Fairy Tail: Lost One - Chapter 16: Tainted Waters

Heed my call! O’ Dragon of Eternal Sin, the Progressive Disaster, the Forerunner, the Land of Eternal Peace, the Flames of Soul Burning, He Who Owns The Deep Soul, the Sound of Origin, the First Cause of All Things, the Principle of Circles… o’ great Negary, your servant calls for your return!

He rose from abjection and achieved eternity in glory.
He embraced the prettiest beauties and killed the strongest opponents.
He was able to shift the clouds into rain and cover the sky with one hand.
He could overrun the entire world and go anywhere as he pleased.
He pacified wars and held the world in awe.
He was matchless in the world.
However, his hair turned white overnight for his beloved woman and he was on the verge of death.
He was surrounded by enemies who were trying to take his life.
He struggled his way to become mighty and fought for everything he cherished.
For this age, he was the only king of the Dark World.
His name was a byword for might.
As a man living in the world, his only ideal was to pursue brilliance.

- Description from Novelupdates

She had never expected that she would slept with her deadly enemy,but it turned out to be a good match for both of them.

while after marriage ,his indifference finally angered her.

You damn bastard!

“Lin Yunfeng! Stop right there!”Lin Yunfeng gazed back at the speeding figure behind him. Heart racing, he picked up speed and ran through the abandoned corridor.“You better stop Yunfeng!!” Ren Muchen growled loudly. The little brat was much faster than he had expected. “This is how you wish to face me after you fucking slept with me? Fine! Run then! Let’s see how long you can last,”Panting Lin Yunfeng looked back in panic. “I’m so sorry, it was a mistake. think of it as Stepping on shit. Please forgive me!” he placed a hand on his lower stomach and ran even faster.“Watch out!”Yunfeng gazed ahead in surprise. a half-rotten corpse stood in his way. He came to a screeching halt but the slippery floor made it hard for him to come to a complete stop.He fell unceremoniously face down on the ground. “Fuck,”The zombie jumped onto him with its mouth wide open. Its bloody saliva dripped onto his face.Yunfeng held his breath. He had read about this before but this was the first time he had actually seen an undead. It petrified him. ‘Is this how I die?’“Growl,” the beast aimed at his neck precisely,Just as he thought his life was coming to an end, a long axe cut through the decayed neck of the Zombie.The heavy zombie fell right on top of him, oozing blood and puss.A hand grabbed him by his collar and lifted him up. “You are not dying, not today, not anytime soon...” Ren Muchen said with a nasty grin/Yunfeng gulped.Muchen peered into his trembling black eyes coldly. “You know why?” because we are having a baby.”Yunfeng’s hand reflectively went into his tummy. “h-how do you know?”“You knew?! Yet you ran!” Muchen laughed coldly and shook him like a rattle. “Take responsibility you bastard, we created a life that day!“y-yes, I’ll take responsibility!”