Stop getting caught up with the name. It'd be Family fucker if she had her druthers currently, but her family isn't fucking her. Just her brother. "Family fucker if only dad would quit being so shy" is way too long of a name. Get over it. She's had an interest in incest for quite a few AT's now, why would you think that wouldn't bleed over?
.... I would think it would bleed over in a natural progressive way just like everything else has been progressive, not forced in your face as a forced scene you need to go through in order to progress the MC/sister relationship.... you should be able to go to girlfriend state without her being a daddy's little slut lmao. Which btw you so conveniently ignored that she is being a slut flirting with another man while already in a sexual relationship despite it supposedly being banned XD
I just poor design. And you are just making silly excuses.
There are many different names you could easily come up with that would serve that purpose, but the fundamental issue isn't just the name, let me re-use this form the comment before.
This is the current structure and flow of the relationship:
Becomes interested in brother > becomes obsessed with brother > basically rapes brother
> suddenly wants to fuck her father > Loyal girlfriend.
"suddenly wants to fuck her father" this step shouldn't be on the route to her becoming MCs girlfriend lmao. that isn't how shit works XD you are forcing content into a route that doesn't fit said route.
If it ain't about just the brother, don't call it "brother fucker". There is a term for when this happens, and it is called false advertisement XD
I tried to be as civil as possible, but you seem to want to not give two shits about any opinion but your own, and ignore the obvious faults in what you have currently put out.
Great design though, aids amount of grind only to be mislead by what you are lead to believe is there XD Totally not gonna piss people off if you keep that design mentality.
But here let me reiterate for you once more, If you call something the apple stage, then it better be about apples, and not have an orange pop-up XD
Design consistency is a thing, would be wise to adhere to it, if you say a character isn't a slut... don't have a scene where they are being an obvious slut.