I think one of the cool things about this game is how Inoda is managing to win Asuna without having to force her into sexual acts using some kind of threat (which tends to happen a lot in some way when we have ugly bastards antagonists in NTR games). Inoda is managing to use her feelings and take advantage of her empathetic nature so that Asuna herself chooses to perform sexual acts with him and eventually fall for him and his big dick, and the way the dev is writing it makes it seem believable. So I hope we don't see blackmail with Asuna here, and continue on this approach that Inoda is doing.
And also as I said here once before, it would feels really weird for me to change things to a blackmail/threatening path when we are already halfway through the development of the cheating/seduction path.
That said, I might accept a possible blackmail against the mother here, depending on how and why it's done. And as long as the blackmail narrative don't reach Asuna's corruption, as I said before.