Forgot In Cruel Happiness

In an age when every known Southern waterbender has been taken prisoner by the Fire Nation, a storm at sea forces the crown prince to rely on a waterbender who isn't from the north or the south. Iroh learns to freedive, which will be useful to his nephew in 40 years, and fails entirely to learn other things that would have been useful at the time. (Iroh/Foggy Swamp OC)