Played it. Just a note, when it comes to VN's I tend to enjoy the story that's being portrayed more than the sex scenes, the sex scenes are a bonus. The only time sex scenes > story if I'm too horny LOL.
What I like about this first chapter of the game, you are trying to tell us that MC and Natasha are very loyal to each other, loving each other, u want ask the player to understand their bond. To me that's great so when small cracks start to form on Natasha, (hope it's not rushed but done right) it will make us feel what the MC is feeling especially with the monologue/thoughts dialogue you do. For me the way you introduced each character was enough to a point I kinda understand who is who, and what they meant to MC. If the dev is planning to make the project longer, more than maybe 7-8 patches the slow burn is done nicely, I can see that we finally see penetration may it be NTR or NTS like very late, which I prefer as someone enjoys being immersed in the story telling.
Saying it again, I enjoyed Chapter 1 being the way it is to learn bond between each characters so what happens next can impact what we feel as a player. Great job on that.
I am very excited of what's coming with the game, despite there's no scenes in the first chapter that should make me feel worried a little bit of this and that did manage to make my heart beat faster just like the MC monologue/thoughts describing. If you done it right, I think I would place ur game Top 10, but for now with only Chapter 1, and very promising pace and story. I am definitely looking forward.
Note: This is my opinion, my take on how I enjoy the game <3