A/N: I don't own Harry Potter.
Albus Dumbledore POV:
That was before that one day.
The day that changed everything.
It was an average cloudy English day.
We were dueling outside, with the new spells you had just learned.
I told Aberforth and Arianna to stay inside, away from us.
I couldn't risk them getting hurt because of me.
You muttered a hex under your breath.
A purple light shot out of your wand straight at me.
"Protego." I said firmly, and the light bounced away into the trees.
You smiled and praised me for being quick enough.
For not being hit with the unidentified curse.
Then, Aberforth came out onto the deck.
"You can't duel out here!" he yelled at us.
"And why in God's name not?" you yelled back, apparently frustrated.
"You could get hurt! I don't want to explain anything to Muggle doctors."
You began bickering with him loudly.
I was scared.
Scared that Abe would get mad at me.
Scared that you would get mad at me.
I was afraid that I wouldn't be able to see you again.
Though Aberforth was younger, he was so persistent and forceful at times.
I really didn't want to make either of you upset.
So I just stood in the background waiting for your quarrel to cease.
Then, Aberforth took out his wand.
You raised yours, pointing it at his chest.
"Abe, no!" cried Arianna.
She hated violence of any kind.
I could see the pain in her eyes when you two started to duel.
When the two of us dueled, you waved your wand easily.
You didn't try to hurt me.
But now, you had this intensity in your eyes that was completely foreign.
You shot spells from your wand, not caring whether they hit or not.
Abe threw some at you as well, but you blocked each and every one effortlessly.
The spells coming from your wand were horrible.
I recognized ones that caused blood.
Others pain, hunger, and insanity.
Ones that I'd never be able to survive.
Your battle was at its peak now.
There were spells flying all directions, and I was unable to tell who they came from.
That's when it happened.
I heard a shriek, followed by a small whimper.
The flying spells immediately stopped.
I rushed over to where a small form was huddled on the ground.
My sister was lying there, tears spilling from her eyes.
She took a deep, shuddering breath.
"It hurts, Albus. It hurt so much," she whispered.
I put her head in my lap, caressing her hair.
"It will be alright," I murmured, "I promise."
I kissed her forehead gently, feeling the warmth drain from it.
She smiled weakly, before drawing in a final, shaky breath.
That was the last breath she ever took.