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They've changed, Kairi realizes when she looks at Sora and Riku. They've grown up, or just about, and she's grown up too, becoming someone she's not sure her younger self would have expected her to be.
There's still that familiarity, though, the fact that their hearts are intertwined, that they've fought through thick and thin to become the people they are now. They've worked so hard to reach this point, lost and found their homes and hearts and each other so many times.
And maybe that's the real magic of the paopu fruit, to be able to look at each other and say I know you, I love you as you used to be and as you are now.