Life Simulation: I Caused the Female Sword Immortal to Regret Forever - Chapter 312:

What would happen, if one day fantasy collides with reality?

- Description from Novelupdates

There are 5 books on the 6 sworn brothers in a serial called streamer (流光系列). ‘They are rich, handsome and powerful. These book are on various types of love as well as on the bond and mateship between the brothers. Book on youngest 6th brother.

Chen Yu Bai (3rd brother) & An Xiao Yi – Chen Yu Bai is a sharp, domineering & cool man whereas An Xiao Yi is a foolish, childish & innocent girl. He is her boss & she is his secretary. He bullies her yet at the same time will not hestitate to protect & shelter her. Thus, she can always rely on him. Their relationship is a funny one on how opposite attracts.

Li Wei Ran (5th brother) & Qin Sang – Li Wei Ran and his cousin Qin Song fell in long with Sang Sang who is An Xiao Yi’s best friend. Sang Sang sees Li Wei Ran as a good man. He is polite, patient and passionate whereas she is independent, intelligent and interesting. They are a perfect pair but she is afraid to love so he has to work hard to convince her he is worthy of her love..

Short sequel on their children.

Born into darkness, Lucius is marked by an infernal curse—the Mark of the Abyss. This unholy sigil endows him with powers that defy mortal comprehension, yet seals his fate: servitude, rejection, and a grim demise.Embark on a journey with Lucius as he unravels the hidden truth behind the Marks, battles to carve out a destiny of his own, and strikes back against the cruel fate imposed upon him.In a world that shuns him for his cursed existence, Lucius will forge unlikely alliances to challenge those who scorn him. He is driven by a relentless desire to claim a place for himself and his loved ones, no matter the cost.Prepared to plunge into the darkest depths of depravity, Lucius is poised on the brink of a harrowing journey. The ultimate enigma remains: what awaits him in the abyss of his ambitions?

A Japanese salary man was reincarnated in a different world with swords and magic. He reincarnated into the family of a powerful noble. One day when he became twelve years old, he was suddenly summoned by his father.

「 I do not mind whether it is a woman in the town or a maid in our house, learn about women.」

Having gained the permission of his father, he uses his power as a noble to have his way with women.