Natural Girl

Hmph...I wanted not to be a debbie-downer, armchair psychologist here but it looks like I'll fail at that. It definitely is inferred that Chizuru has a freaky sexually past but I think she had it after she knew these two. That switch must have been triggered afterwards, or elsewhere where there were unique circumstances. Reason why I say that is bc she would have had a reputation no matter what innocent appearance she choose as a facade. The problem with keeping that type of a secret wouldn't be with her; it would be with the individuals she was fooling around with. Dudes, esp young dudes, are blabber mouths. If she was known easy pussy, word would have gotten around and she'd have a crowd following her where ever she went. Even if she was fooling around with just a small group, she would have probably tried to hook up with them first, as you said, and even then, again, dudes are sloppy in concealing secrets like that. She most likely had some wild, or even forced, coming out experiences post acquaintanceship...and speaking of being forced, there's also the more unfortunate possibility where she might have been abused at home that caused her to eventually get psychologically bent into an attitude of thinking that's the way to be accepted by a male, but I think that's less likely.

Well, in terms of this being hentai, yeah I see what you’re saying. It’s more pleasant to picture the unbridled slut as a free-spirited, self-initiated individual.