I used to play this game just because of Hinata and Himawari, but unfortunately we never got any seduction-themed gameplay with them. It seems like whenever things start to move forward, nothing ends up happening in the end...
I hope they become the focus of the game, and that the protagonist gets to have a forbidden romantic relationship with them—then I’ll rush to subscribe to the Patreon to play early.
The game is really good, it has potential, and there's no need to be afraid of delivering content involving Hinata and Himawari. There's a lot that can be done.
Hugs and all the best!