A long time ago, I read the story about an alternate ending to friendship is magic part 2. Where Celestia ask Luna will she accept her friendship. But Luna said no. I can't remember the rest, but I do know that she also said that she need time to think.

It's a one-shot.

Do anybody know the story like that?

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I think I remember that one, but not the name. You might want to try searching around the Sad Luna group.

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It wasn't there, but I eventually found it. Thanks.