MTL - Princess Medical Doctor - ~ 930 ran the road and took another prince

After slumbering for years in the darkest pits of the abyss, Haruki Shin is awoken by the demon lord of lust. She tries to remind him of a contract he signed with her in exchange for the power that would help him exact his revenge in the mortal world.

However, who or what he wanted to get revenge on? He couldn’t remember. Replaced with a hazy mist, his memories had long since faded. But to the mistress of lust that didn’t matter as she forced him back into the mortal world with the demonic body of an incubus.

Feeling lost he’s forced to adhere to each of her commands, and despite his refusal, he can’t resist the binds of the contract. Eventually, however, as he learns more about his tragic past, and the existence of the lustful system he’s been blessed with for his revenge, his path to becoming a monster finally begins.

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Kyros Steele was the strongest warrior in the Omega Kingdom. But when the Great War of All began, this kingdom fell. Kyros was captured.

Destined to become a slave through necromancy, Kyros could only curse at his led bitter life.

But on his final moments, he meets an eccentric Old Man who claimed to be the God of Time.

Much like Kyros, this Old Man was fated for suffering and defeat. Because the God of Time could not be killed, the Great Gods conspired to curse him and make him human first. And so the God of Time escaped but was now human. Even if he used his powerful magic to send his consciousness back in time, he would still be defeated, for his soul was no longer a god but a man.

Helpless as his time-traveling rebirth would easily fail, the God of Time offers and asks for Kyros's help. He would send Kyros back along with his own consciousness back in time. This would hide the God of Time from his enemies and give Kyros the chance to fulfill his revenge.

Just when the two were about to time travel, a shocking mystery caused the God of Time to marvel in awe. Kyros was not a human but had the bloodline of the most accursed and dangerous race of all.

Kyros is the legendary Nephilim.

And so begins the Ascension of the Nephilim.

He died on the wedding of the girl he had a crush on, after a long and successful career. After convincing Yama to send him back to the world, he decides to fix the areas in which his life went wrong. Realizing the lack of love and romance in his past life, he sets out to conquer the hearts of various women.

Zavier met Cosmic Consciousness after his death. He was satisfied with every system that Cosmic Consciousness exhibited, so he wanted all of them. Surprisingly, the Cosmic Consciousness obliged him.

Zavier was reborn in an isekai full of magic and alchemy. Now, he had many routes to upgrade. Interestingly, to coordinate these systems, Cosmic Consciousness gave him the gift of being able to duplicate himself. He could clone a finite number of himself to manipulate these systems.

Magus, Alchemist, Mesmer, Tamer, Hunter, Vampire, Werewolf, Dragonknight, Necromancer.....

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By the way, it wouldn't appear NTR or some bullshit harem of courtships. MC of course will have harem but not for cliches.