Descendant of Sin

none of seven deadly sins or Naruto is owned by me

Summary

Naruto is the descendant of Meliodas and Elizabeth and he due to the stress of his earlier years of life and being the host of the Kyuubi he reawakens the demons darkness.

Naruto stared blankly at his chest which sported a new addition or rather a few two of these additions were in the form of knife wounds and the third a knife set deep in between his ribs it hurt but for some reason it felt far away and when a boot smashed into his head he lost consciousness only to wake up in a dark and dank sewer.

Naruto at first was afraid but after a few minutes he got up and began to wonder and after a while he came across and odd sight another blond stood in front of a giant cage seemingly talking to something within the cage only to turn to Naruto as he approached.

"Hi there kid." said Meliodas as he gave a small smile and a wave Naruto cautiously gave a wave back before responding.

"H-hi do you know where we are?" asked Naruto as he got closer Meliodas shook his head lightly.

"As far as I can tell we are in an illusion or mind type magic." replied Meliodas as he playfully rubbed the back of his head.

"Magic?" asked Naruto his hesitation gone and in its place was confusion Meliodas also gained a confused look at Naruto's reaction before a look of realization crossed his face and he snapped his fingers.

"Oh yeah its called chakra now isn't it… man its changed a lot hasn't it, it used to be a lot more developed I guess." stated Meliodas.

Naruto looked on confused earning a chuckle from Meliodas "Sorry for rambling anyway chakra as you call it was once known as Magic however how human's body take in/produce this energy has changed but for whatever reason you awoke my blood."

Naruto tilted his head in confusion and asked "I woke up your blood?"

Meliodas laughed at that but a growl broke said laugh as it rumbled from within the cage before a voice deep and demonic exited the cage followed by a set of deep red eyes "He means that you have awakened his bloodline." the words were tinged with annoyance and anger.

Meliodas smiled and turned to face Naruto whom jumped back several feet at the eyes and voice before pointing at the cage and its tenant with his thumb "Oh yeah I meet your little passenger here."

Said passenger roared its response "I am not little nor am I a passenger I am the great nine tails the greatest of the tailed beast and ruler of demons!"

Meliodas chuckled again and shook his head before replying "You are a mass of chakra and I can tell this much you have never been to the demon realm so no you aren't the ruler of any demons."

The nine tails attempted to reply but Meliodas blasted it with his killer intent and killed the words in its throat before speaking again "Now I would like to talk with the shorty here."

Naruto instantly bristled and forgot his fear of the giant eyes and rushed forward stopping just short of Meliodas "I am not a shorty!"

Meliodas snickered and patted Naruto's head before replying "Yeah yeah but fuzz butt back there is correct that's the closest that I can get to a good example for this."

Naruto's eyes light up and his excited reply was all Meliodas needed to see before smile broke his face and he patted Naruto's head "It is largely instinctual but with time you will be able to control it and make weapons or complex structures with it."

Naruto calmed a little "You called the bloodline it, is that its name?"

Meliodas shook his head "No its name is darkness and it's something unique to demons."

Naruto froze and looked to Meliodas "D-demons?" Naruto's ancestor simple nodded.

"Yes I am the son of last demon king and my brothers are dead and my father is locked away in the demon realm." stated Meliodas.

Naruto looked at his hands quietly "So I have demon blood in me?"

Meliodas held up his hand and put his forefinger and thumb close together "About this much is what would be in you if it wasn't for your life as it is which has inflamed the demonic part of your blood and as it stands currently 99% of your blood is demonic so it would stand to reason that you would awaken and since I knew it was a possibility that at least one of my descendants would awaken so I ingrained a bit of my consciousness in my blood so if such a thing would happen I would be able to help teach them at least a little."

"But I am a demon I am a monster!" yelled Naruto tears spilling from his eyes earning a raised eyebrow from Meliodas before the boy before he continued "Every time they hurt me called me a demon I deserved it because I-" Naruto stopped speaking and held his head as Meliodas smacked the top of Naruto's head.

"Hey Naruto calm down look at me I am a demon and I am pretty cool right?" asked Meliodas pointing to himself earning another nod from Naruto "Well then all demons aren't that bad then are they?" Naruto gave another nod.

Suddenly Meliodas' hand began to disappear breaking down into dark particles which fell into the water below his feet "Oh it appears that I am out of time…when you wake up you will go into a berserker state so be prepared also for transformations with the darkness use your imagination." as Meliodas spoke his body began to break down faster his feet also started breaking down.

Naruto started to panic but Meliodas calmed him with a smile and patted his head one more time "Make me proud shorty."

Naruto could only watch as Meliodas faded and into nothing unaware of his own body changing as it made the final plunge into 100% his iris became entirely black minus the purple that tinged edges of said iris and his whisker marks glowed a dark purple and his arms and legs became covered in a purple glowing black mass that covered the entirety of the boy's appendages.

Suddenly Naruto was in the real world and he could see the boot coming down at him again and suddenly he was hit with mind numbing rage and in that moment the darkness covered his limbs and his and formed massive clawed appendages and he lunged digging his massive hand into his attacker's chest.

And cut