Just imagine it, Naga goes into heat, so Korra has to take her out to the tundra to be spayed by a hermit family of breeders.
His home is the Fire Nation ship we saw in Aang's time, now well over a century and a half old. They lead Naga to the stables and take Korra for a tour.
In the shipbaord surgery, he has a collection of jars, potions, treatments, one of which he nonchalantly drops to the ground in Korra's presence. Pheremones.
Two of his sprier, younger males have been prowling the halls and race to the scent that so stirs their blood. They find Korra, a viable healthy female, poised aggressively.
They bare their teeth and attack, and Korra, an animal lover since birth, hesitates. She is knocked the floor, sickening excitement rising in her. It as though she is in a rushed embrace with her best friend, but in all the wrong ways.
Korra is pushed face first into the foul-smelling liquid while the second male rips her furs from her taught, strong backside. She splays a leg, firebending, but this room was built to hold Fire Nation soldiers in agony. It can take what she can give, can she say the same for what's about to happen?
The first polar bear dog takes the back of her throat in a soft yet unyielding grip of panting breath and dripping slobber while his brother scratches hastily at Korra's perfectly-toned thighs, trying to find purchase in her form. She can feel what's coming as it beats expectantly against her groin, thrusts jerkily against the cleft of her ass...
Eventually, inevitably, the young pup drives it home. His half-hard cock already too large for the young girl to take be comfortably. Instinct kicks in and she bends the fluids of her own body to lubricate the assault, flooding herself with the endorphins of arousal. Horrified, she begins to enjoy what's happening to her.
It doesn't take long for the two animals to become three, writhing on the iron floor amid their own juices.