Wow! That was superb! I wish it had happened that way in the canon fic, that Harry had come to realize Severus' incredible bravery, intelligence and skill... with Severus' recognition, understanding and appreciation of Harry. I wish that they could have been made a couple - but this way, we get to read myriads of excellent variations on that in slash fandom. I knew the straight fandom wouldn't bear it, in some ways i feel sorry for JKR! - But it was wonderful to see their relationship develop in this fic. All the little endearing vignettes that show their caring develop.
The only thing was - I almost didn't read it (that would have been my loss!) - because I was afraid they or Severus would die in the end. I 'cheated' by looking at the end, and found to my delight that was not the case. then I was happy to partake! There may be others who skip the fic due to the same fear - possibly, you could reassure them by calling it a 'pseudo-death'?