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Katara couldn't hold it anymore. She, Aang, and Sokka had been flying on Appa over the ocean for hours, with no land in sight. It had been easy to contain herself at first, but now it began to get worrisome. Katara squirmed in place, wondering if she would have to void her waste right here.
"Um, Aang? Do you think you could find some land soon? I kinda have to..."
"Oh," he said, looking back in embarrassment. "Yeah, sure. I'll try to find someplace to land. Yip yip!"
"Thanks." That gave her some temporary relief, but soon she was getting uncomfortable again. It was really hard to hold it now. And amidst all her bodily discomfort, she also started to feel aroused at the thought of just letting it all out right here. She had an excuse, after all.
"Actually... I don't think I can hold it. I have to go," she said, pulling off all her clothing to get completely naked. Sokka and Aang stared in shock, but did not protest. Aang let go of Appa's reins and hopped right into the saddle to get a closer look. Her breasts bounced out of her top, and her pussy and ass were bare for them to see.
She laid down onto her back, raised her hips, and spread her legs wide. Without holding back anymore, she began spraying piss out between her thighs, gushing it all over the saddle, Appa's fur, and letting the wind take the rest of it away. She moaned long and loud, rubbing her pussy as it flowed out of her, not stopping anytime soon.
"Fuck, that feels so good," she moaned. She watched Aang and her brother stare at her body in obvious arousal, and then watched them strip too to start rubbing themselves.
"Katara, you're so hot," Sokka said. "I wish I could have seen my sister naked and pissing before now."
"Me too," Aang said. "Can I come closer?"
"You both can get covered in my piss if you want!" Katara said, smiling. So the boys both scooted closer and began to get covered in Katara's hot pee. Her hand was covered in her own juices as she flicked her clit.
"Aahn, I'm gonna shit too. Here it comes~"
Hot, sticky brown logs flew out of her asshole one by one, splattering all over the boys and forming a huge, messy pile under her. Katara turned over, pressing her boobs against the saddle and shaking her ass up in the air as it gushed messy shit all over. She continued to hungrily play with her own pussy and used her other hand to grab her own boob, fondling it and pinching a nipple.
"Hhhnn, I'm gonna go too!" Aang declared, letting his bowels go and shitting into the saddle, adding to Katara's pile. He came while shitting, covering Katara in cum and shit. After he finished cumming, he added his own piss to the mix, his stream mingling with Katara's, which was still going.
Soon Sokka was pissing and shitting too, and he grabbed Katara, pulled her up, and kissed her on the lips. She moaned and kissed back into him, and the two began to make out while grinding together and pissing and shitting so much that the whole saddle had already filled up with their waste, causing it to overflow.
Aang, not wanting to be left out, forced his tongue in, and started a three-way make out session. Aang and Sokka's dicks rubbed against each other and on Katara's body, covering it in pee. Their scat only grew in size and speed, catapulting off the side of Appa and landing into the sea. Sokka brought Katara back to the floor of the saddle, or more accurately, submerged her in their mixed shit, and began fucking her pussy hard. Aang then angled his ass so he was shitting right on top of her face, and her mouth was filled instantly. He proceeded to cover her face and breasts with shit and piss, then groped her boobs and licked all around her mouth, making out with his shit between their tongues.
Once Sokka was done shooting a few loads of his cum into his little sister, Aang took his place, fucking her underage pussy with his hard dick which was still pissing. Sokka kissed Aang and they made out while he fucked her. None of them knew how they were letting go of this much waste, but it felt too good to question. They just wanted to cum their brains out. They knew at this point that their bathroom breaks would never be private again.
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"Hey Toph, do you mind if I piss in the saddle?"
Toph blinked at the question. She didn't think her piss fantasies would ever come true, let alone on her first night leaving home.
"Actually, I wouldn't mind at all, Katara. That's super fucking hot."
"Great! We all love pissing and shitting on each other while fucking, and I just thought I should let you know beforehand, in case you weren't okay with it."
"I am okay with it. In fact, why don't you fuck me right now?" Toph said, quickly stripping nude.
Each of the others stripped and lunged at her, and took turns kissing her mouth hungrily. Toph began casually pissing, each of them getting covered in 12-year-old girl pee. Aang shoved his dick into her without warning and began fucking her hard.
"Aaahh, yeah, this is what I've been missing!" she said with glee. "I wanna get fucked like this constantly! Sokka, take my ass!"
"Not gonna turn that down," Sokka responded, and started pummeling her little pale ass, double fucking her with Aang, both of them pissing into her holes. Katara angled her crotch above Toph's face and let her pee blast out onto it, soon followed by her poop. Toph opened her mouth happily to let the sweet girl waste fall on her tongue and down her throat, and the shit curled on her face, some dropping down to her little growing boobs.
Aang and Sokka both orgasmed while fucking Toph, then pulled out. Toph immediately gushed shit out of her asshole, no longer being held back by Sokka's dick, and the boys responded by resuming their piss streams and letting their bowels loose all over her body as well, covering every single inch of her with shit, which she smeared into her skin with bliss.
"This is the best fucking day ever," she tried to say, but her mouth was full of shit and Katara's tongue, so it probably just came out as gargles. That was okay, though. She just sucked back on Katara's tongue and looked forward to more naughty days with the gang coming in the near future.