[Crossover] How Is 5% Reputation Not Good Enough?

Recommended reading age: 22 and up. Warnings: I'm the author. The entire story is free. If you enjoy it, send me 50 yuan. This author is shameless. Read the blurb first Keywords: Non-human x non-human, Gui Deng x Yue Yan Fujiwara family young master Yue Yan: a calm version of Muzan, with a 5% boost to his moral character. [He has some moral character. How is 5% not something?] ◎ Side couple: Bai Ji x son-in-law (revealed once the story reaches that point) ◎ Schrödinger's cat: the Tsugikuni twins, Sun Breathing x Moon Breathing (might be written, might not) ◎ Shameless, immoral, and morally gray. This isn't a world of clear-cut good and evil, black and white. Talking about good and evil with non-humans is so too young, too simple~ ◎ Banned phrases: sunbathing / Wisteria-flower gua sha / So-and-so can blah blah Muzan, but that demon must die Pure romance for Ryoma. My take on a crossover. I'll update the character list after the crossover begins, and try not to spoil anything. Here's the 2020s standard-outline-style Jinjiang blurb During the Heian era, Fujiwara Yue Yan was frail and sickly from childhood. He was told he would not live to see his coming-of-age ceremony. Thanks to a miraculous medicine and his fierce will to survive, Yue Yan became an immortal. His obsession fused with a yokai to give birth to Muzan, half demon and half yokai. To clean up the mess that little bastard made and look after the descendants of his innocent older brother, Yue Yan jumped into Hell and worked there for five hundred years. He went through judgment and atonement at ten times the normal speed, then got a job as a demon guard. He evolved from a frail, elegant young noble into a beautiful, sadistic man-eating flower: vicious, ruthless, and shameless. He's an overtime-obsessed workaholic who exploits his employees, and his strength and sadism are enough to put him in Hell's top five. During the Sengoku era, Yue Yan climbed out of Hell to slay demons, only for that little bastard to blow himself into 1,800 pieces and escape anyway. Furious, Yue Yan returned to Avici Hell to work off his anger, only to be caught off guard when his sadistic boss, the god of curses and grudges, proposed to him. A hundred years after the two equally sadistic demons married, they had a problem child. Their unlucky son was born without empathy and had the personality of a problem child, so they named him Tong Mo. After their unlucky son found a job and made a career for himself, the two sadistic demons welcomed a second child: a daughter born with a mutation that made her a different species. She was born with albinism, so they named her Bai Ji. Their daughter dragged her brother off for reform through hard labor, kicked open a portal, and came home with a bunch of grandchildren looking to collect on debts. Theme: Fight poison with poison.