The next morning Katara rolled over in her usual routine to clasp at the cooler pillow to bury her face in, but instead she hit a face very hard with her elbow.
"OWWW!" There was a shout and a flury of sheets as a dull thud sounded on the floor beside her bed. Katara crawled over to the edge and peered down at a naked Zuko who rubbed his red nose. She giggled as her hair fell down over her shoulders to tickle Zuko's nose. He sneezed.
"Are we going to make this a usual thing? Cause if so, I'll remember to tie your hands to the bed post." He grumbled and climbed up to stand before Katara. She squealed in delight even though her head throbbed from the night before, but she wouldn't let that get in the way of her and Zuko time.
"I'm glad you finally decided to stay until morning." Katara replied and wrapped the cool blue sheet around her naked form. Zuko smiled and kissed her nose sweetly.
"After all, you are the girl I'm gonna marry. I've got to practice." He said and then dove ontop of Katara and kissed her lovingly. They didn't hear Teng Su's usual quick knock before she entered.
"Ahhh!" She screamed and Zuko dropped again to the floor beside the bed as Katara shoved him off and pushed a sheet to the floor. She looked up to smile devishly at the servant who now was bright red and inching towards the door which was open ajar.
"I will come back... at a more apropriate time, Master Katara." She bowed and Zuko stood with the sheet securley wrapped around his waist and his hair sticking up in soft tufts.
"Fire Lord." Teng Su curtsied to Zuko and tried to suppress her giggle before taking her leave and shutting the door behind her. Zuko laughed loudly and fell onto the bed in a heap of chuckles.
"That was quite embarrassing. She comes this early in the morning? I'll have to tell her to come later." Zuko said and stroked Katara's bare arm, raising goosebumps upon her skin.
"She means well. I don't mind." Katara said and tackled Zuko so that she lay ontop of his warm chest. He smiled kindly and pushed a piece of hair out of her eyes before kissing her softly.
"So what are you doing today?" He asked as he ran a finger along her jawline absently.
"I have to go back down to the bridge and get that book if it's still there. Aang will want to see it and-" Zuko put his hand over her mouth which muffled her explanation and made her eyes narrow.
"You can go, only if I come along. I don't need you getting hurt again." He said generously and Katara could do nothing, but take it. She stood up from the bed in a hurry as Zuko lay and watched her dress. She laughed and threw his pants at him as she cinched her black belt at the waist of her blue dress.
"Better get dressed, Your Majesty. We're gonna be late for breakfast." She said and pounced onto him, laughing.

After another hour trying to get dressed then getting breakfast, Katara was walking briskly down the path to the palace gates with Zuko struggling to keep up with her pace. She was on a mission. A mission that could possibly tell her what was controling her. Zuko jogged up to her side and grabbed her hand.
"Slow down, it's not going anywhere." He crooned and stroked her hand. Katara sent him a small smile then turned her attention back to the gates that were now opening for them. Zuko sent the guards a wave and then hurridley followed Katara. She was a few feet from the brush when she sprinted to it. Her hands were jagged and poked as she dug through the thorns to retrieve the book. She almost thought that they had gotten it after all, but just about when she was gonna give up, her fingers met soft leather. Katara pulled it out gently and inspected the cover for any damages. None. Katara thanked the gods and leafed through the whole pages, looking for any that had been torn or ripped out. None. She smiled and patted the cover gently as Zuko met her gaze.
"Is that it?"
"Yes. Not a scratch. Now I just need to give this to Aang so I can see what he thinks." She replied and turned towards the palace.
"Or we could go to a tea shop and have some tea. We haven't done that in forever." Zuko said as he reached for her hand.
"I would Zuko, but I really need to get this to Aang. Why don't you go visit your Uncle. He seems quite lonely." Katara said and gave him a quick kiss on his lips before sprinting back up the path to the palace.

"Aang! I've got something for you!" Katara shouted as she ran through the library to the table the airbender had been sitting at for the past week. Books towered over him as he read with bleary eyes. They were bloodshot from lack of sleep and he had dark shadows under his eyes. His eyes brightened slightly at the sight of her and he stood to take the book from her hands. Instantly he became animated, flipping through the pages hurridley as if looking for something. Atlast he looked up to meet Katara's eyes.
"Where did you get this?"
"A bookshop in the city. Is it significant?" She asked anxiously.
"This is the key to all spell existance! I remember this book from when the monks taught me about spell work. I never had a knack for it and haven't used a spell in 100 years." Aang replied and a puzzled look crossed over his face.
"What's wrong?" She asked impatiently.
"I just remember that there was more. It's missing a couple more pages." He said and then turned to another book and leafed through the pages.
"Ah, here it is. There are three spells missing. It says here that there should be the spell for immortality, a spell for hosting spirits in living life forms, and one for frying muskrats." He replied. Katara gasped as she remembered Iroh's theory back at the tea shop.
"Aang! That's it!" She shrieked.
"Frying muskrat?" Aang asked questionably.
"No! Someone planted a spirit in my body. That means some one is using me to get to something else."