The Demon Within: Volume 9 (The Demon Heart Series) by Margie Eileen Jones

“Sebastian Black Midnight, no matter how Angelic he seems is a demon through and through. When a misunderstanding causes Sebastian to go into a jealous rage, he attacks Calis Midnight, his tiny husband, who shares something truly intimate that Sebastian felt was his own. Due to the hurt and pain Sebastian feels he does something he regrets immensely and causes Calis to fear him which is the last thing Sebastian wanted to do. Sebastian begs his beloved little husband to forgive him since he does love him more than anything in his life. Calis finds out from Luke that Sebastian is in heaven in the bird cage prison and that Sebastian has been to hell. Calis fears his husband will be upset with him for being placed in prison which is far from the truth as Sebastian merely wishes for Calis to forgive him since he wishes to atone for his crimes. Azrael, the first Archangel of Death is the main authority in punishing the prisoners of the bird cage prison and finds out that Sebastian is really his son, the Archangel cherub Ethaniel, which was Sebastian’s true name. Azrael wishes to help his son and show him he is loved. Michael however feels that Sebastian needs to be punished fully for his transgressions. Later, Sean is hurt during cleanup operations in Jamaica with Azrael finding out the boy is his grandson and the first and only natural born half Archangel/half Angel. Since Archangel cherubs are not normally able to produce young, Sean being half Angel wants to try to fertilize an egg to create a cherub for Sven and himself. By some miracle of the fates, Sean can produce not only a cherub, but an Archangel cherub.” "This series is not meant as a stand alone series and is meant to be read in order."