How Should I Teach My Great Demon King Disciple?

Before reincarnating, Xu Youqian Youcai Leiye decides to transmigrate into that R-rated, dark and twisted novel to fulfill the last wish of some unscrupulous author. Isn't it just a matter of toning down the content and getting the work unblocked across the whole internet? Easy. But after transmigrating, Xu Leiye discovers that he's become the male lead Yan Shuiyuan's first cannon-fodder master! The kind who doesn't even survive the first chapter! And he dies horribly! So here's the question: How can he teach the future darkened demon lord male lead to become a pure, innocent little white flower and save his own skin? Xie Cangsheng: “Be a decent person. Respect your elders and treat others kindly.” Yan Shuiyuan: “I understand.” Xie Cangsheng: “Monogamy is the best.” Yan Shuiyuan: “Master is right.” Xie Cangsheng: “You mustn't turn evil and cultivate demonic arts!” Yan Shuiyuan: “Mm-hmm, all right.” Much later... Yan Shuiyuan: “Master, you can sit in the dark room.” Xie Cangsheng: “?” Yan Shuiyuan: “Master, don't make me tie you up with a rope.” Xie Cangsheng: “??” Yan Shuiyuan: “Master, even if you run to the ends of the earth, you can't escape me.” Xie Cangsheng: “???” Master-disciple CP Flirtatious, dashing, money-loving beauty shou X mentally unstable, conflicted, darkening gong Shou-centric In one sentence: Stop turning evil. I'll steal spirit pills to take care of you. A side note The author often has mental breakdowns, so feel free to set me straight. The author often loses touch with reality, so feel free to snap me out of it (...) The author often vanishes for mysterious reasons, so feel free to... Actually, never mind. Coo-coo-coo-coo-coo-coo I hope you'll leave me some comments. Praise, corrections, or criticism are all welcome. I want us to improve together. Content warnings (pay attention!) 1. Younger man seduces older man 2. The worldbuilding and System include my own additions 3. This author isn't very serious 4. The author is the king of vanishing 5. The foreshadowing isn't too complicated. I want both romance and plot. 6. I tried giving the supporting characters some extra scenes 7. No love rivals 8. Not a serious historical fantasy. The male lead will occasionally crack jokes. 9. Some scenes are homages. If anything seems too similar, please let me know and I'll change it. 10. Everyone enjoying the story is my biggest motivation to update~