You know, the NTR in this game actually makes a lot of sense, it's even arguably objectively the best development. The ENTIRE reason why all this fighting and suffering is happening is because of a succession war, and having the king have lots of babies with noble women of high status and genetics (of which the heroines are) would be the best way to prevent this.
I also have new respect for Ares for not giving in to his petty self-centered emotions and trying to start a rebellion or something stupid like that just because of butthurt NTR rage. The girls are also having CONSENSUAL sex with the king. The king isn't even trying to hurt Ares, as he will let Ares have the girls if Ares bangs them. He even gives Ares his sister's hand in marriage, which would give Ares a TON of power. Baroque is actually a pretty cool bro.
Also, it's not like the girls would side with Ares if he choose to rebel. Baroque has the Holy Crest, the one thing that will unify their country, the girls have obligations to their country and people, the fact that the Baroque also have a magnificent cock is just a bonus. Okay, some of the girls do betray you for magnificent cock so maybe it's a little more than just a nice bonus but hey, it's NTR.
TLTR: All things considered, Baroque is a pretty cool bro. Ares starting a civil war and handing over the country to Hippia over NTR rage would be an incredible selfish and stupid thing to do.