Cor Cordium

O heart of hearts, the chalice of love's fire,
Hid round with flowers and all the bounty of bloom;
[...]

It is not the end of his story, only the beginning, but everyone is too occupied with mourning to notice.

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Riku misses Sora. He misses Sora so much, it physically hurts him. He misses his easy smiles, the jokes. The reassurance that no matter what mistakes Riku has done, it's fine. He is a good person, deserved of being a Keyblade Master. He misses how Sora was capable of turning every pain and sadness into something bright. Sora was given the rare gift to make gold out of every pain. A purer blessing doesn't exist.