Nawww I'm sorry to cast you in despair! If it helps any, I like to think that this little side-story fits into that gap somewhere between the last chapter and the 'Ninteen Years Later' epilogue. So really, what happens is that Ginny barges into the room, smacks Harry around, dresses up like Snape and Harry eventually busts into tears and confesses all of his angst. And then Ginny's like "Uh, dude, I'm in labour, sorry to barge into your weemo" and then they have baby and Harry forgets everything except how happy he is now that his precious angel James Jr is born.
The end! See, I did have it all planned out for a good ending, really I did. ;D