I've been a silent reader for this time and I just had to say something now. I'm so proud of you for writing this story (is that weird? yeah, it's probably weird). The depth and character development you're using for Harry and this unknown female is beautiful. I can see this situation actually happening, as if you're writing from experience or a story from a friend.
It's a creative story and I'm so pleased with it. You could have done it as original fiction and never once mentioned a name and I would still be in love with it (that is not a backhanded compliment, I swear)! Your writing is great and I aspire to write like you do, with as much detail and conviction that your characters have.
I can imagine how this story is exciting to write, as it is so different from any other stories. I love letters and the movie 'You've got mail'. Can;t wait to see where you take this. Lin