A/N This is the non-incest version of Guardian Angel. It shows more scenes and why Fred is a guardian angel.
Flashbacks
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Identical redhead eight-year-old boys flew on their family's make-shift Quidditch pitch, dodging items they had enchanted to fly around randomly. "George! Watch out!"
With the warning, George was only just able to avoid being hit by a flying frying pan. He smiled at his brother, "Thanks Fred."
"Ha! Take that death munchers!" Fred Weasley banished a Death Eater into a wall, him and George were fighting back to back, protecting each other.
"Fred! George! Stay out of my room!" Percy threw a book at his prankster siblings, and Fred plucked it out of the air right before it hit George.
George smiled and patted his brother on the back. "Good catch."
Percy ran over to the twins, spun around, and cursed a Death Eater as it tried to attack his family. He saw Fudge, and slammed him into the wall with a spell shouting, "Oh, by the way Minister, I resign!"
"Filch is coming! Hide!" The twins ducked behind a tapestry. "George, there isn't enough room back here for both of us."
"Fred, you are not going to get caught on purpose- Ok, don't listen to me."
"Weasley, DETENTION! We are going to see the Headmaster."
"Percy, you're joking! You're actually joking!" Fred threw back his head and laughed out loud.
"Avada Kedavra!"
Fred collapsed, the smile still etched on his face, stuck in an eternal laugh, even as the life fled his body.
"Fred!" I pushed my brother's death out of my mind and continued fighting, but as soon as Harry killed Voldemort, I ran over to Fred and stared down at his lifeless face. Even knowing he had died how he wanted to, I couldn't help but cry. I knew things would never be the same. How could they be when half of me was gone.
Fred had asked in his will not to be buried without me, so he was placed under stasis charms in a private room at the ministry. I knew what I had to do, and I wasn't going to let Fred down.
I threw myself into hunting Death Eaters down. I had to be useful. Everytime I stopped, I thought about how things should have been. Fred and I would have gone back to the shop, he would be with Katie, and in a few years they would have kids. I would be the rich uncle that spoiled Fred's kids.
I had to take Dreamless Sleep potions every night just to keep the pain away. Finally, 2 months after Fred died, the last Death Eater was caught and sent to Azkaban.
That day, right after the trial, I went to the room where Fred's body was. "We did it. It's finally over. Now I can rest."
I laid down beside my twin and raised my wand to my head, a smile on my lips. "Avada Kedvra." As I uttered those words, I felt my brother's presence and a great sense of calm and peace. We were together again, and this time, nothing could seperate us.