Hey everybody, Dragon King Acnologia here. I've a new story that actually isn't new at all.

What Kind of Story: It's the rewrite version of 'Etherious Natsu Dragneel', the manga chapter 436 was really ruined the plot of that story since it was revealed that Zeref is actually Natsu's older brother so I have no choice to put the fic down and create a new.

The Pairing: I've already decided that the pairing is purely E.N.D Natsu x Fem Acnologia. I know Acnologia is a male (A badass one) but I couldn't help but wondered what would happen if two of the most powerful being in Fairy Tail universe become a couple.

The Plot: Unlike the original version, there won't be any modern element in this story. I admit it was hard to mix Magic world with modern element, so this is will mostly following canon Fairy Tail with few my own touch.

Acnologia's human appearance: Just like the original story, she looks like Ophis from Highschool DxD since she is also a powerful Dragon.

"I'm all fired up" - People Speech

'I'm all fired up' - People Thoughts

"I'm all fired up" - Creature Speech/Attack/Spells/Translation

'I'm all fired up' - Creature Thoughts

(I'm all fired up) - Sounds Effect

I'm all fired up - Day, Date, Time, Place

[I'm all fired up] – Time Skip

Disclaimer: I don't own anything in this story

The Story of Demon and Dragoness

Episode 0: The Origin

Sunday, July 7th, Year X377, 11:00 P.M, Earthland.

Over 400 years ago, the Dragons were the Kings of the World. The humans were food to the Dragons who flew the skies, freely dominating the lands and seas. However, an unknown Dragon questioned the reign of the Dragons. The latter wanted the Dragons and the humans to coexist in the world. A war brewed between the Dragons who supported Dragon-human coexistence, and those who were against the ideology.

The war spread chaos through the lands and the Dragons were at stalemate. The human-supporting Dragons devised a cunning plan. They provided some humans with Magic that allowed them to slay Dragons, giving rise to the fearful Dragon Slayers. The plan proved to be very successful, as the human-supporting Dragons gain the upper hand in the war. However, they did not anticipate an unexpected element, neither from human-supporting dragons or from non human-supporting dragons.

The unexpected element was a human known as the Kuro Madoshi [The Black Wizard] Zeref Dragneel. Zeref Dragneel was considered to be the strongest, most evil Mage of all time, who possesses extremely dangerous, and powerful Magic that made him to be feared y human and dragons alike. He created a race called Eteriasu [Etherious], given birth to tens of thousands of Demons, and thrown the world into chaos.

And the result was a massive Crimson rain.

A rain that made of bloods from all out war between the three sides, sputtering down relentlessly upon the cracked stonework, trickling down through vast valleys of wreckage, stained red as it mixed with the blood of the fallen. The world was experiencing the worst period in the history of humanity, almost humans and dragons alike was almost extinct by a lone figure who stood among the mountain of humans and dragons.

The lone figure was Etherious Natsu Dragneel, in short E.N.D

Despite being a Etherious, E.N.D was looks like a lean, muscular young man of average height with a slightly tan skin tone, black eyes, and spiky pink-colored hair. He was Zeref's younger brother as well as his greatest masterpiece that surpassed even the Kuro Madoshi himself. A Demon that even mightier and feared more than anything in Magic World.

But inside all those fact…he was and still a human.

Natsu Dragneel was born on May 8th X358 but died when Natsu had a rare disease. He was then revived by his brother by using his Ankuseramu no Kuro Maho [Ankheseram Black Magic].

Years had passed and Zeref glad he finally to able to reunite with his younger brother and couldn't help but proud that Natsu showed his result of becoming demon that beyond Zeref's expectation. At the age of 5, Natsu killed a dragon that tried to eat him when he was taking a bath at the lake near where he was living. Seven years later, at the age of 12, Natsu created three Etherious whose power could rival a high-class dragon and gods. And the three Etherious were The Lucifer sisters and Mard Geer Tartaros. After he was successes with his first three demons, Natsu created nine other demons he called them Kyukimon [The Nine Demon Gates] as his personal pets.

Until at the age of 19, Natsu lost control of himself and went on rampage. He jumped himself into the Dragon Civil War to satisfy his thirst for bloods, during his rampage he killed numerous dragons and human while Zeref only watched from the sideline and couldn't help but amazed at his greatest creation. During his rampage, Natsu had killed numerous dragons and humans that in his eyes sight but unbeknown to everyone, inside Natsu's soul, He actually had a fierce fight against his inner demon in order to take over his body back. Natsu nearly died before a certain girl appeared inside of his soul and aid him until Natsu defeated his inner demon.

As he went back to real world, his knees gave up and he collapsed on them while staring at the surrounding before him. Two months had passed and he couldn't believe it how much the destruction he caused during his berserk. Dragons and Humans were laying on the ground, dead, whether they're adult or children. Soon, a full-blown rain made of bloods, soaking his spiky pink hair.

He smiled bitterly when he realized that probably the sky was crying for the world's loss. Unable to contain it any longer, Natsu clenched his teeth as he lowered his head, and hot tears rolled down his cheeks.

"Why…Why did everyone have to die…? Why was I so weak? Why?" He murmured to himself. He blamed himself at the destruction of the world.

His hands clenched into fists so hard, that his nails dug into his skin and drew blood. Shakily, he tilted his head back, and he gave out a pained roar.

"WHY!"

His mind was numb, his skin cold. He sat there, and cried it all out, not realizing that he had yet to lose his powers, neither that a figure was heading towards him. Suddenly, Natsu was brought back to reality when he felt something warm touch his cheek. His eyes snapped open. There stood a little prepubescent girl, no older than twelve years old.

She has pale skin with long black hair down until her hips and gray eyes. Her ears differ from a normal human's as they have pointed tips, although her long black hair makes this feature difficult to notice. Her clothes were tattered, perhaps during the battle and most of her body was covered in bloods, hell, even her right arm was gone.

Natsu almost didn't recognize the girl before his eyes softened at the sight of his first and only friend. "Ashley!" He uttered her name tenderly.

Ashley Aguilera was the very first and considered the strongest Dragon Slayer. She was found as an orphan by the strongest dragon by far named The Great Black. Despite her young age, Great Black found Ashley had potential to become a Dragon Slayer and taught her the Kuroi no Metsuryu Maho [Black Dragon Slayer Magic]. At the age of seven, she met with Natsu when she was travelling around and fought him. The battle was close, Ashley pushed Natsu to his limit and forced him to unleash his Eteriasu Fomu [Etherious Form] before he eventually overwhelmed her and resulting her lost. Ashley thought Natsu would kill her but too much her surprise he didn't for reason why would you kill a strong opponent if they could get stronger and you could fight them again. He healed her wound and complimented her for her strength despite her young age, not to mentioning he was smiling and told her his name before he walked her home and told Ashley to get stronger so they could spar again.

Since that day, Natsu and Ashley grew closer to each other, hell even Natsu gave her a necklace made from the best diamond he found during his journey. Natsu still couldn't believe it he would find another human that he considered equal aside from his brother.

Ashley simply smiled sadly at her only friend's sight. She knew this is the Natsu she knows, not some monster who slaughters everything in his sight. "I think that you've suffered long enough!" She said gently before put a hand on his shoulder before darkness enveloped them as they disappeared from the ground zero.

Sunday, July 7th, Year X377, 11:10 P.M, Earthland, Unknown Place.

Natsu slowly opened his eyes and find himself in the middle of ruins. Natsu immediately recognized the place as his destroyed village. Natsu wondered why did Ashley brought him to his birthplace. Natsu was about to asked but Ashley motioned him to follow her, they walked deeper inside the ruins before the spotted a massive cave near a lake where Natsu had always gone fishing. They entered into the cave and noticed the cave was so darks, it's difficult to see what's inside.

After they walked for a good five minutes, Natsu spotted an almost ruined shrine that looks so old in his opinion. The shrine was almost wrecked, one good earthquake shall bring the shrine crumbling to the ground. As Both Natsu and Ashley entered the shrine, Natsu was struck in awe of the place. There wasn't much about the place. It was a total mess with broken walls, moss growing everywhere and the usual rat or two that scampered away at their appearance.

'Wow...I wonder when this place was built?' He thought, looked around the ruined shrine as he still followed Ashley to wherever her destination is. 'It's pretty big...I'll give it that. And this place looks pretty old too.' Natsu snapped back to reality as he bumped onto Ashley who suddenly stopped walking.

"We're here!" She told the pink haired Etherious. Natsu rubbed his head before saw a stone coffin in front of him. The coffin has 6 inch length and 4 inch width and covered with weird drawing that looks like dragons, had three way war with demons and angels.

Natsu raised an eyebrow at this, what are Ashley gonna do with this stone coffin, does she want to buried him inside that thing. Does she hate him for all what he has done. If it's true, then he couldn't really blame her. She had lost her parent dragon and her right arm because of him, she must be both scared and pissed right now so she wanted to get rid of him. He didn't mind, the world would be saved if he died. Natsu saw Ashley chanted some kind of incantation that he couldn't recognized. As soon as she finished, the stone coffin opened by itself.

He knew this is the end of his life. "I understand!" Natsu muttered quietly but Ashley was a Dragon Slayer so she could hear what he just muttered about.

"Understand what?" She asked rather curiously. Natsu couldn't detect any malice intent or hate in her voice and he knew she didn't hate him. Why she didn't, after what he has done to her, she should have a large amount urge to kill him on the spot or tortured him before she finished him off.

"Understand that you despise me!" He wasn't expected her widened her grey eyes but he continued. "I killed your mother….tore your arm off while tried to kill you. I caused nothing but pain to you. I understand that you want me dea-" Ashley cut him by slapping him hard on the face with her remains hand, causing Natsu's eyes widened in shock. His hand reached where Ashley just slapped him as she glared at him, her eyes filled with pure rage.

"YOU IDIOT!" She yelled right in front of his face, while grabbing the collar of his shirt he wore. "How could you think that I'll will hate you, how could you think that I want you death." Couldn't hold it anymore, Ashley broke down in tears after her friend thought that she would abandon him for being a demon.

Natsu gazed softened at her crying state, he hated seeing her like this. Ashley was supposed to be strong, she was the only person who Natsu allowed to kill him. Natsu slowly reached for her and pulled her into a hug. He soothed her before asking. "If so…then why did you bring me here?"

Ashley calmed her down a bit, wiping her tears from her eyes before answered. "I brought you here so that you can be saved." Natsu widened his eyes at that. Why would she want to save a monster like him. Natsu really couldn't understand.

"I don't understand…I'm the destroyer of this world, slaughter numerous of innocence being, why would you want to save me so badly?" He asked her, eyes filled with sadness and guilty. He felt her hand caressed his cheek and his eyes met with hers.

"It's because I believe that you're the only one who could kill Zeref. I believe that you're the savior of this world and Zeref is the true destroyer of this world." Ashley answered without hesitation while looking directly to his eyes.

"I'm not the savior!"

"YES, YOU'RE!" Ashley snapped at him as he tried to deny again. "Perhaps not right now, but in the future you shall be the savior of humanity. I'm planning to seal you here until the right time has come for you to be awakened. Get stronger, gains allies and I believe you can save this world."

"But what about you? You will die, Zeref would kill you if he find out that you're hiding me." Natsu asked her with concern in his voice, she dying for him was the last he wanted her to do.

"I'll be fine…" Ashley lied and she was sure Natsu knew it. Of course…after she finished sealed Natsu, Zeref will come to here and demanded to tell him his little brother's where about. And of course…she wouldn't tell him even if Zeref killed her. "…Just promise me. After you kill him, you will live on for my sake."

"But…" Natsu was about to protest before he felt a lips crashed on his. His eyes widened in shock as Ashley pressed her lips on his own.

"I love you…Natsu Dragneel." Ashley confessed before she pushed Natsu inside the stone coffin causing him to stumble into the coffin. As Natsu was inside the coffin, Ashley casted her spells on him. "Metsuryu Ougi: SignaculumNigrumDraco! [Secret Dragon Slayer Art: Seal of the Black Dragon]!" Right after she finished, four gigantic black magic circles appeared around the coffin and the coffin slowly closing by itself. Natsu struggled but have no success since the spell was so powerful. He looked at her one more time before Natsu heard Ashley uttered her last words to him while tears leaking from her eyes.

"Good bye, my love!"

"ASHLEY!" Natsu called her name one more time and that was the last thing he remembered, before darkness engulfed him.

Ashley smiled sadly after knowing her friend was saved and will be awakened to save this world from Zeref. She looked at the sealed stone coffin one last time before leaved the shrine, not forgetting to put additional seals from the outside of the cave before she transported back to the battlefield vie the way she came here first.

As Ashley opened her eyes, she found herself in the battlefield that had turned into wasteland from her fight with E.N.D. The corpses were still there, still fresh. All she has to do is to ensure Zeref will never found the place where her friend was sealed. Even if she was captured by Zeref she would tell him nothing even if he killed her. Her friend safety was the top priority now.

"I figured out you'd be here." She spoke before tuned around to saw a young man wearing high-collared black and tan robes with gold trim, along with a large, flowing white toga draped around his torso. He has short black hair, dark red eyes, and abnormally sharp canines. He also wears a circle-shaped necklace.

The young man known as Zeref glared at her fiercely, red eyes filled with rage after knowing the girl before him was hiding his greatest masterpiece. "Where is he?" He demanded coldly as black mist floated around him, indicating that he was utterly pissed. "Where is E.N.D?"

"Leave him alone Zeref!" Ashley replied coldly not afraid of his threat despite her current state with her right arm was gone. "He's finally free…you have no right to claim him anymore."

"He is my brother…so I have the right to claim what is mine." Zeref countered while he increased his vast Maryoku [Magical Energy] that caused a massive earthquake the could be felt from entire Earthland.

If Ashley was a normal twelve years old girl, she would be trembled in fear right now. But Ashley was no normal girl, so she only glared at Zeref while released her own Maryoku. The tension in the air was like watching the cloud roll in before a lightning storm began.

"Akhilleus! [Achilleus]!" Zeref whispered, and a massive black wave shot that eredicated everything on its path toward Ashley who swiped her left arm three times and protecting herself from Zeref's initial attack with black sphere of magic. As the attack dissipated, Zeref was nowhere near her eyes sight.

Ashley widened her eyes as she felt his presence behind her, she spun around and somersaulted in order to avoid a giant black axe made of black energy before took a deep breath. "Kokoryu no Giga Buresu! [Black Dragon's Giga Breath]!" She quickly gathered and releases a gigantic quantity of black Maryoku from her mouth at Zeref.

Zeref wasn't faze by her attack and simply took a sidestepped, the attack passed through five mountains behind him before caused a titanic explosion of magic that could felt from radius 10 miles.

Zeref only shook his head in amusement. "Even at your current state, you still have some power left. You're truly formidable…No wonder my brother was interested in you." Zeref spoke, slightly complimented her for her strength despite her young age.

Ashley wasn't even flattered at the compliment as she dashed at Zeref with incredible speed before jumped, raising her arm while gathered a large amount of magic around her left hand which slowly turned into a long pitch black sword made of magic. "Kokuryu no Tsurugi! [Black Dragon's Blade]!" With a roar, Ashley executed a vertical frontal slash with it caused a huge, linear blast to be generated in front of her, surging up to the sky in height and covering an incredibly long area seemingly several kilometers while causing astounding damage, capable of drastically changing the appearance of its elongated point of impact.

Ashley landed on the ground only to found that the was ineffective in striking Zeref, with the Kuro Madoshi remaining unharmed some meters away from the huge crater generated by the attack. Zeref gathered a black orb in his right arm before threw it at the Dragon Slayer who ducked just in time before it hit her and saw that the attack caused a giant crater behind her. But Zeref took this as an opportunity and dashed at her at the speed that she couldn't follow at her current state before straggled her neck, lifting her a bit.

Ashley desperately gasped for air, trying to break free only for Zeref to tighten his grip on her neck. "I ask you one more time….Where is my brother?" He asked to the black haired girl only for her to spat at him and smirked.

"Go to Hell!" That was enough to made Zeref completely pissed and he tightened his grip even more and was about to killed her before something just came out in his head before he grinned devilishly as his other gathered black Maryoku that took a shape of a pure black snake. Ashley noticed his grin and couldn't help but scared a bit, not knowing his intention with the snake in his left hand, "W-What are doing?" She asked between gagged as the snake in Zeref's hand slowly shot towards her face.

"Instead of killing you…I've a better idea!" Zeref told her as the snake began to force its way into Ashley's mouthed causing Ashley struggling even more but it's useless since Zeref's grip on her neck was so tight before she forced to swallow the snake. Zeref dropped the girl as the girl jerked uncontrollable as her right arm regenerated and her skin getting darkened while he started walked away.

"You take a pride being a Dragon Slayer…" Zeref spoke as Ashley's body getting bigger. "…you and the other dragons that supporting human hunt down the dragons that didn't want to collaborate with you…" Zeref continued as Ashley's body began morphed into a gigantic-winged creature.

"And now…you will hunt down all Dragon and humans alike….no matter what side they are…." Zeref finished his speech and vanished from the battlefield.

Ashley's body has completely morphed into a mastodonic Dragon whose entire upper body was covered in black, round, scales, which, in turn, were decorated by spiraling, blue markings. Her lower body, specifically her belly, inner tail, and legs, were gray in color, and appear to be rather smooth. Ashley's eyes became white and beady, and her head was round and blunt with four, large, elongated plates extending backward. Her mouth was full of razor-sharp teeth, and, attached to her chin, was a protrusion that resembles an arrowhead. Her large wings were feathery in appearance, akin to a bird's. The scales disappear at the end of her tail, which, in itself, ends in a stinger-esque shape

But before completely vanished, Zeref spoke one last thing.

"From this day on….your name shall become Acnologia….Mokushiroku Ni Aru Kuroki Ryuu [The Black Dragon in the Book of Apocalypse]"

(Tyrannosaurus-Rex Sounds)

Acnologia roared at the stormy skies that shook over the world indicating the future Ryu no O [The Dragon King] has been born into the world.

To Be Continued

A/N: I know there aren't a lot of change from the original story, just few changes of Natsu's origin.

Translation:

Achilleus - He who embodies the grief of the people

Omake:

A chibi Natsu and Ashley stood in front of the mission board.

Natsu (Looks utterly furious): ZEREF, I DON'T CARE IF YOU SAVED MY LIFE OR THE FACT THAT YOU'RE MY BROTHER, I'LL KILL YOU FOR TURNING MY ASHLEY INTO AN OVERSIZED REPTILE.

Ashley (Raised her arms): Now now Natsu, you're not supposed to know yet that I've transformed into Acnologia.

Natsu (Rubbed back of his head while grinning): R-right, sorry.

Ashley (Crossed her arms): Still, I'm not entirely pleased that I've become such a scary creature. I mean, I look like that ugly old Igneel and how am I supposed to make a friend with other kids at my age? They would run before I say a word.

Natsu (Hugged Ashley's tiny body): Don't worry my love, I'll fix it somehow. That's my vow to you.

Natsu & Ashley: Next time, Episode 1: Hargeon X784

Natsu: I swear I will protect you, no matter what!