"A Guardian Angel" (Archangel Lucifer x Human Alastor) Radioapple au Story

An angel named Lucifer begged his father to go down and protect a human for over centuries, even Eons but instead his older siblings took that responsibility. That was until.... during the 1920s, after so long God actually let Lucifer go and even let him pick a human on his own free will. So once Lucifer went down, h...