This takes place right after kh2 ends, and Kairi and Sora are both 15, Riku is 16. They are back on the island.
Kairi awoke one morning. She was now 15, and she was as tired as ever. Her red hair has gotten longer, and she swerved it in the wind. She realized she was sleeping on the beach again. Sora ran across the beach to her.
"Hey Kairi!"
"Oh, hey Sora."
Sora tripped and fell on top of her. When he moved off of her, they blushed really hard. He stood over her, on his knees, and he bent down to kiss her. They were officially going out, and Sora knew he wouldn't have to deal with heartless ever again. As he kissed her (he was still on his knees on top of her) Riku came by.
"Uh…Sora…what are you doing?"
Sora glanced up from kissing Kairi. He stopped kissing her, and the two of them were beet red. Riku looked angry. Sora remembered how he loved pissing off Riku, so he was going to be rude.
"Just doing a little somethin' here with Kairi…" Sora answered.
"Yeah, if you hadn't come, it would have gotten serious!" Kairi said. She laughed.
Riku was now really pissed. He turned away in a huff. Sora and Kairi smiled. They continued their kissing.
Meanwhile
In what seemed to be a castle, a girl lay dead. A man was carrying her bloody body. His long silver hair flowed over his shoulders. The girl was covered in blood and bruises. Her clothes were torn apart. So were the man's. As he carried her down the hallway, his boots got blood on them. Blood off of the ground. He carried her to the Cathedral. There, he fell to the ground.
The girl toppled across the floor. Her long black hair covered her face. She lay lifeless on the ground.
The man whispered, "Ne me mori facias."
He lay on the cold ground. His long silver hair covered his face. As he lay nearly dead, a rip finally came in the back of his shirt. Out came one wing.