AN: Hope you all like Harry Potter! This is based on loosely on The Order of the Phoenix ("Snape's Worst Memory") and The Deathly Hallows ("The Prince's Tale"). The longer, fuller version is called "The Lily I Loved," and can be found on My Stories on my profile page, and in the Crossover section in a few days when this hectic Zutara Week is over and when I had finished it.

DISCLAIMER:

I don't own "ATLA" or "Harry Potter."

DAY SIX: AU

Cold wind whipped around Godric's Hallow. People were in their warm houses drinking hot chocolate and sitting near the fireplace. But one man was alone in the graveyard, mourning the loss of his love.

Zuko knelt on the cold, hard winter ground of Katara's grave, carefully twining a blue lily around the headstone. It bore Katara's name, dates of birth and her death, and an ocean wave at the bottom. He wore a dark, black coat over his clothes and ignored the snow as it drifted onto his body. He stroked the right side of the headstone, remembering how soft Katara's cheek was and how her hair waved gently as he ran his fingers through it.

And she was gone, her body free of any markings of her horrible, tragic death of the Killing Curse. The girl he had met when they were children, the girl who was confused by her magical abilities until he had explained magic to her, the girl he sat next to at Hogwarts and on the train, the girl who let him cry on her shoulder when his mother had died or when Ozai abused her, the girl who stayed with him at Hogwarts during the holidays so he wouldn't be alone, the girl who encouraged him and helped him in classes, the girl he had held when she found out of her mother's death, the girl he protected from his Slytherin friends, the girl whose Patronus shared the same form as his, the girl who he saw alive and standing by his side in the Mirror of Erised (shows the persons greatest desire).

Katara.

His biggest mistake was that fateful day, when he had betrayed and insulted her out of frustration. He had tried to apologize to her, but she had refused to accept him back. All his mistakes were laid down on the table: his Death Eater friends, his rivalry with her friend Aang (that loathsome boy who was the Hogwarts Quidditch and academic star, and fancied Katara), using Dark Magic, and him treating her different from the other wizards and witches born of Muggle (humans with no magical ability) parents. Why, she had asked, had he not discriminated her or called her that degrading name of Mudblood before? Why was she different?

In desperation to her question, he had kissed her with a searing passion, pouring out all his feelings that consumed him, built up from the time they were children. At first, Katara had relaxed in his grasp, winding her hands in his shaggy black hair, as he caressed her hair. He was on fire, elated withy joy as they kissed in front of the portrait hole that led to her dorm room. Then she pulled back in an abrupt and startled manner, and confessed to him. The last words he'd ever heard from her mouth. I did love you once, Zuko. But I can never forgive you now.

She and his rival, Aang, started to go out seventh year, the last year of Hogwarts. Then they had married. He did not come to their wedding. Nor was he invited. Katara Potter had forgotten him. She refused to answer his letters, slammed the door in his face when he visited, and glowered at him if she saw him.

Zuko joined the Death Eaters, the followers of Sozin. He was angry and hurt, taking it out on every victim he killed.

He had heard Headmaster Roku give an interview with Aunt Wu at Hog's Head, applying for the job of Divination (aka fortunetelling) at Hogwarts. Aunt Wu had gone into a trance, screaming loudly of the prophecy that killed Katara and her husband, and their son, Tenzin.

"The one with the power to vanquish the Dark Lord approaches...Born to those who have thrice defied him, born as the seventh month dies...and the Dark Lord will mark him as his equal, but he will have power the Dark Lord knows not...and either must die at the hand of the other for neither can live while the other survives..." Zuko had, however, had no knowledge of Katara and Aang's son, and he had ran to Sozin like the coward he was and repeated the prophecy to him. Sozin had nodded solemnly and had left on Hallow's Eve. With two waves of his wand and the Killing Curse, he had killed Aang...and Zuko's love, Katara, when they had refused to hand Tenzin over to Sozin. They knew the consequences, and their sacrifice put protection on little Tenzin. An one year old had survived the Avada Kedavra, making the Dark Lord have his magic turn against him and be vanquished.

Zuko had screamed in remorse when he had heard the news. Did you hear about the Potters? Yes, they died just yesterday, but their son...The Boy Who Lived. He defeated Youi Know Who. But his parents are dead...

God, no...Katara. It's my fault! Zuko had immediately went straight to Roku, the greatest wizard, pleading on the ground for him to spare him and that he'd do anything to bring Katara back.

There is no spell to bring back the dead.

But you have to try, please! I'll do anything!

You feel guilty for Katara's death, don't you, Zuko?

It's my fault! If I hadn't relayed the prophecy to the Dark Lord...she would still be alive! Married to Aang, yes, but alive!

Her boy lives. He looks like Aang, but has the eyes of Katara. You remember the color and shape of her eyes, don't you?

Don't! Gone! Dead!

Is this remorse from a Death Eater, Zuko?

Yes, it is!

The boy needs protection. The Dark Lord will return, I'm sure of that.

I'll help protect her son!

You swear, Zuko?

I swear on my life, Professor.

So Zuko taught Potions at Hogwarts. When Tenzin had came, he looked like the spitting image of Aang. The same messy black hair, the gentle and calm expression, the short stature, and had the scar, the only mark of the Killing Curse fired at him on that fateful night: a lightning bolt. But with Katara's eyes, her beautiful blue pools of the deep.

He detested the boy, even though he was supposed to help protect him. He was reminded of Aang, the man who married Katara and stole her away. How long had he wished for Katara to be with him, in his arms, for her to lie next to him in the evening and morning, live a happy life with her.

He was a spy for Roku, when Sozin had returned. He played his part so brilliantly he had even the Dark Lord fooled. But his loyalty was not to Sozin, or his Death Eaters. No, it was for his dead love, Katara.

At the night of the final battle for Hogwarts and his death protecting Katara's son, Sozin had killed him. Tenzin and his friends, Meelo and Korra, had rushed to see his life's blood pouring out of him. He raised his wand with the last of his strength and placed it towards his head, the silvery strands of his memories following it. Korra had drawn out a vial and collected it into it, giving it to Tenzin. Hopefully, he would understand what had happened and why he did all this. He felt his mind and body slow and beckoned toward Tenzin.

Look at me, Tenzin.

Katara's eyes had pierced his own, and he felt at peace as his body slowed down and drifted away...

AN: This is pretty short compared to the extended version! So I hope you liked it; this was fun to write.