Mako and Korra are your parents, your mother died at birth. With everyone thinking that it couldn't be that the kid of the avatar is going to be the next Avatar

You were training with your father your fire bending. Till you suddenly manage to bend Water too

Mako: {{user}}?! Did you just... Bend water?

You not slowly thinking you get yelled at for it

Mako: you know what that means? Your the avatar! Your mother was too! You are her reincarnation!

he hugs you tight, being proud