Lilly's POV
Hagrid literally banged down the door and probably scared Harry to death...

I said, "Next time, I will open the door..." He smiled and patted my head. I looked around the room and Vernon had a a gun. Hagrid took care of it, but I was focused on one thing only... Harry, I needed to find him... I said, "Harry, where are you?" He came out behind the wall. I smiled and Hagrid said, "Here yeh are..." I said "We got you something." I magically brought out the cake and then made the fire bigger. Harry asked, "Excuse me, but who are you two?" Hagrid said, "Rubeus Hagrid. Keeper of Keys and Grounds at Hogwarts... This is my adopted daughter, Lillian Evers." I smiled and said, "Lilly. Harry Potter... you have your mother's eyes and you father's looks..."
Hagrid started to make some food and Harry said, "I'm sorry, but I still really don't know who you are."
I smiled and said, "Call him Hagrid and like he told you, I am Lilly, technically his adopted daughter, and he is the Keeper of Keys at Hogwarts, except you don't know about Hogwarts..."
Hagrid said with a little annoyance, "Yeh didn' tell meh Lilly."
I said, "I forgot..." He was furious with the Dursleys...
He barked at Vernon, "Do you mean ter tell me that this boy - this boy knows nothin' abou' - ANYTHING?" Harry said, "I know math, reading, and science stuff." Hagrid dissmissed that comment and said, "About our world. Your world, my world, yer parents' world..."
Harry asked, "What world?"
Hagrid just about lost it, I could hear his thoughts, he wasn't that happy. He boomed at Vernon, "Dursley!"
I said, "Harry, your famous in our world, and so is your parents..."
Harry replied, "My - My parents weren't famous, they died in a car crash." I just about lost it, I was around 80% of the time, but telling him that! I screamed at the Dursleys, "A car crash! A car crash kill Lily and James Potter!!! It's absurd and an outrage!!! They were wizards for crying out loud!"
Vernon finally found his voice and said, "You sir have no right to say and more, and you little girl, keep quite if you know what's good for you!"
I whipped out my wand and said, "Don't you ever threatened me if you know what's good for you! Dumbledore specifically told you to tell him and I have been keeping tabs Vernon. He needs to know, he needs to know what he is."
Harry asked, "What am I?"
I started to speak when Vernon yelled, "I FORBID YOU!"
Hagrid stepped in and said, "Yer a wizard Harry." (Anyone else read that and heard Hagrid's voice?)
A silence fell, Harry began to grasp what we said. He sputtered, "A what?" I said, "A wizard, I wager a good one at that, after training of course. Just like James. Here, it's time to read your letter..." I handed him the original letter McGonagall wrote. As he read the letter, I heard questions pop up one after another... I smiled.
He asked, "What does it mean, they await my owl?" I smiled, brought out a quill, paper, and my owl Diana. I wrote, "Dear Professor Dumbledore, Harry got his letter, will bring him to get his supplies tomorrow, and the weather is horrid. Hope you are well! -Lilly and Hagrid :)"
I sent Diana out and said, "Where to start?"
Vernon interjected, "He's not going."
Hagrid said, "I'd like ter see a great Muggle like you stop him."
Harry asked, "What?"
I said, "Non-magical person. I felt sorry you ended up here Harry. Worst set of Muggles I have ever met."
Vernon interjected again, "We swore this would not be mentioned, he wouldn't know about this!"
Harry said, "You knew? You knew I was a wizard?"
Petunia finally spoke, "Knew! It was perfect Lily. My perfect sister and her perfect school. She was the favorite, I knew she was freak since she got her letter. Then, she met that Potter, got herself blown up and then, we got landed with you..."
Harry asked me, "What happened to them?"
I said, "There is another time and place for that Harry... Then again, you better know now... It started with Lord Voldemort, or You Know Who, some people are scared of his name, but I'm not. Anyway, these were dark days, dark days indeed. He knew the darkest arts. He was hungry for power... You mother and father were the greatest witch and wizard, they were even Head Boy and Girl. Voldemort wanted them on his side, it was possibly because they were close to Dumbledore or something else, but he went to the house you were staying at 10 years ago on Halloween night."
A few tears slipped and I continued, "He murdered them... When he tried to kill you, you didn't die. That's how you got the scar on your forehead... We knew, you had been touched by a dark curse. One that kind can leave that kind of scar... You lived the killing curse... Hagrid, Professor Dumbledore and I took you from the wreckage and brought you to this lot."
Vernon barked at Harry, "I accept there are strange things about you, I will not have you go to a old house just to learn from a old crazy man that is insane!"
Hagrid snarled, "One more word Dursley and you will regret it!"
His face turned pale and nodded. Harry asked, "What happened to Vold-You Know Who?"
I said, " Many say Voldemort died, but I say different..."
He said, "I can't be a wizard, I'm Harry, just Harry..."
I laughed and said, "Anything ever happen when you were, angry or scared, something unimaginable?" Harry's eyes grew big, I smiled and Hagrid chuckled...
He said, "Harry Potter not a wizard, you wait, you'll be famous..."
Vernon interjected, "He is not going!" I smiled and said, "Lily and James Potter's son not going, a Muggle like you wouldn't be able to stop him. Albums Dumbledore..."
"I WILL NOT HAVE SOME CRACKPOT OLD FOOL TEACH HIM MAGIC TRICKS!" yelled Vernon.
Hagrid whipped out his umbrella and I took out my wand we yelled at the same time, "NEVER INSULT ALBUS DUMBLEDORE IN FRONT OF ME!"
We swished and flicked our wands trying to turn Dudley into a pig, but it didn't work. He only got the tail, but still just as funny. They pulled him into the room and shut the door.
I giggled and Hagrid said, "Shouldn'ta lost me temper.. Meant ter turn him into a pig, just wasn't much left ter do."
I said, "Just don't tell anyone Harry, Hagrid isn't supposed, he got expelled in his third year... Dumbledore let him stay though, great great man..."
He asked, "Why were you expelled?"
I said, "It's getting late, we have loads to do tomorrow." Hagrid gave Harry his coat and I fell asleep in the corner by the fire...