This is absolutely fantastic. I love the very Slytherin mindset Narcissa displays here. How she and Severus *both* know his life is in her hands and she then acts with full knowledge that he'll be indebted to her.
And for a fic with no smut it had some terribly hot and smutty overtones!! Just OMG the idea...
*fans self*
Severus/Lucius is totally my favorite pairing and adding Narcissa's viewpoint here was perfect.