I think the best type of nsfw games are the ones you actually start giving a crap about the characters. It's a A+ game. I made a comment on another game couple hours ago saying I have a love hate relationships with Novel Games because a lot of reading but great story.
This game started off as a , right into the action, to a shit, these characters give off those somber vibes, yet they also give off a warmth; ike just enjoy the moment while we have it type vibe.
(I know the game isn't finish yet, but I do hope we get to see more the characters real sides if that make sense. Options or just based storywise of getting to them better. Either way is really great. Be proud of yourself and take your time.)