Okay so this is another "Natsu is E.N.D Theory" story with my favorite pairing Natsu and Lucy. Basically it's my idea that during the battle with Lullaby. Natsu accidentally unlocks his memories of his past as Etherious Natsu Dragneel AKA E.N.D and regain his Etherious Form as well as Curse(s). Also both of his personalities will clash to form a new one, a slightly more serious yet kind new personality that consists of both Natsu and E.N.D. Just a heads up Natsu will be Semi-Godlike so he will obviously be more powerful then the other S-Class mages of Fairy Tail and Makarov. Anyway, read and leave a comment of what you think. Also I like to thank fellow writers DD42 and Chrys Stone for their input. DD42 especially since my END will have seven curses besides just the fire curse. One of the other curses inspired by DD42's END story. Anyway, read and leave a comment of what you think.

(Clover Town, Nighttime)

Natsu would never admit it, but ever since he met Lucy back at Hargeon, there was always something about the busty blonde Celestial Spirit Mage that caught the attention of the Fire Dragon Slayer. He had no idea what it was to be honest, after all Natsu had met Lucy only a few weeks ago. Natsu at first claimed it was because she was now a member of the guild, and Natsu was protective of everyone in Fairy Tail. But this feeling he had towards Lucy was different from that, even the bond Natsu had with Happy didn't compare to what the Dragon Slayer felt towards Lucy.

These were the current thoughts running through Natsu's head as he watched the giant demon known as Lullaby launch its large fists towards Lucy. A few moments ago Natsu, Erza, and Gray had been knocked back by one of Lullaby's large arms. Natsu had managed to recover quicker then the others just as he watched the fist descend upon the Celestial Mage. The blonde was currently trying to help a wounded Kageyama, a member of the Dark Guild Eisenwald, the same dark guild that was responsible for the release of the demon upon Clover Town.

It was the same guild that had tried to kill her, Natsu, Happy, Gray and Erza in their insane attempt of 'justice' against the Legal Guilds. And despite that Lucy was still determined on helping the wounded former-enemy. Her kindness to all people, friends and enemies alike, was one of the few traits of Lucy that Natsu had actually admired. But right now it would be that trait that would get her killed.

"No, not again"

A voice suddenly spoke that only Natsu heard. At the moment time slowed down, everything else besides the voice and Lucy gaining Natsu's attention. He didn't know if it was someone else's or his own, but there was no denying the conviction and rage coming from it as the voice said these next words.

"She will not die!"

At that, Natsu knew that the voice was referring to Lucy. And Natsu agreed with the voice: He would not let her die! Not at the hands of some demon trash! With that, Natsu dashed forward with speed he never knew he had. His eyes blazing, turning from onyx to crimson red, Natsu let out an inhuman roar, "LUCY!"

What happened next was a blur. All noise had disappeared, as if falling silent in response what would transpire. Continuing his dash towards Lucy, who had just become aware of the large wood-like fist head towards her, Natsu raised his right arm outward. A glow appeared from his hand, but Natsu paid no attention to it, the look on his face was that of a man possessed. Nothing else mattered to him now, all Natsu could focus on was reaching Lucy, save her from certain death, and then kill this demon bastard for even trying to harm her.

As the fist was mere feet away from Lucy, it was suddenly severed from the arm, a single, clean cut visible. As Lullaby roared in agony, with its severed hand bouncing off somewhere nearby, Lucy took that moment to look up at her savior. She saw that it was none other then Natsu, standing in front, his back facing her. But it was then that she noticed that Natsu was carrying something in his right hand, a sword to be exact. It looked like a claymore with a red blade with runes carved onto it. Both the handle and hand-guard were of a blackened color and embedded in the center of the guard was in the shape of a demonic dragon's face with red gems for eyes. Finally at the bottom of the handle was the pommel, which was shaped like a five-pointed crown. Strapped to Natsu's back was a dark red scabbard, which Lucy assumed was for the sword.

"Natsu?" Lucy whispered as she helped up the now unconscious Kageyama.

The Dragon Slayer said nothing. Instead he raised the impressive sword upwards and then dashed off towards Lullaby. Said demon had finished howling in pain, its eyes glaring towards Natsu's form.

"You little shit! I'll kill you for that!" The demon roared as it thrust its remaining fist at Natsu.

But as the fist hit the ground, Natsu had disappeared from sight. Instantly reappearing on Lullaby's other arm, the one he had severed. The Dragon Slayer began running up the arm towards the demon's face. All the while gripping the sword with both hands.

Lullaby screeched in irritation at the pink haired person charging up its arm. "Damn pest!" It cursed as it quickly slammed its remaining hand down on top of Natsu.

"NATSU!" Lucy cried in horror as she watched what she believed to be Lullaby squashing Natsu like a bug. But that changed quickly when Lullaby's arm was cut in two from the elbow down. Now sporting a stumped left arm, Lullaby could only screech in more pain before something caught its eye. Hovering in mid air above the large demon was Natsu, the sword reared back, ready to deliver the killing blow.

It was at that moment that Lullaby saw something that made it know that its life was going to end. It wasn't the fact that it was missing both arms, nor was it the mage above it ready to finish it off. No it was the eyes that Natsu bore that sent a wave of fear and terror through Lullaby's body. They were a dark crimson color, like blood almost. But there was a powerful force behind them, an inferno that would burn everything in its path without hesitation. The eyes of something so horrible that it would even make a demon such as Lullaby cower in fear. Only two beings have ever made it feel such fear. One was the one who created Lullaby, the Dark Wizard Zeref, and the other was…

The runes on Natsu's sword began to glow fiercely, with the edges of the blade following suit. Tightening his grip around the blade's handle, Natsu said one word in a demonic voice, "Cremation"

The result was Natsu's sword cleaving the demon in half, right down the middle from the head to the groin. Lullaby didn't even have time to blink as its now halved body fell to the sides in sync. The body didn't even have time to hit the ground, as it slowly burned to ashes before being blown away by the wind. The spectators could only look with dumbfounded expressions at what Natsu had just done. With a single strike, he had killed the Mass Murder Curse Magic, Lullaby.

But none of that mattered to Natsu. As he stood up, sheathing the sword, the Dragon Slayer's sole focus was finding Lucy, being spurned on by the voice inside of him. However the surge of power he felt just now left him, leaving a fatigue body as Natsu began to slip to the realm of unconsciousness. As his eyes, having turned from crimson back to onyx began to close, the last thing Natsu saw was a blonde haired beauty sprinting towards him, with several other people behind her.

(Two Days Later, Era, Magic Council)

"Even with Eisenwald being dealt with, the main problem hasn't been solved yet." A member of the magic council said to his fellow members. They were currently discussing about the incident involving Eisenwald and Lullaby. "There are still many illegal and dangerous guilds out there."

"Then we should just root them out altogether!" Another member named Michello shouted. This one was rather short and had distinct cat-like features.

"And how would you propose we do that? We don't even know where they are." A member named Yajima said, an elderly man around the same height as the first one, with bushy grey eyebrows and beard. He also wore a three-spiked black hat over his baldhead.

"Either way, its intolerable to allow anyone to deal with Zeref's magic again." Another male council member, Org, said. This one was of normal height with a white beard and what looked like a bat on top of his head.

"How did Eisenwald even get their hands on Lullaby in the first place? It should've been locked up tight." A female member named Belno, asked.

"We may never know. We should relieve with the fact that the horrible artifact is destroyed." Yajima remarked.

"Yes, thanks to Fairy Tail, the guild that you're all annoyed with, who came in and saved the day." A young man with light blue hair and a red tattoo around his right eye spoke. "They managed to wipe out the entire dark guild with just four to five people when a company of Rune Knights couldn't." The other council members made a noise in annoyance at that fact. "I understand why you don't want to admit the truth, but that's how it is. In fact you should thank them and give them a reward or something." He added.

"Like hell we would!" Org remarked, slamming his fist on the round table. "Even though what you say is true, they also destroyed half a town! Do you have any idea how much it will cost to have Clover Town rebuilt?" The younger man chuckled in amusement. "Don't laugh Siegrain!"

"If it's bothering you so much, then why not send someone over to that annoying guild and confront the man responsible." Siegrain suggested.

"Man? I thought it was a group?" Belno asked.

"Yes, but most of the damage, as well as the destruction of Lullaby, was done by one person." Siegrain replied.

"Who?"

A screen in the center of the table popped up. It then revealed the image of a certain Dragon Slayer during his battle with Lullaby. It focused greatly on the part where Natsu showed to be carrying a sword up to the point where he cleaved the demon in half.

"Natsu Dragneel, also known by his alias Salamander, and is Fairy Tail's Fire Dragon Slayer. According to eyewitness accounts, Natsu managed to single-handily destroy Lullaby with that sword of his." Siegrain explained, while keeping a close eye on the said weapon. "I propose that Ultear should be our representative to visit this guild that annoys us so much."

"Why her?" Yajima asked.

"Because I volunteered to do so." A young, voluptuous, black haired woman sitting beside Siegrain said. "From the time I joined the council, all I have been hearing is how much of an annoyance Fairy Tail is. You cannot blame me for being curious of what they are really like." Ultear stated.

The other council members looked at one another, grumbling, before eventually coming to a decision. "Very well then! How long would it take you to reach their guild?"

"With my magic, no more then a few hours." Ultear replied.

"Alright, but we expect a full report of the guild and how they act, especially information of this Natsu Dragneel. A person who can kill a demon of Zeref with such ease is someone to be wary of." Org said.

"Very well" Ultear said as she took her leave of the council room, Siegrain right behind her. He had a smirk on his face as they left the room.

With the door close and the two now alone, Ultear looked at Siegrain. "So what do you think about Natsu Dragneel?" Ultear asked the blue haired young man.

"He is definitely someone to keep a close eye on. As Org said, killing one of Zeref's demons, even if it was one of his weaker ones, is no easy feat." Siegrain commented. "And that sword that he had especially caught my interest. Even though it was just an image, I could tell that it was powerful, and had a connection to Zeref." He added.

"Indeed" Ultear said in agreement before walking through Siegrain's hologram body. As she prepared for her short journey, her mind was still thinking. 'Even Master Hades has taken in interest in both the Dragon Slayer and that sword. I must try and get a better look at that blade. If what Master believes is true, Natsu may be the source to finding Lord Zeref, and to the creation of the Great Magical World.'

(Unknown Location)

"Wake up" A voice said to Natsu.

The Dragon Slayer didn't move. But after several more nudges to the cheek did Natsu begin to stir. With weary eyes, Natsu sat up, still getting the sleep out of him.

"Ugh" Natsu groaned. "Where am I?" He asked before he checked to make sure his scarf was still with him. Once doing so did Natsu finally notice that his surrounding area was…black? Total black surrounded him as far as the eye could see. As his senses began to wake up so did Natsu's realization of his current situation.

"What the hell?" Natsu cried as he got to his feet. He was scanning the room wildly, looking for an exit. But he could see none, or anything else for that matter. It was just an endless darkness.

"About time you woke up." Someone said from behind the Dragon Slayer.

Spinning around, Natsu found himself faced with a peculiar sight. The thing before him, he couldn't tell the gender, was entirely made out of flames, with wisps flying out every minute or two. It was around Natsu's height and at the top of its head were flames that looked like hair. Its eyes were completely black minus a pair of red dots in them. In fact upon closer inspection, the flame being looked like Natsu.

Natsu narrowed his eyes. "Who the hell are you? And where is this place?" Natsu demanded.

The flame being narrowed its eyes. "For your second question, we're currently in your mindscape. You're unconscious right now in the real world after using Ragnarok for the first time after so long." It said as an image of the sword Natsu had used to kill Lullaby appeared. Then it quickly disappeared as the flame being continued. "And as to who I am? I'm you, in a way. I'm your true you, the 'you' that was awoken after all this time."

Natsu raised an eyebrow, not understanding any of that. "You're me? What's that supposed to me? Wait! Are you Lullaby?! I bet you're that stinking demon trying to possess my body!" Natsu ranted, his mind going wild with theories. But he was silenced as the flame being's body flared up. It had an enraged look on its face, the red dots looking like tiny fireballs.

"I am not trying to possess you dumbass! Nor am I that pathetic excuse of a demon Lullaby! I, no we are above it, above all of Zeref's other demons!" The being said angrily to Natsu, clearly offended.

Natsu blinked, confused by something it said. "Wait what do you mean 'Zeref's other demons'? Are you trying to say-?"

Terrible realization struck Natsu like a punch to the gut. True he might not be the brightest light bulb around, but he wasn't that slow.

"Yes, we're just like them, but at the same time something more." The flame being said as he raised his left hand, the flames that made its body beginning to shift. Coming out of its fingertips, the flames soon spelled out a word 'END'. "Your true name is E.N.D, the first demon Zeref had ever created, and his strongest."

Now the feeling in Natsu felt like someone impaled his chest with a sword and he was only now feeling the pain. It couldn't be, he couldn't be a demon, like Lullaby. There was no way he could be anything else other then a human, not a demon. If that was the case then why didn't he have any memories of it at all? Why couldn't he remember something like that?

As if reading his thoughts, the being said, "The reason why you don't remember any of that is because 400 years ago, after the Flame Dragon King Igneel failed to kill you, your memories and demon powers were sealed away, and became a human. When I said that I was you in a way, I meant that I am the manifestation of those memories and powers that you lost. Right now you only a see a fraction of what you truly possessed, the part that was released when you're feelings for that Celestial Spirit Mage reached its peak." The being explained simply.

At that, Natsu's horrified feeling changed to embarrassment. A good shade of red covered his face as Natsu tried to deny that claim. "W-w-what!? I don't have any feelings for Lucy!" He retorted, though the flame being did not look convinced. "A-and even if I did by some chanced what does that have to do with you?"

"It has to do with me because your feelings for Lucy are exactly the same for the feelings you had with another woman 400 years ago, Leandra." The being said, catching Natsu by surprise. "Didn't you feel that sensation when you first laid eyes on her in Hargeon? Like she seemed familiar to you even though you just met her?" The being asked. "Those feelings broke the seal on your past self, which led to me being inside your subconscious. I am a manifestation of your memories of whom you once were."

Natsu paused as he took that all in. He couldn't deny that, when he first saw Lucy in Hargeon, something inside him clicked, as if he was having déjà vu. But Natsu would always push that aside, focusing on other things in order to ignore the feeling. Could it actually be possible that he had developed feelings for Lucy in a short time since they met? Igneel had once told him that a dragon's instincts would tell them immediately when they found their destined mate. But what if these feelings Natsu was beginning to develop were because of a lost memory? The name Leandra really did sound familiar to the Dragon Slayer for some reason.

"And so now, you have a choice." The being said.

Natsu blinked. "A…choice?"

"You can either accept your origins, and thus regain your memories and powers or…" The being leaned forward, his flame-like face right in front of Natsu's. "Or I take control and make sure what happened 400 years ago to Leandra does not happen to Lucy."

Natsu's eyes widened, before narrowing as he shot a glare at the flame being. "What? There's no way in hell I'm letting you take over my body! And there's no way I'm letting you get your hands on Lucy or my friends!"

The flame replica of him let out a low growl. "Did you not hear a word I said? Lucy is exactly like Leandra, in both appearance and personality wise. Hurting her is the last thing I would do. As for your friends, I could care less about their pathetic human lives. All humans, beside Leandra, are the same: bias, prejudice, arrogant and selfish creatures that care for no one but their own worthless selves. It's because of human ignorance and greed that Leandra died 400 years ago! I refuse to let it happen again, whether you agree to it or not!" He roared at Natsu. By then the being's body began to erupt in flames that turned into a dark crimson. His eyes were glowing much brighter, like suns about to go nova.

A bit startled by his double's outburst, Natsu took a moment to let that all in. At first he wanted to deny what the flame being said, that he was not a demon of Zeref. But what he said, about the strange feelings Natsu had for Lucy, made sense to him. It also dawn on Natsu that without this being, Lucy would've most certainly been killed by Lullaby. Natsu didn't know why but the thought of Lucy being dead sent a shiver of dread through the Dragon Slayer's body. This was also Natsu's chance to find out more about himself, to learn where he came from before being taken in by Igneel.

After what felt like forever Natsu finally spoke. "Fine, what do you need me to do?"

Satisfied with that answer, the being's body relaxed. The flames died down too as he spoke. "For now? Nothing, just do not tell anyone else about this, no matter what. I will handle with sorting out your memories. For your memories is the key to regaining your powers, and to help you understand your past." He said mysteriously.

Natsu merely nodded. At that moment the room they were in began to brighten. "Looks like its time for you to wake up." His double said before adding, his voice becoming serious once more. "And one more thing: The sword, Ragnarok. Don't let anyone take it from you. You'll find out soon enough."

Those were the last words Natsu heard before the light blinded him, followed by a faint voice saying his name.

(Real World)

"Nat…! Nat…su…!" A voice kept repeating.

Said person made a grunting noise and twitched his fingers a little. Slowly, Natsu's eyes cracked a bit, only to see light that instinctively made him shut his eyes again. When he opened them a second time, several pairs of familiar eyes looking down at him with concern greeted him. Natsu realized he was on one of the beds in the guild's infirmary.

"Natsu!" Happy's voice cried in delight. The blue cat had been sitting on his friend's stomach before moving off to allow Natsu to sit up. Natsu's senses were still a little blurry, but cleared up automatically when he spotted Lucy sitting beside his bed. His heart skipped a beat when she had a small smile of relief on her face.

"I'm so glad that-" Lucy's sentence was cut off when Natsu immediately pulled her in for a hug. The blonde mage let out an "Eep!" of surprise at the sudden action, her cheeks tinged with a bit of pink.

"Thank goodness you're safe." Natsu said into her ear. His voice held such relief and compassion that it caused Lucy's face to turn red. She promptly ignored the teasing look Happy was sending her way.

"Y-yeah, thanks to you…" Lucy stuttered quietly as she finally freed herself from Natsu's embrace. "You were out for the whole night back to Magnolia and all of yesterday too. We were starting to worry."

Natsu nodded, swing his legs over the bedside. He noted, to his relief, that his scarf was still wrapped around his neck. "So, what time is it now?" He asked.

"The morning actually. But the guild is pretty much alive with activity, as usual." Lucy said with an amuse voice. She then managed to change the subject. "By the way, you haven't let go of that sword ever since you defeated Lullaby." She noted.

Blinking, Natsu looked at his right hand. Indeed, there was Ragnarok, as the voice had called it, in its sheath with the strap held tightly in Natsu's hand. The words of his double still rang through his head. 'Don't let anyone take it away from you.' He wondered what importance this blade had besides it being forged for him. The way his double spoke, he made it sounded like holding onto this blade was some form of punishment.

"Er, yeah. Guess I just had a good grip on it." Natsu said softly, still examining the sword, but not pulling it out.

Lucy frowned a little at that. She was more curious then anything about the blade that Natsu used to save her life, and where it came from for that matter. But she could tell that he had no idea where it came from either, or that what it looked like to her. Besides, she didn't want to pester him after he just woke up.

"Well, I'm hungry!" Natsu said, breaking the silence. Slinging the sword onto his back, Natsu looked back at his friends. "I want to eat some of Mirajane's food!" He exclaimed with a grin.

"Mm" Lucy said with a smile. "I'm sure the others will be happy to see you awake." She added.

"Aye sir!" Happy said his signature phrase.

Natsu nodded and with a fanged grin he kicked open the infirmary door. However he had only meant to kick it open, not to kick it off its hinges. The moment Natsu's foot hit the door it blew off as if being shot from a cannon. It flew across the guildhall, miraculously not hitting anyone, before finally stopping against the wall on the opposite side.

There was a moment of silence. Everyone's eyes moved from the embedded door towards the infirmary. Standing at the entrance, leg still raised, was Natsu with a surprise look on his face. Behind him were a gapping Lucy and Happy.

After what felt like an eternity, Natsu smiled sheepishly. "Whoops, my bad." He said as he rubbed the back of his head.

The result was everyone cheering and laughing, welcoming back the now awake Dragon Slayer. Inside Natsu's mind however, his inner persona was staring at the event with a serious gaze. "Hmmm, looks like your physical prowess have already returned to what they were over 400 years ago." He said to Natsu.

"Jeez, you could've told me that sooner you know." Natsu remarked in his head as Erza and Gray approached him.

"Oi flame brain, are you already trying to tear down the guild after just getting up?" Gray asked mockingly, though you could tell that he was glad to see his rival up and about.

"Well I can't help it if I don't know my own strength." Natsu retorted before looking at Erza. "Erza, fight me!" Natsu demanded from the scarlet hair mage.

Erza smiled at the Dragon Slayer. "I'm glad to see that you're feeling well Natus." She said as she pulled Natsu's head into her armor chest. Surprisingly, Natsu made no sounds of pain. In fact, when he was released from Erza's grip, he looked perfectly fine. "But maybe you should eat something first, we can have our spar afterwards."

Natsu frowned. He felt really energized after that long nap. Despite what he had learned while being unconscious, Natsu still had a lot of pent up energy he wanted to release. "But I want to fight now damnit! I slept for all of yesterday and-." His ranting was soon cut off by Lucy's voice.

"Natsu, you should really eat something. You can't do much on an empty stomach." Lucy tried to reason with the Dragon Slayer.

At the sound of her voice, Natsu immediately stopped all complaints. "Okay, if you say so Luce." Natsu replied to the blonde with a smile, before bouncing off towards the bar to order something. He left behind three surprise mages and a cat.

Gray blinked as he watched Natsu devouring a large plate of meat, courtesy of Mirajane. The Ice mage turned to look at Erza and Lucy, both busty girls having similar surprise expressions on their faces. "You know I think this is the first time I've seen flame brain agree with someone without arguing." Gray commented.

Erza nodded. "Indeed, even I have trouble getting him to cooperate without him talking back." The scarlet mage turned to look at Lucy. "I wonder why he listened to you so easily?" She murmured while giving the blonde an intense gaze.

Unsure why herself, and a bit nervous with those brown eyes staring intensely at her, Lucy was about to respond when a certain blue cat spoke up. "It's because he liiiikes her!" Happy purred in his usual roll of the tongue.

"SHUT UP! STUPID CAT!" Lucy yelled in denial, face red from the cat's claim. While Gray cocked an eyebrow at that and Erza, having read several porn and romance novels, had gone off into her own little world about marriage due to those words.

Meanwhile, as the guild continued with its usual activities, Natsu eating food like a madman, and the rest of the team gathered together, the flame entity was watching everything through Natsu's inner world. The flame entity would shift his focus between Natsu and Lucy before finally focusing on Natsu.

"You have the same conviction you had 400 years ago." The being said to himself as he looked at Natsu. "I just hope you're ready to endure the memories of the past. For learning of one's own sin, is never a simple task. Especially when it comes to the person you love, Natsu." He added grimly.

End Chapter

And there's the first chapter! What do you think? And no this will not be a harem so don't ask! I for one am a NaLu fan and believe heavily that pairing is perfect for Natsu/END stories. Anyway, be sure to leave a review of what you think! I'll also be working on my other stories like "Prince of Fire" and "The Rise of Hell"

Wacko12