This has been one of my small gripes with the game in the previous update. I haven't played this update yet so I don't know if the trend continues. I had written something lengthy regarding this.
My issue with it came from the violence that was inflicted upon Erin. Not just physical violence, but the circumstances in which he was put in as well. I felt it became more abuse than sexual satisfaction, and that wasn't really my thing.
In previous chapters or scenes, Erin always had control over himself and his surroundings. He willingly participated in any sexual acts, partly because he himself was also a flawed character. Impetuous, emotionally unstable and especially impatient, these characteristics are encountered in young adults a lot, but also in any emotionally immature individuals that you find in professional settings. These characteristics, to me, were a major part of the game, as you are exploiting this as Mars in order to win the game, but you also play a superficial game of manipulation in your head to deprave and debauch characters. I'm not sure how to explain it but its top notch stuff that is very well written.
However, the latter parts of the story have veered too much into scenarios where characters either no longer make a choice to willingly participate, or have too much abuse or violence inflicted upon them without being able to object or resist. The culmination of the pigobi scenes also turned into this type of violence, and those story beats were skipped by me as well. The kicking and choking scenes or Erin, as well as Cecille's physical abuse of him were also off-putting to me, even if the art was very well made.
Again, I had written about this before, so I don't want to reheat an old conversation but I get what you mean.
But now, especially with the latest update, the art has progressed and evolved so much that even those scenes are worth watching. I do wonder if Nitrolith will ever go back and update some of the older cg's.
The CG's in this last update also made me think on how Mars has truly become more demon than human. None of these characters, especially the village folk, would become this depraved and debauched without him. I think at this point, he exudes corruption and perversity without even trying, which is normal as he has taken so much power from both Hellele and Erin.
I don't think Mars deserves a good or neutral ending honestly, even if he himself is trying to rebel against the status quo. Granted, the status quo in this setting was also being corrupted by the major Goddess, but Mars has twisted and caused too much emotional damage in my opinion. He is just so good at deflecting it to other party members and make them fight and hate each other. Very fun to play and experience, but I would really like to also see him get his comeuppance.
EDIT: Played through the update, and got some new lore, changed my mind.
There is a game called 'Shadows of Forbidden Gods' that also explores this theme, minus the +18, where your objective is to corrupt notable characters, nobility and heroes in a fantasy world and usher in an era of darkness and shadows. Something like that, along with a 4x genre, where you can train soldiers, build buildings and corrupt cities/towns would be so good and fun to play. I know that Seeds of Chaos is similar to what I have described, but I don't really enjoy how powerless the MC is written and the situations he is put in, and that game has too many kinks that do not appeal to me.