Transmigrated into a Book as the Little Apprentice of a Villainous Demoness

Yue Mingjiao was annoyed to transmigrate into a xianxia romance novel. She was even more annoyed to become the little disciple of the villainous demoness in the story. The demoness hadn't turned evil yet, and doted on her little disciple beyond measure. If she wanted the stars, she'd get the stars; if she wanted the moon, she'd get the moon. "Since you're in love with that eldest disciple of Tianqian Sect, I'll kidnap him and make him your cultivation furnace." The demoness master said this, then returned the next day with the male lead, Helian Aotian, bundled up and ready to go. Yue Mingjiao was close to tears. Master, do you know who you've kidnapped? Please don't look so proud of yourself! Other than being too blunt, her master was practically flawless. Yue Mingjiao tried her best to keep her from turning evil. She infiltrated the righteous sects, turned the protagonist against them, and prevented their sect from being destroyed. But, but... Why did her master still turn evil? Why did her master expel her from the sect and take on a new disciple? Why, when she finally worked up the courage to confess, did her master stab her? Sigh. Love is nothing but a load of crap. She'd never fall for anyone again. Demon cultivator Shui Lingxi was reborn on the day before her little disciple Yue Mingjiao graduated. In her previous life, it was this very disciple, the one she cherished most, who consorted with the eldest disciple of Tianqian Sect and allied with the righteous sects to destroy the demon sect, driving her into madness with rage. In this new life, she would never be fooled by this treacherous disciple's false face. [Content warning] An idea that may or may not get written someday. I'll leave it here for now. Master-disciple pairing. A gentle, steady little disciple transmigrates into a book; her demoness master, who turns evil, is reborn. The plot is melodramatic. Theme: To lose the light after finding it is more painful than never having seen it at all