After I Transmigrated into a Book, the Little Emperor Kept Wanting to Mark Me

Xie Rang transmigrated into a book and became its ambitious, powerful villainous Imperial Tutor. The original owner treated the young emperor, the story's male lead, as a puppet, tormenting and suppressing him in every way. In the end, the male lead grew powerful enough to have him cut to pieces. On the day Xie Rang transmigrated, the young emperor had laid a trap in his chambers, waiting for the original owner to take the bait. With nowhere to run, Xie Rang steeled himself to follow the plot, only for the young wolf cub to bite him right on the neck. The bad news: this was an ABO world, and the young emperor was experiencing his first rut after presenting as a Qian Jun. The good news: Xie Rang was a Zhong Yong, someone who could not be marked. The young emperor lost control during his rut and accidentally marked Xie Rang as a Kun Jun. Until he could find a true Kun Jun to complete the marking, Xie Rang had to stay by his side and soothe him, or his life would be in danger. Looking at the young emperor, whose face was full of disgust even as he clutched Xie Rang and refused to let go, Xie Rang thought: ...Fine. It's just a few more bites. I'll pretend a dog chewed on me. . To solve His Majesty's problem with losing control during his rut, the ministers grew so worried they went gray, searching the realm for Kun Juns. But the young emperor was incredibly picky. Their family background was too powerful: no. They were too thin: no. They were too slick and power-hungry: no. They weren't as good-looking as the Imperial Tutor: no. Xie Rang: . . Before long, the situation gradually stabilized, and Xie Rang seized the chance to resign and run away. Before leaving, he brought in a group of Kun Juns who fit the young emperor's tastes and asked him to pick one he liked. The young emperor, who had never made a sound no matter how badly he was bullied as a child, sat on the dragon throne with his eyes turning red. As for what happened later... They say His Majesty flew into a rage and dragged the Imperial Tutor into his chambers. Neither of them attended court for half a month. Deep in the palace, the young emperor's eyes were bloodshot as he repeatedly bit the back of Xie Rang's neck. "I don't want anyone else. I only want you." "If I can't mark you, I'll just have to do it a few more times." "You'll never escape me." An ancient-style ABO setting, with many original worldbuilding elements. The story's own rules take precedence. Set in a fictional dynasty. The leads have an age gap. No children. Theme: Supporting each other and never letting go.