While the story isn't complete, I have to comment on its niche brilliance. It manages to have characters that are truly evil, but that I actually might want to know - while staying utterly on guard. It is a journey to an alien land.
Some, such as the protagonist, AAA and her father, Vincente, are more amoral than immoral. I suppose that I differentiate between them first with respect to killing: the first class does so because they see a necessity, while the second enjoys doing it. Torturers fall into the second.
In the real world, I don't at all like heavy pain. There have been a couple of lovely women with whom I could have fallen deeply in love, or at least involved with in a poly relationship, but were pain sluts. I simply couldn't give them what they needed.
Oddly, I'm a bit of a scholar of torture, related to my work related to intelligence. Observation: torture is utterly unreliable as a means of collecting information, but it can be used to coerce criminal or propaganda confessions. The coauthors occasionally warn "don't read the next section unless you are truly sick." That's like "viewer discretion advised" as a call to the television. The torture may have technical errors, but that shouldn't affect the story.
Since pain doesn't actually interest me, the story appeals as a guided journey to the darkest places of the mind.