And those are semi-random, which makes every playthrough a bit different.Well that primarily comes from the opinions that are set and what you suggest to them over time by putting them into a trance. This also affects their happiness and obedience levels for positions and dialogue.
Of course you can rush things with incest opinion, but I find it more fun without.
I also like that there are many ways to play the game and challenge yourself.
For example, in my current playthrough I made the Marketing department my milking harem where I employed all the family members. If I get bored with this playthrough, I think next up will be the same thing but without using sluttiness serums (so only for trance to give opinions)