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Which one do you like more?
>Lillie returns a year later
>Chicken-chan was waiting to welcome her
>Lillie hugs Chicken-chan and is super happy
>She shows her Pokemon to Chicken-chan and meets Nebby again
>Visits her mother and Gladion
>Spends the night at Chicken-chan's home, chatting all night and catching up
Or
>Lillie returns a year later
>Sun welcomes her back to the region
>A blushing Lillie hugs an unsuspecting Sun, he gets flustered about it
>She shows off her Pokemon and meets Nebby again
>They visit Lusamine
>They meet Gladion, who, as the shipper he is, tells protagonist to let Lillie sleep in his house, since she doesn't have anywhere else to go
>Lillie stays with the protagonist and Sun's mother teases him about it, making the situation awkward for both
>They play all night, Lillie tells him about her adventure and they have a little battle
>They go an adventure together with Nebby, who is happy to have both his mom and dad back
I know the second one is more details. That's because it was more cute. And I know Sun doesn't show emotions. Just roll with it.