I actually like the premise and the title. I think Daval's "mistake" was in starting the series off with David and Sarah. I think he would've received as much flack if it started with Sarah and Aaron as well. Had uncle Peter arrived before his brother got sick, I think Daval could've spared himself some headaches having to explain his motivations. Don't get me wrong, I understand the reason a lion's share of the fan base got upset. Even though he stated that he intended to introduce Sarah's father at some point, he did set it up as a three chapter aunt-nephew "romance," appealing clearly to an Oedipal element which is its own beast within the incest genre. And terror mentioned that Daval promised he wouldn't introduce NTR to the series even when asked, so I think Daval at least bears some responsibility in the messy incest hodgepodge Madness Together has become.
I've stated before that I'm alright with Madness Together's narratives as long as the female characters, notably Sarah, have sex with their relatives, maintaining the incest as you mentioned. And part of the reason I don't like Silvia apart from her portly unattractive design is that she's not family. I would assume that Sarah's father and sister will make an appearance at some point.
I would've hoped for this to be the case. But unfortunately, it would appear that Daval tries to create the same thing in each of his comics--i.e. depraved, polyamrous, debaucherous sex. If you examine closely the first pages of I.D., I'm fairly confident that Daval may have wanted to go a different direction with the story, where possibly Lana, Martha, Sofia, and Rosa act like frustrated, horny married cougars who go after young men to satiate their lust. After all, Daniel wasn't introduced until page 53. And even in chapter 4 (my least favorite) it was clear that Daval was trying to steer the narrative to Daniel becoming a cuck.
I'm with you. I wouldn't mind each of these works bearing their own thematic identity. That is have a strict or semi-strict Mother/Son incest comic with ID, have a incest free-for-all with MT, and with SN... I don't care, I don't read much of it to be honest with you. Presumably a harem?
I would've agreed with you on this point had Daval not made concessions in order to reel back the Uncle Peter fiasco. It's my opinion based on the events following Sarah and Peter's coitus that Daval emphasized Sarah's preferring David. Even in chapter 7, she gets jealous at the prospect of Silvia seducing David. Is a romance possible after Chapters 4-6? Not in my opinion. Again, it's messy. And I'm probably among the few, despite my "fanfic" for the prospects of Madness Together, who doesn't want Aaron to get involved with his mother, given that we've seen explicit images of her having sex with three other men, (Luke, David, and Peter) albeit relatives. The Oedipal theme won't land as effectively because Sarah has been "passed around." But it wouldn't be a deal breaker for me, either.
And I am by no means a fan of David. I don't dislike him. I just don't care for his role other than his being Sarah's nephew. And he looks like a lawn troll. If MT ends with Sarah's having had sex with David, Luke, Peter, Aaron, and her (unnamed) father, and Alice has sex with with David, Aaron and (maybe her uncle Luke?) then I'd have little to no complaints.