I think there are way too many storylines and they should be trimmed down to work on the really important part (Marin corruption). Like for example the whole grandpa x marin mom feels forced and out of place, as well as the homeless guy scene.
I know some people are into that but it adds nothing to the story, and it's just a skip-through if you don't care/feel grossed out.
Personally I think the focus should be on Marin, and how she gets tempted by her classmate due to Gojo not making a move with her. Maybe add a path where she gets corrupted by the old business guy instead.
From the side of Gojo, he also should have more choices to be tempted to spend more time with the sisters, and that having some kind of impact on letting Marin with more alone time with Ken, leading to more depraved actions than if he came back right away to be with her.