I liked it. A lot.
I love the concept of three stories showing three different characters dealing with the after-effects of the war. One of them can deal with it only with a friend, one seems to be going PTSD and one seems to be trying to romanticize it. They are all dealing with it - nineteen years later or more. Your story shows what happens after the movie- after the climatic action sequence, and that is where its beauty lies.
I also really appreciated how you wrote the three different POVs. We have never been seen Lavender's POV in the series but your confidence in your writing and your skill (of course) did not let us doubt, even for a second, that they were Lavender's thoughts.
I like your writing style a lot too. You didn't say that things were as they were directly. You implied them. Just how thoughts are and POVs should be.
Great story! I would love to read more work by you, fan fiction and otherwise.