Absolutely incredible piece of work. I've been a fan of yours every since reading Ashley's Secret years ago, and I've only just stumbled upon this one. As you might have guessed, I'm a HUGE fan of this sort of dark lesbian erotica, which is sadly rare. But this piece reads like a magnum opus of that very niche genre. So imagine my suprise and delight when I realized that it had not just one chapter, but 9! Reading this has been an experience. Very brutal, very erotic, but also very well written both from a technical standpoint and also for characterization. The psychology of your characters is believable (and sometimes chilling). I especially like how you manage to capture the thought processes of both Mabel and Pacifica in the unique ways they react and how it informs their decisions.
I hope you consider writting more. And even if you are finished, I want you to know that I think this is one of the greatest fanfictions I've ever read. Keep up the good work.