Chapter Text
It was deep in the night. Avatar Aang and his companions had left the airship on autopilot, and were fast asleep… all but Katara, who stood alone on the deck, gazing out into the great dark.
She reminisced about her childhood; finding out that she was a waterbender, one of the last of her tribe; her and Sokka finding Aang in the iceberg, travelling with him as he mastered the other three elements, making friends and vanquishing enemies along the way; seeing Fire Lord Ozai in chains at last, stripped of both his bending and his authority, and the end of the war which had ravaged the world for generations.
Even so, even after she and her friends had achieved so much, fear for the future lingered in her mind. Aang was the last airbender, and so the task of reviving his long-dead nation rested on his and her shoulders... but Katara was of the Water Tribe; what were the chances of their union producing an airbending child? How would Aang react if their first child were born a waterbender, or even a non-bender?
“Katara, right?” asked Tagah as he stepped outside. “Can’t sleep either, huh? Me either.”
Tagah was a mountain of mystery and muscles, which rippled through his robes like waves in an ocean of ochre. Being an Air Nomad, he was long-lost kin to her beloved husband, but he was fifty times older, and in some ways, different in equal measure. His biceps, and chiselled chest, and the robes which clothed them predated the very temple Aang had called home by a thousand years. Aang was old, but Tagah was a walking legend. Katara couldn't help but feel fascinated by the strange man.
“Guess that makes two of us,” Katara replied as she chuckled. “It’s just… we’ve come so far. Aang and I, I mean. It was me who freed him from the iceberg, you know? Just like he did for you, only accidentally. Long story. Anyway, it's just that... he's the last airbender - well, you and him are, I suppose - and we've been trying for children, who we'll love no matter what, but... what if we fail? What if the Air Nomads die with him and you?”
Tagah laughed. "Kids, huh? I can help you with that." He wrapped his arm around Katara’s shoulder, pulling her closer until she landed face-first in his chest. Hard as a rock, but warm and cozy as a pillow by a campfire.
“T-Tagah! What are you doing?!”
“Look, I’ll cut to the chase. I didn’t come out here to talk. I came to fuck your brains out.”
Katara pushed out of Tagah’s grip. “No! I don’t know how Air Nomads did things in your time, but Aang’s my husband, and I’m his wife.”
Tagah laughed. “Your husband wasn’t raised by his parents. He probably doesn’t even know their names, and they almost certainly weren’t married. Hell, I’d be surprised if they even knew eachother’s names - Air Nomad breeding parties could get so hectic, it was almost impossible to keep track of who you were fucking… but they were a necessity to ensure the future of our people.”
“I knew he was raised by Monk Gyatso… but breeding parties? He never told me about that.”
“Well, now you know,” he replied with a smirk. “I’m sure he’ll understand if we have a little party of our own, even if we make a couple babies along the way.”
"I'm sorry, Tagah, but no. You're... charming, but I have to stay loyal to Aang. To my husband."
With a wave of his hand, Tagah summoned a burst of air which dragged Katara back, leaving her powerless to resist it, to resist him. The kiss was so powerful, so overwhelming, that Katara was brought to her knees in an instant, her legs as limp as water.
“Heh. You put up a fight for a moment, there, but as soon as my lips and yours intertwined, as soon as our tongues danced together, I didn’t notice even the faintest hint of resistance. Admit it, Katara - you want this. You want me.”
Katara got up and ran straight for the control room.
“Don’t bother,” Tagah mocked. "I thinned the air in the room just enough to keep your friends asleep ‘till dawn. Wouldn’t want ‘em to interrupt, now would we?”
They were too high up, too far from the ocean, for it to be of any help, and the contents of her water pouch had been used up in yesterday's battle. With no water nearby for her to bend, to defend herself, Katara was out of options.
“If I… if we do this,” Katara replied, “it’ll be just this one time, and then we’re done. Got it?”
“Sure. Got it.”
As Tagah lowered his pants, slowly but surely revealing the dragon that hid within, Katara fell to her knees once more, this time in shock and awe at the weapon of war which swung before her, and slapped her on both her cheeks before rubbing its head against her lips. Aang’s cock was… no, there was no analogy that would adequately encompass the chasm of difference between the two. Aang’s pin-prick was simply nothing in comparison to Tagah’s cock, so big and potent it could've poked a hole in the fabric of the world.
“Get on your hands and knees, bitch.”
Though the night was cold, Katara’s clothes dripped in sweat. Before she even knew it, she’d stripped them all off and gotten on all fours, her moist cunt glistening under the light of the full moon. She could've bloodbent him, stopped him in his tracks, gotten some fresh air into the control room and called for help - and by the spirits, she wanted to - but her body had other plans, as though Tagah’s rough commands awoke some innate, long-forgotten instinct over which she had no power. She was Master Katara of the Southern Water Tribe, beloved wife of Avatar Aang, but all that meant nothing to the alpha male which stood before her. To him, she was a whore waiting to be fucked. To his cock, a hole waiting to be filled.
"Good girl," he said, the tip of his spear just barely gracing the entrance. "Time for your reward."
Words, even thoughts, failed to even begin to describe the rush of shocking pleasure as Tagah’s cock entered her pussy at last. Though she’d slept with Aang many times, starting on their wedding night, in that moment, she felt as though it had actually been Tagah who took her virginity; what she’d done with her husband over the few years they’d been married paled so greatly in comparison that calling it ‘sex’ felt like an insult. While Aang could barely make it halfway in, Tagah filled her cunt to the brim, his cock slamming against her cervix like a battering ram with each thrust.
Tagah flipped Katara over, immediately locking her lips to his as his chiselled chest pressed against her breasts.
“I don’t want you thinking of any face but mine,” he said, “especially not your joke of a husband’s.”
His lips made their way down the length of Katara’s body - her chin, then her neck, then her bosom, then her nipples, then her belly - before finally arriving at her pussy. The feeling, that sweet, sweet feeling, as Tagah’s tongue licked away was unlike anything Katara had ever felt before - Aang had never done anything like it. She’d chalked his reluctance to eat her out to the rigid traditionalism of a supercentenarian, but Tagah’s age numbered in millennia, and he was hitting spots she didn’t even know she had.
“Oh, fuck…” she moaned. “Oh, fuck yes, baby…”
Tagah crawled his way back upwards until his eyes met Katara’s again, quickly ramming his cock back into her now-loose cunt. The look on her face was no longer one of scorned reluctance; written all over it was the desire for more - more of what Tagah had given her, what her husband had failed to give her; pleasure of the highest calibre.
Katara tried to stay strong, to stay loyal to her husband at least in spirit, even as another man fucked her better than Aang ever could, but her resolve grew weaker with each thrust. Soon enough, her muffled moans as she tried with all her might to keep her mouth shut turned into delirious howls that would put a pack of wolves to shame. Though her heart of hearts loved Aang and Aang alone, her pussy had already given in to Tagah wholeheartedly.
"Tell me, Katara. Who's better; me or your joke of a husband?"
'Don't say it,' Katara ordered herself. 'Don't tell him his first thrust into your cunt blew Aang's whole sex life out of the water. Don't tell him this was what you've needed all these years. Don't tell him he's the best you've ever had.'
Tagah chuckled. "You don't have to tell me. I already know the answer - it's written all over that pretty little face of yours. That loser ain't fucking you right, and he never has. Don't worry; I got all the dick you need right here, free of charge."
"S-shut up," Katara replied. "Just keep fucking me."
"Heh. I'd love to, princess, but I'm afraid I'm just about to cum."
Tagah plunged his cock deep into Katara with one final thrust before the milk of five millennia flooded her womb.