There is only the passage of time.
Starry skies, hollow eyes, glass castles- so very, very breakable.
Cloud is…
Lost. He was looking for his light, but he happened to stumble upon a glass slipper- just had to return it- and in so doing, stumbled upon this fragile angel, shattered eyes and broken smiles, too sad to be Cinderella.
Kairi is…
Trapped. She had locked herself in this glass castle with its steep walls and sharp fences, both in plain sight and completely out of reach. And even if she wanted to let down the drawbridge for the handsome knight, she discovered that she couldn't, for she had forgotten to make herself a door.
He wasn't really the type for holding or kissing, anyway. They never specifically said, "I love you"; they never called their outings "dates". They were just together, and they were sort of happy.
So the shattered soldier started getting pieced back together, and the ice princess began to melt.
And if she sometimes cried when they were sitting on the beach together, if he sometimes woke screaming another girl's name, well, no one had to know. They could just hold each other until everything was all right again.
"Cloud," she said, "if you go away, will you look at the moon and think of me sometimes?"
"I'm not going away," he replied in his usual, closed-off way of speaking, but he was secretly troubled by this question. "I'm not going," he repeated, "but if I was, then yes, I would. Promise."
Wine-red hair curtained violet-blue eyes. "Promise…" she mumbled.
They talked no more of promises.
And when the day came that her crystalline walls came crashing down, as he saw his Kairi in the arms of another, he remembered.
He saw her dancing like a nymph on the sand, saw her caught in a dream, ruby locks falling gently on her shoulders and on the pillow, his hands tangled in her hands and in her hair, Kairi laughing, Kairi crying, Kairi with ice cream on her nose, just Kairi.
He looked up at the moon and thought of her.