There is nothing really terrible about this book, but there's nothing really good about it either. A thin plot is stretched to its shredding point to cover the bare bones of a series of sex scenes, and don't look for plot holes, because you will find them. For example ***MINOR SPOILERS*** the H purchases the h as a slave, even though he's worried about feeding his current household. This problem of food is never brought up again. Later, he throws a spur of the moment party and buys his slave a fancy dress, and no one thinks that's weird, as they dance together at the fancy ball.
The world-building is minimal. There's not even an attempt at an explanation of the heroine's special powers, and all the characters are one-dimensional and flat. They are so vague that the author doesn't even bother to introduce most of the secondary characters, though later, the reader is expected to know who 'Leo' is and, jeez, I can't even remember the other guy's name. It took me almost half the book to figure out what relationship one of the more significant characters had to the H. There are no morally-ambiguous characters; they are either 'good' or 'bad.' I had hope for the housekeeper, thinking the reader would be treated to at least one character progression arc. Nope, she has no depth at all.
It's not quite insta-lust between the two leads, because the H waits until after the h has taken a bath, before sexually pressuring her. Of course, the bath takes place like ten pages in, so.... And, of course, the H and h are good-looking and 'good,' so they fall in love.
It's a shame, because the author had some interesting ideas, but they weren't developed, and, since the next book is about the next generation, it doesn't appear that the author has any intention of adding any depth to her world.