Sold as the Alpha King's Breeder - Chapter 1302 - 57 : Battle Against Silver Fang

As the Evil Deity of the Earth, the Ruler of the Wasteland, and the Mother of Desolation, Bai Lianyue now finds herself utterly bewildered, pinned down on a bed. Over a decade ago, in a moment of carelessness, she inadvertently ended the life of the Daughter of the Gods. Wracked with guilt, Bai Lianyue took it upon herself to raise the three children the divine daughter had left behind. Her original plan was simple: wait for the children to grow up and…

This story is set during the end of the Sui Dynasty, a time where multiple powers struggled for supremacy and power.

A teen is summoned to another world as the Hero. It turns out the Hero can power up women with his cum.

In novels with a stud there is always a Senior Martial Brother like this:

In the early stages of the novel, his innate talent is high, his cultivation is good, his appearance is handsome, and he has an intelligent, cute younger Martial Sister as a fiancée.

In the middle stages of the novel, he is caught unprepared and defeated by a young disciple (the protagonist) in the sect who’s hardly remarkable at all. From then on, he falls from his godly altar and loses his brilliance. Even his young Martial Sister leaves him for someone else.

In the late stages of the novel, he continues to turn dark, going down the Demonic Path and becoming the major villainous boss. However, the protagonist still ruthlessly defeats him and his soul is eternally sealed.

Once Qin Mo opened his eyes, he discovered that he had become this Senior Martial Brother.

- Description from Novelupdates