Short and sweet and altogether lovely! I think your portrayal of Snape's attitude is spot-on. It doesn't surprise me a bit that he'd simply walk into the hands of the Aurors; he is, in some ways, a man so focused on his penance that he simply can't see anything else. It also doesn't surprise me that he'd go on a hunger strike simply to snatch for himself the autonomy of deciding his own death.
So it's a good thing for him that Harry's around to give him something else to think about, and to jar him into at least considering the possibility that he's *bloody well paid enough* for a mistake (huge and hideous, to be sure, but so has his penance been) he made when he was scarcely more than a child.
When Snape says to Harry "I've never encountered someone like you before. You intrigue me, Potter," I think that's perhaps the most important part of the story, because it's a tacit acknowledgement of the fact that Snape has, in fact *never met* Harry. He's seen and interacted only with his own (distorted) image/idea of Harry, a stand-in for James, a reminder of Lily, and it's lovely to see him willing to take another look and discover who Harry is in his own right.
And I love the ending! Harry may not know what Snape will decide, but I'm pretty sure I do. :) Well done!