Monster Heir, Online Contract!

A self-proclaimed loyal dog but actually wicked servant of a heavenly demon, top x a good young master who offers himself to demons, bottom / Gou Qi, twenty years old. One day, Gou Qi woke up to find he'd sleepwalked into a luxurious king-sized bed. In front of the bed, two rows of bodyguards in suits and sunglasses shouted in unison: "Long live the young master! May you enjoy blessings as boundless as the Eastern Sea and live as long as the Southern Mountains!" "May your reign last for millennia, and may you unite the demons and monsters!" Four huge characters hung above the main hall: "Church of the God of Light"... Gou Qi: ... This is bad. His bright future was all too easy to see. . The next day, Gou Qi learned from his butler that he could use contracts to force demons and monsters into submission. Gou Qi: Is he some shady little Kyubey, making contracts with magical girls? Butler: A friendly reminder: the sooner you make a contract, the stronger your demonic power, and the longer you stay alive. Gou Qi: Did I just hear the word "alive"...? Butler: You're the worst of the worst. If you offer yourself to a heavenly demon, naturally you'll die quickly. Gou Qi: Come on, there aren't any heavenly demons in our loving family villa, are there? Butler: I'm afraid there is. It's me. . A little skit: "There are many cultivators hidden in the modern world. They silently fight demons and monsters in the dead of night, protecting our bustling, brightly lit cities." "And us? We're the greatest demons in this world." "Dad always said the best way to beat demons is with demons." Beneath the night sky, the boy secretly put on a ghost mask and went to discuss his ideals with demons. With the mask on, he's a demon. With it off, he's human. . One day, a heavenly demon who toyed with the world became bound to someone called "Master." This bond was fragile and unreliable, like a vicious dog putting a collar around its own neck. Everyone thought he would turn on his master, but he claimed to be the most loyal servant. "Young master, you only get one life. Make sure you treasure it." "Humans are fragile creatures..." "Once you lose your life, come to hell and stay with me for all eternity." [Make full use of me] [Offer yourself to me] . Young protagonist / spiritual qi revival / demon-slaying in a new era . Master and servant, servant on top The story may be revised when it begins Theme: If every demon offers just a little love, the world will become a better place