Typically "housemate" is used to avoid incest flags in games like this.
Oh and such a loss it would be to not get such comments from such an asshole as you are, right? 😁
I never experienced your issue because my version is not censored and therefore has always stated from the start that Vica is my sister and never requested me to choose our relationship while you played an incest-censored version which I agree is a shame because from your reaction, you would have avoided this game from the start had you known it involves incest and then I would not be having fun humiliating your arrogance now, would I? 😼