Hi Belle! Big fan of your game. The way you write most girls in this story is pretty nice. In terms of writing for games like these, you're certainly the best. But I have some small criticisms and things I would like to see in upcoming updates maybe.
- Small events where the girls interact with eachother especially towards the beginning of the game. Doesn't even have to be sexuell. A few more date events to really get to know the girl casually is something I also wouldn't mind
- Sometimes the banter between Belle and the Main character gets in the way of the serious scene. For example, when the sister leaves behind her letter and MC reacts to the message, Belle's comments really took me out of the scene.
- The sex between the MC and sister after they confess to each other should get a few more positions. Missionary for the entire scene was a tad bit bland. Dialogue was top notch though.
- Seeing Belle full body while talking to her would be nice. The game doesn't have enough different sex scenes with her currently to encourage buying new clothes.
- Don't know if you got this planned but a "After Story" event for some girls would be really cool for people who want to enjoy some postgame without having to do new game+.
That's everything. Hope you didn't mind my little suggestions and I'm excited for further updates.