My Evil Stepson System - Chapter 27 . Wrong Decision?

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

A tree of 10,000 flowers, the world is the door.
The spells change a lot, but the hearts of the people are unchanged.

- Description from Uukanshu translation

After being reborn, Bella Green is determined to punish the scum, slap faces, and sing her way to the pinnacle of life. However, she is accidentally picked up by the person she least wants to see and taken home as a cheap 'brother.'Faced with the naughty yet particularly disobedient little Demon King, Mason Bennett sternly instructs: “No fighting, no skipping class, no dating!”One day, the little Demon King shows up on television in a stunning long dress, and Mason Bennett is furious, immediately tying her up and bringing her home for an in-depth lesson!!Looking at her suitors who were beaten up and unable to take care of themselves, Bella's eye twitches, what about the promise of no fighting?Being forcibly dragged out of the classroom and carried home by a certain jealous king while attending class, what about the promise of no skipping classes?Finally coaxed and deceived into the civil affairs bureau, Bella teared up, damn it, what about the promise of no dating!!!

Warning contains-Incest/Ntr/ Heavy NetorareA Boy struggles with the problems of being raised in a family full of lewd older women.