Boom. Knocked it out of the park.
OK, if I was going to complain about anything, it is that the arc is utterly predictable. But that is not a terrible thing at all.
Elijah, the loud, grumpy, and older (OK, 50) DM of Black Light West is hauled to Vegas for his birthday and finds... love. Which he was not expecting. Reagan is a hospital nurse in LA, has NO experience or really knowledge of BDSM, and is dumping her utterly self-absorbed and useless boyfriend.
They hit it off oh so well, but Elijah is consumed with doubts (age gap, worry that Reagan will be vanilla by inclination, etc.). He makes the standard 3rd act screwup that almost tanks the possibility of a relationship. Then has a redemption arc.
OK, OK. As I said, the plot arc is utterly predictable. But the characters are excellent, the writing is excellent, and scenes are hot and delightful. So, basically, what really is there to complain about, right?
A great book. And, yeah, I wish Black Light could go on forever.