You said didn't want to play a game with disgusting morals. I am reaffirming that belief. I'm informing you (and other people who may come across your comment) that the optional hidden romance with your cousin, is in fact one of the more moral aspect (as it is morally questionable, but politically astute) of the story. If that makes you uncomfortable, then everything else in the content warning will probably make things worse. Because they are in fact, much worse.
This is game, at it's core, is a political drama about solving a succession dispute between cousins. Those familiar with the political fantasy drama genre (or GOT/ASOIAF in general) will know what sometimes happens when there is a need/want to consolidate the line succession in noble families with cousins.
This game is dark and Eirk's Route are for the sick bitches like me who don't mind exploring the more taboo/unconventional aspects of game scenario. And for those who don't want to engage with it, there are the other conventional/wholesome romantic interests for them to pursue. (Thea and Finn are a good place to start!)
It's not for you and that's okay. The IFs genre is very large and there are probably other games that can scratch the same itch for you.
Bye~