Disclaimer: FanFiction dot net. If I'd written Harry Potter I think I'd just publish all my stories on Pottermore and make them mandatory for anyone wishing to progress, or in the very least I'd have my own website.
A/N: First draft. I'm lazy. Word edited some of my mistakes, if you see any more I'm sure someone will be grateful if you told. Possibly Bill Gates, most probably not.
Petunia Dursley hates letters. They never bring anything good. Not to her, anyway. Secretly she knows this doesn't excuse her treatment of Harry, but she still blames Dumbledore—she even blames him for Vernon.
[-]
They told her about the Potters' death, that they were hit with the killing curse, in a letter—although Petunia didn't know what the killing curse was, since Lily had never told her—and that Harry had survived. Petunia didn't know why this made Harry famous, only knew it did.
She knew about the blood wards, though—and couldn't Lily have saved her son another way? One where he didn't have to live with her. Her mind helpfully adds 'one where he got put with a Potter.' Not even her subconscious dares add that then Lily could've lived with James' relatives too.
When Harry asked how his parents died she told him a story she understood. People died in car crashes all the time. And when Harry turns his teacher's hair blue and Dudley thinks it's brilliant she moves him to the cupboard—like Vernon always suggested.
[-]
But when she finds out the escaped convict, Sirius Black, is Harry's godfather—godfather!—she wishes desperately that they'd've sent a letter. His life was in danger and they didn't tell her, and she wondered if this meant Dumbledore knew how they treated Harry, and why he still let Harry live here. She wonders if he'd ever been in danger before and they hadn't told her.
When he comes back next year he has nightmares, and Petunia once again wonders how safe Hogwarts really is. It was safe when Lily was there—wasn't it? (Maybe they never told muggle parents anything.) But Petunia knows she can't keep him from going back any more than she could've sent him off without his Hogwarts letter. Any more than she could've sent Dudley—and she forgets all about Hogwarts safety. Until the next night, when she lies awake listening. And the one thereafter. And the one thereafter that.
Cedric. She learns to hate that name almost as much as Albus or Dumbledore.
And then there was the howler telling her she couldn't throw him out, not even to send him to his godfather, who surely could protect him better that they could—Harry wasn't even allowed to use magic to defend himself and her family from the things they sent to kill him.
When they finally take him she forgets all about the nightmares.
Next year they tell her Sirius Black died. Petunia wonders where Harry was when it happened.
And when Harry turns 17 he's gone. Petunia still doesn't know how close he's been to dying, or if he has a chance to survive, only knows that Lily's son is fighting in a war he shouldn't have to fight, to save the people who killed her sister, who tried to kill Harry too.
She hates not knowing. All because of the first letter that didn't come. Not to her, anyway.