MTL - Tempest of the Battlefield - ~ 670 lowering posture

Abigail’s only crime in life was being born as the mute daughter of the deceptive maid, who drugged her boss and got pregnant for him… or so she thought.All her life she had to serve her stepsister, Genevieve, attending to her every whim. While Genevieve used every opportunity she got to make Abigail’s life hell, even to the point of seducing Abigail’s boyfriend.On the night she resumes college, Abigail crosses path with Jamal Jonas, a heartbroken elusive billionaire, who leaves behind a stuffed animal that belonged to his first love. Abigail keeps the stuffed animal, which stirs her long lost memories.Five years later, Jamal shows up again, but this time as Genevieve's new live-in driver.Working for Genevieve quickly places him near the supposedly mute and intelligent Abigail who he doesn’t immediately recognize, and soon enough, Jamal finds himself pulled in by Abigail's charms.Jamal quickly realizes there is more to her than meets the eye, and there might be more connecting Abigail to his first love than Genevieve.

Her – a glutton without troubles or worries who crossed over and became a young fat chick with a deep vengefulness.

Him – a young master of the number one power; a two-faced man with elegance and charming, good looks; he is the chosen one of the former saint god and a man who will only bend his back for her alone.

This domineering crossover’s slogan is, ‘Don’t touch if it is this sister’s, put it there if it isn’t this sister’s!’

…watch how the Domineering Glutton and the Two-Faced Venerate Emperor create sparks as they meet and collide, stirring the whole Spirit Treasure Continent into turmoil, how they fall for each other and how they kill each other, how life and death severs love.

- Description from Novelupdates

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 ͡°)