Wow, this is freaking gorgeous! Whoever you are, Mystery Artist, you have a talent with the pencil and detail. This could be Draco's fantasy or it could be the passage of time and he's just remembering. I think that's the beauty of this piece. The viewer can imagine what they want to imagine. I LOVE that. :D My favorite panels are: where they are entwined in the water, the shattering glass, the long view on the store with all the detail, like the books, etc, etc, and the last panel, which is their hands. What a wonderful story you have weaved here. :)
As for me, I rather not choose if it's a fantasy or recollection. It can be both, and I rather it stay that way. So I am undecided! ;)