>>8534853I just took a look at the roster for some recent games, and I don't think it's likely because of a "it's fine with what they're already doing now" setup.
There are a few instances of what might *qualify* as incest, such as Sayuki in Kutsujoku 2 relative to the protagonist (shame we never got to actually see her in a threesome), and of course Kazoku, with its step-sibling and stepmother situation where the protagonist outright tells Nagisa in their first scene "Cut the sibling crap, we were strangers less than a year ago!"
It seems to me that BISHOP has decided that full-on incest is a little too much straying from their schtick, or possibly too niche a market, but they're not blind to the potential appeal it might bring for certain players.
So if they it, they sorta sprinkle it in to spice up the female for those who are fans of the taboo in incest, but distant enough that for anyone who isn't just zealously anti-incest to the point where even the hint of blood relation turns them off entirely (which is bound to be an extreme minority), it's just a minor background detail and doesn't change much.
That might even be one reason why Kazoku sold less well - it's extremely overt in the premise that this game is an incest-lite setup, but that turned out to be laying it on too thick compared to how BISHOP does it otherwise.
What I mean to say is, it's possible, but given Kazoku was in the pipeline it's not likely beyond the little dash of flavoring that BISHOP has done more commonly.
I think what'd be interesting for me is if, in a series like Tokubetsu Jugyou where there's a new protagonist every time, the daughter conceived from a previous game’s rape is a heroine, and either is the “insider” character to get the protagonist started, or her training is more subtle where she liberally masturbates and believes rape to be good and is easy pickings for the protagonist. It ain’t incest, but something I thought for minor series continuity.