MTL - Pirates: Becoming Stronger and Bigger Since Becoming Shichibukai - Chapter 31

He Lang died by his own hands for the sake of his imperial younger brother’s ambition, whom he loved. He was offered to be reborn in exchange for giving up his past romantic feelings. Reborn without the burden of his romantic feelings, he brings with him a manual to new worlds. He wholeheartedly followed the instructions of the manual to complete the tasks, not knowing that the originally slag gong was blackening…
He pleaded to his affectionate Emperor brother to release him, he pleaded to the paranoid prisoner next door, but until the end he remained baffled.
In the end, he discovered that the full name of the manual was – “Slag Shou Cultivating Manual”
Σ (っ ° ° °;) っ!

- Description from Novelupdates

The world had changed when the System arrived, alongside the Cataclysm that filled the world with monsters. The technology was gone, replaced by classes and skills that allowed the people to fight back. When Devon ended up as a Blacksmith, a class that didn’t grant Intelligence, he had to face the reality, that his old career that he loved - mathematical sociologist - was over. Instead, he had ended up as yet another discarded member of the production class, overshadowed by the existence of the System Shops to the point of total marginalization. But, what if all he needed was to reapply his scientific thinking to the System...

Ye Qianning has become a six-year-old Xiaotuanzi. Not only does she have dual-line abilities, but she also has four fathers.

“father!”

Tuanzi cried and chirped, and the four big bosses in the prime of life of the imperial capital were all in a mess in the wind.

Wenchen’s father: “Little girl, father can’t be mistaken, hurry up and go back where you came from.”

Father Fox: “If I have a daughter, she must be the most beautiful woman in the world. How can I be as fat as a ball!”

Huang Shang’s father: “Three generations of my Gu family can’t have a daughter, how could she be the seed of my Gu family.”

The general’s father was very excited: “Hahaha, I was destined to have no children, and God suddenly gave me a meat bun. Let’s go, my daughter and father go home!”

A little girl suddenly appeared in the General’s Mansion, which provoked several influential people in the capital to lie on the corner every day, and finally stopped leaving. Qi Qi said, when will my daughter go home with them, and when will they leave.

The general’s father was angry: “Why didn’t you recognize it back then, now whoever dares to snatch my daughter from me, I will fight with him.”

The serious young lady next to her whispered with her little hands behind her back: “She will marry me as a daughter-in-law when she grows up.”

Hearing that the eyes of the four big bosses were on fire, it was extremely dangerous.

Tuanzi looked at the drama that was performed every day, and helplessly supported her forehead: “She just wants to raise a big space so that she can live a long life… Don’t lose the vest.”

“Group Pet” “One to One, Childhood Sweetheart”

- Description from novelbuddy

Dual cultivation isn't a choice; it's a necessity.

After being struck by a truck like most lucky protagonists (or unlucky ones), Vaan found himself transmigrated into the body of an orphan in the world of witches and demons.

However, they didn't always exist.

Demons terrorized the world ever since the Gehenna Realm descended over 300 years ago. but along with them, came mana, giving birth to witches to combat these demons.

Since then, the world of men was dominated by witches, establishing the seven witch kingdoms, which safeguards at the forefront of the demon invasion.

In order to survive in the matriarchal society of the witch kingdoms, Vaan, like all other men who cannot use magic, had to learn how to service the witches to survive.

Nevertheless, it did not come without its own benefits.

Years of research have led the world to the discovery of intimacy between men and women could increase the witches' mana absorption.

But at the same time, men could absorb some of this mana to improve their physique and lifespan.

Thus, since then, an intricate relationship was formed between men and witches in the red-light districts. Love became casual, and dual cultivation is common.

As a prodigy in the art of pleasing women, Vaan lived a smooth two years since his transmigration as an orphan.

However, everything came crashing down in a heartbeat one day when his life was nearly taken, and Lady Eniwse whom he served went berserk.

Even so, that was not the end.

With the awakening of the Witch Hunter System, watch how Vaan takes on the world and becomes the lord of witches.

=====
Note: Contains lemons.
Hunting witches does not necessarily imply killing witches if you know what I mean ( ͡° ͜ʖ ͡°)