Something I just realized -- this game already has incest just that it was revealed slowly through the updates rather than just outright spoken.
Correct me if I'm wrong, but we know that Duncan Helmer is MC's son. But we do know that he used to be a thing with Carol, thus Hannah could be Duncan's daughter. The same thing for Heather and Chloe, so Chloe could be Duncan's daughter as well. Thus making it incest when MC is banging both his sister (Hannah and Chloe) and moms (Heather and Carol). Make sense?