Su Mu's breath caught in her throat at Xu'er's words, a delicious shiver tracing its way down her spine. 

The "sin I can't wait to commit" echoed in the fitting room, charging the air with an electric tension.

Xu'er's purplish eyes, filled with desire, held Su Mu's gaze, and for a moment, the world outside seemed to fade away.

"Xu'er..." Su Mu began, her voice a little breathier than she intended. 

Her mind was blank, she didn't even understand why she was doing everything that Xu'er told her to do, without objecting.

Xu'er's smirk widened. She took a slow step closer, her high-heeled boots making a soft click on the boutique's polished floor.

The movement was deliberate, predatory, and utterly mesmerizing. 

"And you, Missy," she purred, her purplish eyes gleaming, "know how to wear a sin perfectly." 

She reached out a hand, her fingers, tipped with dark nails, lightly tracing the curve of Su Mu's hip where the bustier met the sheer stockings. "Did you like it?"

Su Mu's skin tingled where Xu'er's fingers brushed. She could smell Xu'er's unique scent, intensified by the close proximity.

"It's… a lot," Su Mu admitted, her gaze meeting Xu'er's. She swallowed, her throat suddenly dry. 

The air in the private fitting room seemed to crackle with heat. 

Xu'er's desire-filled eyes were like magnets, pulling Su Mu in, and Su Mu found herself unable, and perhaps unwilling, to look away.

"I... I don't know what to think," Su Mu confessed, her voice barely a whisper, yet every word seemed to hang heavily between them. 

Xu'er's smile softened, becoming less predatory and more… inviting. 

"Don't think then," she murmured, her free hand coming up to gently cup Su Mu's cheek. 

Her thumb brushed lightly over Su Mu's lips. "Just feel."

And then, Xu'er closed the small distance between them. The world seemed to tilt as Xu'er's lips met hers. 

The first kiss was surprisingly gentle, a soft exploration, yet it sent a jolt through Su Mu's already excited body. 

It tasted of something exotic and sweet, like the 'Succubus's Kiss' cocktail Xu'er had mentioned earlier, and the unique, intoxicating scent of Xu'er herself.

Su Mu's mind, which had been a whirlwind of confusion and burgeoning desire, suddenly went quiet. 

There was only the touch of Xu'er's lips, the warmth of her hand on her cheek, the soft click of the high-heeled boots a distant memory. 

The Su Yang part of her, the one that had been so apprehensive, seemed to dissolve in that moment, leaving only Su Mu, a woman discovering a new and thrilling world of sensation.

Instinctively, Su Mu's hands, which had been hanging awkwardly at her sides, came up to rest on Xu'er's waist. 

The blood-red corset felt surprisingly soft under her touch, the fabric warming quickly. 

She could feel the strong, steady beat of Xu'er's heart against her own, or perhaps it was her own heart pounding a frantic rhythm.

The kiss deepened. 

Xu'er's earlier gentleness gave way to a more insistent pressure, her lips molding perfectly against Su Mu's. 

It was no longer just an exploration; Su Mu found herself responding with an eagerness that surprised her, her own lips parting slightly, inviting Xu'er in.

"Ahaa…" A soft moan escaped Xu'er as their tongues met, a hesitant touch at first, then a more confident intertwining. 

The taste of Xu'er was intoxicating, and Su Mu felt a heat spread through her, starting from her core and radiating outwards, making her skin tingle and her toes curl.

Xu'er's hand that had been caressing Su Mu's hip now slid upwards, her fingers splaying across the shadow-silk of the bustier, right over Su Mu's breast. 

The touch was firm, possessive, and sent a fresh wave of shivers down Su Mu's spine. 

Even through the layers of enchanted fabric, the heat of Xu'er's palm was undeniable. 

"HAhaaa…" She squeezed gently, eliciting a soft gasp from Su Mu, which Xu'er swallowed with another deep kiss.

Su Mu, lost in the rising tide of sensations, felt her own hands begin to explore. 

Her fingers traced the dramatic lines of Xu'er's red corset, marveling at the feel of the fabric, the impossible narrowness of her waist. 

Emboldened by Xu'er's confident touch, Su Mu's hand moved higher, her fingers brushing against the underside of Xu'er's breast. 

It was full and warm, and she could feel the rapid pulse beneath her fingertips.

Xu'er broke the kiss for a moment, her breath coming in ragged gasps, her purplish eyes blazing with an even more intense fire. 

"Missy…" she whispered, her voice thick with passion, "you have no idea how much I've wanted this…"

Before Su Mu could respond, Xu'er's mouth was on hers again, more demanding this time. 

Her other hand joined the first, both now cupping Su Mu's breasts, kneading them gently through the bustier. 

The pressure was exquisite, a perfect counterpoint to the intensity of their kisses. Su Mu arched into the touch, a soft sound of pleasure vibrating in her throat.

It was Su Mu who initiated the next shift. 

Her hand, which had been exploring Xu'er's breasts, they were just as magnificent as she'd imagined, full and firm beneath the tight red corset. 

She mirrored Xu'er's earlier action, her thumb teasing the already taut nipples through the fabric.

A sharp hiss of pleasure escaped Xu'er's lips, her eyes fluttering closed for a moment. "Yes, Missy… touch me…more," she urged, her voice a husky plea.

The fitting room had transformed into a haven of shared desire for both. 

"Hey there, is everything alright?" Just as they were getting intimate with each other... they heard a small voice of the sales assistant, who came to check on them.

The "Hey there, is everything alright?" from the sales assistant, though polite and softly spoken, was as effective as a splash of cold water.

Su Mu and Xu'er froze mid-caress, their lips still tingling from their last deep kiss, their bodies still pressed close. 

Xu'er's hand was still resting on Su Mu's breast, Su Mu's own hand still tentatively exploring the curve of Xu'er's hip beneath the feathered skirt. 

For a beat, neither moved, the sales assistant's innocent question echoing in the sudden silence.

Then, slowly, almost reluctantly, they pulled apart, just enough to look into each other's eyes. 

Xu'er's purplish irises, which had been dark and hazy with passion, now held a spark of startled amusement. 

Su Mu's emerald eyes, wide and still reflecting the intensity of their encounter, mirrored a similar emotion, a blend of flustered surprise and a dawning, shared humor at their inopportune timing. 

A beat of silence passed, thick with unspoken words and lingering sensations. 

Then, a slow smile bloomed on Xu'er's lips, a mischievous, knowing curve that acknowledged the interruption and the intimacy it had broken. 

Su Mu, catching the look, felt an answering smile tug at her own lips, a silent laugh shared between them that spoke volumes. It was a smile that said, 'Well, that was… something, wasn't it?' and 'Later.'

With a sigh that was only slightly exaggerated, Xu'er gracefully disentangled herself, creating a sliver of space.

She gave Su Mu one last lingering look, a silent promise in her eyes, before turning towards the curtain of the fitting room.

Su Mu quickly smoothed down the front of her bustier, her fingers trembling slightly, her cheeks still flushed a deep rose. 

She tried to compose herself, though her heart was still doing a wild drum solo against her ribs.

The sales assistant, who had helped them earlier, stood patiently outside the fitting area.

Her smile was perfectly professional, her demeanor unreadable, as if interrupting passionate trysts in high-end lingerie boutiques was an everyday occurrence.

"Were the selections to your satisfaction, ladies?" she inquired smoothly, her gaze flicking politely between Xu'er, who emerged looking entirely composed in her dramatic red and black ensemble, and Su Mu, who likely still looked a bit dazed and beautifully disheveled in her new shadow-silk and lace.

"Perfectly satisfactory, darling," Xu'er purred, though a playful sparkle remained in her eyes when she glanced at Su Mu. 

Following that, after changing back to their old dresses, she gestured towards the collected items – Su Mu's bustier, stockings, and robe, and her own corset, skirt, and boots. "We'll take all of these."

The sales assistant nodded, her professional smile firmly in place, and began to carefully gather the expensive garments. 

She led them to a small, discreet payment counter at the back of the private fitting area, where she expertly and efficiently tallied the cost. 

The final sum, displayed on a sleek, minimalist holographic interface, was undoubtedly not a small amount.

Xu'er, however, seemed utterly unfazed. 

With a nonchalant air, as if purchasing everyday groceries, she reached into a small, embroidered pouch that hung from her wrist. 

She withdrew a single, glowing spiritual crystal. 

It was about the size of a pigeon's egg, a deep, pulsating hue, and it radiated a faint warmth and a considerable amount of pure spiritual energy that Su Mu could now clearly sense. 

Handing it to the sales assistant, Xu'er simply said, "This should cover it, and you keep the change, dear."

The sales assistant accepted the crystal, her fingers brushing Xu'er's briefly. 

Her professional smile didn't waver, but Su Mu caught the slightest widening of her cat-like eyes as she recognized the crystal's quality and value. 

It was clearly worth far more than the already expensive purchases. 

Their purchases were carefully wrapped in silky, dark paper and placed in elegant bags.

Su Mu felt a slight pang of guilt at the expense, but Xu'er waved it away. "Don't even think about it."

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