A/N: I've always been intrigued by how Seth and Leah are brother and sister and yet are the complete antithesis of each other. So I wrote this to reflect that.

Disclaimer: I don't own Twilight.

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In life, things often come in complementary pairs – two items on either end of a spectrum, which somehow through their contrast, offer each other completion. Fire and ice. Day and night. Life and death. Man and woman. Seth and Leah.

People who knew the Clearwater siblings often wondered to themselves how a brother and sister could be so different. How they could share the same genes, the same heritage, the same upbringing and yet…..be such opposites.

Seth: happy, always smiling, friendly, open-faced, non-judgemental, easygoing. A warm, loveable boy. A help around the house. Friends with everyone.

Leah: bitter, cynical, sharp-tongued, angry. Closed-off, aloof, cold. Friends with no one. Rebellious. Can kill a conversation just by walking in a room.

There were rumours of course, whispers. That Sam Uley boy (bless him, he was so good for the rez) used to go out with her didn't he? They were quite the couple a few years ago. But he had dumped her after he had disappeared for a while. Now he was married to Leah's lovely cousin Emily. No one blamed him of course. Emily was sweet and kind and gentle and always opened her home to others. Who wouldn't choose her over her bitter cousin?

Most people forgot. They saw Leah as she was now and convinced themselves that she had always been like that. But Leah remembered. And Seth remembered. Once upon a time, Leah had been happy and easygoing too. Once upon a time, she had been like Seth. In that time, nothing more than a distant memory now, the Clearwater siblings had been on the same end of the spectrum.

But life needs balance, and so the scales were tipped and Leah was flung unceremoniously to the other end to become her brother's opposite. And now they stood, side by side against the world, a complementary pair. But Leah never forgot that once she had been his equal in every sense of the word.

A/N: Please review!