Hold on, in that chapter 10, Issei isn't pervert since birth you know? At this point he still doesn't even know anything about women until that old man in the park corrupt him and even after that he still doesn't understand what he is talking about.
Sol_Pendragon
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LIKEI'm more curious if Issei will become the victim of another bashing fanfics here, I mean author even went as far as making 6 year-old version of Issei here who still doesn't understand any sexual things even after being corrupted by both of his grandfather and old man in the park (atleast for the time being) become pervert bad enough to drive teacher to resignation and almost get himself transferred eventhough his sexual organs shouldn't be able function at that age yet, doesn't fill me with optimistic and fact that our hypocritically manipulative pedo Mc who aim for little girls hate Issei doesn't help too.