Time to learn.

The next morning, Aang and Katara got up early so they would be in time for their lessons with Master Pakku. When the older man noticed the curvaceous figure of Katara approaching, he grunted as his eyes ran over her. "You didn't tell me your friend was a girl." He spoke up sternly, almost in a scolding tone.

"Is that a problem?" Katara gave back, not even giving the Avatar a chance to answer. It seemed like Master Pakku wasn't pleased with her presence.

"Here in the Northern Water Tribe, our women learn to use their waterbending for healing. Not for fighting." His voice stayed calm but it was clear that he wasn't looking to discuss this. He wasn't planning on teaching Katara, and made a gesture in the opposite direction - telling her to leave him alone with the Avatar, who he'd more than happy turn into a master waterbender just like himself. But Aang didn't want to know anything about this either as he stormed away, telling Pakku that he didn't need his lessons if he wasn't going to help out both of them.

Of course, Katara couldn't let this happen...

With vigor, she rushed over towards Pakku. He wasn't sure what to expect as he watched that curvaceous wannabe waterbender storm over towards him, proving even more that she wasn't worthy of his training since she was clearly planning on attacking him. He didn't flinch until she dropped down to her knees and tugged down his pants with quite a lot of force, letting his dick flop up immediately. He wasn't too big, actually. Good, Katara thought to herself. She'd show this stupid man what she was made of!

As she took Master Pakku's hardening cock into her eager warm mouth, her plump lips smacked against his groin within seconds. After sucking off hung guys like Sokka and Aang for months by then, she could handle a couple of inches with ease.

"It's going to take more than being a slut to convince me, girl." Pakku groaned out, although his cock was already twitching and he was definitely enjoying the treatment. His wife hadn't been giving him a lot of attention lately, so getting his cock assaulted by such wet, experienced mouth was definitely welcome. He was convinced that he couldn't be convinced by this, however, but Katara wasn't planning on just sucking him off.

She was going to show him something he had never seen before...

Katara didn't even need to use her hands. She just swallowed his entire cock over and over again, rapidly bobbing her head onto his not-so-impressive shaft. Drool was running down as she did get really good at that over time, knowing exactly what would set off men like Aang and Sokka who were hung studs with great stamina. She wasn't very impressed by Pakku so far. Not by his attitude, not by his cock, and definitely not by the way his cock was throbbing in pleasure within seconds. The brown-skinned beauty could tell that he was already approaching his orgasm rapidly, and gave his balls a firm squeeze to finish him off. She pulled back right on time, and a first droopy rope of cum shot from his cock. Before it could land on her face, Katara had raised one of her hands and stopped the cum. Letting his load float in the air as his eyes were closed and he grunted out loudly - eventually looking back down, noticing how Katara was handling the cum. This was a new thing, and well... It was pretty impressive. He would've loved to see more of that, but she let his semen just drop down on the ice beneath them. Looking up at him with a somewhat arrogant look, and he knew he wanted to try and get more of this.

He took a deep breath and then shrugged. "I suppose... If the Avatar insists, I can train you as well." He tried to make up an excuse, but truthfully he was hoping to see more of this unique form of bending. Satisfied and happy with the results, Katara stood back up and smiled back at Aang proudly. He nodded in an approving way, loving to see his girlfriend use her abilities for stuff like this.

And so, the training for the two young benders began with Master Pakku and some other Water Tribe younglings. Day after day passed, and they both proved to be very fast learners. Even though Katara didn't pay him any attention in a depraved way anymore, Pakku had to admit that he was impressed with the girl. She was a fine fighter, and eventually even managed to beat him completely.

But then, their training got brutally interrupted as suddenly, during one of the training sessions, black ash started falling down over the city. It was a concern for everyone, and the Avatar immediately rushed onto the wall to check out the sea.

There were a bunch of ships waiting there, ready for the siege...