This is set about 5 years after Aang finished the Hundred-Year War.
Katara's eyes snapped open. It was a full-moon night, and she always had nightmares then. Groaning softly, she rolled over and tried to fall asleep, but sleep eluded her. Sighing frustratedly, she sat up, and glanced out the window. The sea of cloud below the Air Temple swirled and swished, much like Aang's airbending. The thought of that lit a small smile on her face. Tomorrow, Aang was going to take her to a sacred place for the monks, where they induct the new monks in, and Katara was going to be inducted as an honorary part of the Air Temple. Of course, only Aang was going to be there, but that made it all the more special. Her eyes lingered on a piece of cloud that swirled in the most peculiar way. It swirled in, then in a circular motion and up. She could have sworn she saw someone flying. Shaking her head, Katara lay back down onto the bed, and once again tried to fall asleep.
Aang silently glided through the cold night air, and he decided to try a little fancy flying. He flew down, through the cloud sea, and as he reached the bottom of it, started to fly in a whirlpool shape, then he pulled up and landed. He flopped down on the grass and sighed. Looking up at the night sky, he thought about the ceremony he was going to perform the next day. The monks always made everyone attend the induction of a new monk, and he had seen the ritual done many times, but he still wasn't sure if he could do it. The ritual needed 5 monks, and yet there was only himself, but he was determined to see it through. After all, he had improved his airbending since he emerged from the iceberg….and he was much stronger physically wise. He grimaced. Katara WILL become a part of the Air Temple. Still, he doubted himself. But his mind soon wandered away from the problem, as it always had done. He stared up at the moon, so full and white this night, as if Yue decided that tonight, she would show the world her most beautiful moment. If Sokka saw Yue's most beautiful moment….chuckling lightly, Aang got up, and made his way back to bed.
It was already late in the morning when both Katara and Aang was ready for the induction ceremony. A tense silence had filled breakfast, with Katara trying to break it with a large smile and by saying how much she looked forward to the ceremony, which only served to make Aang even more queasy. After they finished breakfast, Aang took Katara to the Air Temple Sanctuary.
Katara frowned. 'What are we doing here? This is just where the Avatars are isn't it?'
Aang laughed quietly. 'It's a surprise.' He quickly opened the chamber, and taking Katara by the hand, he led her in. He walked to the left of the door, and the light started to dim. Katara squeezed Aang's hand slightly, glad for the comfort of his warmth and his presence. Aang smiled into the darkness, and he lit a light, knowing Katara would feel more at ease with it. As he reached the left wall of the room, he let go of Katara's hand and snuffed the fire. He could hear Katara gasp behind him, and he assured her.
'It'll be fine. I promise.' He took a deep breath and released a massive blast of air at the wall. Silence fell, and for a moment it seemed like nothing happened. Then, a quiet click then the sound of something creaking filled the room.
'Aang…Aang…AANG. WHAT'S GOING ON?' Panicking, Katara struggled to let herself be heard above the noise. Aang groped in the dark for her hand, and when he found it, squeezed it affectionately. Katara was still nervous, but she calmed down a bit, although she was still breathing fast and heavily. Slowly a slit of light appeared, widening until a hole about the width of a badger mole was formed. As their eyes adjusted, Katara let out a delighted gasp. In front of her was an underground garden, with cliffs rising up, higher and higher around the couple. The sky was visible on top, but only barely. Foliage dappled the sunlight, making it hit the garden at such an extraordinary angle, so that everything seemed golden. A path led from the hole to a small, calm pond, and beyond the pond was a circle of stone, partially covered with green moss. Along the sides were 5 holes, like the points of a pentagon. Katara could only stare in wonder, and Aang had made his way behind her. Snaking his hands around her waist, he nuzzled her neck.
'Do you like it?' he asked softly. Katara gave a small sound of agreement, and Aang could feel her ecstasy. He kissed her neck softly and let go. He walked in front of her and with a smile that would melt the hardest of hearts, turned around.
'So. Are you ready Katara?'