One Piece: God of Space - Chapter 537 You can get it in person

Leo used to be an affluent rich young master, who fell in love with a foreign beauty and after a night of passion, they got pregnant. The young man returned home to discuss the issue with his family only to be struck by a tragedy that changed his life completely.After eight months of laying in the bed like a vegetable, he woke up because the Almighty Father System selected him as a host. From then on, Leo's life changed once more, but this time, it was not the world that flipped him over, but he was the one who flipped the world upside down.Would you like to read about the story of a vegetable rising from the brink of death and becoming into a godly existence who slayed gods, and demons only so that he could bring a smile to his daughter's face? Come along then.

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 ͡°)

Aelock, proud of belonging to a prestigious noble family, falls in love at first sight in a chance encounter with Klopp, who belongs to a lower-ranking noble family. Aelock approaches him without paying any mind to the difference in wealth and status, even disregarding the taboo of alpha-alpha relationships. However, Klopp takes no notice of him and marries another omega.

One of the top expert killers, tired of endless assassinations and having survived a cruel and suppressed life, decided to escape the world’s strictest assassin organization.