Of all the episodes of Sanguine I wrote, I think this one highlights my thinking most clearly.
Put briefly, it's a philosophical exercise of sorts. I lifted Herabella's dialogue about Cat almost directly from conversation I have personally heard at my workplace. It was about a certain dog, which is somewhat ironic now that I think on it. In any case, it occurred to me that such discussion would be monstrous were it to be applied to people (not that it never has been, unfortunately), so I made monsters to do just that.
Several conversations with a fellow nerd at my work had me wanting to tell a story wherein humans didn't really matter for a while, and Sanguine is that story. It struck me that there are so many tales wherein angels, demons, gods, vampires, high elves, immortal aliens, or whatever else with active interests and ambitions, but among them all, humans still tend to have the run of the world. There are a hundred ways to handwave that, of course, but it mostly comes down to the trope "Most Writers are Human" .
I'm not immune, really; for all their power, blackbloods still assume human form more often than any other. No one thus far has brought up to me the darker implications blackbloods casually gloss over, but I do hope those who read are picking up on it.