This is slowly becoming one of my favorite books, I really hope it sticks the landing. I love the jumping in and out of the epistolary mode.
I also love the expression of lesbian sexuality in a way I don't get to see too much in fiction lately, so much I've encountered left it as a barely spoken of aspect of a character but in here it's made abundantly clear how much these characters want each other both romantically and sexually. And this is one of the many reasons I love the horror genre.
And if anyone else has recommendations for novels featuring lesbians who want each other carnally or doesn't shy away from that element of their lesbian characters I'd very much appreciate them!