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cottoncasp · 5 months ago

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Dr. Ratio x Aventurine NSFW Writing // Honkai Star Rail

As he meandered along the slick cobblestone sidewalk, the air was thick with the smell of sulfur and a husky earth scent that was strengthened by the pouring rain. Aventurine kept a playful eye on the towering spires that loomed overhead. Each structure he catched between his neon eyes seemed to scrape across the usual sky, stars reflecting the light that the buildings shined back, it's silhouette’s dazzling across Aventurine’s empress-teal tinted turtleneck.

The gorgeous night sky blanketed everything in an ethereal twilight, stars dotting the inky sky like a scattering of diamonds. He would love to sit back and gaze at it, admire it, drown in it, but he had to arrive at the shop soon. Besides, the rain was heavy and the walking grounds soaked; countless puddles were covering it and making a small flood, it started to soak his dress shoes. He smiled slightly to himself and continued to navigate the familiar route through this ever-night planet. He had always loved this planet, the way it made every venture feel like a celestial dream. The shops here had everything he favored, and everyone was a charm among these sleek roads.

The rhythmic tap of his soused shoes against the wet stone was the only sound accompanying him through the deserted streets, he found it odd no one was out here. Yes, he was in the further side west, however this was a surrounding people bustled about. His best guess was the rampant rain, its relentless and utterly cold companionship that plastered against his peacock themed umbrella. Though he didn’t mind, it added a sense of grandeur to the night’s mission.

Aventurine turned a corner, and the Poison Sommelier’s shop came into view. The unassuming storefront was tucked between two broader buildings, an elegantly carved piece of obsidian, swayed gently in the wind, the intricate lettering spelling out "Poison Sommelier" in a curling, archaic script that glowed faintly with golden snail slime. A scintillating light from inside cast eerie shadows on the rain puddles that dotted the entrance. He quickened his pace, the anticipation of picking out a unique and exquisite poison for himself propelling him forward in excitement.

As he pushed open the door, the small copper bell above it jingled softly, announcing his arrival. Its aroma was that of a wood-scented smell, a stark contrast to the sulfurous tang outside. The exterior of the shop was a smooth gleam of beige and a fresh petrichor scent came from the dark wood that outlined each vessel and corridor of this place. A vast, arched glass cover dominated the east, showcasing an array of exotic and poisonous however stuffed, dead animals. A vague cyan light shining over them, causing highlights to form on their lifeless beady eyes.

Aventurine shut the door rather unconsciously, but his eyes pondered down to examine it as well. The handle, a tarnished brass serpent coiled around an emerald, felt nice and cold under his touch. The door frame a black obsidian, covered with golden undertones. He traveled his eyes back to the east, the rest of the shop was a labyrinth of narrow aisles lined with towering shelves, each crammed with expensive and foreign glass vials, bottles, and jars. The air was thick with the mingling scents of various herbs, potions, and poisons, creating a heady, intoxicating aroma. Soft, mari-gold light from antique sconces bathed the room in a warm glow, casting long shadows that danced across the floor. It certainly had the sense of a cozy but odd circumambient.

The shelves themselves were an interesting mix of polished wood and smooth iron, each one adorned with delicate carvings of famous combat soldiers (specifically those who worked with magic) and arcane symbols. Some shelves housed rows of neatly labeled bottles containing vibrant, swirling liquids, while others displayed dried herbs, preserved creatures, and strange, unidentifiable objects. In one corner, a glass case held a collection of ornate, venomous daggers and needles, each one glinting menacingly under the soft light. Aventurine was immediately drawn toward it. A pure-black one with astronomical sculpting on the tang and rivets. He chuckled slightly to himself, foolish of him, it wouldn’t prove use. It was supposedly a stealth mission, not straight on combat. Daggers were too obvious. He would need something like a liquid or food to sneak in the dinner. Ricin sounded like a good option, he might slyly sink it in the lobster. Perhaps, he could ask the poison sommelier to get some pufferfish from the back and souse their tetrodotoxin out. One drop and it could paralyze and be the end of you. But it would be easier to get caught by if it strikes too soon in the dinner, but the bigger the risk, the better the reward.

The floor was covered with a mosaic of intricate tiles, their patterns forming a mesmerizing design that seemed to shift and change as Aventurine moved away from the section of venomous weapons. The tiles depicted scenes of alchemical processes, mythical beasts, and ancient rituals, while the receptionist desk was bolted into a soft cushiony carpet area, a fiat beige, a bit darker than the glossy walls. A thin line of pitch black rutilated quartz separating the carpet and marble tiles.

At the back of the shop, behind a counter cluttered with alchemical tools and half-finished scrolls of ingredients, stood the shopkeeper or otherwise the Poison Sommelier himself. A man of medium height and a rugged build, his face bore the scars of years dealing with dangerous substances and equally deadly individuals. Sharp, piercing multi-colored eyes peeked out from his mop of dark hair streaked in green, and other odd colors that seemed to radiate poison as his whole persona suggested. He wore a tough leather jacket, with an emerald undercarriage that hinted at his skill to deal with both natural and toxic materials.

Aventurine’s eyes traveled down to the belt circled around his waist, he was mostly interested in the vials of venoms and various pouches of.. blood? His hands, or rather gloves that were stained with the same substance, moved across the desk as he seemed to label a new batch of venomous potions, barely glancing up from his work.

He took in a deep inhale and trudged toward the copper desk, “Greetings, I hope your day has been good, Mr. Windward! I’ve come here for a midnight appointment that I signed for about a week ago?” The sandy-haired man gave a cheeky smile, You know? The Patrevia assassination, I need a one-hit vial.” Aventurine solicited, adjusting his poplin shirt collar with leathered gloves.

The owner of the name looked up from his activity, turning his head to catch the magenta eyes mischievously smiling at him. Windward parted his lips, “Ah.. it’s just you gambler.” He paused for a moment, “A one shot? You know that you could just use ricin, it doesn’t require a professional to obtain it.” He grumbled, setting down the phial he was labeling and stood up straight; his hands being wiped dry with a nearby cloth.

Aventurine lifted his shoulders into a half shrug, “Well, I wouldn’t have come here if I just wanted ricin, don’t you think? I obviously want something stronger, and your job is to give it to me.” He pointed at the husky man as he spoke.

Mr. Windward eyed the tone with a glint, turning to open the intricate backgate of the reception desk with a vexed attitude, motioning his client with a flick of his wrist. “Head to the back and enter a dark green door, it has the deadly items, so be careful,” he ordered, beckoning Aventurine to a narrow corridor, tossing the keys to him which Aventurine catched easily.

Aventurine gave a bantering beam and nodded, pocketing the keys with ease. “Will do, Windward,” he remarked, heading toward the indicated corridor.

Windward’s eyes followed the young man as he padded before returning them to his phial of venom. Only to be jumpscared by the sudden appearance of a tall, imposing figure who adorned a deep frown.

…

Windward returned the same expression, recognizing the man immediately. “I don’t remember you asking for an appointment, Dr. Veritas. What are you doing in my shop so late?” He stood to block the violet-haired man from proposedly entering the back where Aventurine had wandered off into. “And why are you daring to go into prohibited places without my permission?”

Ratio crossed his arms, his abs flexing slightly through his tight shirt. Squinting his eyes with haughty inflection, “I’ve arrived here with my dear, however damned gambler,” He took an intimidating step forward, “He has, in my infinite wisdom, sought my assistance looking through the vials. So, it would be dearest of you if you let me through, I can’t leave the poor wretch to flounder without my guidance.” He pouted arrogantly, or rather lied with a dire undertone.

The gruff man remained in his posture, giving Ratio a firm glare, “That’s not a valid reason, I only let those who I trust through that door, besides, why can’t you just wait out here for him?”

Ratio’s coral eyes narrowed once more, “Pray tell, are you inflicted with a hearing impairment, Windward? How am I supposed to assist him with the vials if denied entry?” He complained, taking yet another step, towering over the other man with his eyebrows furrowed deeply against his brow.

“I’m sure he can figure it out himself, and in addition, even if you came with him, you shouldn’t be in my shop without a prescription. Therefore, and respectfully, the door is behind you.” Windward pointed past Ratio, leering into that disdainful gaze.

Ratio leaned forward, his face merely inches apart as his wavy violet hair trickled on his nose, the corners of his lips emerging into a disgruntled smile. “Your presence seems to be an idiotic waste of my valuable time.” He returned to his past stance, watching Windward go silent in vexation. “Hmph.” With that, he bumped past the Poison Sommelier and slinked into the hallway, easily completing the first step of his intended plan.

…

Aventurine hummed contently to himself, the soft mari-gold light from the greenhouse fading as he ventured deeper down the rows of shelves. The walls held a copious amount of holders, each containing various crates, boxes, jars, and vials. It was larger than he had expected, with high ceilings and glass cabinets beautifully gleaming from the fake sunshine. It showcased rare and exotic toxins inside each of the glasses, each vial and bottle holding the promise of a silent and lethal efficiency. They were all meticulously organized, each section dedicated to different categories of poisons and venomous substances.

The center of the room featured a large, wooden work table covered with various tools and ingredients; phials filled with bubbling liquids, and half-written scrolls of alchemical formulas cluttered the surface. Aventurine approached the table, running his gloved fingers over the tools, appreciating the craftsmanship and the care that had gone into building and maintaining this ancient building.

His eyes roamed over the labels on the shelves, recognizing some of the names: nightshade, belladonna, arsenic, cyanide. The others were less familiar but just as interesting, exotic names from distant lands that promised effects ranging from swift and painless death to prolonged agony. He needed something special, something that would ensure the success of his mission without leaving any trace back to him.

NSFW/Sexual themes are past this point, view at your own discretion.

A soft creak from the door caught Aventurine’s attention. He swiveled to find the figure of a man he knew very well. “Veritas,” he greeted, his tone light and casual, though his eyes showed a flicker of surprise. “What brings you here at this hour-?”

Ratio closed the door behind him, the sound echoing in the confined space. “I could ask you the same thing, gambler,” he replied, “What are you doing in a poison shop? Much less Windward’s.”

Aventurine chuckled, regaining his posture. “Sunday ordered me for an assassination, so, I’m picking up something special for the job. Why? Do you have a problem with it?”

Ratio’s frown deepened, “You? Out of all people? Hmm..”

Aventurine's smile faded completely. "What do you want, Veritas? If you're here to interfere—"

"I'm here to make sure you don't make a mess of things," The doctor interrupted, his tone cold and firm. "You have a habit of being reckless and impudent, and this mission is too important to be botched by your usual antics."

Aventurine bit his bottom lip at the accusation, maintaining a sassy smile at the man’s usual bitchy mood, but before he could respond, Ratio grabbed his arm, pulling him deeper into the room. The force of the movement sent a few vials clinking against each other on the shelves. "Careful," Aventurine hissed, hitting his shoulder, "these things are fragile and expensive.”

Ratio didn't release his grip. Instead, he pushed Aventurine against one of the shelves, their faces inches apart as his minty and hot breath flowed on Aventurine’s face. "You listen to me," Ratio growled, his voice barely above a whisper. "This mission is critical. You need to be focused and precise. No distractions, no slip-ups. You got it, doll?”

Aventurine's breath hitched, his pulse quickening not just from the proximity but from the intensity in Ratio's eyes. "And what makes you think I'm not focused?" he challenged, though his voice was struggling to maintain its usual bravado.

Ratio's grip tightened, his eyes burning with a mixture of underhanded meaning and something else, something Aventurine couldn't quite place. "Because I know you," Ratio said, his voice softer but no less intense. "I know how you operate. And I'm not going to let you jeopardize this. You know the consequences if you get caught.”

For a moment, they stood there in a tantalizing silence, the tension between them obvious. Then, in a move that surprised even himself, Ratio leaned in and kissed Aventurine fiercely. The kiss was rough, urgent, a clash of dominance and need. Aventurine responded in kind, his hands gripping Ratio's coat as he kissed back with equal want.

They stumbled back into the deeper parts of the storage room, knocking over a few bottles and vials in their heated exchange. The sharp scent of spilled venom filled the air, mixing with the already tangy aroma. Ratio pushed Aventurine against the left wall, his long veiny hands roaming over Aventurine's body, exploring with a desperate hunger.

Aventurine moaned into the kiss, his own hands working to remove Ratio's coat and shirt, needing to feel the heat of his skin. The urgency of their actions left little room for thought; it was all raw instinct and desire. Ratio's mouth moved from Aventurine's lips to his neck, biting and sucking, leaving marks that would surely be visible later.

Aventurine's fingers found the hem of Ratio's shirt, tugging it up and over his head. He ran his hands over Ratio's chest, feeling the hard muscles beneath his fingers. Ratio's hands were equally busy, unbuttoning Aventurine's shirt and sliding it off his shoulders.

Their movements became a slutty dance, each trying to outdo the other in their passionate onslaught. Ratio's hands found their way to Aventurine's trousers, unzipping them and pushing them down. Aventurine gasped as Ratio's hand wrapped around him, stroking with a firm, practiced touch. The man’s minty breath returned to blow his earlobe, “You’re such a beautiful little thing under there, hm?” He hummed, directing what he was talking about by rubbing his thumb over Aventurine’s manhood. Ratio’s tone softened, replaced with a desire as he pressed their bodies together as tightly as he could.

"Veritas- ahh-…" Aventurine moaned, his voice filled with both plea and shyness. "Veri, please-."

Ratio raised an eyebrow at the sweet nickname, taking his hands off of the magenta-eyed man. He dropped to his knees, wasting no time in taking Aventurine into his mouth with a fervor that bordered on secret worship and possessiveness. Aventurine's hands tangled in Ratio's hair, guiding him, urging him on. The sensations were overwhelming, each one sending shivers of pleasure through Aventurine's body. He started to whine as his sore testicles became wet by Ratio’s spit, being attacked furiously by his desperate tongue.

Just as Aventurine was about to reach his peak, Ratio pulled away, standing up and pulling Aventurine into another searing and slobbery kiss. Their bodies pressed together, the friction almost too much to bear. Ratio turned Aventurine around, pressing him against the wall, and rubbed his thick and fat cock against the quenching entrance that was oh so needy. Ratio laughed slightly and wiped the spit coming from his bitch’s mouth with his thumb, licking the saliva off his finger and watching as Aventurine’s face erupted into a darker blush.

Aventurine moaned out, feeling something intruding and large abruptly enter inside him, his hands scrabbling for purchase on the cold, hard surface. Ratio moved with a relentless rhythm, each thrust sending waves of pleasure coursing through them both. The backroom echoed with the sounds of their love, the primal, obsessive need for each other driving them both to the edge. Ratio's hand reached around, stroking Aventurine in time with his thrusts. The double assault was too much; Aventurine came with a shuddering cry, his body tightening around Ratio. Ratio followed moments later, purposely pushing even deeper to release his hot seed deep into his bitch as he held him close and kissed his bare neck.

They stood there for a moment, panting and leaning against each other, the aftershocks of their encounter still rippling through their bodies. Ratio pulled out gently, wrapping his arms tightly around Aventurine, leaning down onto his soft skin and admiring his gorgeous curves. His eyes, once filled with annoyance and intensity, now held a softer, more tender expression. Which was unlike for an arrogant prick like him.

Ratio took in a deep inhale, “This changes nothing. And you dare not tell anyone.” He snarled, however his actions portrayed his words otherwise. He picked the more petite man up, pulling his pants up and buttoning his shirt back up. “We’ll get the vial tomorrow, you can stay at my chambers tonight.” He murmured on Aventurine’s trembling body, stroking it with hidden love.

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