Yes, with Katara’s warmth

The flickering light of the oil lamp cast long shadows across the tent’s canvas walls, the air thick with the scent of burning whale oil and the chill of the Southern Water Tribe night. Sokka sat cross-legged on a fur-lined mat, his eyes closed in what appeared to be deep concentration. Beside him, Katara and Gran Gran watched intently, their faces etched with a mix of hope and uncertainty.

“Sokka, are you sure you're feeling up to this?” Katara asked, her voice soft and yet tinged with sisterly concern, “Meditation can be taxing, especially when you have no experience with it.”

Sokka didn't open his eyes. Instead, he smiled inwardly, feeling the power of his newly discovered Avatar abilities coursing through him, “I'm certain, Katara. I need to do this. For our tribe, for the world,” his words were calm, confident, but beneath the surface, a different plan was forming.

Gran Gran nodded, her aged face softening with understanding, “Very well, child. We will support you in whatever way we can.”

Sokka took a deep breath, channeling his energy. He knew he could manipulate their thoughts, bend their wills to his own with the strange powers he’d been granted after his incestuous wet dream. It was a dangerous power, one he had only recently unlocked, but now, Sokka was assured of himself, and finally saw the power for the gift it was meant to be, “Katara,” he began, his voice steady, “I need you to help me focus. In order for me to properly meditate and reach the spirit realm, I need... physical warmth.”

Katara frowned, confused, “Physical warmth? How can I—”

Before she could finish, Sokka exerted his control, planting the suggestion directly, “In order for a male Avatar to meditate, they need their cock to be fully submerged in the throat of a blood relative. I need your mouth, Katara.”

Her eyes glazed over momentarily, then cleared as she processed his command. Without hesitation, she knelt beside him, her hands reaching for the hem of his pants as she moaned annoyedly, “Damnit… I forgot about that old tradition. I guess being the sister of the Avatar isn’t gonna be all fun and games for me. How annoying… You better not go and get excited at the fact that I’ll be warming your cock so often from now on, I’m still your sister, I’m only doing this because you’re the Avatar and I know you need my help.”

Gran Gran, under the same influence, watched silently, her expression neutral, though a flicker of concern briefly crossed her eyes before she interjected, “You’re brother is right Katara, the old stories do make it quite clear that a sibling’s throat was always necessary for an Avatar to properly mediate. And there’s nothing to be ashamed of dear, it’s a great honor for a girl to be the cock warming sister of the Avatar.”

Sokka felt a surge of adrenaline as Katara's fingers deftly unfastened his belt, sliding his pants down to reveal his hardened length. The air was cold against his skin, but the anticipation was electric, “That's it,” he murmured, his voice filled with excitement and anticipation, “Warm me, Katara.”

Katara leaned forward, her lips brushing lightly against the tip of her brother’s cock. Sokka inhaled sharply, his body responding instinctively to her touch. With a gentle grip, she guided him into her mouth, her tongue swirling around him as she began to bob her head slowly, her technique somewhat pitiful, because of the lack of literally any boys her own age in the Southern Water Tribe.

The sensation was still exquisite, however, each movement of his sister’s mouth sending ripples of pleasure through Sokka's body. He kept his eyes closed, focusing on maintaining his connection to the previous Avatars, while also reveling in the intimate act being performed by his little sister.

Gran Gran shifted slightly, her gaze fixed on the scene before her, her expression still unreadable. Sokka could sense her internal struggle, the conflict between her instinct that sexual acts between siblings are sinful and her newfound knowledge that Avatars must put their dicks inside their siblings throats in order to properly enter the spirit world. It fueled his resolve, making him even more determined to succeed in his meditation.

As Katara continued to dutifully warm her brother inside of her, Sokka felt his consciousness begin to expand, the boundaries of his mind blurring as he sought entry into the spirit world. The warmth of Katara's mouth was a tangible link, a physical anchor that grounded him even as he floated further away.

“Keep going,” he whispered, his voice barely audible over the crackling of the fire, “I'm getting closer.”

Katara responded by increasing her pace, her hand now joining her mouth in a synchronized dance around his throbbing member. Each stroke, each suckle, was deliberate, designed to heighten his senses and sharpen his focus.

Sokka's breathing quickened, matching the rhythm of Katara's actions. He could feel the presence of the past Avatars, their energies swirling around him like ethereal currents. The line between the physical and the spiritual was thinning, and he was poised on the brink of crossing over.

Just as he felt himself about to break through, a sudden burst of noise from outside the tent jolted him back to reality. Katara paused, her eyes meeting his for a fleeting moment before she resumed her task, her movements more urgent now.

Sokka gritted his teeth, frustration mingling with the rising tide of pleasure. He needed silence, isolation, to complete his journey, “Gran Gran,” he said, his tone commanding, “Make sure we're not disturbed.”

Gran Gran nodded, her resolve solidifying once more under his control. She rose quietly, moving to the entrance of the tent to ensure their privacy.

Alone again with Katara, Sokka refocused his efforts, pushing aside the distractions. He could feel the spirit realm beckoning, its mysteries tantalizingly close, “Almost there,” he breathed, his voice strained with effort.

Katara seemed to sense his urgency, her actions becoming more aggressive, her mouth and hand working in unison to bring him to the precipice. Sokka's body tensed, his muscles quivering as he fought to maintain his concentration.

And then, with a final, powerful surge, he broke through. As he felt his release explode out from his cock and down his sister’s loving throat, the physical world around him dissolved into a kaleidoscope of colors and sounds, the voices of the past Avatars whispering in his ears. He was in the spirit world, connected to every Avatar who had come before him.

Yet, even as he reveled in this newfound connection, part of him remained anchored by the sensation of Katara's mouth, the warm, wet embrace serving as a reminder of the physical world he had left behind.

“Sokka,” Katara murmured around his cock, her voice distant yet clear, “Are you... are you seeing them?”

He didn't answer, couldn't answer, his consciousness spread too thin across the vast expanse of time and space. But he felt her concern, her worry, and it grounded him further, tethering him to the present even as he explored the past.

Time lost meaning in the spirit world, moments stretching into eternity. Sokka floated, learned, absorbed small pieces of the wisdom of those who had mastered the elements before him. And through it all, Katara's mouth remained, a constant source of warmth and desire, a testament to the power he wielded and the risks he was willing to take.

As he drifted deeper into the realm of spirits, Sokka knew he had crossed a threshold, both as the Avatar and as the new God of ****. The consequences of his actions would be great, but for now, he was content to explore, to learn, to become the Avatar he was destined to be, in order to save the world!