And while I wouldn't consider the afterward a complete fiction, I do believe there is some symbolism in
Lolita, and Nabokov can't be as literalist as he claims to be.
I'm still interested in your interpretation. If Quilty is just some aspect of Humbert Humbert, I take it he didn't really exist, and Humbert didn't really kill him? If so, then what parts of the story do you believe actually
did happen (in Humbert's world, of course), if any. It just seems to me that you're headed down a road where the entire novel could be seen as, like you already said, a dream. I prefer to take it at face value.