Trinity of Magic - Chapter 34: The Baumgarten Underground Empire IV.

Born as the fifth son of a Duke, Rex Grimes. Though he was the youngest, he was the toughest contender to the first son of the Grimes, the hope of the Grimes also titled as once in a millennium genius.Will he be able to fight his way out. Maybe not.Facing an unfortunate accident in which he lost all of his cultivation. All his hopes and dreams were lost.{The train has arrived at Valmere Valley}Deciding to go back to his childhood warmth. Rest was the best cure but it seems that there was still a way for him.[Gacha Wheel][Insufficient points]'How do I gain points'[Please Get wives and practice the art of love and creation of life][Only Ying and Yang will give birth the to creation of points]

With his engagement at hand, the most terrifying and legendary person of the legal world, Fu Huai’an, returns with a son.

Before the engagement…

He asks, “Since you love Wen Moshen, why are you in my bed?”
She says, “Because I cannot watch idly as Wen Moshen’s woman enters an engagement with you.”

With a cigarette in Fu Huai’an’s mouth, he crosses his legs. Across the light cloud of smoke, he squints his eyes—watching as Lin Nuan’s slim arms wrap around his neck; he feels stirred.

So a person can love another so passionately.

“You call what you did a kiss?”
“…”
“What a pure lady!”

Fu Huai’an spews out a cloud of smoke and snuffs out the cigarette. With a mellow voice, he says, “Let me teach you what kissing is!”

But, what he teaches Lin Nuan doesn’t seem to be only a kiss…

- Description from Novelupdates

There are a total of seven sins, and a revelation is made to a young man named Alex that he is destined to become a demon lord, more especially a demon lord of sin called LUST.

It's not like he can change that and because he always knew something about himself was different—not in a physical sense, well, maybe a little—and not in a mental sense—but rather because he is thrown into a demonic war that compels him to accept his new reality.

He was only aware of a difference in himself. Relating to him and the ladies who are drawn to him... Well, it was more or less like he was a magnet in front of all the girls, and all the girls were drawn to him like a metal.

Intelligence without ambition is like a bird without wings.