UPDATE!
From the beginning, I never intended to make "The Villain is my No.1 Fan!?" a "mature" rated book, despite it being in the genre of "new adult" geared at an adult audience. However, with later chapters in consideration and the themes of my other books, I decided to mark it mature.
When I post a refined/perfected version of the final book, I might consider adding some low-key sex scenes if readers want it. But for now, nothing will change about the story's trajectory.
Also, to make my stance more clear, all my books are intended for an adult audience.