Because I am not famous enough to be trusted enough to tell you a story without any spoilers, I am legally required to tell you that this is an adult book with adult themes that includes very explicit descriptions of sexual acts. Furthermore, all of the completely fictional characters in this story is at least 18 years old and none of them engage in sexual relations with family members related by blood.
Furthermore, absolutely no one was harmed in the writing of this completely fictional story that, again, exists only in your imagination and does not involve real people.