A Hentai System in the World of Danmachi - Chapter 224 - 223 - Takemikazuchi wants to talk to me.

As soon as Qin Feng opened his eyes, he was horrified to find himself lying in a drafty thatched hut. The problem was that he was still in his villa! What was even more horrifying was that there was another man lying under the blanket next to his legs!

“You, you, who are you?”

The man quietly sat up, exposing his upper body. He looked at him fixedly for a moment, then took a broken bowl from the table by the bed. He said in a muffled voice, “Wife, drink this water.”

Qin Feng rolled his eyes and fainted. Without permission, it is forbidden to reproduce or adapt it. Violators must be investigated.

Born to a mother on death row and subsequently raised in the prison, Gu Tianyou did not have what most people would consider a ‘normal’ childhood. Instead of the usual math and history one might learn at a public school, he had criminals for tutors. He received regular lessons from notorious serial killer, Dr. Miao, and earned protection from the respected Master Long.

With such a unique background, Gu Tianyou graduated from the Police Academy with little difficulty, and was assigned as an undercover cop. But will the skills he learned from a lifetime of being cared for by criminals be enough to help him take criminals down?

Every drop of this family bloodline is stained with sin. They are the embodiment of contradiction; calm yet maniacal, with great memories yet often forgetful. They pledge themselves to their dreams yet often compromise, are angels that are also devils… It’s why I hate them. And also love them.

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