I think a lot of it was the failed male-female relationships on that show were always underlined by how well those two worked. Just seemed natural to me that they went there with it (called it in Season 1), I'm surprised they got to.
It's an obvious pairing if you forget for a second that it's not the standard. They make way more sense as a couple than Korra/Bolin did, or how Korra/Mako played out.
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