I, the Hapless Male Lead, and My Heart Demon [Book Transmigration]

[The idea has changed, and I'm rewriting it for the third time. I've decided this will be my next book.] Chu Fan transmigrated into the most bizarre kind of inner demon. When he woke up inside his next body, he found his host torn apart, deliberately kept alive by a thread so they could torture him. Chu Fan immediately used a powerful rebirth technique, but when he learned the host's name, he was stunned. Yue Chenhuan, the hapless male lead of The Supreme of Ten Thousand Demons. Born with a rare innate constitution, he was tasked with slaying demons, only to be betrayed and corrupted into a demon himself. After enduring endless humiliation, he made a deal with a demon, was reborn, and embarked on a path of revenge, slaughtering his way across the land before returning as a king to claim the throne. Sounds thrilling, but he was the one the male lead would kill to prove his way. Chu Fan had meant to take over the body outright, but when he saw how young Yue Chenhuan was, he lost his nerve. Forget it. He could wait until the male lead grew up before making his move. He had to completely claim this body and find a way to transmigrate back. * Chu Fan found a way back. He faked his death perfectly, and before leaving, he couldn't resist teasing the male lead one last time. When he woke again, he found himself in a dark cave dwelling. His body was stiff and immobile. Beside the stone bed, Yue Chenhuan's gaze stayed fixed on him, following him like a shadow. "Are you getting used to the body I made for you?" "Chu Fan, you can't go back to that world. We'll be together forever." It's over. This time, he's really gone too far. Chaotic, fun-loving, mischievous bottom X beautiful, strong, tragic, scheming, obsessive top Reading guide: The usual one-on-one, both leads pure, happy ending. A story of healing. The bottom loves watching the drama unfold, while the dark, crawling, theatrical top is so obsessed with him that they go from fighting to kissing. PS: The worldbuilding is gloomy and sanity-draining, but both leads are in excellent mental health. Theme: A single thought can make a god or a demon