Dev: I think you've started making a common mistake in the latter parts of this VN which is leading to its decline. It may not be too late to save it and turn things around. What attracted players to this game was largely that Anna had a fiancé whom she loved and was trying to be loyal to, but invariably kept finding herself in compromising situations, or having to submit to them. This was what generated most of the eroticism.
But of late, that has changed; she has become a slut. Where once she tried to stay loyal to Andrew (whom she really does love), she now seeks sex with anyone and will spread her legs for anyone. A slut is only interesting for a brief initial time--after that there is nothing attractive about them and the erotic content you once had is now lost. Now it's just a slut screwing any man or woman. Not only is that unappealing, it is hugely snoozville. Turn Anna around, make her chaste once more, trying to recover from her unfortunate fall. Return her to trying to be loyal to Andrew (but still failing.) Have her return to trying to turn all these guys in town down that want to bang her more, and have her fail for one reason or another still. It doesn't always have to be blackmail--it can be by trickery or even persistent smooth talking or seduction. Yes, it requires more creativity from you, and more work, but it is worth it; it's what creates what attracts and keeps players.