The Dragon Overlord…

By

Dark Dragen!

Summary: This story comes about as a reader of mine by the name of PhazonLordKaito, asked me if I could try my hand at doing a crossover between Fairy Tail and Overlord with Natsu as the Overlord. I thought about it and decided I would give it a try.

Alternate start from when the Strauss Siblings go on the S-Class: What if instead of Elfman telling Natsu that he can't because it was his as the man of the family to protect them, but Mirajane Strauss. Who tells Natsu he was too weak and dangerous to go with them, how with this, hearing a few things he didn't want to hear, the death of his childhood (and only) friend Lisanna and meeting a certain minion changes the future for one Natsu Dragneel.

Warnings: I don't know what is to come but here is some warnings to be on the safe side, Out of Character with many of the characters, Natsu/E.N.D, Female Zeref, Underage Sex, Smut/Lemons, Violence, Torture, Threesomes, Foursomes, Harem, and these are just the few things I can think you should suspect, and most likely there's going to be much more. This is going to be in time, a Dark and Evil Natsu and the things that come with this. This story is not for the light hearted, for children or those who are easily offended, if any of those three are you, please stop reading now.

Disclaimer: I would like to note that Fairy Tail was created by Hiro Mashima, and Overlord was developed by Triumph Studios and published by Codemasters. None of the characters other than the OCs that might appear in the story belong to me, I'm working in there sandbox to create this new story of mine.

Author's Note: As I said in the Summary, I was asked to do this story by PhazonLordKaito, I have no idea where this story is going to go, and/or if it is going to be around for long. I'm writing this to see if I can, and to take a break from Rise of Overlord Vulcan - Rewrite, when I need to do something different than Harry Potter.

I'll tell you now, I have no ideas how I'm going to write some of the items from Overlord into Fairy Tail, just like I don't know how I'm going write them into my Harry Potter story. So if you got any ideas, I would love to hear them as they'll help me out of a problem I have adding them in both stories.

Seeing this is the first Fairy Tail/Overlord crossover I have seen, I'm only going to put this under Fairy Tail until I get into a few chapters, and I get a few C2s and a few followers. Then I might put it under Fairy Tail/Overlord. So you know before people begin to complain, the some of the characters WILL be out of character, so be warned.

Prologue…

(Alternate Start.)

Our story begins in a world known as Earthland, where magic is real and in most parts and is commonly exchanged and plays a key part of in people's lives in one form or another. In this world there are those who use magic to earn money, these people are known as Mages. In this world, the Mages join various guilds, where they do jobs by requests to earn money. There are many guilds throughout the world of Earthland. And our story starts at a certain guild known as Fairy Tail, in the town called Magnolia Town with the population of sixty thousand inhabitants, and is a merchant city that has been prosperous in Magic since the ancient era. Magnolia Town is the part of the Kingdom of Fiore a neutral country that has a population of seventeen million.

The date is the 21st of June x782, and out in the back of Fairy Tail, we find a young pink haired man that looked like fifteen to sixteen years old, fighting with a blue flying cat. And these two were Natsu Dragneel and Happy: Natsu is a lean, muscular young man of average height with a slightly tan skin tone, black eyes, spiky pink-coloured hair, and has abnormal sharp canines; Natsu has a scar on the right side of his neck, hidden by his white scale-patterned scarf that he received from his adoptive father, Igneel.

Natsu's outfit was a sleeveless, gold trimmed, black waistcoat, that was open and untucked, exposing his bare chest, he also had a gold trimmed, black cloth around his waist that reaches his knees, held by a leather brown belt with an oval-shaped silver buckle, white knee-length trousers with black ribbon ties, a thick black wristband on his left wrist, and had black open-toed sandals.

Natsu was what they call a Dragon Slayer Mage, a Mage that can fight against and kill dragons. His father adoptive father, Igneel, was the one who taught him this Magic. The thing is, Igneel was in fact the King of the Fire Dragons. From what Natsu tells people, Igneel found him in a forest when he was just a child, and brought him up as his child and taught him to read and write, and taught him to use Fire Dragon Magic. But on the 7th of July x777, when Natsu was about nine years year, Igneel disappeared without a word, leaving Natsu to defend for himself.

With the only father he only knew, Natsu left on a quest to find Igneel, but was eventually found by the Guild Master of Fairy Tail: Makarov Dreyar. Natsu ended up joining Fairy Tail. Over time though there has been times if he made the right choice in joining Fairy Tail, as all apart for one person, Lisanna Strauss, believed that he was raised by a dragon and always made fun of him because of this, thinking he was lying. The biggest offender was Gray Fullbuster.

Whilst he might act like a fool, he wasn't, he only acted like one as it was easier and they left him alone. It all started with him unable to read the books in the guild and the town, Natsu had no idea why this was, as his father had taught him how to. Because of people thinking he couldn't read and write, and this made it so people believed that he was making up who Igneel was, and he was stupid and a fool that made things up.

That's where Erza Scarlet came into his life, as soon as she found out that he couldn't read or write, she took it upon herself to teach him. Saying that Igneel whoever he might really be, didn't teach young Natsu properly and said she would teach him everything that he needed to know. Natsu would have beaten her up for saying such a thing, but he learnt how strong she was the hard way and decided better not to. He told her straight that he didn't want to learn from her as she was too scary and wanted nothing to do with her, this seemed to be the wrong thing to say, as she dragged him away by his hair and forced him to learn everything he needed to learn within a few days. She wouldn't allow him to sleep at all, and only give him a few minutes to rest so he can eat and drink, and use the bathroom should he need it.

Sure it was helpful, but he vowed he would never learn anything from her again, she was a total bitch and didn't respect him. She only taught him as it seemed to be a challenge, and when she taught she didn't explain and forced the info into him. Natsu would preferred if she took time to teach him, maybe if she did, he would be more willing to learn. He just found that being a fool was much easier, as no one in the guild want to teach him, and being a fool was much more safer to his health than going to Erza for help.

Natsu only joined Fairy Tail because there was nowhere else to go, and he thought that in time he could make friends and find his father. But within a few months though, he was thinking about leaving, as people were making a fool of him, calling him stupid as he destroys things when he couldn't control his magic. It not that he didn't ask the others for help, but none of them was willing to help and there was no way in hell he was going to ask Erza help in training, he wanted to live through his training.

But before he could make up his mind up about leaving, the Strauss Siblings joined the guild and here he meet Lisanna, and her brother and sister, Elfman and Mirajane Strauss. Elfman was a bit of pussy, he was shy and weak, with his only real talent being for cooking, although he was caring too. Mirajane was gothic-looking girl, wearing revealing outfit matching the tomboyish personality. She was just as scary as Erza was.

Erza was a two faced bitch when Mirajane was around, Erza would go around telling people off for getting into fights and breaking the guild rules. But when she and Mirajane get into fights it seemed to be alright, and should anyone say something about it, they should look out.

Lisanna though was a cute little girl, caring and sweet with short, white hair and blue eyes. She wore a simple, pink dress paired with dark red shoes. She was the only one who truly believed in Natsu when he said that his father was a dragon. Maybe it was because of her sister, Mirajane, defeating a demon in her village and gaining its abilities and able to transform into the said demon, but she believed in the young pink haired boy, and Natsu was thankful for it.

And Lisanna was the reason that Natsu stayed at Fairy Tail, whilst the others made fun of him and think him as a fool, his first friend did not. Over the following months, Natsu learnt that the Strauss's parents shortly after Lisanna was born, killed by bandits. He also learnt that the Strauss Siblings were ran out of their old village when Mirajane gained the demon abilities after defending the village, and at the time the elder of the three had no control of her powers and looked deformed, looking between human and demon. Lisanna believed that the village was sacred that the demon within Mirajane would take over and attack the village, and so they were ran out of the village.

During the next few months before joining Fairy Tail, they travelled about never stopping in one place for too long because of Mirajane's looks, they would kick them out of the village or city they were in. Maybe because of this, and becoming a teenager that Mirajane became demonic gothic. Either way, they were found by the Guild Master of Fairy Tail, Makarov Dreyar, who helped Mirajane gain control of her powers and made her look human again, and allowed them to join Fairy Tail.

Lisanna informed Natsu in secret that she and her brother Elfman, was learning to become Take-Over Mages like her sister, so that she wouldn't feel alone.

As time passed, Lisanna and Natsu became close, and one day Natsu found Happy, thinking he was a dragon, Lisanna helped to raise Happy.

Happy was a small blue magical cat, with a white stomach. He has a rectangular head, with pink ears, big black eyes with small, thin eyebrows, and light blue cheek marks near to his tiny whiskers (two on each side of his face.) Happy has a triangular nose that leads to semi-round upper lips on the sides. Despite having no thumbs, Happy is able to hold things. He has a long, white-tipped tail; and the other parts of his tail are blue. He can use his tail to hold things with. Happy only wears a green backpack, where he keeps food and items that can be used in battle. This backpack also covers his green Guild Mark that is on his back.

As strange as it sounds, even with magic, Natsu found Harry a few years ago as an egg in the East Forest of Magnolia Town. At first Natsu thought it was a dragon egg, and wanted to hatch. Everyone apart for Lisanna laughed at him for this, telling him it couldn't be a dragon egg as dragons has been extinct for hundreds of years, Lisanna only one who thought it possible. Natsu believed that it was unlikely that the egg was a dragon, but he had hoped it was so he could prove to everyone that dragons were in fact real and so they would be more help in finding his father.

But it wasn't the case, after a week where Lisanna got Natsu to play family, him as the husband and her as the wife and the egg as their child, where they built their own straw home, the egg hatched. But instead of a dragon, to their shock a blue cat came out of the egg, a cat with white wings, which they later learnt could appear at the cat's will. After the was hatched, everyone seemed so happy and joyful at the cat being hatched that they called the cat Happy.

Over the years since Happy came into their lives, Lisanna and Natsu often played House with Lisanna as the wife and Natsu as the husband and Happy as their son. Lisanna often tease Natsu about getting married when they were older. But on the 21st of June x782 things changed for Natsu.

And then…

21st of June x782 - Back of Fairy Tail Guild:

Natsu and Happy was in the back of their Guild, fighting over the same old thing that they normally fought over: Fish. When Lisanna came over to the tree that the two were under, "Don't tell me my two favourite boys are fighting again."

"Oh hey Lisanna." Natsu said with a smile, happy to see his friend. Natsu didn't really explain it, but he had been having strange feelings towards Lisanna of late. Feeling of wanting to be closer to her, taking her as his, he had to wonder if it had to do with the Mating Session that his father told him about. He wished he had someone to talk about this, so he could understand what was going on with him.

"Mum, dad ate my whole fish, and he didn't ask me first." Happy said sweetly to Lisanna, trying to get Natsu into trouble again with Lisanna.

"Whenever I eat any fish, you say it is yours." Natsu told his best friend/son.

Before Lisanna could say anything, her brother and sister came into the area, and they heard Elfman say, "Come on Lisanna, we got to go, we got a job to do."

"Come on guys, we just got back from the last job, can't we take a short break before going on another?" Lisanna asked her siblings as Happy jump up happily as he saw Elfman and Mirajane.

"Yeah I know, but this is a S-Class job," Elfman explained to his sister, "but and Mirajane want us to come along and help her with it."

"No way, totally unfair" Natsu whined at this, he always wanted to go on a S-Class Missions, but no one would allow him to go. There was only two ways of going on a S-Class Missions, the first is to be asked by a S-Class Mage to come along, which none of the current S-Class Mages ever done with him. The other was to be a S-Class Mage, but even though he was there longer than the Strauss Siblings, he was never being picked to be a candidate.

"What kind of job is it?" Lisanna asked her brother and sister.

"An emergency quest that just came in," explained her sister, "they want us to kill off some monster called the Beast."

"Can we being Natsu come along with us?" Lisanna asked her family.

"I don't want the brat to come along," Mirajane told her sister with a smirk, "he is too weak and destructive. We do not need the likes of him in our group."

"If we showed him how to control his magic like he wants, he wouldn't be as destructive." Lisanna told her siblings, "And he is far from being weak, he is more powerful than both me and Elfman put together."

"You would say that we both know how you feel about him, but I don't care, this is my team and I don't want someone as destructive as him on my team." Mirajane told her sister who was turning red at what she said, both in anger and embarrassment, "Do you ever wonder why none of the guild want to train or work with him? He is a foolish kid who believes his father is a dragon, and is too weak and destructive."

"Yeah a man don't destroy things, and they don't not lie either like Natsu does." Elfman told his sister.

"In that case I don't want to go if that's how you feel about him." Lisanna told her family, sticking up for her crush.

"No go Lisanna," Natsu told his childhood friend, surprising her, more so as to what he said next, "they are your family and you should fight with them. Anyway, how often does a S-Class come along where you can go with your sister? No go with them, I don't want you to miss out from something like this."

Lisanna was surprised by Natsu's maturity, but smiled at it too, it proved to her that everyone was wrong about him. With a sad smile said, "Are you sure about this? I don't mind staying behind."

"No go ahead, I'll be fine," Natsu told her, "I'll be training so that I can become a S-Class myself. That way we can go whenever we want and we don't need them."

Lisanna smiled at this, knowing that her friend and crush would train as hard as he could, so that he could become a S-Class Mage so that he could go on S-Class Requests. "Thanks Natsu," Lisanna said with a smile, "when I return and have rested up, how about you, me and Happy go on a Request just the three of us?"

"I would like that Lisanna." Natsu told his friend, as they hugged each other and parted ways, never knowing this would the last time the three of them would see each other for a very long time.

And then…

28st of June x782 - Fairy Tail Guild Hall:

It has been about a week since the Strauss Siblings left to deal with The Beast. During this time Natsu tried to get some help to get stronger, someone who could help him to learn to control his magic. But none of the people he asked was bothered to help him out. That didn't mean he didn't train, he trained by himself, reading the few books he could find on controlling his magic. He wanted to become a candidate in the next S-Class Promotion Trial, so that he, Happy and Lisanna could go on one together. Some at the guild was shocked to see Natsu reading, as he rarely read anything that wasn't on the notice board for jobs.

As Natsu was reading a book, two of the three Strauss Siblings, both of them look as if they lost something. This is when he realized that Lisanna wasn't with them, seeing this Natsu stood up and went up to them and said worriedly, "Where's Lisanna? Why isn't she with you?"

The two of them didn't say anything, Natsu feared the worse, and said once again but more forcible, "Where is Lisanna!?"

"She, she's d-dead." the two of them said together.

"WHAT!? HOW!?" Natsu screamed in shock and horror, not believing that the person the only person who believed him, and didn't think he was foolish and stupid, and someone he was starting to think of more than a friend.

Elfman and Mirajane then told them what happened, how Elfman tried to take over The Beast, knowing he wasn't ready for a full Take-Over yet, and the beast took control of Elfman and going on a rampage. Upon hearing this, Natsu saw red, and attacked Elfman as he shouted at the male Take-Over Mage, "You fucking bastard you killed her, you killed your own sister."

"Get of him Natsu, stop acting like a bigger fool than you already are." one of his guild mates told him, as a group of the guild tried to take him off Elfman.

"He fucking killed Lisanna," screamed Natsu, as fire engulfed him, making those who was holding him back, to back off, "he killed the only friend I have in this guild, the only one who believed in, and the one that I cared about the most."

"It was a fucking accident!" Mirajane Strauss screamed at Natsu as she transformed into her Take-Over form the Satan Soul, to defend her brother. In this form her eyes, eyelashes, ears, and hair all change drastically, and dark, thin markings appear all over her body. Her forearms and hands become covered in scales, and each sprouts a fin-like protrusion on its outer side. She also grows a large, stocky tail, seemingly made of metal plates or scales. Her clothing also changes, with any attire she might be wearing being replaced by a dark, skimpy one-piece suit revealing her arms and legs, which is open on the front and the back, exposing most of her belly, wide cleavage and upper back too. She also dons a pair of gauntlets covering the back parts of her transformed arms. "He wasn't ready to use Full-Body Take-Over, and the monster took control, it could happen to anyone."

"And you fucking call me weak and stupid," Natsu spit at the Demon Take-Over Mage, his anger getting to him at the loss of his only friend, "I wasn't the one that done a spell I knew I wasn't ready to use, or at the most dangerous time to try it. At least I didn't kill anyone."

Here Natsu got a slap around the face by Erza , who said angrily, "How dare you say that you stupid brat?"

"I was told that I wasn't allowed to go because I was weak and destructive," Natsu cried with tears in his eyes, "but Mirajane took her siblings, even though Lisanna admitted that I should come with them as I was stronger than b

oth her and Elfman. Even though I might of destroyed a few buildings, at least Lisanna would still be here."

"Get out!" Erza shouted at the young Dragon Slayer, "And don't come back until you are ready to apologize to Mirajane and Elfman."

All around him, Natsu saw dark looks from the Guild Members, apart for Happy who was crying at the loss of his 'mother,' they too showed hatred at how he was treating the Strauss Siblings. What about him, he had lost Lisanna too, and they all knew how close to her he was and yet no one was comforting him, like they were with Strauss Siblings especially Elfman, the one responsible for the death of Lisanna. All he could see right then was hatred at Mirajane and Elfman.

"Fine I'll leave, but know this, I'll never return as I'll never apologise to them, especially, Elfman, as he is the one who killed my Lisanna." Natsu spit at the Guild before he left.

Little did they knew it at the time, but that was the moment that would change their lives for and for Fairy Tail, not for the better. As many of them thought that Natsu would be back in a few days, with his tail behind him and apologising to everyone for the way he acted like he normally would. But this time would be different, as for a few years they would not see Natsu, as soon he would meet someone who'll change his life forever and give him something he always wanted training and the ability to control him. Not only that, but he would find some home truths that he never knew about.

To be Continued!

Author's Note: Here ends the first chapter of my new story, I hope you all enjoyed it, as this is my first non-Harry Potter story and feel a bit uncomfortable about it. As I said at the start, I have no idea what I'm going to do in this story, so any and all ideas are welcomed, more the merrier.

Please know that any flames will be ignored, any guests reviews that aren't useful to make the story better, will be deleted!

Anyway, to help me with this story, I'm looking for a Co-Writer/Beta Reader to write this story, I want someone to talk to about ideas and suggestions about the part I'm writing and how to make it better. If you're only want to be a Beta Reader, I'm looking someone who is willing to alter things to make it better, even if it means deleting or rewriting it, or adding things to it. parts of it. So if you are interested, and you are a fan of Fairy Tail, knowing a lot of it, please leave a review or PM me.

Either thank you for reading this story, and I hope you'll leave a review letting me know what you think. As I would like your thoughts about my first ever Fairy Tail story, be it bad or good, so please leave a good length review. One thing I'm looking for are ideas for new Overlord Items, and how to add them. I hope you can help me out.