Surviving as a Mage in a Magic Academy - Chapter 68

An 18-year-old poor college student tried to apply for a job as a tutor but his life almost ended as demons' meal. In his last breath, a mysterious woman gave him a strange power. When he opened his eyes he had turned into a demon with a system that would turn him into… A pervert.

Now he must lived with his dual identity as a model student named Ethan and an incubus named Damian.

Standing before you are:

Guardian and patron of darkness,

Disruptors and Reshapers of Order,

creator and persecutor of licking dogs,

The tea master, the goddess of the dark night, the nightmares and gravediggers of the gods,

The true ancestor of blood – Charlotte de Castel.

With madness, with blood, with curse, with destruction.

This is a legend belonging to the blood family…

- Description from novelbuddy

On their wedding night, she gnashed her teeth, yelling, “Your Highness, that’s shameless!”

Set off by the flickering light of red candles, he curved the corner of his mouth into a wicked grin, “Actually, I can be more shameless…”

…

When they met for the first time, he was the young prince who lived in his day of brilliance, while she was the pampered princess of the adjacent state.

When they met again, he became the crippled underdog suffering from frustration, while she became the lackluster hostage stranded in an alien land.

In his mid-life, he was defeated in the fight and had his legs broken; his wife passed away and he didn’t have anything left except his father’s detestation… After constant blows took the edge off his spirit, all he wanted was nothing but serenity.

In her teen-age, her state perished and her home lost; she lapsed into an awkward situation after being abandoned and having her marriage annulled… As endless hardships isolated her from happiness, everything she wished for was no more than peace.

…

“Lu Zhishan, when I first met you, I didn’t think I’d marry you…too old,” after years passed by, one day, she lay on his laps mumbling, with a kind of hazy beauty on her boozy face, “and lame.”

“Mu Nanzhi, you have the wrong memory. At our first meeting, I’m neither old nor limp.”

“…When was that?”

“When people were celebrating your first birthday,” that man assumed all gentleness and joy crept on his eyes and brows, “On that day, you were ‘drawing lots’ in the rear hall. I also sneaked there to have a look. But, out of my expectation, you directly grabbed my true-love knot.”

…

How vivid the red love pea is embedded in the exquisitely carved dice,

Just as my feelings for you deep in my bones.

- Description from Novelupdates

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.