As I said i've done a lot of research on the topic as i'm also interested in those kind of stories. That power imbalance you are talking about is not always the case, the relationship depicted in the game it's also semi-based on a real story.What I liked about the original Our Fate was that it was possible to be a good father. For me, my internal debate was about letting her go (as every good father must do, eventually) or pursuing her myself. I never felt attracted to the corruption path.
In real-life incest, there is clearly a power imbalance on nearly every level: experience (both with life and with sex), money, physical and emotional power, etc. That is what makes corruption relatively easy and that is also why it is so damaging in real life. Most games have either a conscious corruption strategy towards the daughter (which I dislike) or a careless must-fuck-them-all harem strategy which is kind of fun to play but feels utterly unrealistic.
Corruption it's a thing that could affect most characters in the game equally it is not based on the usual power dynamics you see in other games as the mc wouldn't be the one pushing for it. Also it's just a part of the game that you can choose where you want to draw the line for.
The main focus of the game it's indeed a journey of love, taboo and gray areas.
Btw, if I remember correctly you can't avoid the sexual relationship with C in OurFate.