Arifureta Shokugyou de Sekai Saikyou (WN) - Chapter 470

Ruel finds himself thrust into a brutal post-apocalyptic world, bound to a bizarre “Milf System.” This system demands morally questionable acts – NTR, seducing milfs, and claiming other men's wives – as the sole means of gaining strength and essential survival skills.The brutal reality of this new world awakens Ruel's hidden lust and dark desires. He swiftly abandons any semblance of morality, embracing the system's perverse demands with growing fervor.Driven by an insatiable hunger for power and pleasure, Ruel revels in the ravages he inflicts, using his newfound abilities to dominate and conquer.His journey transforms him into a ruthless force, where survival is intertwined with the satisfaction of his darkest urges, leaving a trail of broken relationships and conquered women in his wake.

The poor aristocrat Viola suddenly received an unexpected marriage proposal from the prestigious noble household of Duke Physalis. An average noble daughter and the handsome duke. She had been confused, thinking that nothing made sense, but the duke had his own personal reasons. A political marriage with ulterior motives, both having their own circumstances. Will this path lead to happiness or sorrow?

Crossing into the world of Naruto, and acquiring the One Piece system, with all the powers of the world of One Piece, swordsmanship, devil fruit, domineering.

-Do you think that your fire is very powerful? I have the burning fruit.

-Do you think that your thunder is very powerful? I have a thundering fruit.

-Do you think that your otter is very powerful? I have the frozen fruit.

-Did you said you want to die? Don’t worry, I also have a nickname: Death Doctor.

- Description from Novelupdates

Zheng Nianru went from being a Commandery Princess who could be killed at any moment to the position of the Empress Dowager, wielding power over the world. What she couldn't accept was that she didn't end up with a good fate. However, Zheng Nianru thought that no one would have been able to save Nanzheng State.Yet, she was reborn and, having deeply reflected upon her pain, also considered several past mistakes. Firstly, she should not have married down into the family of Ju Nanyi, a man with a narrow mind who came from a minor house, who only thought about romantic affairs and entangled with her in desperate affection, incapable of assisting Nanzheng. Secondly, she should not have killed everyone in Qiandao Temple, which was the spiritual pillar of the people of Nanzheng State. After all, there were better ways, weren't there, like seduction? Thirdly, she should not have been so confident that the monarch of the neighboring country would fall at her feet, nor should she have trusted the promise of that fickle neighboring monarch, which led to years of drawn-out conflict between the two states.Um, Zheng Nianru felt she was not wrong. She just wanted to live well and to be a good Empress Dowager. Since she had the chance to live again, why did she have this chance? Could it be that she was expected to once again turn Nanzheng State upside down?