I'm a sucker for this sort of scenario--the house-arrest. Snape was so appropriately maudlin and Harry chipper. Woah, spanner in the works with what happened to Harry, but I love how you did the 'reverse' dynamics.
Hermione was a treat in this too; that scene where Snape goes down for a book make me grin--I could just picture the whole thing in my mind.
In the end, I like how Harry waited, and that Snape decided to take a chance. Hot sex, wonderful repartee between the two of them. Wonderful job!