Sakura and Tomoyo
Sakura and Tomoyo are the best of friends and cousins. Sakura trusts Tomoyo enough for her to be the only one of Sakura's school friends to know about her cardcaptoring adventures. Tomoyo loves Sakura enough for her to never break that trust, and to aid Sakura by video taping all of the adventures.
Tomoyo loves Sakura, much like how her own mother, Sonomi, loved Sakura's mother, Nadeshiko. Though she loves Sakura unconditionally, Tomoyo doesn't force her love onto her. Instead it's more subtle, you can tell she loves Sakura through her actions and expressions. In order to aid Sakura, Tomoyo has decided that she wanted to make all of her costumes for each and every battle. Tomoyo doesn't miss a beat when feelings between Sakura and Syaoran begin to grow, and she sets aside her feelings for Sakura and help the two get together. If Sakura is happy, she's content.
Sakura may or may not know about Tomoyo's feelings, but Sakura does appreciate her friend helping her. If Tomoyo needed help, Sakura would help. She gets embarrassed about being constantly video taped, but she puts up with it just because it makes Tomoyo happy.
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It's never mentioned that the two are cousins, for whatever reason.
