He Who Stands Above All (Highschool DXD X OP Male Reader)

Y/N was an average highschooler... or at least he looked like one. Deep below, he is a total mystery. He knows about the supernatural. He knows about Sona Shitori's real last name. Sirzechs, Rias's older brother, has a feeling that he knows who Y/N is... or rather... what he is.