Where to start? I loved this, in its combination of original ideas and its deadly faithful representation of the wizarding world's attitudes to Harry: blame, scorn etc for stuff that's not his fault, and Harry's responses: self-destructive closing-in, and assumption of select responsibilities. You did canon Harry and his world so perfectly! (I might have a few reservations about some aspects of the plot, like Hermione's inability to protect herself, but this recreation is outstanding.)
Harry is a nice guy, and yet so utterly unobservant (of himself as well) and clueless – as if his loveless upbringing has disconnected him from empathy in some ways, though not in others; and he never tries to fix this: a permanent blind spot. You do that Harry wonderfully. But yours is also the same Harry who cares for other people: his determination, rueful but quite lacking in bitterness, to care for his child, but also his repeated attempts to make it right with Hermione, his patience with Millicent's anger, though he doesn't really grasp her pain. (I'd have liked to see that interaction developed further – Harry missed an opportunity there, both to connect with another Slytherin and to act on his remorse.) And as in canon, Harry can learn some things: reach a never-spoken understanding with Snape, sympathise with Draco (and help him) despite continuing to dislike him.
And that's before the great notion of the pod and the day-to-day depiction of Harry's relationship with it, developing the kind of feeling a mother has for her unborn child. Then the curse – Snape's horrifyingly vivid visualisation of it, whereas all Harry perceives is white noise, so loud it even conceals the pain. The incompetence of the teachers to see something's wrong (and not just with Harry), and rejection of their responsibility even once it's pointed out ... boy, that's canon!
This story brings out some of the ways in which the wizarding world is broken – and no one's anxious to fix it. Not even Harry, who has motives and possibly some leverage, but who is too broken himself. Or Snape, whose remoteness from Harry lets him observe more truly (and that's a positive change!), but who can't make more than those (heroic, for him) efforts to help.
I was quite happy with it being a strictly mentoring story – and the development of that relationship was beautifully done, one of the personal relationships that comes over as real in its slow growth, its understated expression. Then you surprised me with Harry recognising his own change of feelings towards his mentor and, however cautiously, opening the door to acknowledging and following up on them. Lovely, so delicately done, so right after all the punishment Harry's taken for his vulnerability and ignorance. Poor Severus, destined to live in hope and fear yet again! But this time the hope should be stronger, and better based.