I love these bits that are so much better of a plot than the canon. You write Snape, Draco, and all the other so very well.
This is really good. I love that you have the two most tortured souls in the whole of JK's story here together. Both are drowning in the complex and dangerous positions they have found themselves in. I can see how, while they do not and will not ever like one another, they understand and respect each other. And Albus's portraits were a great touch. The voice of kindness and reason there with the two of them. Very well done.