This all takes place around the end of the second season I want to say. It's the part where they are in the cave right after Zuko and Katara have their little chat and he on the fence on how he feels and such. Anyway this is a love story between Zuko and Katara so have fun I hope you enjoy it.
"How could you betray us?" the girl screamed. "I trusted you!" Soldiers grab the water bender and slam her to the ground; they ignored the pleas to let the avatar go. "He can save us. I truly believe it, please let him go!" She raised her hands and began to blood bend only to have a knife cut the tendon in her wrist.
"Bind this one up, she is a feisty river and will be a wonderful treat for father." Azula turned to her brother. "Or would you much rather have your way with her? Cut the other tendon. Let's not have our bodies turned against us if she were to escape. Take the blind one to the soldiers they will have fun with her remember to treat her like the water bender; she can probably bend metal so shackles will be useless. And the stupid one,"
"Let my friends go." Sokka's head sunk. "Especially let my sister go." Tears streamed down his cheeks. "Do what you will with me but please, she doesn't des" Azula struck him in the throat."
"Uh blah blah blah. Take him to one of the work camps he seems able and at least somewhat competent." She finally stood before the avatar. "Ha I should have all the glory and claim your head as my own present to father but I think I will let my brother take the honors for once." Smiling she kicked Aang to Zuko. "Take him to father. We are family after all and when the world is ours Zuko, I want all of us together watching it burn." She turned to the head soldier. "Let's leave this glowing crystal cave and go back home to celebrate the victory that has been a long time coming."
Fire Nation Palace
Katara struggled and fought as they brought her and Aang into the grand hall. Azula and Zuko followed close behind.
"Well, this is a surprise my child." Fire Lord Ozai ignored Zuko. "The avatar and a pretty water bender, I am pleased you have done well Azula."
"Actually father I didn't capture the avatar. Zuko did and instead of letting this girl's beauty go to waste in the soldier's hut, I thought you might like her as another lake to dry up."
"Thank you for considering me my dear fire." He got up from the blazing throne approaching Zuko. "Look at me son. You have been pardoned from your insult to the fire nation and its ruler. As a token of my generosity I will give you this water bender. You were betrothed before your exile, so take the whore and become a man before becoming a husband." The fire lord chuckled causing the flames to burn more brightly as he returned to his throne. "Welcome back, my son."
Zuko bowed to his father and left the grand hall. Guilt ravaged like a forest fire in his mind, the thought of being accepted back into his family was thrilling it was the reason why he hunted the avatar in the first place. But the look in her eyes when the soldiers dragged her away from Aang was an image he could not erase so easily. He stood before his room. "I never thought I would see this place again." He turned to the servant beside him. "Go prepare a bath for me." The woman nodded and scurried off as her master entered the room.
Katara was pulled into a room with two maids on each side of a large what looked to be a natural spring perfectly shaped to be a bathing tub. The room had a mirror and a wide variety of red dresses. The elderly maid reached out to Katara kindly taking her from the guards. "Leave us. You know the law no man but the owner of this whore is allowed to see her flesh." The two men nodded leaving the women while they began to remove the torn clothing.
"Ugh! I won't let him touch me!" She pulled her face away from the warm washcloth. "I will especially not get dolled up for him too. If he is going to have me as his slave I would much rather be in my tattered rags then in some skimpy red dress and make up!" The servant grabbed Katara's face dunking her head under the fragrant water when she surfaced another dumped more soap onto her head and began scrubbing.
"You know for a water bender I would imagine that this bath would be a blessing." The maid looked at her. "Whore you should be grateful, the fire lord could have chosen you for himself. From what I have heard he doesn't keep his women for long, when he tires of them it is said he either lights them on fire or throws them into the volcano." She pulled the angry youth up beginning to wash her body with the help of the other maid. "It would be best not to use bending at all. They have temporally stopped you from bending but if you do it and someone sees you they will burn your arms to ash. Prince Zuko has never taken a concubine so if you are lucky you may spend your whole life here. A man never forgets his first and even if you are worn and gray, he will put you in a comfortable place. I always remember my first for I was his as well. It took some time but I flowed with the waves and now instead a thrashing river I am in a calm stream living out the rest of my days in ease. They never forget you, be content."
Katara glared at the elderly maid. "Like you? A broken woman who now bathes helpless prisoners knowing that they will be used like this? You call this comfortable?" The blue eyed maid turned away grabbing a towel motioning the other side to her partner.
"Yes like me." She started to dry off the girl. "I call this better treatment than being in a work camp or even worse a soldier whore. They are usually killed in both places and even if they are not who would want to live a life like that? It is best for you to accept your new life or you may get your wish and be removed from the haven you were rewarded."
Zuko stared out over the balcony he heard the door to his room open. "No need to worry I have no wish to violate you." He stood contemplating what he would say next. "I don't know how to begin Katara." He turned to find Azula. "Oh sorry I thought you were."
"Your whore from father?" she lifted her eyebrow walking closer to him she leaned against the stone railing sighing before speaking. "I am curious as to why you are not more enthusiastic about the second chance with father. This is a once in a lifetime opportunity and you bow without saying a word. Did something happen between you and the raggedy tribal girl?"
"No, it's not that I am just questioning how I feel about betraying uncle. I know it was the right chose but I can't seem to shake the guilt."
"Oh please Zuky, uncle was a hippie tea junky, worthless. I wish he could have been here but he chose to betray the family and that is just not tolerated." She shrugged wandering back into the room. "Have fun with your new pet. If you don't claim her father might be insulted and back to exile with you." She laughed before opening the door to leave. "Well, look at you whore, I can see your breasts through that red dress. Very hot I barely recognized you. Try to cry plenty tonight when my brother takes you out to play."
Katara stood in the room she admired all the different armors and weapons on the walls she saw Zuko in the doorway of his balcony. "Filthy pig, humph!" She turned away from him. Gentle footsteps moved toward her she could feel a storm of disgust well inside of her; she raised her arm to strike only to have her arm twisted behind her.
"I don't know if you have realized but you are mine now," He hissed in her ear. "I can do with you as I wish for as long as I wish. So hold your tongue and your floppy fists." He threw her on the bed. Katara closed her eyes expecting to fulfill her duties when nothing happened she opened her eyes to see her captor's back as he walked away. "You are mine and my wish is to not rape you to prove myself a man. Good night." He closed the doors behind him to the balcony. Katara lay on the bed for some time she gazed at her sore bandaged wrists contemplating what her next move should be. The elderly maid's words repeated in her mind and she knew that bending would be the wrong move but she still wanted to soak the king and his heirs until their flames extinguished.