I love this story! Of course, I liked the original drabble written by RB, but I really love where you've taken it.
The horcrux adventure was well done (and BTW, cup or locket makes no big difference; the way you did it was fine).
I hope Selene lives to see her kidS go to Hogwarts.
Thanks for writing this "Little Harry" and "Little Luna" adventure. I look forward to reading the other existing chapters, and for new ones to com (I hope!).