How are we going to do this?"

"My body's fine, just aching a little." Harry answered. "Here, hang on tight." He held onto his godfather and tried to lift them off the ground, and for a few seconds he succeeded before his wings gave up and the both of them fell to the ground. "This is harder than I thought." Harry grumbled as his godfather nursed the bump in his head with a groan. "I'm sorry. Let's try this again."

His godfather nodded in consent and helped him up once again. "We need to hurry; I think I hear more of them running in this direction." The man touched his wings hesitantly. "You know if it hurts too much for you, we can still try to find another way."

"I'm fine, Siri. They still feel a bit wobbly, but don't worry about it. I think I'll be able to do it this time." He flapped his wings twice to test them again. Honestly, it still ached a lot, but he didn't want to worry his godfather more than he already has. "Hold on to me."

With a strong gush of winds, they took off to the sky. Harry marveled the feeling of flying while he was (mostly) still in his human form. It felt different from when he was in his swan form, because then it just felt natural to him and he didn't feel the pleasure anymore.

"Amazing," he heard his godfather whispered in awe.

Just that one word and Harry felt all his exhaustion wore off.

He flapped his wings once in a while; otherwise he let the wind guide him to that place. It felt nice and Harry felt contentment from doing this, though it was terribly hard to adjust his godfather's position so that he didn't slip off and fall, as they were in the air and there was no foothold to ground their moves. Watching as the horde of giants trying to run and jump after them was really scary too.

"Harry, a tall one is approaching from the right, your five o'clock." His godfather said in warning. Harry craned his neck to catch a glimpse it and panicked. It was fast! Way faster than anything they've encountered until now! "Siri, kill it! I'll try to get us higher!"

He flapped his wings rapidly and tried to reach the wall faster, but they were still half a kilometer away from it and the giant was closing in on them! He felt his godfather fumbling to get a good aim and fired off two killing curses at it, but instead of the booming sound he had associated with the giants' death (as they hit the ground) he heard explosions instead. Instantly he whipped his head toward the explosion and saw green fires burning the grasses and land, but the giant was still chasing them.

"Shit, I missed!" Sirius shivered as the giant grinned at him, his face paling when he realized that he didn't miss. It dodged them. "Harry, faster! This guy's dangerous, it's not as mindless as the others!" he yelled as he shouted more killing curse at it.

"I'm trying!" Harry yelled out as he pushed himself to fly faster. They were so high in the air he had himself convinced that the giant wouldn't be able to reach them, but then a hand shot up beside him and hit his right wing. He screamed and almost lost his balance and let Sirius fall, but thankfully he was able to catch the man's hand in the last moment.

"Harry!" Sirius cried desperately. "Harry, are you okay?!"

"I'm fine!" Harry lied. He had felt the painful crack on his wing when it was hit by the giant. He suspected that something was broken or at least fractured inside his wing; it was painful enough to make his vision blurry and his hands trembling, but he tried to ignore the pain and forced himself to beat his wings faster. He had to do this or the both of them will die, he thought as he gritted his teeth in pain.

They were so close.

Just a little more and he would reach that wall… but his wings couldn't take it anymore.

At this rate the both of them will really die.

Harry shook his head. No… he wouldn't let that happen!

Taking a deep breath, Harry gripped his godfather's hand tighter and spun in the air, using the force of his movement to boost his godfather up before he let go of the man's hand and threw him over the wall.

The moment Sirius's body crashed onto the wall's surface, his wings finally gave up and his body accelerated toward the earth limply. He smiled weakly to himself in relieve, at least his godfather will be safe now.

The giant from before was waiting for his fall with its mouth opened wide as if it was waiting for him to fall in there. As if time was in slow motion, he saw his godfather's mouth moving but he could hear no sound. The man's gaunt face was contorted in anguish and fear.

Right before he fell into the giant's mouth, the reality of the situation finally caught up to him.

He was going to die.

He was only fifteen and he was going to die.

"No…" his eyes watered in fear and regret.

There were still so many things he wanted to do, so much he wanted to see and experience. He didn't want his life to end before he could really live out his life. Not after all he's been through to survive until now.

"No…!" He clenched his eyes shut.

He didn't want to die like this…

He didn't want to die like this…!

Someone please…!

"Harry…!"

End of Chapter One

Hello! I made this story a few weeks ago as a request from my friend, Amaryllian-dra. I know my grammar is not exactly the best and my writing is really messy, but I hope you enjoyed reading this first chapter of Flaming Water and Frozen Earth despite my mistakes.

Truthfully I am a little afraid to publish this story since this is the first story in this category and I have never written a crossover before. I have zero confidence seriously orz.

If you have suggestions as to how I should continue this story, please do tell me in a review or via private messages. They will surely help me a great deal and give me inspirations to write!

Thanks for reading!

Important notes!

Regarding pairings: I don't know if I will manage to put some romance in the story without messing it up, but if there're pairings it will probably be Jean-Harry and/or Rivaille-Eren since I love slash (Rivaille-Eren is my OTP XD).

Regarding names: Yes I am aware that the Corporal's name should be romanized as "Levi", but I like "Rivaille" better so I'm going to write it like that.

Regarding timeline and age: I'm not sure what year currently is in the canon, but I'll just assume that it's the year 850. This chapter happened about fourteen months after the fall of Wall Maria, so it's the year 846. Harry is fifteen and Sirius is thirty-six (I think?). Eren, Mikasa, Armin, Jean, Historia, and Connie are eleven; Marco, Sasha, Annie, and Berthold are twelve; Ymir and Reiner are thirteen, and Rivaille is twenty-seven. The Shingekyo kids have started their training in the military camps for about two months, so technically later they will be Harry and Sirius's sempai! XD

Lastly, if anyone knows how old Rivaille is in the series, please tell me! I don't know why but I always assume that he was about thirty-one lol /shot