Unfortunately, even step-cest and adopt-cest are against Patreon's rules, so it's only a matter of time before dev gets the ban hammer. This story was also never meant to be true incest. The story about Abby's conception, her bio father, her half-siblings, etc. all work against it. The story would need a massive rewrite, and many many parts completely removed, just to make MC Abby's biodad. Same applies to Lilly and Becca, since their bio father plays such a major role in the story.
Marshall343 The incest tag is there because F95's rules say the tag must be applied whether it's true incest or step/adopt-cest. As per the tag rules post: Incest [Sex act between family relatives, including those not related by blood.]