While I definitely agree that it can help elevate the NTR, a good story can only take you so far, and most NTR plots are fairly nonsensical or shallow by necessity. As it turns out, writing a good story where the lancer is a complete bastard, the love interest is a cheating whore, and the protagonist is blind and naive as a newborn half-deaf bat is fucking hard. And while it definitely heightens the experience, most people just don't care all that much about story in these types of games.
Either way, generally speaking unless your game is highly story-driven, it's not that great of an idea to start really going in on the story when you're still in the beta stages for the actual gameplay mechanics, which this game definitely is. As I understand it, when it comes to game design you don't really want to start implementing the story until you have the basic foundation to put it into, that being the gameplay mechanics. Until those are at least mostly in place, the story usually remains primarily on-paper.
Basically, I would keep your expectations low. This is (as far as I'm aware) being made by a single person, and it's still an extremely early prototype of the eventual final product. From what I've seen the story doesn't appear to be a priority at the moment, and probably shouldn't be until the basic mechanics are fairly well hammered out. I'd imagine the most we're likely to get for a while is maybe an intro sequence or some such.
