Ozai has conquered the Northern water tribe with that he took a personal hostage princess Yue.
Basically his concubine.
They completely demolish the Northern water tribe. At this time the southern tribe consist of thousands of people and hunderds of villages the numbers begin. Once they hear about the slaughter that takes place in the north they realize for the sake of there people they must negotiate with the fire nation for a peaceful solution.
Fire nation terms are an army that will be at the fire nations disposal, the fire nation will set up and run the government, the previous chieftain will put under house arrest and surveillance for the reminder of his life, no native will be to allowed leave the southern water tribe unless a permission is granted by the new fire nation government, water benders will not be allowed to bend only in special fire nation academy's abroad and lastly any living heir or heirs to the chieftain must be handed over to the fire nation.
The fire nation will in return allow the southern water tribe to continue and start trade with new or former nations, they will not seek retribution for the live lost, their chieftain will be allowed to live, they will be under that protection of the fire nation, and an arranged marriage shall be put it place so the bond may become permanent
Sokka and Yue were in engaged when the fire nation attacked and Ozia took her.
Katara has become a master water bender and took an oath to avenge her mother. She is the only remaining water bender left.
The two will be taken to live among the fire nation court they are the spoils of war, for Katara her worst fear is to become another whore of the fire nation.
Sokka is dreads to see what is left of his former lover.
Zuko is very infatuated with Mia. He bears the scar and at this point does what ever he is told even when his birth right was passed over to his sister, he was happy with not being banished an decided not even to question it. He is a ghost in the palace he lives in the shadows hardly ever being acknowledged. Only when hes I going to be cirtizied people remember his name.
His uncle is under house arrest given his own private quarters with a peaceful garden of his own but is never allowed to leave his golden cage. Except for the acausal visit from Prince zuko
Azula is a fire Lord in training with her two companions she is a force to reckon with.
However, will any man ever be good enough for marriage?