I had one more idea, this is loosely based on some fan art I saw on the web a while back
A steamy situation
Aang, Sokka and Zuko had been exploring a long-abandoned air temple, hoping to find clues about its former inhabitants. As they climbed higher among the crumbling spires, Zuko noticed a faint wisp of steam drifting from a nearly concealed opening.
"Check this out," he said, pushing aside a boulder to reveal a hidden chamber. Within was a pristine sauna, its heated stones still radiating warmth after a century. "Think the monks built this?"
Soon the boys had stripped down to their wrappings and relaxed with contented sighs upon the heated benches. The stress of their quest melted away as endorphins surged through sweat-slicked skin.
It was then they heard Toph's voice echoing as she searched for her missing friends. "Twinkle Toes! Where'd you run off to?" The earthbender soon located the hidden room's vibrations and stomped inside, clothes and decorum forgotten.
"Well, well, looks like I interrupted a private little spa party!" She grinned, letting her robes fall open to reveal her nubile curves. The sight of her perfect breasts and thatch of dark curls had an instant effect on the already stimulated young men.
Zuko swallowed, his manhood stiffening against his thigh. "Toph, I don't think the monks intended for their sauna to be used this way."
Though she tried to play it cool, the earthbender was flustered at walking in on the boys in all their naked splendour. But her curiosity was piqued, and Toph had never been one to back down from anything.
"Well, don't stop on my account," she said with false bravado, trying to hide how her own body was responding. She traced idle patterns on the stone floor, feeling out their racing heart rates and swollen manhoods.
Zuko shifted uncomfortably, subtly adjusting his rising member. "Toph, I don't think—"
"Oh, hush, you prude." Toph stomped over and plopped down between Aang and Sokka, pressing herself against their heated skin. "It's not every day a girl finds three half-naked hotties all to herself."
Her hands began to roam their slick torsos, eliciting gasps and twitching muscles. When she deliberately grazed Aang's cock, he couldn't contain a groan.
Zuko swallowed thickly, his control fraying. "Toph, we really shouldn't..." But even he made no move to stop her exploration.
Toph giggled, nipping Sokka's ear. "Admit it, you big baby. You want this just as badly as I do." Her hand closed around Zuko's length, eliciting a choked growl.
"So what's it gonna be, boys? You gonna make a girl's naughty dreams come true?"
She marvelled at their differences - Aang, smooth and slender like polished jade; Sokka, long and rigid as steel; Zuko, thick and throbbing like molten rock. As her hands glided along their lengths, she noted their textures, sizes, the unique twitches and pulses elicited by her feathery touches.
The boys gasped and trembled under her ministrations, helpless to the exquisite sensory overload. Sokka was the first to spill with a guttural cry, spurting his seed across Toph's questing fingers. The musky scent spurred her own arousal, slick heat pooling between her thighs.
She turned to the Avatar next, gripping his turgid flesh and pumping with deliberate strokes. Aang cried out wordlessly, clutching the stone as his release coated them both. Zuko watched, transfixed, as Toph turned to him at last. 'Your turn, Sparky,' she purred, taking his burning rod in hand.
Zuko inhaled sharply at her touch, his rod pulsing in her small fist like a living thing. Toph explored him leisurely, mesmerized by each twitch and throb she coaxed from his burning flesh.
She marvelled at his thickness, so different from the others. Her hand could barely span his girth as she pumped with slow, steady pulls. Zuko groaned through gritted teeth, fighting to restrain himself under her sensual ministrations.
But when she swirled her thumb through the bead of moisture gathered at his tip, he lost all control. "Toph!" he gasped, hips bucking helplessly into her hand. His seed spilled forth in thick jets, coating her wrist and palm.
She lifted her hands, inspecting the pearly essence with a satisfied hum. The musky scent spurred fresh arousal, her nub aching and swollen between her thighs.
Toph gasped as the airbender's nimble fingers started teasing her swollen pearl through her robes. Sokka joined in, tugging the remaining fabric down to expose her glistening cleft. Zuko knelt before her, mesmerized by her feminine folds.
"So wet already, Toph?" he purred, dragging his tongue along her slick arousal. She keened at the exquisite new sensations, gripping Sokka and Aang for support. The water tribesman took one pert nipple in his mouth while Aang nuzzled her neck.
Zuko flicked his tongue expertly over her swollen nub, eliciting a stream of breathy curses. He slid two fingers deep inside her pulsing channel, crooking them to find that sweet spot. "Spirits, right there!" Toph cried, grinding down on the delicious invasion.
Aang slipped his own digits into her back entrance, thrusting in tandem. Overwhelmed with ecstasy, Toph shuddered violently into her release, coating Zuko's chin as her walls milked his hand.
Collapsing against their slickened forms, she panted, "Let's get this started, boys."
Sokka gripped her hips, gazing upon her gorgeous nude form as she straddled him. Toph leaned in to capture his lips hungrily, grinding her slick folds along his stiff manhood. Sokka groaned into the kiss, hands roaming her curves.
When they broke for air, Toph reached between them to line him up at her entrance. Slowly, teasingly, she sank down upon his rod, relishing the stretch and burn. Sokka squeezed her ample backside, encouraging her descent until he was fully sheathed.
They both moaned at the exquisite joining of flesh, still sensitive from their prior pleasures. Toph set a grinding pace that had them both panting, her movements guided by Sokka's hands. The firebender and avatar watched intently, stroking themselves to the erotic display.
Zuko moved behind Toph, pressing his hardened length between her cheeks. She moaned wantonly at the new intrusion, grinding back on instinct. Gripping her hips, Zuko slid home with one deep thrust.
Aang knelt before them, stroking his smooth cock. "Toph, may I?" She nodded fervently. The avatar guided himself to her waiting mouth, sighing as she engulfed him eagerly.
So the trio took their earthbending instructor in a scorching spit roast. Toph was lost in bliss, filled at both ends as Sokka pistoned within. Zuko and Aang set a punishing pace, chasing their peaks.
As their passions reached a fever pitch, Toph felt another climax building deep within. She clenched down involuntarily on the three cocks filling her so deliciously full, a guttural moan escaping her lips.
Zuko growled at the exquisite pressure milking his length from behind. He redoubled his thrusts, slamming into the earthbender with abandon.
Sokka was likewise driven over the edge by her pulsing walls. He pistoned up hard and fast, chasing his own release.
Even calm Aang couldn't hold back from such stimulation. He felt Toph's muscles convulsing around his rod as she came, triggering his own orgasm with a cry.
Wave after wave of pleasure crashed through Toph's lithe form, dragged on and on by the boys' relentless pounding. Every pulse of her inner walls sent fresh sparks racing across hypersensitive nerve endings.
By the time her quaking climax finally subsided, the boys were spent as well. With guttural shouts, they found their peaks, filling Toph to the brim with their hot seed.
She collapsed in a sweaty, sated heap, basking in the afterglow of their shared passion within the secret sanctum.
While passion still simmered within the hidden sanctum, our insatiable trio had momentarily spent themselves in debauched bliss. Ever attentive to his companions' needs, Aang withdrew to allow others a turn at bat.
Zuko, fuelled by ardour's flame, was not yet sated. He stood upon unsteady legs and lifted Toph's limp yet willing form. She eagerly wrapped her limbs around his torso, breasts squished against his muscular frame.
Re-entering her slick heat in one smooth thrust, Zuko pinned Toph against the warmed stone with deep, rolling hips. She moaned wantonly, meeting each drive with fervent rolls.
Behind her, Sokka too had regained vigour. Guiding his stiff rod, he breached Toph's back door with a satisfied groan. Sandwiched firmly in place, with Zuko's rigid manhood pumping vigorously within her tight channel from the front while Sokka's similarly stiff rod filled her ready rear in deep, steady strokes, Toph was lost in blissful delirium.
Every meeting of their loins sent shockwaves of rapturous sensation coursing through her lithe form. The dual invasion filled her so completely that she could think of nothing else. Overwhelmed by the intense fullness and stimulation at both ends, Toph threw her head back with a wanton moan, surrendering fully to the throes of building rapture.
Her inner walls began to spasm uncontrollably, dragging the boys closer to their own peaks. With Zuko and Sokka pistoning in perfect synchrony, Toph felt another powerful orgasm seize her body and mind. Wave after wave of ecstasy crashed through her, leaving her a quivering, incoherent mess suspended blissfully between the two masculine figures.
As Toph hung suspended in ecstasy between the two young men, her inner muscles began pulsating wildly around their invading lengths.
Zuko and Sokka were helpless against the exquisite sensations of her clenching depths, pulling and massaging them relentlessly. The firebender and warrior redoubled their frenzied pistoning, slamming into her from both ends with abandon.
Toph cried out unintelligibly, lost in an endless orgasmic peak, as her pulsing inner walls dragged out the boys' climaxes. With guttural shouts of primal rapture, Zuko and Sokka plunged deep as their releases were wrenched from them.
Streams of hot seed pumped endlessly into Toph's clutching muscles from both ends. She shuddered violently through the aftershocks, gripping them tightly within her vice-like sheath as it milked them for every last drop.
By the time their shared ecstasy finally ebbed, the three friends collapsed in a sweaty, sticky, utterly sated tangle.
As Toph lay in a blissful daze, recovering from her climax, Aang's attentions turned once more to the earthbender.
Ever gentle and attentive, the young Avatar climbed atop Toph's limp yet willing form. Propping himself on steady arms, he guided his reawakened length to her slick entrance. Aang entered her slowly, savouring each delicious inch.
Beneath him, Toph sighed in contentment, too blissed to do more than wrap her limbs loosely around his back. Aang set a languid, sensual pace, pulling almost fully out before sinking smoothly back in. He gazed down upon her ravished beauty, committing every detail to memory.
As Aang entered her in slow, deliberate strokes, Toph sighed at the exquisite fullness stretching her inner walls once more. Though well-used already, her most sensitive flesh still responded keenly to his gentle ministrations.
She could feel every ridged inch of his taut length gliding in and out, every subtle twitch and pulse within her clutching muscles. Atop her limp yet willing form, Aang settled into an unhurried rhythm designed to prolong their joining.
His firm yet pliant rod stirred her deepest depths with each rolling thrust, finding that hidden bundle of nerves. Toph keened softly, lost in the blissful haze of intimacy. Her nipples peaked against his chest, arousal gathering once more within her core.
As Aang continued his languid yet focused ministrations, Toph felt the familiar tightening deep within. Her walls began to pulse and flutter around the young Avatar's penetrating length with growing intensity.
Aang felt the exquisite sensations throbbing through his own taut rod in response. Locking eyes with passionate intensity, they surrendered fully to the building rapture consuming them.
Toph cried out softly as waves of bliss crested within her, spilling forth in a rush of slick heat. The feeling of her pulsing inner muscles sent Aang toppling over the edge as well.
He plunged deep one final time and stilled, pouring himself into her quivering depths with a guttural moan of release. Wave after wave of ecstasy wracked their joined forms as they floated upon passion's crest together.
Lost in each other's embrace, they rode out their climaxes slowly, prolonging each rippling aftershock of pleasure.
As night fell upon the hidden sanctum, spent passions had run their debauched course within. The four friends lay in a satiated tangle, basking in intimacy's afterglow.
Zuko and Sokka curled around Toph, caressing her sweat-slicked curves, while Aang held her from behind. Their touches had lost urgency, becoming languid, worshipful caresses mapping every dip and swell with adoring palms.
Toph sighed blissfully, letting the boys' ministrations lull her towards slumber. She felt only deep connection, trust and care from her powerful yet gentle partners. Their mingled scents and the rhythms of their heartbeats soothed her into peaceful relaxation.
For now, this is the end; as I'm running out of ideas.
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