This is just amazing. I love that you chose Severus and Petunia's perspectives for this. Petunia is so well rendered here, fully three dimensional. Even if I can't ever really like her, I can understand her so much better. I loved the interactions between her and Severus--her reaction to him saying they were married, the story about Diagon Alley. How she cleans as therapy, her nervous habits, her clear genuine love of her boys. The magic surrounding Harry's illness and cure were also so well done. A heart-wrenching tale but never over-dramatic or gratuitous. Absolutely reads as real life. People are complicated, they have warring emotions and you captured all of that so well here. Incredible work.