I'm still confused on why you're writing a fic for the art. Was that pre-arranged?

That's a beautiful piece of art, but I'm gonna have to go with hallucination.

On whose part, I'm not entirely certain. I could make a case for any of them. I'd probably go with Harry, tho. This could be one of those things where he's dreaming and sees his Patronus come up, then his patronus turns into Draco, then Snape shows up and they fuck, and Harry wakes up going "Uhwahh?"

Just my two cents.