Author Note: This is a bizarre story, so don't take it seriously. :p

Chapter 1: The Girl That May Not Have Gotten Away

There was a pang of pain, a resounding shock from Sokka's eye that shook him awake. In a feeble attempt at relief, he rubbed his eye. Unsurprised, it still ached. This hasn't been the first time that it has happened. Ever since their adventures in the Earth Kingdom, Sokka's eye has bugged him. It started as a minor inconvenience, a small twitch now and then. Now, it radiates with pain almost every night. Originally, he thought it was the stress of trying to save the world, but Aang defeat Fire Lord Ozai four months ago.

Letting out a cry of frustration, he snatched Katara's traveling bag—which he knew she always had next to her sleeping bag—and managed to procure a small mirror through touch. He looked into the mirror. A vividly sky blue eye looked back at him. It looked perfectly healthy. Shrugging, he put the mirror down and snuggled back into his sleeping bag.

After a moment, he shot up into a sitting position and looked around the room. It was dark. Pitch black darkness yawned around him, with a hint of moonlight shining in from the small crack in the tent. If it's dark, then how was I able to see my eye? He thought to himself. He held up the mirror once again and gazed at himself in the mirror. It wasn't like his eyes were lit up, but there was a strange glowing behind them.

Sneaking over to Aang, he poked him on the head. No response from the monk. Sokka poked the boy again and the younger boy still didn't give a response. A vein throbbed on Sokka's head as he went into a silent fury, poking and prodding the kid.

"Gah! What is it, Sokka?" Aang cried, sitting up.

"Tell me something," Sokka said, dead serious—which naturally surprised Aang. "Can you see my eyes?"

"Yeah, so? Is that all?" Aang asked and was about to roll back over to sleep.

"Isn't that a bit weird, though? Why can you see my eyes when everything else is so dim?"

Aang was getting annoyed. He sat up again to retort, but then regained enough consciousness to realize that Sokka had a point. "Now that you mention it, I thought that was weird. I just thought that radiate eyes ran in the family."

"Katara isn't even awake, Aang, so you don't need to put in any needless compliments into the conversation." Sokka said, his eyes showing annoyance.

The Avatar blinked in surprised and said, "Wow! You also have the same annoyed expression!"

"Aang! Isn't it weird? Do you think this is…Avatar stuff?" Sokka asked, sounding genuinely concerned.

Aang took a moment and looked at Sokka in the eye and said, "I am feeling that there's something weird about it. It actually might be Avatar stuff. I'm detecting the presence of the Spirit World."

Throwing his covers off, Aang took a meditation position and closed his eyes. When he opened his eyes, he was sitting within the tent, but saw his body sitting beneath him. In the place of Sokka sat a cloaked figure. Taking a defensive stance, Aang called out, "Who are you? Are you possessing my friend?"

"In a manner of speaking, but it wasn't on purpose," A female voice answered, pulling down her hood to reveal the face of Yue.

With a cocked eyebrow, he looked at Yue and shook his head. "Is this a trick? The moon's out tonight and Yue exists in the moral realm!"

"But I can communicate with you through the Spirit World," She retorted. "In the mortal world, I'm just the moon. Or, rather, I'm not really me like this. I'm a part of Yue: the part of her that she gave to Sokka that night when she became the moon. She didn't realize the consequences of such feelings at the time.

"When a powerful spirit, such as the moon, makes a contract with a mortal, it changes that mortal forever. In this case, it was an emotional contract, but it is a contract none-the-less. I was created that day and it's thanks to my help that Sokka became something more than just a bumbling idiot with hopeless dreams."

Pointing at her, Aang said, "Hey, watch it! That's my friend you're talking about. Also, what does this mean for Sokka? Can you leave?"

She shakes her head. "I can't leave because I am part of him. What this means for Sokka is that I'm becoming more powerful, but my strength is his strength. As my abilities get stronger, he will begin to realize he has access to those powers. It's a symbiotic relationship, you could say. I don't mean him any harm. In fact, I love him as much as Yue does."

Aang rubbed his chin, trying to absorb all of this. "But what does this really mean? What do you mean by abilities?"

"Waterbending, for instance." She answered.

Stunned, the Avatar replied, "Really? I think Sokka may be a bit too impatient for that, though."

Shrugging, the Yue copy said, "He has the power now. It's up to him to use it or not." Her face became more serious. "Unfortunately, there may be side effects."

"Side effects? I hate it when people tell me stuff like this. It's never good."

"You've already encountered one. Some of my physical attributes have transferred to Sokka. This may be…a trend."

"You mean he'll get white hair?"

She nodded. "Among other things, yes."

"Among other things?"

"I can't be sure how far things will progress, but the fact is that I'm the opposite sex of Sokka and not all the changes may be pleasant for him."

The monk gave the spirit girl a series of facial expressions: confusion, anger, confusion again, and then a look that made him look constipated.

Sighing, she elaborates, "I don't know if he'll gain female physical characteristics or not."

"What?" Aang exclaimed.

Yue began to fade somewhat and she took notice. "I'm sorry, Avatar Aang, but it appears that the sun is rising. I can no longer keep this spiritual form. I hope you can explain this to Sokka."

"Wait!" Aang cried out, but realized that he was looking at a dumb-struck Sokka. "Agh!"

Sokka yelped and jumped back. "What's wrong with you?"

A gentle hand touched Aang's shoulder. He looked up and saw Katara smiling down at him. She kneeled next to him and asked, "So, you were in the Spirit World, right? Why did you go there?"

Throwing his arms up, he explains, "Oh, you know! The usual. Something weird happened, I may need to fix it. Sokka is possessed by a part of Yue. May turn into a girl if we don't find a way to stop it."

Nodding, Sokka responded naturally, "Yeah, the routine—what was that last part?"

Rubbing the back of his neck and smiling, he said, "Well, apparently Yue and you had such a strong bond when she transformed into the moon spirit, that part of her stuck with you. I guess it's kind of similar to the contract the original moon spirit had with her.

"She said that she grows stronger each day. The good thing is that as she grows stronger, so do you. Your spirit and hers are mixed and are like one spirit now. She said that she's certain that you can waterbend now, if you were willing to learn how."

Sokka shook his head and patted the sword by his side. "I don't need bending."

Katara glared at him. "Don't be silly, Sokka! Think about the gift Yue has given you. You usually have to be born with bending, but you received it as a gift from the moon spirit herself! It would be a waste if you didn't learn to use it."

"Okay, I think we're getting a bit off track here." Turning to Aang, he said, "Did Yue say that she thinks I'm going to turn into a girl?"

"Well, she wasn't certain, but she's noticed that some of her physical attributes are appearing on you: her eyes, for instance."

Katara looked close and said, "I've been wondering about that for a while. You used to have such deep blue eyes and now they're almost icy blue."

Nodding, Aang added, "And she said that they may be just the beginning. Unfortunately, I don't think she knows why it's happening or how to stop it."

"Well, you said that she's becoming one with Sokka. Maybe it's not just in spirit, but in body. She can't stop it because it's just happening naturally. There may come a time where their identities will completely merge." Katara speculates.

Sokka grabs his head and screams out, "This can't be happening!"

Katara hugs him and says, "Well, at least you'll be with Yue for the rest of your life."

"Yeah, I wanted to be with Yue, but as separate people." He pulls his sister away and stands up. "I wanted to be chief one day! You think that'll happen if I'm a girl?"

Also standing up, Katara nodded and said, "Of course, Sokka!"

Scoffing, Sokka shakes his head. "There's never been a female chief in the history of our tribe."

"Exactly!" His sister retorts. "Thank about it: if there's anyone who could put an end to that archaic practice, it's you! You could be the first of many female chiefs."

Using some elegant airbending, Aang floats to his feet with enthusiasm. "I agree with Katara. Besides, we don't know you'll become a girl yet. Let's not get ahead of ourselves."