MTL - The Villain is Born with a Sweet Tooth - Chapter 36

After a tear in reality pulls Kagari Shuya into a white room he discovers a futuristic interface for reincarnating in a different world. After looking through the different races and skills he unlocks a new race, Lucivault, a type of vampire with none of its characteristic weaknesses. All set to start his life in a new world, Shuya is confused to discover that he is enveloped in darkness. As it turns out something went wrong when he was transported and instead of appearing where he was supposed to, he appeared in an underground cave. Shuya faces untold dangers, runs for his life, before finding his way out of the underground world. After escaping he meets his Shishou and begins to learn to fight with a spear. There is also a cute black cat named Rollo.

A new emperor rules each year in Yohuachanca.Only the most delicious of food graces his palate; the realm’s most beautiful women fill his harem; his palace dazzles the mind in its beauty; and four priestesses counsel him in all matters. The life of an emperor is good, luxurious, and short. For at the year’s end, he is sacrificed to the Nightlords under the light of the Scarlet Moon.I am Iztac. A pisspoor orphan and the year’s emperor. A sacrifice bound for the altar. But the vampires have made a mistake this time. For I am a sorcerer, whose soul journeys into the secret underworld to plunder the secret spells of the dead. There, in the darkness, hides the power to drag the Nightlords off their throne. I have a year to find it, or perish for good.I may not be the first emperor, but I will be the last.

(Chongwen, strong men and women) On the wedding day, her husband stabbed the knife of betrayal into her heart with his own hands,

“Did you know? The person who saved you back then was not me, but the sick child who first asked Tian!”

Only then did she know that she had been in love with the wrong person!
In the raging fire, she vowed like a ghost:

“Sikong Hao, I swear to God that if there is an afterlife, I will seize your imperial power and destroy your country!”

Opening her eyes again, she found that she was actually reborn on the body of Bei Gongxue, the number one waste material of the Bei Gong family.

Clenching her fists, she hooked her lips and sneered: This time, she will not be blind and love others wrongly.

To the person who harmed her, she directly tramples on it, and to the person who loves her, she swears to protect her to the death, and she will never let him suffer any more grievances!

When the waste material turns over, when the sick king no longer hides his strength, their love is destined to be vigorous, so that the world can only look up!

But when the world said that Princess Xuan was arrogant and ruthless, and her wrist was bloody, he said: “My love is the biggest capital of your arrogance and domineering!”

- Description from novelbuddy

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.