Being born a pure blood Devil to two Clans of the 72 Pillars wasn't something Issei Hyoudou concerned himself with too much. Until his mother and grandfather named him their heirs, in front of Sirzechs Lucifer no less. IsseixHarem or it wouldn't feel right in the DxD segment.
EnniNova:
-А Снейп-то, говорят, не настоящий!
- А какой?
- Так черный же!
- Это в каком смысле, черный?
- Во всех!
- Правда? Это точно?
- Ну, так автор говорит. И вообще, истина как всегда, где-то рядом.