Blame: Petunia finds Lily's photo album at 16 years old.
Mrs Petunia Dursley
4 Privet Drive
Little Whinging
Surrey
The package, though it had appeared rather suddenly, was for once not labeled in that odd manner Petunia associated with their kind. Feeling a good bit of curiosity and wondering who had sent it to her (for there was no return address), Petunia Dursley set the package on her kitchen table and opened it.
Inside was a somewhat large album, the kind in which people put photographs, or stamp collections. The pages were a kind of creamy-colored cardstock, Petunia found before opening the dark blue leather cover.
The Memoirs of Miss Lily Evans in her Sixth Year of Hogwarts School of Witchcraft and Wizardry read the first page. Petunia nearly shut the book and threw it into the fire right then and there. What stopped her was a little voice that kept whispering to her.
'Don't you want to know what Lily was like while she wasn't at home?' it said. Petunia was loathe to admit it, but she had always been curious about her sister's school, so against her better judgment she flipped through the pages of the album.
Many of the pages contained some candid shots of a boy who could be none other than Harry's father with a group of three other boys. There were pictures of different groups of students, and even some of people who were obviously teachers, but very few of Lily herself. Whenever she came across a snapshot of her sister, Petunia felt her throat close up and her eyes start to tear. She quickly flipped the pages to the end of the book.
On the last page was a letter written to Petunia herself.
Petunia, it began. If you are reading this, then I suppose things have happened that we'd hoped would not. I'm sending this to you (the postman has rather specific directions) because I know how you felt about me and my school. Just know that I've always loved you, no matter what my temper made me say.
It was signed Your sister, Lily.
When Vernon Dursley came home from work that day, he didn't ask about the addition of a blue, leather bound album to the bedroom bookshelf, or the fact the his wife had red eyes and a slightly puffy face.
Owari