If you're expecting porn, which given the covers of the 'Shadow Assasins' series I guess one should expect, then you'll get exactly what you're expecting. Unfortunately just like the film-variety of porn there's not much substance to the story itself. Most of the non-erotic scenes mostly read like a plot device to bring the lead characters together to have sex.
As for this being labeled as Science Fiction: it's not, it's Fantasy clear as day.
Sure the terminology used borrows from stories that are science fiction, sure a society supposedly in a future time is described on a non-Earth planet, there are even references to space travel and technology. None of that makes this Science Fiction as these facts are hardly used in the story itself. Everything revolves around magic, referred to as "Mystic abilities" wielded by "Mystics" some of whom happen to live in "Mystic valley". All of those references to "Mystics" are given in the first few paragraphs of chapter one, clearly marking this story as Fantasy.
Don't get me wrong there's not much wrong with Fantasy. But labeling a story as SF creates expectations, that this story failed to meet. Though truth be told I wouldn't have liked this story if it were labeled Fantasy either, because of every non-erotic scene reading as filler material to connect the erotic scenes.
(reviewed 5 months after purchase)