Azula’s and Katara’s girls night (and how it ruins Sokka’s beauty sleep) (фемслэш)

For some insane reason Princess Azula has betrayed her father and joined the Gaang.
Sokka cannot for the life of him understand why.(Everyone else can.)
But then his rest is disturbed by suspicious sounds from his sister’s tent and Sokka, ever the protective older brother, even takes the risk of bursting into his sister’s sexy time, only to find the two girls having an innocent girls night.
So what is the truth? Sokka sure as hell doesn’t know anymore come the end of the night. And honestly, maybe he doesn’t even want to know.