This was really lovely. I loved how in character Harry,Severus, and Hermione were. I really loved the nature and logic of the soul bond as explained by Hermione. It totally makes sense. Harry's obsession with the HBP is one reason I can find Snarry believable and the way you worked that into the fic was lovely.
Really, really enjoyed this. Lots of fics have porny bits and yours were lovely as well. What is more important to me lately is that the supporting bits of the fic actually make sense and make me care about the characters getting to the porny bits...and you did a wonderful job of that.