Ah!  Looks like this one's shaping up to be even better than your last (at least, the last one I read).  A couple of lines stand out in their amazing-ness, lol: when "the last living Marauder looked back" I nearly started crying right then!  Also, Petunia's statement about Lily, calling her "my sister" in such a context was really moving. 

Of course, when Vernon died, I nearly started crying, too... which just goes to show what good writing can do, because I didn't give a hoot for him before I read this story... likewise, your tactic of Harry taking the Dursleys through one at a time created a lot of tension and really tugged at the heartstrings.  Good work!

-K