I think AWAM had a strong and clear tendency towards incest from the very beginning. Some might not have noticed that, because L&P started the story extremely slowly, but it was clear from the beginning that this would be a big focus. This already starts with the car scene from the introduction, in which Ellie clearly accuses Dylan of what will later become his main occupation. I don't see any problem there, after all, the title "A wife and mother" for a porn game alone is a clear and unambiguous indication for the content people can expect. Ultimately, I'll maintain that there can't be too much Dylan, Ellie, and Liam content, since they belong to core family. This is what the game should be about and what i consider the original.
I also find the respective plot supporting characters important, such as Julia (as Ellie sidekick), Sam (as Dylan's rival), Amber (with Dylan as mirror to Sophia/Sam), Carl (as Liam rival) and Patricia (as ontrast to sophia extreme shyness of the beginning). All these characters are closely intertwined in the story and not only Sophia has to do with them. There are also some good reasons to have more characters in the plot (e.g. Natalie) if only they were more involved (not only with Sophia) and give more depth to the story. Aiden is one example for this, if he would not be so unbelievable as a villain and maybe has some more lines with charaters like Dylan etc. This also adds depth to the game. What I find totally nonsensical are story elements like the thugs or the old guys, who otherwise have zero connection to the story. L&P could easily remove half of the characters and the game would be better than before. Also, L&P should ask themselves how many classes the game really needs. Aiden's art class was just superfluous, considering Sophia has already class to teach, Dylan is active in a soccer team and Ellie has her dance group. Those are more than enough groups.