Demonically Different (Katara x Wei Wuxian! Male! Reader)

Wei Yang [Name], he is a rouge bender who can control not only fire, but something that others, other than spirits, don't know exist. That he exists.
After Aang disappeared into thin air, he was killed by Azulon, the fire prince himself. Or so... they thought.
What actually happened was that he was saved after Azulon left him, and it was non-other than Aang who came to his call. But when they were far away, now in the Air Nation waters, the storm got worse, engulfing them both. They ended up frozen in the iceberg for who knows how long. Soon, what seemed like a few minutes or so, [Name] opened his eyes and was met with a worried looking water tribe girl and a boy behind her shooting daggers at him for no reason. Oh if only he knew why.
Over the time of the journey to help Aang learn all elements, Wei Wuxian [Name], Courtesy Name: Yang, had fallen for the water-tribed girl.