This is how you know this is a NTR game first with non-ntr added on. Anytime the NTR character gets to fuck way before the MC that tells you all you need to know.
I mean.. does it matter? If a game has both options, why would it matter which route gets scenes first?
Such a weird metric to judge by because it doesn't actually mean anything, if you like the vanilla stuff then you can just chill until next update, no one is forcing you to play an update as soon as it comes out.
Honestly, I never even thought about this game in terms of vanilla or NTR routes (until seeing the above discussion). The way I've played it from the beginning is just to do whatever is necessary to get every available sex scene with every girl possible. The large majority of these scenes for me have been with the MC, with only a slim minority without the MC.
I've been having fun with the game otherwise too, as I like the story and the different looks and personalities. I usually stay away from AVN games that involve a lot of grinding, but the way this game is set up, I find the grind to be enjoyable, which is enhanced by clearer instructions on what to do in relation to different characters as well as a clearly visible points system.
Though I tend to focus on viewing the scenes with the MC (which is most of them anyway), I view the other scenes out of curiosity too. Besides, the MC has such a high frequency of action with such a wide variety of female characters that I don't much care about the occasional scene with some other male character. No one but the MC can knock them up either.