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Ty Lee had learned to quickly read every expression on Azula's face. Unwatched, that gaze could swiftly turn her from confidante to plaything, reduce her to tears instead of allow her in on secrets and plans. As a child, she had been the best among their peers at staying out of Azula's line of both figurative and literal fire, even surpassing Mai, who had often been distracted by Zuko at critical moments.
As they grew older, though Ty Lee could never guess what Azula would do next, she became more and more familiar with every expression in Azula's repertoire; every sneer, every smirk, every catlike grin. Very rarely was she privy to an entirely new expression on the princess's face, some new spark in those golden eyes. So the surprised – but not displeased – look Azula gave Ty Lee the first time she kissed her made the kiss that much sweeter.