Some notes:
There isn't an aspect of choice in the game so much as you have to find the "right choice" through context and clues, this game would be more interesting if you got her to open up more in different ways through different events that you had to pick between, like how shes always at the pool from 2-4pm, but if you went to the pool at this time you could get her to open up with the bj stuff in the pool and that made her more open to oral sex, but if you instead hung out with her in the dining room you would talk to her about opening up to something else, and the photo shoots would be at this time and would be about getting her to be a voyeur and then you start catching her masturbating or something, and if you injure her in the bathroom you start to open her up to anal sex, but you could be halfway done with the game and getting certain kinds of sexual favors from her and not having her be open to others at all, or even, it could be impossible to open her up to everything at once so you have to have a few playthroughs if you want to really take advantage of her in every way possible
games that are like this game but not nsfw get less grindy as time goes on not more grindy, meaning that you have less time spent finding the dungeon and more time playing in the dungeon, in this game it feels like the "dungeon" or puzzle we are currently trying to solve is hidden in minutes-hours of finding the right moment in a weeks worth of 17 hour days to start the puzzle and then its actually just one puzzle piece at that time
similarly the reward gets progressively worse, early on you find a puzzle piece and you get her to start walking around next to naked from fully clothed just by ruining some of her clothes, but later in the game you get her to do the exact same sex scene you've already seen 7 times and this time she puts your dick about an extra centimeter into her mouth from last time (ONE FRAME?!?) and then she stops, and you have to grind another week or two to find the next puzzle piece which unlocks the ability to do all of that again for another centimeter of cock in mouth, if the new scenes were a little different and ended up having her take a little more penis overall but with a few more different frames of how to get there it would be more rewarding
it doesn't seem well thought out to have the second girl follow the same basic progression and storyline of the main girl, i get it, they're classmates, and her current landlord could legitimately have the cops called on them and instead you just slide yourself into that spot so you haven't come up with a new way to trick someone else into sex, but it still seems bland and then easy to replicate the success you've already had instead of having to come up with new tactics