What if Issei was original incarnation of Phoenix? And Issei had a monster inside him.Issei x tiamat

young man, by the name of Issei Hyoudou, lived a terrible life. His father leaves him with a mother who blames him for things he isn't responsible for. When she gets a new man, that man turns Issei into a monster. He doesn't know what to do until he is given a purpose by a mysterious figure and now the only thing holding him back is the monster chained to his heart #dxd #issei #fanfiction