AN: This story is rated M for a reason
Pride goeth before destruction, and an haughty spirit before a fall. Proverbs 16:18
"It's just not fair!" was loudly proclaimed throughout the Namikaze household.
"I'm sorry Naruto you just don't have the chakra reserves Mito has and besides her jinchuriki status makes her a target in the upcoming Chunin Exams," Kushina explained to her wroth son.
"But obviously the Hokage's firstborn son is totally expendable."
"That's not what I-"
"I. Do. Not. Care."
That ended things, at least for Naruto; he stomped up a flight stairs, grabbed some gear and went back down.
"Naruto where are you going?"
"Training," he grunted. Indeed with a celerity only a boy in desperate need of letting off steam could manage he made his way to the Training Ground 3. He made some basic clones with the appearance of his family for use in target practice. After an unproductive half hour of kunai throwing he was mostly cooled off. "Still how I'm gonna defeat Mito now that she signed the Toad Contract?" he muttered to himself.
"Perhaps I can be of assistance."
Minato was bored, oh so very bored. Paperwork was always dull especially when it was this close to quitting time. He glanced at the clock, noticed the time, and let out a sigh of relief. He got up and walked out of his office informed his secretary of his departure and with a flash teleported to his home. He announced his arrival with a shout "Honey I'm home!" He walked to the alluring smell of cooking dinner; he greeted his wife by grabbing her from behind, spinning her around and giving her a kiss.
Kushina reciprocated the kiss and whispered "Good you're home just in time for dinner."
"Daddy!" came the squeal of a young girl as she ran to her father.
He responded by hoisting her up into his arms "How was your day Hime?" While his youngest told him of her day (which was spent at the academy) he noticed the entire family save one had assembled. There was Mito slumped at the table, exhausted from summoning training. Across from her sat Taichi who was hard at work on whatever the academy had assigned him though the dislike of the work shone through his eyes. 'Like father like son,' Minato thought to himself. His wife was next to him cooking ramen, yet again. His youngest was still in the arms which left his eldest who was conspicuously missing. He inquired as to the whereabouts of Naruto to his wife
"I don't know, he stormed off to train after I told him Mito signed the toad contract," Kushina answered.
Minato sighed, he feared this would happen.
"Is Naruto going to be alright?" came the voice of his youngest.
"Don't worry Hime he'll be fine." he then put her back down on the floor "Now go sit at the table, dinner will be ready in a little." He turned to his wife and said "I worried this was going to happen. Just give him the space he needs and he'll come around eventually." He left for the table to ask his other children about their day.
"Perhaps I can be of assistance."
Naruto jumped at this, he turned around while unsheathing a kunai and began to examine the interloper. The inhumanity of the person standing before him was apparent; two large bat like wings jutted out of the back of the man, if he could be called that. The face was highly angled like that of a sculpture and contained no facial hair. The hair he did was black and curly which complemented his black as coal eyes. He was clothed with a tunic covered by a bronze breast plate that was engraved with a goat's head inside an inverted pentagram. "Who-What are you?" Despite his best attempts fear was evident in his voice.
"Some call me 'The God of this World' others call me 'The Devil' others still call me 'The Dragon' but you may call me Lucifer. As to what I am, I'm what you can call a demon."
"A demon like the Kyubi?" Lucifer's face twisted in disgust
"No I'm not one of those pathetic Biju, no I'm something far greater. Which brings me to you Naurto Namikaze, what is it that drives you? Is it lust? No the women you know are all pathetic in their own way. Is it mammon? No your family has all the wealth you could ever want. Is it envy? Yes it is, it is the envy of wanting the training and attention your parents and Jiraiya heap upon your sister Mito Namikaze. In fact does the village not regard her as a hero and you just another child of the Hokage? What about your brother Taichi Namikaze, I know the quiet looks of pride your father gives him fill you envy. It is envy of your sister Rin Namikaze being the apple of your father's eye and his hime. Sure your family loves you but not as much as they love each other and that drives you insane."
Naruto's sullen face confirmed everything Lucifer had said.
"Do not worry for I have the answer to your envy. Baal Berith!"
Suddenly a portal to a nightmare land opened up and spat out another demon. This was one was mounted on a large red horse. The saddle he was using was made of human bones and what appeared to be sinew. Naruto shivered at the thought of it being human as well. In addition to the horse he was dressed in red, a cloak to be precise. It was hard to tell but he appeared have armor under the cloak. A crown topped Ball Berith's head. He held a lance in one hand and tucked in the other was a scroll.
"This is my secretary and archivist Baal Berith and he has in his possession a contract. A contract similar to your sister's it, like hers will allow you to summon demons and grants you other powers."
Baal Berith dismounted and handed the scroll to Naruto who began to read it. The scroll was written in blood in addition to being written in two languages, his own and one he has never seen before. The scroll read:
"Nos septem principes inferni, Lucifer, Maximo ducem superbiae ac principem inferni, Mammonae Princeps cupiditas, nomine Asmodeus Princeps Luxuria, Leviathan principem quam invidi cuiuspiam Beelzebub principe Gula Satana Princeps ira, Belphegor Princeps acedia, hodie habemus acceptum pactum foederis Naruto Namikaze qui nobis. Sed hoc polliceor ei facultas convocandi daemones daemonibus facultate recipiendi facultas accersere sibi vincire et familiares, ut plenius conformaretur facultas quaedam postulata humanitas fudit demonhood ascendere. In commutationem Naruto Namikaze, vendet animam suam agnoscunt Lucifer quasi dominum suum proprium dominum, et in adiutorium nostrum in nobis aeternum bellum cum Melech Malchei Ha-M'lachim
Constitutam legem,
Lucifer, Mammon, Asmodeus, Leviathan, Beelzebub, Satan, Belphegor,
Baal Berith, scriptori.
We the seven princes of Hell, Lucifer, Grand Prince of Pride and ruler of Hell, Mammon Prince of Greed, Asmodeus Prince of Lust, Leviathan Prince of Envy, Beelzebub Prince of Gluttony, Satan, Prince of Wrath, Belphegor Prince of Sloth, have today accepted the covenant pact of Naruto Namikaze, who is ours. We hereby promise him the ability to summon demons, the ability to receive demonic powers, the ability to summon and bind to himself a familiar, and upon the completion of certain requirements the ability to shed his humanity and ascend to demonhood. In exchange Naruto Namikaze, shall sell his soul to Lucifer, acknowledge Lucifer as his lord and master, and shall assist us in our eternal war with Melech Malchei Ha-M'lachim
Signed, Lucifer, Mammon, Asmodeus, Leviathan, Beelzebub, Satan, Belphegor,
Baal Berith, writer."
One clause in particular attracted Naruto's attention and upon reading it several times he exclaimed "You want my soul!"
"Why yes, nothing in life comes for free and I need payment for all that I'm giving you. Besides soul selling is not as uncommon in this village you think. In a way your father sold your sister's soul to the Kyubi. Did the Sandaime sell his soul to the Shinigami? Yes he did. If the Sandaime can sell his soul to the Shinigami and die a martyr you can sell your soul to me and live a hero."
Naruto could not disagree with Lucifer's logic. He figured that while Lucifer and his demons were clearly malevolent it couldn't be worse than being the jinchuriki of the Kyubi, plus the ability to receive powers and summon a familiar had it's perks. Naruto sighed, mulled it over in his head and said "How do I sign?"
Baal Berith spoke up "You must sign using your own blood."
Lucifer conjured up a pen and handed it to Naruto. Using the kunai he had unsheathed earlier he slit his right wrist which began to bleed. He hissed once then again when he dabbed the pen into the wound. He signed the contract, once the deed was done he held out the scroll; to his surprise Baal Berith grabbed it and sealed it with a ring on one of his finger. Baal Berith intoned "It is done."
Lucifer replied "Good, now Naruto I will not lie but this will hurt greatly."
"What wil-" at that moment Naruto found he could not speak and he looked at Lucifer for explanation he saw to his horror, Lucifer conjuring a red hot brand. When he tried to get out of the way he found that he was frozen in his place. With one hand Lucifer tore off Naruto's shirt and with the brand in his other hand touched the brand against his left pec. The pain was horrible, the worst he had ever felt in his life. He tried with all his might to scream though he could not, he couldn't even grimace. After what seemed like eternity the brand was lifted from his skin and the pain immediately stopped. Whatever power held him in place and paralyzed him was released and Naruto dropped to one knee while dropping the kunai. He looked down and saw the number 666 branded on him.
Panting he stood up and looked at his new lord and master who stated "Now that unpleasant business is concluded we can move on to more congenial subjects. Like this tome I shall gift you "
Baal Berith took a large book from a satchel on his saddle and handed it to Naruto. He looked at the cover which depicted the same inverted pentagram with a goat's head as Lucifer's breast plate. Naruto opened it and flipped to a random page. To his dismay he found the text in the same alien language as the first half of the contract.
"How am I supposed to read this?"
Lucifer answered "Summon Agares and he shall teach you the language"
Baal Berith interjected "Ah Agares, duke, for a price he will catch runaways and deserters. He also knows every language ever spoken by humankind and will teach you the necessary language for your needs. As Keeper of the Privy Seal of Lucifer he has the power to grant hellish titles to the worthy."
Naurto smiled and thought 'that solves that, though I need to figure how to summon him in the first place.'
Lucifer chose that moment to speak "Before we leave I have last gift to give you, it is called exsanguis terreat vitae"
"It's called wh-"
Before Naruto could finish his sentence, Lucifer using superhuman speed grabbed the bloody kunai off the ground and stabbed Naruto in the jugular. Rapidly losing blood Naruto collapsed to ground, the last thing he saw before fainting was Lucifer and Baal Berith leaving via portal.
When Naruto came to he briefly wondered what happened however with a grimace he remembered why he fainted. 'It seems Lucifer enjoys harming his new...' At that moment the weight of signing the contract hit him 'I guess I'm his servant and he is my lord in addition to owning my soul. I'm not sure where my loyalty to the village fits into this but given they don't own my soul I suspect my loyalty is to Lucifer first and the village second.' Naruto gazed up to the sky which at this point was filled with stars and the moon. 'Looks like I've been unconscious for some time, I better get going soon before my family worries'. Naruto stood up and began looking around for the tome Lucifer granted him. He found it lying at the edge of a rather large pool of blood, his blood to be precise. 'How am I still alive? I didn't even know I had that much blood.' He looked at his hands which even in pale moonlight he could tell were ashen. A theory popped up in his head. A theory that would in normal circumstances be insane. 'Well it's worth a try' he thought as grabbed the kunai that by now had stabbed him twice. Gritting his teeth he slit his wrist and nothing. No blood had exsanguinated from his wound. To confirm his findings he slit the other wrist, the result was the same. To finally and totally confirm his theory he dropped his pants and stabbed himself in close approximation to his femoral artery. No blood. 'That settles that, I have not a single drop of blood in my entire body. This must be the last gift Lucifer was talking about.' Grabbing the tome he left Training Ground 3 and headed back to the village. Despite his bloodless and soul selling state the seals that protected the Namikaze household still recognized him so he snuck in. The house was silent 'Good ,I don't want to have to deal with explaining my absence.' He made his way to his room and collapsed on the bed. 'Tomorrow I will summon Agares and get started on that book' were his last thoughts before sleep overtook him.
AN: And so it begins.