Personally I do like the build up. While I love incest games, I'm tired of everyone being a fucking whore for no fucking reason. The slow change on the view towards the protag is what gives you a goal in a game.
Sure it could have one or other like that, but all games now have it which ruins the genre. If I want that I'll just go see porn. I like to emerge on the story. It's like the corruption of the female protag genre, it got popular, which provoked an huge decrease of quality on the genre.
The game is fine and fun as it is. I'm only sad about Iris not being related (not that I didn't said that already several times), but that's probably because I love her model.
edit: misssed "of quality" when typing, my bad.