Hah! Called it that she was doing that. Kind of sad my other theory about her being a VA for adult animated videos wasn't true, but oh well!
For what her other secret is...I dunno what to think on that. Is it bad or basically inconsequential? With how all those noises turned out I cannot see it really being all that bad as so far this series hasn't really gone down the "dark" route, but anything is possible. For now, I would guess it has SOMETHING to do with Nao. Like she kissed that guy that Nao saw and she didn't want to go back because she was afraid he would hate her and not talk to her anymore...which would honestly track with her character and how she does NOT want to be hated by Nao.
Also, bets that her being more "perverted" than he could imagine has literally nothing to do with sexual stuff?