Fics like What Tengen heard and what he shall not reveal (to anybody but his wives)

The demon pivots on his heel, disregarding the furious Pillars and their weapons. He turns towards Ubuyashiki-sama who has appeared in the door. “I will help you defeat the Demon King,” the demon announces, though that sentence is clearly unfinished. Giyuu stops breathing when the demon points right at him, “but that Slayer is mine.” The Slayer Corps is losing the war against Muzan. Kyoujurou is an old and powerful demon able to help them defeat the Demon King—but he won’t do it for free. Giyuu makes a deal fully expecting the story of his life to turn into a body horror, but willing to make that sacrifice. Kyoujurou hopes for it to turn into a romance instead. One of them is right. (Or: Tomioka Giyuu slowly re-learning how to smile thanks to a severely underslept demon.)

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