or manipulate her into having sex with you.
Given that the whole premis of the game is for you to manipulate your way into D's pants I am not sure the D only path is any closer to your "decent guy" ideal.
The game is not about developing a Platonic, Paternal relationship, it is about getting your dick (and maybe others) into your daughter's pussy.
It is fun, well produced with a plausible story line, not the hardcore corruption game in the original outline, but still caters for the incest / corruption (manipulative, not forced) kink