Reincarnated in the Villainous Lust System! - Chapter 6: Ava’s Seduction part 1 (18+)

After breaking up with his girlfriend, he accidentally acquired a genius system and rose from there against the heavens, becoming invincible..

- Description from Novelupdates

[Complete 1V1 Pure Romance] Zhong Xiaoxiao had transmigrated. When she opened her eyes, she found herself on her wedding night, “You might as well prepare to be a widow.”Before she could understand what was happening, her cheap husband had fled, and she became the vilified and reluctantly married country bride. Life is like a dream, but one must carry on. So what if her reputation was in tatters? Rolling up her sleeves, she set to work with her whole family. When they met again, even if they couldn't get a divorce, acting as a fake married couple was still an option, right? However, as she continued to pretend, she actually fell... [New recommendation “Reborn Husband Tender Wife”]

She was born into a powerful family of the nobility, a blue-blooded aristocrat as capable as any man. He rose from humble origins up the military ranks, an iron-blooded knight with high ambitions. A transaction for power severed her from her childhood sweetheart. A tardy encounter was the beginning of his and her vow to meet life and death under heaven, standing shoulder to shoulder.

Political intrigue, dynastic succession struggles. He trampled through it all in the toil of becoming emperor.

Old enmities became new disputes, concerning life and death of entire families. She entered once more into the palace, changing the entire political climate of their world.

Meeting once again, they had become strangers. The peach blossom were all fallen, no more than a golden age grown cold.

- Description from Novelupdates

Eren Idril died as an old, decrepit, and piss-poor adventurer by the maws of a D-Rank monster. He had a lot of unfulfilled dreams and desires that couldn't see the light of the day after the light in his own eyes died down.

But fortunately for him and unfortunately for the world, that wasn't his end. Eren was somehow dived back in time when he was a mere teen, attending Lionheart Academy for adventurers.

When life gives him a second chance, Eren decides to exploit it to its fullest. Experience his vile deeds as he partakes in them without feeling the slightest bit of hesitation.