A/N: I have decided to write book four: Air. I owe no rights to Avatar: the Last Airbender, but I do keep thinking there should have been a book four for the show. Even since I wanted to see more Kataang action, even after they became a real couple. Anyways, this takes place sometime after the war is over, that one night when Aang and Katara became a couple. They are now in a relationship and that is becoming hard for Aang, since he doesn't know what to do, and that Sokka is always interfering, trying to protect his little sister. Honestly, he needs a hobby, and I'm sure Suki isn't good enough.

Chapter 1 - Relationships

On the night at the Jasmine Dragon, everyone is still complaining about Sokkas panting, all except for Aang and Katara, who are really out on the balcony in each others arms, watching the night sky. Aang looks at Katara. "Would you say we're now a couple?" Aang asks.

Katara looks at Aang and smiles. "Yeah." Aang and Katara leans in each others faces and starts giving each other a nose kiss. "So. Now that the war is over. What do you want to do?"

Aang places his hand on the back of Kataras head, gently stroking her hair. "I just want to spent the rest of my life with you."

Katara smiles then places a hand on Aangs cheek. "Me too."

Aang and Katara starts kissing each other on the lips. The rest of the gang watches Aang and Katara. Suki is really touched. Iroh. Zuko and Toph are smiling, Sokka looks upset and Mai is...well, Mai. Same old bored expression face. The whole gang quietly walks inside.

"I can't believe they're now in a relationship." Sokka says. "It's giving me oogies."

Suki punches Sokka on the shoulder. "Oh, Sokka. Quit being immature! I think it's nice they're together. Aang is nice and sweet, he's perfect for Katara."

"Yeah." Toph agrees. "I've been waiting for them to get together ever since I joined the group."

Sokka just rolls his eyes. "Whatever, I'm just looking after Katara. I mean, I know Aang's a nice guy, but I can't let my guard down cause they're in a relationship."

Everyone just walks away from Sokka, murmuring in argument and disagreement.

Later at night, everyone is sound asleep in bed. For Aang, he is rolling side to side, moaning a little. In his dream, he is back in the earth kingdom land where he had his battle with Ozai. The comet just arrived, then he hears Kataras screams. Aang turned to see Katara knocked down, all burnt and wounded, then he sees Ozai walking up to her. Aang tries to run towards Kataras side, to protect her, but it's too late. Ozai unleashes a ring of fire around Katara. Aang hears Kataras painful scream, until he no longer does.

The fire downs down and all that's left of Katara are her ashes. Aang kneels down in front of her ashes, holding some of it in his hands. Tears starts filling in his eyes, then the wind blows those ashes away. Aang turns to face Ozai, who is channeling lightning. But it's too late for Aang to do anything, Ozai shot lightning at Aang.

Aang instantly wakes up from his sleep. He's panting and sweating. Aang sees he was just having a nightmare. Aang just lays back down, tempting to return to sleep, but he can't. The nightmare is too scary, even since it was about Katara, his girlfriend.

Aang stands up, wraps the cover over his shoulders, then leaves his room. Aang walks down the hallway, towards Kataras room. Aang slightly opens her door, and takes a peek inside. Katara is in her bed, soundly asleep. Aang slowly opens the door, then tie-toes inside. He stands in front of Katara, watching her sleep. She looks so beautiful asleep, he would hate to interrupt it.

Aang slightly shakes Kataras shoulder. Katara moans, but doesn't wake up. Aang tries again, but a little harder. Katara moans then slightly opens her eyes, she sees Aang trying to wake her up. "Aang?" Katara says tiresome. "It's the middle of the night."

Katara starts sitting up on her bed. "I-I'm sorry, Katara." Aang says. "I just had a bad dream."

"Oh...You wanna talk about it?" Katara asks.

"It's just...I was about my battle with Ozai. You were involved and...he reduced you into ashes." Katara widens her eyes hearing that. "It was really scary. I guess I'm afraid Ozai will return and...come after you, even since you're now my girlfriend."

"It's all right, Aang." Katara whispers. "Ozai is finished. Zuko said he's gonna make sure Ozai is locked up tight."

"I know but...I'm still scared." Aang says. Katara doesn't say anything, not sure what to say. "C-can I...lay with you?"

Katara nods. "Sure." Katara moves aside, then Aang crawls into bed and under the sheets. Katara wraps her arms around Aangs body, and Aang lays his head on her shoulder. Aang starts to feel relaxed, in the arms of someone he loves. "Feeling better?"

"Yeah." Aang says. "I feel so safe with you, Katara." Katara smiles then blushes a little. She gives Aang a little squeeze. Aang wraps his arms around Kataras waist, giving her a little hug. "Good night, sweetie."

Katara gives Aang a kiss on the cheek. "Good night, sweetie." Aang and Katara peacefully falls back to sleep.

In the hallway, Sokka was walking down the hallway, then notices Katara's door is open. He takes a look inside, then he surprised to see Aang and Katara are a sleep together in the same bed. If he could, he would scream. But instead, he instantly backs up against the wall and covers his mouth, then makes a run for it.

In the morning, Sokka is all ready awake, pacing around in the living room. Katara and Aang are coming downstairs, holding hands, their heads touching and smiling. Sokka sees them then screams. His screams wakes them up from their love world. Aang starts to get instantly nervous.

"Nothing's happening!" Aang yells.

"Calm down, Aang. It's only Sokka." Katara says.

"I know but-" Aang gets cut off by Sokka.

"You two have to stop giving me oogies." Sokka says.

That frustrated Katara. "Oogies? You're such a moron, Sokka! What about you and Suki?"

"It's completely different. Like we didn't slept together on the same bed!" Sokka says.

"No it is...wait, you what gave you that idea?" Katara asks. Sokka was about to say something, then Katara gasps realizing something. "You were snooping in my room, weren't you?"

"I wasn't snooping. I was just walking down the hallway...when I paused for a moment and it...suddenly happen at your doorstep." Sokka says.

Katara pokes a finger in Sokkas chest. "So you were snooping! You're lying!"

Aang walks in between Sokka and Katara. "Can I talk?"

Sokka and Katara angrily looks at Aang. "Not now!" They both said.

Aang just backs up a little, then Katara and Sokka face each other again. "I can't believe you don't trust me! You are such a...ugh! I can't even come up a word that describes you!"

"It's not that, Katara. I do trust you. I'm just looking out for you. You are my little sister and I promised my dad I would protect you." Sokka says.

"Well you need to stop being over-protective!" Katara says. "Aang is a sweet, nice guy. and there's nothing wrong with being in a relationship with him. So leave us alone!"

"Hey, I'm not saying something's wrong with Aang." Sokka says.

Katara and Sokka just argues. Aang feels really weird about this then leaves the house. Aang stands out on the porch then sits on the stairs, looking down all depressed. He's in a relationship with Katara and it's really hard, cause of him, Katara and Sokka are arguing, even more then usual.

A few minutes later, Katara walks out to find Aang. She sits right next to him. "Are you all right?" Katara asks.

Aang looks to see Katara, giving him a concern look. "Yeah. I'm just a little upset."

Katara places a hand on Aangs lap. "What's the problem?"

Aang sighs a little. "Well. I'm just a little weird. We're in a relationship and...it's been upsetting lately."

"What do you mean?" Katara asks. "Haven't you ever been on a relationship with anyone?"

Aang shook his head. "Not really. You are actually my very first girlfriend. And...ever since we became a couple, I've been really nervous about losing you, even more then I thought...and now you and Sokka are fighting cause of me."

Katara puts a hand on Aangs shoulder. "It's okay, Aang. Relationships aren't easy. It's also normal to feel worried about someone you love. There are times when I'm still scared about you going out on a dangerous battle. But you have you learn that everything's all right."

Aang looks at Katara. "Yeah but...what about you and Sokka? You two are fighting."

"It's not really a fight. It was just an argument, and we argue a lot, remember?" Katara says. "Besides, Sokka is just being immature. He needs to learn that there's nothing wrong with being in a relationship with you. It's almost like he thinks it'll end up badly, like when I found out the truth about Jet."

"Yeah...I guess you're right, Katara." Aang says. Katara and Aang hugs each other. After a while, they disband the hug. "You wanna go for a walk?"

Katara nods. "I would love that." Aang and Katara leaves the house and goes for a walk.

In the house, Suki and Sokka are alone at the house. Sokka is just sitting on the cough while Suki is doing some chores around the house. "I just still can't believe they're in a relationship." Sokka says.

"Oh, stop it Sokka." Suki says. "I think they're perfect for each other. You need to leave them alone."

"I know, but I'm just looking out for Katara." Sokka says.

"Looking out for her from what? Aang?" Suki asks. "What's so dangerous about Aang that you have to look out Katara for?"

"Well he..." Sokka pauses, he doesn't really know what to say. "Err...he could..." Sokka couldn't think of anything. Just as he gives up, he realizes one thing. "He's the avatar, some bad guys might try to kidnap her and...use her to get to him."

Suki gives Sokka...the stare. "Oh, and that's the reason you have to interfere on their relationship?" Suki just slaps Sokka on the back of the head. "You need to stop! Aang is a sweet guy, and besides. Katara can take care of herself. She is a waterbending master."

"I know, I know she is but...I just...I can't...I." Sokka doesn't know what to say next, so he sighs in defeat. "I just don't know what to say."

Suki sits next to Sokka then gives him a hug.

On the walk, Aang and Katara walks by the park on the outer areas of Ba Sing Se. They are holding hands, smiling Katara takes a look around in the park. "It's really beautiful." Katara mentions.

"Yeah, I guess it is." Aang says. Aang looks at Katara. "But not as beautiful as you."

Katara blushes a little. "Aww, you're so sweet."

Aang and Katara walks for a while, then they return to the inner wall of the city. Just as they walk, they walk into some poster. Aang takes a look at it. "Hey, Katara. Look."

Katara goes to the poster and reads it.

"Citizens of Ba Sing Se. The earth king is proud to announce the celebration of the fire lords defeat. In the middle of fall, there's going to be a ball at the earth kingdom palace. With a special guest: The Avatar and the new fire lord, fire lord Zuko."

Katara looks at Aang. "Wow. It must be nice to be the avatar, huh?"

Aang looks at the fine print. "There's more...'If you are writing this avatar, you are allowed to bring some friends in your 'team avatar'' I guess you feel special to be my girlfriend."

Katara just laughs a little. "I feel special to be your girlfriend, no matter what." Katara says, wrapping her arms around Aangs neck, then giving him a kiss on the lips.

Aang just blushes from that kiss and laughs a little. Anag and Katara takes that one poster and rolls it up. Aang and Katara returns to their home. On the front door, Aang and Katara faces each other, holding each others hands.

"That was a lovely walk, Aang. I had a wonderful time." Katara says.

Aang smiles. "I'm glad that you did."

Aang and Katara walks into the house. They walk inside to see everyone's here, except for Zuko who is now living in the fire nation palace to restore peace to the fire nation. "I'm glad you're all here." Katara says. Katara takes out the poster then unrolls it. "There's a ball happening in the earth kingdom palace."

Sokka grabs the poster and looks at it. "Really? Maybe we should go." Sokka looks at Suki. "How about you?"

Suki smiles. "Yeah, sounds like fun." Everyone looks at Toph. "What about you, Toph?"

Toph just leans back, resting her head on her arms. "No way. I don't have a boyfriend!"

"Oh come on, Toph." Katara says. "It'll be fun."

Toph just sighs in defeat. "All right, all right! ...When is the ball anyways?"

Katara reads the poster again. "It just says sometime in the middle of fall. I guess we'll find out soon enough."

Later at night, the gang rests. Katara escorts Aang to his room. Aang crawls into bed. Katara lays the cover over his body. Katara moves to Aangs face, smiles, then gently strokes his cheek. "You going to be all right?" Katara asks.

Aang nods. "Yeah, I think I'll be okay."

"Okay." Katara says. "Don't hesitate to come to me if you had another nightmare or if you're scared."

Aang nods. "All right...I love you, Katara."

"I love you too." Katara whispers. "Good night."

Katara gives Aang a sweet kiss on the cheek. "Good night." Aang whispers.

Aang quickly falls asleep. Katara leaves the room then slowly closes the door. Aang sleeps peacefully, knowing that being in a relationship with Katara isn't going to be so bad. That everything is going to turn out all right.