I Am the Nanny of the Villain - Chapter 155:

He wants indoor plumbing. They think he’s conquering the world.Arthur was a genius engineer on Earth, capable of optimizing global logistics and automating entire factories. But he lacked one thing: common sense. Now, reincarnated as Arthur von Pendelton, the six-year-old son of a powerful Duke in a medieval fantasy world, he faces his greatest challenge yet: Drafts.Armed with the T.E.C.H. Interface (Trans-Epochal Construction Heuristic), Arthur can analyze magic like code and build modern technology from scratch. His goals are simple: Double-glazed windows, hot showers, and a toaster that doesn't burn the bread.But there is a problem. The people of this world don't understand engineering.He builds a high-pressure boiler for a bath; his father thinks it’s a “Dragon-Breath Siege Weapon.”He creates a hydroponic garden; the local church declares him the God of Harvest.He ignores a Princess's flirting to analyze the thread count of her dress; she thinks he is playing “hard to get.”Follow Arthur as he accidentally industrializes a kingdom, terrifies his enemies with home appliances, and remains completely oblivious to the fact that he is becoming the most powerful man in history.All he wanted was a warm bath.

The most famous deed of this princess was her words to her younger brother Liu Ziye.

When he became emperor, she told him, “Although your highness and I are of different sexes, we are the children of the same father. Why can you sleep with so many different women, while I must be only with my husband? This is so unfair!”

And after the Emperor Liu Ziye heard his elder sister’s words, he ridiculously thought it made sense. So he immediately corrected his “wrong ways” and painstakingly selected thirty handsome youths for her to enjoy.

Chu Yu awoke in the princess’s body and realized that she had obtained a male harem of three thousand; should she take just one to drink, or keep all of them?

- Description from Novelupdates

Zhou Rui had just turned 20 when his life took an unexpected turn. He was hit by a truck one day. Just as he was convinced he was about to die, something strange happened. Instead of waking up in the afterlife, he opened his eyes as a baby. Later, he learn he had reborn as Lumien Ofnir, the youngest son of a baron.As Lumien grew up, he realized this world was nothing like Earth. Magic was real, and creatures like goblins, orcs, dragons, titans, and other mythical creatures were part of everyday life.Fortunately, in this dangerous world, Lumien received another blessing. It was a system.Follow Lumien's journey as he begins to explore this new world with the support of a Harem System. The mysterious cheat that allows him to copy and develop the magical powers of any woman he has slept with.[Author’s Note: The earlier chapters might feel slow and boring, but I promise it’ll all be worth it once the pace picks up.]

In the 21st century Earth gave Birth to greatest genius ever. A genius who Master myriad of arts. Medicine to Engineering. Mathematics to Micro Biology. Weapon Designing to Environmental control. Music to Painting. Dance to Martial arts. He mastered Everything.