[Demon Slayer/Reverse Harem Short Story] Dumping Doma to Become the Cult Leader

A short story written on a whim, featuring Douma as the love interest. The female lead is highly empathetic, proud, stubborn, and somewhat selfish. Be warned, she may not be likable. She has an illness that doctors say will kill her before she turns fifteen. Just when she finally thinks she might live past fifteen, her mother, who has joined a cult, drags her into it. The cult leader is incredibly good-looking, with rainbow-colored eyes straight out of a Mary Sue story. Too bad his handsome face comes with a mouth, and he has no feelings. But I'm not going to live past fifteen anyway. By a twist of fate, she becomes his wife. They're married, but don't sleep together. She enjoys the immense wealth that comes with being the wife of the Blissful Cult's leader. In the end... I'll go to hell to find you, liar. Theme: A love story