The Demon King's Thousand-Layered Schemes

[Blurb] Lita, a demon king's tutor who was born at the same time as the Demon King's Tower, has taught and helped countless generations of demon kings successfully kidnap princesses. But when the latest demon king grew up, every time he went to kidnap a princess, he came back empty-handed. To help him, Lita infiltrated the royal castle and became the princess's maid. But one dark and stormy night, the demon king mistook her for the princess and carried her back to the tower. The tutor, much smaller than the princess, was furious. "Can't you even tell me apart from the princess?" Your father, grandfather, and great-grandfather all managed to kidnap princesses. Why are you the only one who can't?! The still-growing young demon king blinked his beautiful ruby-red eyes and pouted. "The roses in the princess's garden were so gorgeous. I wanted to pick one and put it by your bed, but some rose juice splashed into my eyes, and I still can't see clearly. I'm sorry..." Seeing the demon king, a boy so delicate and pretty he was almost too beautiful, like this, the soft-hearted tutor could only lean over and blow on his eyes. "All right, but don't let it happen again." The demon king instantly brightened. "I already stole some rose seeds from the royal garden. I want to plant a whole field of fresh roses by your window! Can I wait until I've planted them before I go kidnap the princess?" Lita: "...All right, but don't let it happen again." Lita didn't know that the next morning, every rose in the royal garden had withered. The seeds were missing, and even the finest gardeners in the kingdom couldn't grow them again. Outside Lita's window, the demon king crushed all the extra seeds. Roses meant for the girl he loved, of course, could belong to her alone. Even though she still innocently thought of herself as nothing more than his elder and tutor. Theme: Love can save everything.