Demon Lord: Erotic Adventure in Another World - Chapter 45: Towards The Dungeon

After avenging her brother, Xie Liangchen felt unburdened. Though she now owed a favor, she believed that with death, all debts would vanish like a snuffed candle.But as thunder roared, she found herself back at the tender age of fourteen. Beside her, Marquis Xuanwei had yet to develop the formidable and menacing presence he once had.Xie Liangchen was about to feign ignorance...Song Xian, with a slight lift of his eyes and a glimmer in his gaze, spoke in a deep voice: “Trying to shirk your debt?”“Didn't you say, 'Marquis, your great kindness will be repaid in another life, even if I must become an ox or a horse?'”Song Xian, who was on the verge of reaching the pinnacle of success, was abruptly pulled back to his nineteen-year-old self by Xie Liangchen's shocking revelation—Is this repayment of kindness or revenge?A powerful alliance with dual rebirths, overflowing pampering, and a thrilling tale of empowerment.

When I read the development of the heroine getting stolen away, I left a malicious comment to the author.

But then I woke up later, and I’m now the villain who is supposed to steal the heroine.

A mecha otaku is reincarnated into another world as Ernesti Echevalier (Eru). In this world there exist huge humanoid weapons known as Silhouette Knight. Dreaming of piloting those robots, Eru, with childhood friends, Archid Walter and Adeltrud Walter: together they will aim to become a Knight Runner, pilot of Silhoutte Knight.

Xu Mo, a modern high school student was sent back in time to Jing Kingdom and found herself trapped inside of the body of a princess with the same name.

She had barely recovered when she learned of an unparalleled fiancé and in a daze, they got married. Then the stunning genius physician who normally does not pay attention clamoured to marry her. After that, there was a cold general, a flirtatious lord, a tsundere young master……

As it turns out, this was a male-dominated dynasty. Because the female population was sparse, the entire nation shared wives regardless of rank or nobility. Is it feasible for someone who wants to maintain monogamy in this dynasty?

- Description from Novelupdates