Demon King's Lewd Son: Awakened by the Nephilim System!

Millenniums ago, there was a prophecy that foretold the end of the world through the resurrection of the Demon King.

The gates of hell have been shut for as long as mankind existed but there was a mysterious crack one day.

A crack small enough to let the lesser demons roam the face of earth but eventually, that crack only got wider.

Humanity had no way to combat against these creatures but the Church did in the form of hunters.

They trained some of the most powerful warriors to fight a battle that waged for centuries to come.

However, the more demons they sent back, the bigger the crack became.

This allowed the Demon King to send 1/100 of his essence into the human world and find a vessel for him to inhabit.

This vessel was non-other than one of the hunters who fought his legion, Luke.

There was no vessel on earth strong enough to contain him but this vessel managed to contain him for two days without breaking, a surprise to Demon King.

The Demon King proceeded to mate with the hunter's wife before the Hunter ejected him from his body with sheer willpower.

The church managed to send him back to hell but this time, they closed the gates permanently with an ancient artifact once thought to be lost, The Sevenfold Seal with seven keys placed in each continent.

But there was a problem, Luke's wife was pregnant and it was twins but who was the father of these children- him or the Demon King?

There was two placenta; one child belonged to him and the other belonged to the Demon King.

But his wife asked him to make her a promise, he would protect BOTH of his children.

However, would he betray the church to protect his children?

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The system would come a lot later into the story so bear with me but this story would feature a lot of mythical creatures from different ideologies.

Smut will be present as well but there would be no NTR whatsoever.

The system, as is obvious, will change a lot of things when awakened.

Oh right, there will be smut!