#(prob the last 2k+ fic in awhile unless my time management is insanely good)

[suddencolds]

Untrustworthy | Genshin Impact

This is a 3k word commission for anon! (I admittedly wrote over the commissioned word count).

Thank you so much for commissioning me and for your kind message 😭This fic was surprisingly very challenging to write, so I’m sorry for the wait; I hope you enjoy! 

Requested prompt: 

I want Diluc completely miserable with a cold. As much mess as you're ok with. Still trying to function. Until Kaeya can't stand watching anymore and inserts himself as caregiver.

—

It’s subtle at first. Diluc turns away from making a drink to cough tightly into an elbow. Diluc’s gaze pulls uneven as he ducks forward with a barely stifled sneeze into a handkerchief he’s been keeping in his coat pocket. Diluc—when he thinks no one is watching—leans a bit too heavily against the countertop, bracing himself with one arm, and lifts the other hand to massage his temples. as if he’s attempting to drive away a headache that he’s had all afternoon.

It would be unnoticeable, except Kaeya pays more attention than people give him credit for. It would be unnoticeable, except Kaeya is aware that a cold has been making its rounds through the Knights, many of which frequent the tavern—one severe enough to prompt Jean to actually take a sick day, for once, one that seems especially severe this winter and—judging by the absences in his ranks this last week—difficult to avoid.

Diluc doesn’t fall ill often, Kaeya knows. Even now he barely looks unwell, save for the faint flush of his cheeks, the exhaustion disrupting his usually-perfect posture, the sneezes that he keeps stifling into almost-silence.

Either he’s at the start of his cold—before it’s had a chance to get really bad—or he’s putting in an inordinate amount of effort to hide it.

Kaeya suspects it might be both.

“Master Diluc,” he says, when Diluc conveniently stops by one of the tables next to him with drinks. “When does your shift end?”

Diluc’s shoulders stiffen, though he doesn’t turn around to address Kaeya properly. “Three hours from now.” he says, frowning. “if you intend to involve me in one of your late-night arrangements…”

“Oh? Not this time,“ Kaeya says. He lifts his wine to take a sip. “Even if I were, I think perhaps I would have reconsidered.”

“And why is that?”

Diluc says it flatly—unaffectedly—but he only has the luxury of keeping up that act for a few seconds before he’s ducking into his shoulder with a perfectly silenced stifle. It’s such a seamless performance, neatly contained and expertly quiet—really, Kaeya deems himself unworthy.

“Bless you,” he says, though Diluc scoffs, swipes the empty glasses from the table he’s serving, and starts off toward his usual spot behind the counter. “I do hope you are not falling ill, master Diluc.”

Diluc sets the glasses down on the countertop, diligently averting his glance. “I’m fine.”

“Is that so?” At Diluc’s silence, he presses on. “Perhaps you should close up early, just in case. You look like you could use some rest.”

“No need,” Diluc says. “It’s just— “Hiih… hiIIH-nGK-t! Hiih… HIiIH…-!!.... hiIIh-GKt!” The sneezes snap him forward, his shoulders trembling with the motion. He straightens with an almost imperceptible shiver. “—just dust, snf. Perhaps the Knights would be more efficient if you put more time into work instead of investigating less…” Diluc looks to him at last, his jaw tightly set. “...pressing matters.”

“Ah.” Kaeya laughs. “So eager to get rid of me?”

“Your concern is unnecessary. I already intend to close up earlier than usual.”

That’s surprising, to say the least—Diluc usually never cancels plans to suit himself. “So you really aren’t feeling well,” Kaeya says, suddenly worried. If it’s so bad that even Diluc is closing up early...

He must not be doing a good job keeping the concern off his face, because Diluc just scoffs dismissively, crossing his arms over his chest. “It’s not that.” He coughs softly into his raised elbow. “I have somewhere to be.”

“Hmm, to think you said no late night excursions...”

“There’s a banquet tomorrow that I’m expected to attend.”

And yet he won't be closing up for another few hours. And yet he’s here, with the start of a cold, looking exhausted and unwell, and still—for reasons Kaeya can’t fathom—he intends to work late into the night and then spend the entire day tomorrow at some pretentious social event. Kaeya knows that having to entertain strangers is exhausting to Diluc even on regular occasions. He also knows that whatever Diluc is coming down with is unlikely to resolve itself in just a night’s rest.

“For the winery?” he asks. “My, such impressive dedication to the business… surely you can send Elzer on your behalf?”

Diluc’s shoulders tense in a way that suggests that he is as reluctant about attending as Kaeya expected. “I can’t. The host requested my presence.”

“At the very least,” Kaeya says, “You should close up a bit earlier.” He glances over his shoulder to peer through the first floor windows. It’s dark outside—too dark to come to any conclusions, but earlier today, the sky had been too heavy, the air prickling with humidity, the clouds overhead sprawling and dark. “It wouldn’t do you any good to get caught up in the rain.”

“The rain is of no consequence to me,” Diluc says, in the kind of tone that suggests that he doesn’t intend to close up early at all.

“Even with a cold?” “I don’t have a cold.”

Kaeya shrugs.  “Well, if you’re certain.” He pushes his mug forward so that it rests on the countertop, right within Diluc’s reach, and counts the mora out beside it. “Goodnight, Diluc.”

He turns on his heels. Years ago, he might’ve stayed longer. He might’ve insisted for Diluc to take care of himself and not left his side until he had.

But it’s been years. Diluc left, and Kaeya tried to muster up the pieces of himself that had existed independent of him—he’d taught himself how to lie, tricked himself into believing that the person he’d trusted most hadn’t left him—and now even though Diluc is back, sometimes it feels as if Kaeya barely knows him at all.

If Diluc won’t take care of himself, then that’s his prerogative. It’s stopped being Kaeya’s problem a long time ago.

—

Kaeya has every intention of leaving Diluc alone.

That is, until he’s at the Knights’ headquarters, listening in on a conversation that he doesn’t quite mean to eavesdrop on but hasn’t gone out of his way not to avoid.

“He keeps taking our work,” one of the Knights says. “It’s awful. Last time we spent all our time finding this one domain—Fatui territory, alright? We had a whole expedition team ready to scout out the domain the next day. Then the next day, we get there and the place is abandoned. Everything’s been scorched. Must’ve been a pyro user.” “How do you know it was him?”

“Trust me, you’d know. How many pyro visions are there in Teyvat? It’s like the legends say. He doesn’t leave any room unturned. He’s more thorough than a team of our men put together.”

“Gentlemen,” Kaeya says loudly, smiling when they startle and turn to look at him in synchronicity. “What are you talking about?”

“The Darknight Hero,” one of the knights offers haltingly. “Last night he took down one of the Fatui strongholds we were planning to deal with. Talk about an annoyance, huh?”

“Oh? How heroic. It seems he lives up to his title,” Kaeya says. His mind is reeling. Diluc? But last night, Diluc had been working late. He’d gone home right after, hadn’t he? It wouldn’t make sense for him to be out last night. Unless, of course...

He would really, really like to believe that Diluc’s self-preservation instincts are better than that.

“I’ve been saying,” says another knight. “We were supposed to be scouting out the area right now. Chances are, there will be nothing left there that’s of any use to us.”

“Seeing as we have nothing to do today,” the first knight says, his expression hardening, “maybe we can conduct a search party for the Darknight Hero instead. See what he has to say about withholding information from the Knights.”

“Let’s not be too hasty here,” Kaeya cuts in, before the other Knights have a chance to offer their assent. “It’s unlikely that the Darknight Hero would be out during the day, isn’t it? Rest assured, I’ll make sure that it’s looked into. In the meantime, have you asked the Acting Grandmaster for a new assignment?”

The knight in question falters. “No, but…”

Kaeya smiles pointedly at him—the kind of vicious smile that, around knights and strangers alike, never fails to intimidate. “Then perhaps you should get to it, don’t you think?”

He waits until he’s sure they’ll be busy with something else. Maybe they’re mistaken. Maybe Diluc had gone to scout out the area on some previous occasion, and the Knights are only now paying witness to his usual efficiency.

Or maybe Diluc has forgone a night of rest in lieu of playing hero to Mondstadt in the pouring rain. And now he’s at a banquet somewhere, with a miserable cold that he’s most likely intent on telling himself he doesn’t have.

It’s been awhile since Kaeya’s been to a banquet. He misses the alcohol, the music, the extravagant decorations. It’s easy enough to tell himself that that’s the reason why he’s going.

—

It’s not difficult to get in. Kaeya is well-acquainted with having to sweet talk his way into lowering someone’s defenses.

Inside the banquet hall, it’s crowded. It is as pretentious a setup as it gets—visitors wearing suits and ballroom gowns, walls adorned with streamers and gold plaques, tables laid out with refreshments of all sorts. The building it’s being held in has at least two floors and too many side rooms to count.

He spots Diluc from across the room—red hair is rare enough that he’s not easy to miss. Diluc is currently engaging in conversation with someone Kaeya hasn’t seen before.

It’s likely that Diluc has found the person who explicitly requested his presence—probably someone with a business deal that he thinks warrants a personal talk with the owner of Dawn Winery. If Kaeya interrupts Diluc while he’s negotiating some sort of once-in-a-lifetime deal, Diluc will never let him live it down. So instead, he grabs a drink as an excuse to get closer and stands a few tables away to listen in.

Up close, Diluc’s cold is practically impossible to miss. His clothes look freshly ironed, but his hair is still damp at the tips—he’s changed into dry clothes, then, but his wet hair seems to only confirm the hypothesis that he was, in fact, scouting out domains last night in the rain instead of getting a wink of sleep. Diluc has always been pale, but now there’s a flush high on his cheeks that Kaeya thinks could only be a result of an impending fever. He is standing with his arms crossed—a last attempt to keep warm, perhaps—with a handkerchief gripped loosely in one hand. Faint shivers break the line of his shoulders.

Kaeya feels a pang in his chest. Diluc looks…

Kaeya watches as Diluc twists away with a soft apology and a wrenching sneeze that snaps him forward at the waist.

...miserable.

“That was merely my expectation,” the man says. “Crepus and I were business partners, do you know that? You don’t seem like the type of person who would choose this profession. I am sure your priorities lie elsewhere.”

Diluc clears his throat. “I have no qualms against upholding the family business.” His voice—though usually smooth and mellifluous—has taken on a rough edge to it, as if from overuse.

“Of course, I didn’t mean to suggest otherwise,” the man says. “I am sure you’re aware of your options, no? You could make a fortune selling off the winery if you so desired.”

“If you are...” Diluc starts, though his sentence is punctuated by a soft, desperate gasp, and he turns away just in time, ducking into his handkerchief. “hiIh…. Hiih… hiih’GKt—CHhiiew! Snf-!” His eyes stay shut in anticipation, the grip tightening around the handkerchief as his shoulders jerk with another sharp intake of breath.  “Hiih… Hiiih… Iiih’DZsshh-iu! haAHH’iIKTch-iIIew!” he sniffles wetly, barely suppressing a violent shiver.

“If you are here to gauge whether or not I intend to sell the winery, I can assure you that I do not,” he says, quieter than usual.

“Ah, of course, just a question.” The man leans forward, lowers his voice. “Truthfully, I am more interested in a partnership. It’s come to my attention that you have an excess of wine sitting in the winery’s cellars. If you can get me the amount of Dandelion Wine I need at a discounted price, I can sell it down in Liyue for a profit.”

“I have no interest in expanding the business any further,” Diluc says. “The excess will sell out easily in the spring when demand rises for Windblume.”

“I urge you to give it some consideration. Dandelion Wine is a specialty to Mondstadt. Think about the profitability of expanding to somewhere where dandelions are hard to come by,“ the man says. “You could stand to double or even triple the prices per bottle. I am only asking to take a fraction of your stock, see? Ten percent would be enough.”

He says it as if ten percent isn’t anything substantial, but Kaeya can’t help but think that there’s something wrong here—both with the presentation of the offer and with its suddenness. From here, Diluc’s expression is unreadable—it betrays only slight discomfort when he turns to the side, muffling harsh, forceful coughs into his suit sleeve, and murmurs a reflexive apology. No hesitation—not the slightest hint of wariness—even though the Diluc Kaeya remembers wouldn’t agree to raising prices so drastically without good reason.

“I can handle all transportation and deliver the profits to you in a few months,” the man presses on, interpreting Diluc’s untelling silence as interest. “My associates have done research on the market in Liyue and where it would be best to sell. You wouldn’t have to do anything differently from your end. All that I ask is for you to trust me with the first shipment and compensate me fairly after I handle the marketing and transportation.”

Diluc sniffles. “Forgive me,” he says, bracing himself with one hand against the table behind him as he ducks forward violently into a raised arm.  “hiIh’nGKT-chhiEW! HIih… I do n-not… hhH… Hiih-! hiIH’iiikT-CHhiew! Sdf-! Ugh… hiIIH’NGKT-CHhiew!” He leans slightly into his side, and though the gesture is well-disguised, Kaeya can tell just how much he’s bracing his weight on the table. It’s concerning, to say the least. Is he really too tired to stand upright? “...I do not expect to give out so much wine without a proper assessment of the risk. If you believe the model to be profitable, you are free to… t-to… hh-! to purchase…. hiIH… haAA’iiKTT-CHh!-u! hiIh’iiiTSSHhh’uh! snf-!” The congestion in his voice is evident in all of his consonants, and his gaze flickers down to his handkerchief in unspoken desperation, though Kaeya suspects he’s too polite to blow his nose in front of a business partner.

“...You are free to purchase wine at the same rate as I offer other corporate partners. I cannot - coughcough - I cannot offer such a large first-time shipment for free based on only an assumption that it will be successful.”

Kaeya can see the exact moment the smugness drops off of the man’s face. His eyes harden at Diluc’s hesitation, his practiced smile shifting into the approximation of a sneer.

“An assumption? You don’t trust my ability to see the operation through to the end?” He says, still in the same polite, haughty tone of his. “As a long-time associate of your father, I would have thought I would have earned your trust as well. Unless, of course, you simply don’t agree with Crepus’s assessments?”

Kaeya can see the way Diluc’s jaw tightens at the query. He clears his throat softly, though the brief wince that follows suggests that the action is far from painless.  

“His vision for the company is - snf - very important to me,” he says simply.

The man waves a flippant hand. “Or perhaps once he left, you decided you knew better? I mean, you have grown up so much, so I’m sure you feel more than capable of handling his affairs, regardless of whether or not you’re doing it his way. I don’t blame you.”

As the man turns around to pour himself a drink, Kaeya sees a flash of blue and gold tucked into his suit pocket. It takes him another moment to realize what it is.

A Fatui sergeant’s insignia—for identification purposes, or just a habit, likely.

This man isn’t a business partner of Crepus’s at all.

Now, the man wheels around, holding one drink in each hand. Alcohol, clearly—though it sparkles, faintly red. “Ah, well. I can’t say I’m not disappointed, but your decisions are understandable. A friend of mine has been working on a drink that mixes certain Liyuen specialties and Dandelion Wine—would you give it a try?”

“I don’t drink,” Diluc says haltingly.

“Just a sip wouldn’t hurt,” the man says, raising an eyebrow. “If you are anything like Crepus, you must have developed quite the refined taste when it comes to wine. Perhaps you could speak for the quality?”

“I’m sorry,” Diluc says quietly. “I am… Hiih… f-feeling… hH…. hiIih’iIKT-chHIew! Sdf!... slightly under the weather.” Kaeya blinks at him, disbelieving. Such an outright admission is practically unheard of, when it comes to Diluc—but then again, it’s a convenient excuse, and Kaeya is not under the impression that he really knows him. Diluc lifts a hand to his face, sniffling hard. “I’m afraid I would not be able to taste it.”

“You state the obvious,” the man drawls, and Diluc’s shoulders hunch slightly as he turns his face away, his cheeks reddening slightly. “Actually, that’s one of the reasons why I recommended this drink. It’s made with Jueyun chilis. Should be good for clearing up a cold.”

“Is that so?” Diluc says, still frowning.

“Perhaps you could speak to its efficacy?”

Slowly—hesitantly—Diluc lifts the glass. The man watches him like a hawk—too eagerly, if anything. Kaeya presumes that he either wants Diluc poisoned or too intoxicated not to be swayed, and hauling home a Diluc who can’t hold his own sounds like more than he’s signed up for, so now would be a good time to interfere. Diluc can be mad at him later.

Kaeya, for all he’s attempted over the years, has plenty of practice making his entrances as obnoxiously showy as possible.

“My, my,” he says, striding in with a drink in hand to settle right next to Diluc. “The esteemed owner of the Dawn Winery.” Just for the way Diluc grimaces at the title, his eyebrows furrowing, he decides this intervention has been worth it. “And… who’s this?”

Diluc veers away from Kaeya to stifle—a soft, near-silent stifle that must be exhausting to suppress.

“A business partner,” the man answers through gritted teeth.

“Must be a busy job,” Kaeya says, snatching Diluc’s drink out of his hand and setting it down on the table behind him. “Given, of course, that you have two.” He takes an efficient step forward and swipes the insignia out of the so-called business partner’s pocket.

“I do wonder why the Fatui would be so interested in the Dawn Winery,” he says calmly, ignoring the man’s indignant yelp of protest. He turns the insignia over in his hands, contemplative. “Did you really think the owner of the largest wine business in Mondstadt would be so easy to scam?”

The sergeant swears. “You asshole—!”

Kaeya reaches for the sword tucked into his belt. He knows it wouldn’t be a fair fight, seeing that the man seems very much unarmed, but it’s as good as anything as a threat. “I don’t suppose you’ll try this again?” he says. “I can’t claim to be the best swordsman in Mondstadt—that title goes to the previous cavalry captain, but maybe tonight I can come in second.”

“You can’t be serious.”

“Oh? Do you want to find out if I am?”

“No,” the agent says. “I wasn’t finished having my conversation.”

“Well, what a shame.” Kaeya doesn’t wait for him to think of a response. He takes Diluc’s arm and turns abruptly to haul Diluc towards the exit.

Diluc goes along easily enough. It’s only when they get outside that the frustration—from watching Diluc push himself, stubbornly, to this extent—boils over.

“Diluc,” he says, turning on his heels. “Really? After a late night shift at the tavern, your first thought was to forgo rest to spend all night scouting out a Fatui domain? In the rain, for that matter?”

Diluc turns away, his expression unchanging. “That’s not worth mentioning.”

“Perhaps you’d claim that attending a banquet directly afterwards is not worth mentioning, either? Your hair’s still wet. And that encounter with the Fatui sergeant—what’s gotten into you? Since when have you been so careless?”

He’s almost certain Diluc can hear the unspoken accusation behind it. This isn’t like you. Diluc is hasty—he has a tendency to overestimate himself and involve himself in situations he knows will be dangerous—but he isn’t careless.

“—I knew he wasn’t one of Crepus’s associates.” Diluc explains, with a soft, liquid sniffle. He turns away, lifting an arm to his face. “I would’ve - hhihH-!! - snf, I would’ve recognized him if he were, sdf.” his eyes drift shut; he buries his face into his suit sleeve, sniffling. “Crepus made it a point to… hiIh…-! hIIIh… to introduce him to everyone he - HIiIIih… sdf-!! ...Everyone he worked closely with.”

“Is that so?” Kaeya says, but it’s not enough. “Then why did you entertain him?”

Diluc is quiet for a moment. When Kaeya looks over, it’s to a dazed, bleary expression before he ducks harshly into his raised elbow with a forceful, “hiIh’nNGKT-chHIEw! hiIH’IITCHh-chhUU!! Snf-!”

He doesn’t lift his elbow from his face. “I w-wanted… snf-! more -  hiIh-!...information,” he says. “If I were to know more about what he was planning, it would make it easier for me to find any fraudulent - hiIih-!! Snf-! - transactions in the company’s history if I knew what to - hIih-hiIh’iIKTch-IIiu! Excuse me… snf-! -to look for.”

“Bless you. There are better ways to do that,” Kaeya says. “No need to do it when you’re evidently unwell.”

Diluc peeks out from behind his arm, which he still hasn’t lowered from his face. His face is flushed up to his ears—easy enough to dismiss as fever, though Kaeya knows that’s not all there is to it.

Diluc has always been embarrassed about admitting weakness. Kaeya sighs, fishes through his own pockets for a spare handkerchief.

“I have to say, Diluc,” he says, holding out the handkerchief — which Diluc accepts hurriedly, turning away to clean up whatever mess he’s made of his sleeve - “My weekends would be much less eventful -”

“hiiihh’GKTTt-CHh’yyew! snf-!”

“- if I could trust you to look after yourself,” Kaeya finishes, raising an eyebrow. “Bless you, by the way.”

“I know my limits,” Diluc says.

Kaeya huffs a sigh. “But you don’t honor them, do you?”

Diluc frowns, looking away. “I would have been fine if you hadn’t showed up.”

Kaeya stares at him. It’s half in disbelief, half in exasperation—but Diluc has always been like this, hasn’t he? Insistent on his own self-sufficiency. Hesitant to admit he might, in any way, be infallible.

I would’ve been fine.

“You always are,” he says finally, with a smile that he doesn’t mean.

If Diluc so diligently insists on refusing his help, perhaps Kaeya should take a hint. Mondstadt is a half hour away—less, if he hurries. He quickens his pace. It’s fortunate, he thinks, that the rain stopped early this morning, after—

Diluc grabs his arm.

Kaeya wheels around, suddenly worried that Diluc might be feeling much worse than he’d let on, but Diluc’s expression betrays nothing as he lowers his hand to his side.

“Thank you,” he says—a soft, private admission.

Kaeya clears his throat, waves a dismissive hand. “I assure you, I have plenty more handkerchiefs.”

“No,” Diluc says quietly, looking away. “Not just for that.”