Aw, I can already imagine the angst of the fic, when Draco finds out that Harry only did, what the head auror asked him to do!

I agree with you on the part that Harry wouldn't have feelings in the category of love towards someone he didn't already have a friendship with - or at least knew and saw regularly (as in fics, where they work together as aurors or the like)
- Draco on the other hand would be much more likely - and cunning enough - to follow, say, Harry's life closely from affar (through friends they have in common or something) and graduately fall in love with him - without noticing it of course.

Anyway, good luck with that story! I'll make sure to read it.

Sincerely,
Sofie.