I posted in other review for one of your stories that I adore dark, bitter, heavy stories. It seems I found an author who fulfills my preferences ;)
First of all, this is not the darkest of your stories. Yes, it keeps a resemblance to deep opaque aura. I think writing about Bellatrix in any way must include such atmosphere.
Then, there was this thrill. Chills that ran down my back as I was reading. Different from the tingling sensation that Bella felt with Voldemort, but also hypnotising. It was always one of my favourite aspects of Bellatrix and Dark Lord's relation - it wasn't love, it wasn't an affair, we all know that. But we can't deny there was something. Tension, understanding or simply loyalty, but it was. And I'm crucially against versions where Voldemort doesn't care about Bellatrix at all. He doesn't love her for sure, and does not confide with her. But he did take her with him from the Ministry! He was furious when Molly killed her! Anyway, back to the story... ;) Voldemort is manipulative and knows how to mesmerize Bella for his benefits, but she's the only one he even tries to be delicate with. Any other Death Eater, he would simply make a demand. He wouldn't make any efforts.
With Bella, it's a bit different. He likes being charming and close to her. Maybe it provides him with other kind of power. And Bellatrix isn't stupid, she knows there's a fine broderline. Yet she devours every single second of it.
The dance was something more.
It was like a metaphore. Symbol of the real "dance" they're making - tiptoeing around each other. Her obsession and devotion, his teasing, his power and leading role. I imagine each time Bellatrix and Voldemort are talking (even if it's about a particular mission), they in some way play with each other. Bella knows he's manipulating her, but she let him do that as long as he provides her with this thrill.
Summing up, this story is more wicked than it looks like. You used the flickering noir vibe to create something that seems simple, but in the end, when you re-think it, it turns out to be a portrayal of peculiar relation.
Author's Response: I think Voldemort/Bellatrix is an interesting ship. It's not really love; more like a dark obsession on her part and a manipulation on his part. I think they would have been nearly unstoppable had they found more of a mutual respect for one another, but even as is they're quite scary. I also find it hard to believe that he didn't think of her as being a bit different, considering the way he reacted to her death and his tolerance for her reckless behavior.
I think Bellatrix treats Voldemort like a drug at points. She probably knows intellectually that he isn't always good for her and that she's being used, but she craves him too much to give him up. She's always chasing him, and she'll give up anything she has to.
The dance wasn't a popular move among all readers, but I wanted it to symbolize the way Voldemort can specially charm Bellatrix even beyond the way he charms everyone else. You can't deny that he has his own sort of gravitational pull, especially in his more "human" form, and no doubt he knows it, too.
I'm pleased that the noir vibe worked well for you here, too. Thanks for your awesome review!