Satan's Son

Contrary to most people's belief, despite his despicable mission among humans, Satan is still a loving and responsible parent when it comes to raising his children, especially their education in the art of perverting human beings from their basic sense of morality. And to accomplish this evil goal, Satan had discovered long ago that the best procedure is to install his offsprings within the body of a human for a long period of time in order to understand everything that makes humans tick, so to speak.
This procedure doesn't always work as intended though, and to his chagrin, Satan discovers that his son Morael had been installed in the body of a mentally deficient human host from whom he can learn very little. To correct this error, Satan installs a new and much improved mind in Morael's host's body to complete his proper education.
The story follows the lives of the people affected by this rectification until Satan considers his son worthy and fully ready to perform the tasks bequeathed him by his birthright.