OMG that was fantastic! There are too few excellent Harry in Azkaban stories. I loved the characterizations and their relationship.
It seems like, if Lucius can be believed, that Severus will win his freedom either way, no matter Harry's outcome. I'm just not sure I understand why Lucius promised Snape his freedom after Harry's death. For a moment, I was terrified of a double cross (which would have broken my heart).