Toaru Majutsu no Index: New Testament - Volume 17, Prologue: Or the Assumptions Include the Conclusion - to_the_Girl’s_ABYSS.

After a series of life-changing events, Pei Ge decides to start anew and rediscover her place in this world. She gets a new job, new friends and… a new boss whom she mistakes as a male host!

He helps her to get revenge on a back-stabbing friend, supports her when it seems that the world has given up on her, encourages her to be more confident about herself and even… messes up her blind dates!

With her strong working abilities and fiery attitude, she manages to climb up the ranks in the company (under the devious scheme of a certain CEO) and even gains a fan girl who can’t wait to be her sister-in-law.

As Pei Ge navigates through the ups and downs of office politics, family drama, finding her right partner and societal expectations, she realizes that things are not as simple as it seemed and everything she had believed in is tested…

The Big Misunderstanding:

“You asshole! Why didn’t you use protection?! I’m pregnant!”
“…It’s not mine.”
“Asshole! You actually dare to not admit it?! I gave all my firsts to you! You jerk!”
…
At the gynecologist, she read her pregnancy lab report and was stunned: Irregular period.
The man raised an eyebrow and smirked, “Didn’t you make a ruckus about being pregnant with my child? Where is the child?!”
“…” Who is scared of who? Let’s make a bet!

Qinghe County master Gu Sheng died. She had a first class beauty, her name could move the world, but she still lost to the hands of a woman inferior to her. Gu Sheng was only able to understand that she was the antagonist of the heroine after her death, a cannon fodder.

In a pure white space, Gu Sheng was expressionless because of the transmigration.

System: “The heroine must change her fate, must fight against cannon fodder and the passerby to brush a sense of existence. As the master, you are their biggest stone in the way.”

Gu Sheng’s eyes flashed and made a peerless smile, “Then let me see who is the stumbling block that should be trampled and who is the final winner!”

- Description from Novelupdates

Content Warning: R-18, Smut, Cruel MC[Ding! You've acquired the Heroine Stealing System!][Your first task is to steal the daughter of the Eastern Kingdom's king!][Your Fate Value has increased by 10!][You've slept with the hero's mother, your Fate Value has increased by 15!][The hero has developed animosity towards you. Current Hatred Level: 5 stars][The king's wife is charmed by your looks.]After being transported from his own world, the protagonist wakes up as Vritra, the son of Demon King Rohan from the Hell Continent.Since he's from another world, he doesn't have any Fate Value in this new world of swords and magic.To survive, he has to act like a villain, stealing the affection of every hero's heroine and sleeping with them.This will boost his Fate Value and help him stay alive in a world filled with wars and political conflicts!

A modern university graduate, traversing the window between two worlds, steals a celestial cultivation opportunity that originally did not belong to him. And this celestial technique, quite unorthodox...My credibility should be assured. In order to be responsible to the readers, I must earnestly remind you: my book is easy to linger on in your thoughts, so proceed with caution.