Honestly this was pretty good. It has a nice build up for some supernatural elements in the future, which with all the story talks, seems like it might happen. One thing I'd definitely suggest, is maybe a new title for the game? Sexual Interest doesn't really fit, unless you're just trying to have a porn-y name for no reason. I think just simply calling it Puritygrove would be better. It doesn't give off a purely aggressive sexual tone, and it fits better with what the game is actually about (since the game centers around solving the mysteries of Puritygrove).
MC is surprisingly mature, which is nice for a change. He has some moments where he can be a bit pervy, but it's not over the top like other games do. It's at least somewhat tasteful and not creepy. So A+ for that. Always nice to see a mature MC who isn't thinking with their dick all the time lol.
Some minor grammar errors here and there and some translation issues, but it doesn't make things hard to understand. Just a little clean up and it will be fine. The writing is actually well done regardless of that.
My only gripe
is the forced sexting with Mandy. Not a fan of forced content like that. It just felt out of place and only added to tick a checkbox for lewd content. Maybe have that changed to be optional/avoidable? It just feels like a betrayal to Brianna to be doing that with her sister behind her back. I'd rather have the option to just say goodnight and avoid sexting her. Hopefully that stuff is always optional in the future (who we have sex/relations with).
Gotta get used to these graphics though. Usually not a fan of this style, but I've slowly been trying to get used to it. This is the second game so far that I've enjoyed with these graphics (other is Twinewood), so it'll take some time to get used to it, for me at least lol.
But yeah, otherwise, not too bad. Curious how the mystery element is going to play out, and if indeed it will have some supernatural element to it as well. But definitely enjoyed it so far. Thanks and best of luck with your project.