The grand ballroom of the Kamisato Estate, usually a place of dignified political discourse and refined cultural exchange, had been transformed into a den of intoxicating sensuality for one night only. Silken drapes of deep violet and crimson cascaded from the vaulted ceilings, and the air itself was thick with the hypnotic fragrance of night-blooming flowers and expensive perfume. It was a masquerade, a tradition from Furina's beloved Fontaine, where identities could be shed like old skins and deepest desires could surface, anonymous and bold. From the world of Genshin Impact, she moved through the crowd with her signature theatrical grace, her azure and white gown swishing around her legs, a delicate silver mask shaped like weeping tears covering the upper half of her face. But beneath the performance, her heart hammered with a nervous, thrilling anticipation. She was not here for mere spectacle; she was here for a rendezvous promised in whispered words and longing glances.

Across the room, near a table overflowing with crystal goblets of dandelion wine, stood Hu Tao, the fiery Director of the Wangsheng Funeral Parlor. Her usual playful macabre was replaced with a smoldering elegance. Her dress was a stunning contrast of black lace and blood-red silk that hugged her slender frame, and her mask was a beautifully crafted butterfly, its wings tipped with gold. A fellow denizen of Teyvat from Genshin Impact, she and Furina shared a unique understanding of the dramatics between life and its end, a connection that had recently blossomed into something far more intimate and heated. Hu Tao’s amber eyes, visible through the mask, scanned the crowd not with her usual mischievous glint, but with a focused, hungry intensity, searching for the one she had come to meet.

Their search ended simultaneously when their gazes locked from across the ballroom. A silent, electric current passed between them, a promise that made Furina’s breath catch in her throat and sent a shiver down Hu Tao’s spine. They began to move towards each other, a magnetic pull drawing them through the sea of swirling costumes, their path taking them past a secluded alcove shrouded in shadow. It was there they saw them, and their steps faltered, captivated by the scene unfolding before them.

Kikoru Shinomiya, the prodigious and fiercely disciplined Defense Force officer from the world of Kaiju No. 8, was leaning against the wall, her posture ramrod straight even in relaxation. She wore a stunning, form-fitting gown of emerald green that complemented her sharp, beautiful features. Her mask was a simple, elegant half-face piece of black velvet, but it did nothing to hide the determined set of her jaw or the intelligent fire in her eyes. And before her, one hand braced against the wall near Kikoru’s head, was Baerys. The dragon-girl Vtuber from the Hololive universe was a vision of playful allure. Her attire was a daring mix of sleek black leather and soft, white fur, hinting at her draconic heritage, and her mask was a intricate piece of silver filigree shaped like curling horns. Her tail, usually hidden, swayed gently behind her with a lazy, possessive rhythm.

Baerys was whispering something to Kikoru, her voice a low, melodic rumble that was both soothing and intensely arousing. Kikoru, usually so controlled and stoic, had a faint blush creeping up her neck, her lips slightly parted as she listened. The tension between them was palpable, a thick cord of unspoken attraction waiting to be snapped. Furina and Hu Tao watched, entranced, as Baerys leaned in closer, her lips brushing against the shell of Kikoru’s ear. The Kaiju No. 8 officer shuddered, her eyes fluttering closed for a brief second before they snapped open and locked directly onto Furina and Hu Tao watching from a few feet away.

There was no embarrassment, no startled jump. Instead, a slow, knowing smile spread across Kikoru’s lips. Baerys followed her gaze, her own dragon-like eyes gleaming with interest and open invitation. "Well, well," Baerys purred, her voice carrying easily over the muffled music. "It seems we have an audience. And such a beautiful one at that." Hu Tao, never one to be shy, stepped forward first, a playful smirk on her face. "A private performance?" she asked, her tone light but her eyes dark with desire. "Don't mind if we join. The best parties always end up in a more... intimate setting."

Furina, her heart pounding with a mixture of nervousness and raw excitement, moved to stand beside Hu Tao, her theatrical persona melting away to reveal the genuinely curious and aroused woman beneath. "The night is about shedding inhibitions, is it not?" she said, her voice softer than usual. Kikoru pushed off from the wall, her demeanor shifting from the pursued to an equal participant in this suddenly expanded dynamic. "I see no reason to limit our enjoyment," she stated, her voice firm yet laced with a newfound warmth. "Four is hardly a crowd. It's a celebration."

The word hung in the air between them, charged and potent. Foursome. It was no longer just a concept; it was a promise, a path they were all choosing to walk down together. Without another word, Baerys offered her hand to Furina, while Kikoru offered hers to Hu Tao. The four of them, a confluence of worlds from Genshin Impact, Kaiju No. 8, and Hololive, left the bustling ballroom behind, ascending a grand staircase to a private suite whose doors closed with a soft, final click, sealing them in a world of their own making.

The suite was lavishly appointed, dominated by a massive bed piled high with silk cushions. Moonlight streamed through the large windows, painting everything in shades of silver and blue. The moment the door closed, the last vestiges of formality vanished. Hu Tao was the first to move, turning to Kikoru and capturing her lips in a deep, searing kiss. It was a clash of fire and discipline, Hu Tao's playful tongue teasing against Kikoru's initially surprised one until the soldier moaned into her mouth, her hands coming up to tangle in Hu Tao's dark hair.

Furina watched, mesmerized, until she felt a warm presence behind her. Baerys’s arms slid around her waist, pulling her back against a firm, generous body. "You are even more breathtaking up close, my lady," Baerys murmured, her lips tracing the sensitive line of Furina's neck, right where her mask tied. Furina gasped, her head falling back against Baerys's shoulder as shivers of pure pleasure wracked her body. Her own hands came up to grasp Baerys's thighs, feeling the powerful muscle beneath the soft leather. "Please," Furina whispered, her voice trembling. "The mask..."

With deft fingers, Baerys untied the ribbon, letting Furina's mask fall away to reveal her stunning, desire-filled face. At the same time, Hu Tao and Kikoru broke their kiss, both breathing heavily. Hu Tao reached up and gently removed Kikoru's mask, then her own, tossing them aside. They were all laid bare now, not just their faces, but their intentions, their hunger for this connection. The foursome dynamic was no longer an abstract idea; it was the very fabric of the room, weaving them together.

They moved to the bed in a tangle of limbs and whispered encouragements. Clothes began to disappear, not in a frantic rush, but in a slow, worshipful unveiling. Hu Tao's black and red dress pooled at her feet, revealing her pale, slender form. Kikoru's emerald gown followed, unveying a body that was both powerful and stunningly feminine, every muscle defined from her rigorous Kaiju No. 8 training. Furina’s Fontaine-style gown was carefully unlaced by Baerys's clever hands, until she stood blushing and beautiful in the moonlight. Baerys herself was the last, her leather and fur outfit giving way to reveal soft curves and the smooth, scaled texture of her tail, which now coiled possessively around Furina's ankle.

They fell onto the bed together, a symphony of gasps and sighs. Hu Tao immediately claimed Kikoru's mouth again, her hands roaming over the soldier's toned stomach and cupping her small, perfect breasts, thumbs circling her hardening nipples. Kikoru arched into the touch, a low groan escaping her lips, her own hands exploring the dip of Hu Tao's waist and the curve of her hips.

Beside them, Baerys laid Furina down amidst the pillows, her draconic eyes glowing with affection and lust. "I've wanted to taste you since I first saw you," Baerys confessed before lowering her head to take one of Furina's rosebud nipples into her mouth. Furina cried out, her back arching off the bed as a bolt of electric pleasure shot straight to her core. Baerys suckled and laved at her breast with an expert tongue, while one hand slid down Furina's trembling stomach, fingers dipping into the slick heat that was already gathering between her thighs.

The room filled with the sounds of their passion: the wet sound of kisses, the ragged pull of breath, the soft, slick sounds of touching and being touched. The foursome evolved naturally, organically. Kikoru broke from Hu Tao's kiss, her eyes dark with need, and leaned over to capture Baerys's lips, sharing the taste of Furina's skin with her. Hu Tao watched for a moment, a wicked grin spreading across her face, before she moved down Kikoru's body, leaving a trail of kisses down her sternum, over her abdomen, until she buried her face between the soldier's strong thighs. Kikoru's head fell back with a choked cry as Hu Tao's tongue found her clit, licking and sucking with relentless precision.

Inspired, Furina pushed Baerys onto her back and straddled her face, lowering her dripping sex onto the dragon girl's waiting mouth. Baerys's tongue was a revelation, long and agile, and she used it to worship Furina with an intensity that had the former Hydro Archin seeing stars. Furina ground herself against Baerys's mouth, her cries mingling with Kikoru's as Hu Tao continued her masterful ministrations.

The foursome was a beautiful, chaotic dance of giving and receiving pleasure. They shifted and moved, each combination explored with fervent curiosity. Furina turned and kissed Hu Tao deeply, tasting herself and Kikoru on her lover's lips. Kikoru, writhing under Hu Tao's mouth, reached out to cup and knead Baerys's breast, pinching her nipple and earning a muffled moan of approval from the dragon girl whose tongue was buried deep inside Furina. They were a circuit of ecstasy, each touch, each kiss, amplifying the pleasure for them all.

Baerys's tail, which had been idly caressing legs and ankles, now slid up with more purpose. Its smooth, unique texture found its way between Kikoru's legs, rubbing alongside Hu Tao's busy tongue, and the dual sensation made the Kaiju No. 8 officer scream her release, her body convulsing violently. The sight and sound of Kikoru's climax pushed Furina over the edge moments later, her body seizing as she came against Baerys's mouth, her voice a broken, melodic sigh.

Breathless and sated for only a moment, the energy shifted again. There was a silent, collective agreement that this foursome was far from over. They rearranged themselves, a tangle of flushed skin and satisfied smiles. Furina lay on her back, pulling Hu Tao down for a languid kiss. Kikoru, her body still thrumming with aftershocks, positioned herself over Furina's face, lowering herself to offer her sensitive, wet folds to the Genshin Impact star's tongue. Furina accepted eagerly, her own orgasm having only stoked her hunger, and she began to lick and suck at Kikoru's core with a newfound desperation.

Baerys moved behind Hu Tao, her hands gripping the funeral director's hips. She kissed along Hu Tao's spine, her tail wrapping around Hu Tao's thigh. With a gentle push, she guided herself into Hu Tao from behind, filling her in one smooth, deep thrust. Hu Tao cried out into Furina's mouth, her eyes rolling back in her head at the sudden, delicious intrusion. Baerys set a powerful, rhythmic pace, each thrust pushing Hu Tao harder against Furina's body, who in turn was driving Kikoru wild with her tongue.

The foursome reached its zenith in this perfect, interconnected configuration. The room was a chorus of moans, the smell of their sex thick and heady in the air. Hu Tao reached back to clutch at Baerys's hip, meeting her thrust for thrust. Kikoru braced herself on the headboard, grinding against Furina's mouth, her own hands pinching and pulling at her nipples. Furina drank deeply from Kikoru, her fingers digging into the soldier's thighs, lost in the taste and the sensation and the overwhelming presence of her three lovers.

One by one, they fell. Kikoru came again with a guttural shout, her essence flooding Furina's mouth. The intense contractions of Hu Tao's inner muscles around her pushed Baerys over the edge, the dragon girl roaring her release as she buried herself to the hilt, her own climax triggering Hu Tao's, who shuddered and collapsed onto Furina. The combined waves of pleasure finally crashed over Furina, and she dissolved into a mindless, shaking orgasm against Kikoru, her cries muffled by the woman's body.

They collapsed together in a spent, blissful heap of limbs, sweat, and contented sighs. The moonlight still bathed them, now witnesses to their satiated peace. They were a mess of intertwined bodies from different worlds—Genshin Impact, Kaiju No. 8, Hololive—all boundaries erased by shared intimacy. Soft kisses were exchanged, whispered words of awe and affection passed between them as their breathing slowly returned to normal. Hu Tao curled into Kikoru's side, drawing lazy patterns on her stomach. Furina lay her head on Baerys's chest, listening to the strong, steady beat of her heart, while Baerys's tail draped over all of them like a comforting blanket. The foursome had been more than a night of passion; it had been a melding of souls, a promise of a connection that transcended the masks they had once worn, a memory of boundless desire that would forever bind them together.