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Jul 30, 2025

And it was all Yellow Chapter III (NSFW)

dividers by uzmachiato and batsydividers banner by me

viktorxfem!reader

Note: I know I said I wanted to do a slow burn but...he took a nibble. He was hungry. Excuse him. This is my first attempt at smut, and I was blushing writing it, so I hope it's somehow acceptable.

Warnings: Oral f!receiving, monster smut, weird anatomy

Word Count: 4,9k

CH. 1 | CH. 2 | CH. 3 | CH. 4 | CH. 5 AO3

How could he say no when she said his name like that? If he could flush with colour the way she did, he would. But now he’s holding a long appendage close to her skin, hesitating.

"I'm not sure about this. Is it safe?"

"Well, I did see people doing it before. Looked safe enough."

"Eh… fine. And I just put it in? Won't it hurt?"

"I think you may have to stab it in? You know," she gestured vaguely with her fingers, miming the motion, and he blinked with alternating eyes again.

"I don't see any hole."

"Give me—" she yanked the long appendage from his hands, earning a sharp hiss of air from him. "Careful."

"I am careful. Now let me just position it—" A pause. A few heartbeats later, he exhaled.

"Why did you stop?"

"I'm chickening out."

"But you said—"

"I can't. You do it?" She winced.

"I think—"

"Just stick it in!"

And so he did.

The pain was sharp but disappeared quickly, shifting into something entirely different: your chest rising and falling on its own as he breathed air into your lungs. You tried to hold the breath, but couldn't—it came too fast. You had to tell him to slow down, or you'd end up dizzy from the rush of oxygen.

"Marvellous," he said, staring at the place where you were joined, awe in his voice. "It actually works. It's brilliant! A natural way to adapt, a kind of symbiosis, perhaps? There must be a reason for this glorious evo—"

You chuckled. "It does feel strange, doesn’t it?"

"Ah… no. Not for me. There isn’t much change. I just have to breathe in more."

"Oh. Well, it’s definitely strange on this end of the tube."

You touched the gooey part where the tentacle-like appendage fused to your neck. The sticky substance sealed it shut, clean and airtight. He flicked your hand away.

"Don’t. It keeps everything in place. Better yet, keep your fingers away from it."

The connection was long enough to give you room to swim beside him if you wanted, but the more practical solution was to let him carry you.

He moved his hands to your waist. His claws pressed gently into the fabric, leaving slight indentations. Then he said your name softly. "Can I?"

When you nodded, he lifted you and pulled you to his chest. It was a strange feeling, being this close to an Undine underwater. Being held close by Viktor. He was all sleek muscle and wet skin, somehow different from yours: thicker, warmer. Near his navel, the body tapered into an iridescent yellow tail.

It was hard to hold on. He was so much larger than you, and you were trying to avoid brushing against his delicate fins. That left you in a rather compromising position: arms around his neck, face buried near his collarbone, legs wrapped around the beginning of his tail. If he were human, the position would be undeniably intimate.

"Hold tight," he said simply, keeping his hand at the small of your back, pressing you closer, and you swore that touch burned.

When he began to descend, slowly enough for you to adjust, you instinctively tried to hold your breath. But that was pointless. He was the one pumping air into your lungs. Keeping you alive.

He traced soothing circles across your back to calm you.

You only opened your eyes once you were fully submerged, letting them adjust to the seawater.

He was smiling.

And in the water, completely in his element—he looked even more beautiful. You kept your eyes closed for the rest of the journey, the image of him burned into your memory.

It was a large grotto. If you spoke, the echo would rise to the high ceiling, brush against it with its fingertips, and return to your ears, whispering your own words back at you.

When you finally forced yourself to open your eyes—previously clenched shut from the feel of his breath in your lungs, the shifting muscles beneath your thighs, his tail lashing to propel you forward—you blinked. It was bright. Surprisingly so. And as your hand touched the sand of the little beach he had deposited you on, you gasped. Each movement caused a ripple of cerulean light.

He dragged a claw across the wet surface and drew a circle. A flash of colour followed the line as it grew.

“Plankton,” he answered before you could ask.

In the depths of the sea where Beta City lay, there was no way to see them. That meant you must’ve been very close to the shore.

When his rib fins stirred and his tail lifted, the colour dragged with it. A flash of blue, then ripples sparkling down with the droplets, moved by his touch. You felt a strange kinship with the plankton. You too felt like a bolt of lightning passed through you every time he touched you.

“You always bring me to bright places.”

The corner of his mouth lifted ever so slightly.

“You don’t see as well as me in the dark, no?”

That was… awfully considerate of him.

You blinked again. Pupils shrinking to dots, taking in the glow. Yellow and blue swirled through the water, rippling outward from him—the brightest thing in the grotto full of blue. Little dots of yellow flickered around him like stars clinging to a night sky. His gills did their little dance again when you met his gaze, and the fins along his body lifted, making him appear larger.

“I see very well, thank you,” you said, trying to sound offended, but your eyes were still glued to the quiet spectacle in front of you. You noticed how the fins ruffled at the ends, how the light seemed to travel through them, and how delicate they looked, even though you’d felt how sturdy they were under your fingers.

He was the one to break the spell first. His fins smacked back down.

“This used to belong to your people.” A claw pointed behind you, and reluctantly, you turned to follow its arc.

Part of the grotto had collapsed, crushing a metal structure you instantly recognized. You’d lived in something just like it for most of your life.

“Is that… a research facility?”

“I honestly don’t know,” he said. “The place is warm, as long as you don’t go too far down the collapsed corridor. Maybe there’s something useful still in there.”

“How did you find it?” you asked, taking a few steps toward the structure. Light flared beneath your feet.

“Ah, I know a lot of places like this. But it’s far from shore. I couldn’t reach it alone, so I’m not sure what’s inside. But…” He hesitated as you poked your head through the half-cracked doors. “You can get dry here. And warm. Like you asked.”

You pulled your head back out and looked at him.

“Thank you. Really.”

He had to leave before he did something stupid.

The grotto had been abandoned ages ago, even before he was born, but he knew it was safe. His people didn’t come here often, as the narrow corridors were difficult for larger Undines to navigate, and the open spaces served no purpose. Besides, no one wanted to be near the metal box the humans had left behind.

It was a strange feeling. Having someone depend on him. He told himself it was only hunger. A hunger for knowledge, for the things she could tell him about her species. Maybe a bit of rebellion against Silco’s wishes. Maybe spite. Maybe curiosity. His part of the deal still wasn't fulfilled, after all.

Viktor was many things. Slow? Sure. Scrawny for an Undine? Also true. But he wasn’t a fool. He understood his biology—the pull he felt toward the human—and it unsettled him. He shouldn’t be thinking about mating with her if he didn’t even know whether they fit together. He shouldn’t feel thunder in his chest when she wrapped her tails around his tail, so close to the slit that hid what she knew nothing about.

The heat of her body, the sweet scent of her drifting through the water as he took in deep gulps—it made him feral.

Fuck biology.

It made him irrational, clouded his mind. He didn’t want to be a slave to his body, not when he was already hyper-aware of its limitations. He wouldn’t let it decide anything more for him. If he ever mated, it would be with a fellow Undine. And if that happened, it would be once. He was fairly certain he wouldn’t survive it.

And yet…yet the feeling persisted.

The spines along his back rose when the trail of goose bumps sparked under his skin and travelled all the way to the tips of his ribboned fins. He shook it off. Wretched thing.

Maybe it was that she didn’t look like she could tear him apart...and that was certainly appealing. But who knew if she didn’t hide a toxin in her dull claws? A spike somewhere that could kill him in seconds? He had no idea how humans mated, and he wasn’t going to ask. Admitting he’d thought about it would be humiliating.

Admitting he’d thought of her like that.

He wanted her to see him as he was: capable, perceptive, curious. Not just some animal obsessed with the idea of mating. Not something desperate to coil his tail around her soft, colourless body, to squeeze, to lick just once, to taste the source of that sweet scent—

Dammit.

He groaned, huffing out a stream of bubbles and startling the fish he’d been hunting.

Dammit.

He was already lost to it, wasn’t he? He was. Because he didn’t notice the flicker of blue watching him from the shadows.

You were glad he was gone.

You saw how his expression shifted when you were in the water, but you couldn’t tell why. You could feel how strong he was when his tail moved you here, when he pumped air into your lungs with such intensity it left you dizzy and lightheaded.

You pushed at the indented metal doors. Hollowed from the inside, they gave in fairly easily, though not without a bit of wiggling. The interior was dark, the floor slick with algae, but the hidden compartments in the walls looked intact. The base must have been abandoned when the cave corridor collapsed, hastily enough to leave behind anything but the essentials.

Click.

There was resistance when you pressed the button, like a grain of sand caught beneath it. A hiss of air followed by the clank of metal, doors falling from their hinges and landing just a smidge from your foot.

Bingo.

A thermal blanket. A medical kit. Outdated diving gear. Boxes of supplies and food. Upon inspection, the food was long expired, and you weren’t about to gamble on your stomach. The ceiling dripped steadily, so you began the gruelling task of hauling your findings outside, right under a stone alcove where the rock was dry and jutted out in a way that could function as a shelf. Or a bed, if you were desperate.

You managed to activate the emergency heat box. It produced fire without wood or coal—how, you didn’t know, but you were grateful. At least now you could dry your wetsuit.

You looked around. Viktor was gone. The grotto, lit with dim blue bioluminescence, was still captivating. You meant to explore it more closely, right after you peeled off your clothes.

Making sure you were alone, you reached for the zipper. A sharp, metallic grind echoed as cold air hit your back and—fuck—it was cold. You hated the feeling of salt drying on your skin, but there was no way to rinse off. The water pouches Viktor left were strictly for drinking.

You felt like a snake, shedding a second skin. You hissed as you peeled it off, seeing how red and irritated your skin had become beneath. The suit provided insulation, sure, but staying in one too long was not ideal.

Soon, you were wrapped in a blanket, crouched near the fire, trapping the heat under the thick material. It was blissfully hot, so much so that you had to take breaks just to cool off.

You even ate a few more sea grapes. Tried licking the oyster. Spat it out instantly. Not wanting to be disgusting, you discreetly pushed your failed experiment into a puddle.

Viktor wouldn’t know.

He found her skipping through puddles near the shore, making flashes of turquoise appear and disappear under her strange tails. She was just stepping, drawing lines in the sand, enjoying how it sprang to life, smiling.

His hearts twitched. He hated to ruin the moment, so he stayed in the water, watching.

She must have felt his gaze because she stopped and squinted, scanning the dark cave. He might be small for an Undine, but he was still a predator. She wouldn’t see him unless he wanted her to.

But he did want to. He’d brought her more food. His own belly was full, so he carried offerings: kelp, sea grapes, small shrimp. Hoping she might eat something more nutritious than greens like a manatee. He wanted to keep his human fed.

And though it hurt a little to admit, he already thought of her as his. He had come to terms with it.

“Human,” he called, finally surfacing, swimming closer to the shore.

Her smile spread across her face and crinkled her eyes, leaping from her to him. He felt it reach his own lips, pulling them upward into a matching expression. It felt good to be the cause of that.

“I brought you more food,” he said, suddenly self-conscious. Would she like it? Would she think it a meager offering?

But she looked at him instead, and he swore his hearts jumped when she said, “Thank you. That’s very kind.”

It wasn’t kind. It was just the bare minimum to keep her alive. She didn’t need to be grateful—he had taken her, held her here—

“I’m sorry,” he said.

She raised an eyebrow. “For?”

“For not giving you much choice. For keeping you here. For… well, essentially kidnapping you. I had a choice, and I made the wrong one.” He exhaled. “And I keep making wrong choices, and you’re the one paying for them. For that, I am sorry.”

All his fins had gone flat against his body. He truly felt remorseful. For the moment of weakness. For thinking Silco had a solution. For not asking the right questions. For dragging her into this.

Everyone must have been searching for her by now. Time was running out.

He knew he’d have to take her back soon. But still—he wanted to stretch the moment just a little longer. To talk with her. To feel her gaze on him. To see her eyes glitter with light, like they had when she saw his scales in the his cave.

“If you’re really sorry,” she said, leaning down to his eye level, bending her tails awkwardly, “and you want forgiveness… take me home.”

“Please,” she added softly.

He wanted to touch her cheek again. Just once. He would do anything she asked.

He had already made his decision. Still, it was hard to say.

“I will,” he said. “Let’s rest today. Tomorrow, I’ll take you home.”

His face was closer now. If she reached out—and oh, how he hoped she would—she could touch his gills again. Like a curious fry, he lingered, hoping for that small, gentle contact.

He could imagine himself begging for it. Just something to hold onto. A memory to tuck away inside the shiny shell of his mind, something to polish and revisit, like an opalescent pearl. But he didn’t ask. Of course he didn’t.

“Maybe you could have a look around?” she said. “Talk to Mira?”

She was closer now, and he could see the bare skin under her strange, loose coverings. His gills lifted slightly and fluttered.

“I’d… like that,” he nodded.

Then he tried the gesture she had shown him earlier—his thumb pointing upward. She giggled, and he felt proud for pulling that sound from her.

“I only wish…” he hesitated, more serious now, “you saw me for who I am. I’m not an animal. We’re not that different, humans and Undines. We speak. We think. We feel things.”

“I know,” she cut in, leaning forward. “I know you do. And I never saw you as one. I mean, yeah, you're a little scary—as a species—but… you’re kind. You’re considerate. And, well, I wish maybe if you visited the village… maybe stayed a while, we could talk more. Be friends, even. Like others do. There are lots of mated couples, sure, but also a lot of friends—”

“Mated… couples?” he repeated, blinking.

Her cheeks and ears flushed with colour. “Ah. Yeah. Mira, for example, she’s mated to Arges. They run the commune together. I know it sounds weird. Or gross, even — to you.”

She sighed. “But they made it work. They seem happy.”

His gills fluttered faster at that. If she had looked into the water behind him, she would’ve seen the faint lights flickering over his skin, responding unconsciously.

“Humans and Undines can mate?” His voice was quiet, hopeful.

He wanted to know everything. If there was a chance… If someone else had done it… Maybe what he felt wasn’t so strange. Maybe he wasn’t the off one.

“They… I hope you’re not asking me about the logistics,” she said quickly. “Because I don’t know. But from their frequent ventures into the kelp forest, I assume they can. And… that they enjoy it.”

She gulped.

He gulped.

A few fast blinks passed between them.

“How—”

“Don’t,” she warned.

“I want to know.”

“I don’t know.”

He huffed at her answer. Then after a pause:

“Do you… want to?”

The silence that followed.

It was either painfully long or you imagined it. Still, your face flushed, and your eyes darted to his lips. Did he just… proposition you?

He surely didn’t mean it like that. He was just asking. Just curious about humans. That was all.

“Uhm… I have no idea how Undines mate,” you said, deliberately using the word in its double meaning for his sake.

Undines couldn’t flush. His eyes were black, unreadable, and yet, you could tell he was nervous. The twitch of his fins gave him away.

“There is a mating ritual. And then…” he said softly. Luring you to come closer.

You were crouching on the shore; he was partially out of the water now. You could just lean in and kiss him, if you wanted.

And you did want to. But you stayed rooted to the spot, forgetting to breathe.

“What does it look like?”

“You… show your interest first. Present yourself, see if they’re interested.”

“Present? How?”

“You flutter your gills.”

“Oh.”

A beat.

Your hand itched to reach for them. They were moving now—fast, like ribbons in the wind, twirling beautifully.

A spectacle. For you.

“Like…” you gave in and reached out to touch. He’d let you before, but you hadn’t understood what it meant then. “…that?”

He exhaled and closed his eyes when your hand moved.

“Yes,” he breathed.

“And then?”

You ran your fingers through them like you would through hair, but gentle, without scratching. A minute passed.

“Then… if she accepts, she touches them.”

“…And then?”

“Then you’ve made an agreement. To mate.”

You could hear your pulse pounding in your ears. Thudding.

“And what happens next?”

Your faces were close now.

When he didn’t reply, lost in the sensation of your touch—you pinched the soft membrane again. He hissed.

“You hunt for her. And bring her a treasure.”

His voice was quiet.

You reached with your other hand, cupping the gills on the opposite side. His brow furrowed.

“And after you bring her a treasure?”

You didn’t move.

His eyes opened slowly.

His tail lashed out in annoyance.

“You coil together,” he said, like it was obvious.

“With your tails?”

He hummed.

“But not only… The mating frenzy takes over. There is equal pleasure and pain.”

A pause. “…If the female is larger, she can rip you apart.” You inhaled sharply.

Ran your fingers through, rewarding him for the reply. And then…he started to hum. A deep, resonant sound from somewhere in his chest, rippling the water around him, vibrating beneath your skin as you pulled and pinched and played to your heart’s content.

The scale was even—tilting from side to side—but no one dared tip it over.

You wanted him to tilt it. You wanted to tilt it yourself. Either way would be fine. Just a small push.

“Humans don’t have tails to coil. We don’t rip each other apart…” You leaned in, voice low.

“…unless we want to, of course.”

Two heartbeats.

“You don’t present?” he managed, eyes lidded lost in his pleasure.

“No. We kiss instead.”

A louder hum vibrated against you.

“What does it look like?” he echoed your earlier words.

“Do you… want to know?”

Your lips were close.

His gills fluttered so fast they blurred, his fins standing up. “Yes,” he breathed.

And finally—you pressed your lips to his.

He hesitated for a moment before lunging forward, pushing you down onto your back into the wet puddle. You let out a gasp as the cold seeped through the blanket, but then his mouth was on yours and you didn’t care. You bit his bottom lip, testing the waters, and with a soft sigh, he granted you entry.

He was careful at first, frustratingly so, avoiding his sharp teeth like he was afraid of hurting you. But then your tongue brushed his, and the sound that slipped from you was a moan, breathy and involuntary, swallowed into the kiss.

It wasn’t your imagination—it was long, ribbed, and slick, tasting you with greed like he wanted to consume you. A hiss escaped when he finally used his teeth, nipping your lip just enough to draw blood. He sighed when he tasted it, then licked it clean with deliberate, languid strokes.

Another moan followed, but you weren't sure who made it—when his tongue trailed down the column of your throat and you swore you felt a sudden suction at the underside of it. Hot and wet and strange, but not unpleasant.

“Viktor—” you hissed as he pressed you into the wet sand more, heavy against you, pinning you down. His kisses turned to bites, his lips dragging and sucking at your skin while your hands scrambled to anchor yourself. You tugged at his hair. “You’re crushing me. Please.”

He pulled back immediately.

“I’m sorry,” he rasped, fins drooping low. “I just wanted to taste you. I need to know where that sweet smell comes from.”

Your breath caught. “What smell?”

But he was already moving again, eyes darker set and on a target. His teeth tugged at the blanket clinging to your body, peeling you open like an oyster.

His gills fluttered as he breathed you in. “I can taste it in the water. I can taste you.”

Fuck. Okay, he could taste your…arousal?

He pushed you forward, the blanket falling away completely, exposing you fully to his gaze. There was a long pause—just a second—as he took in the sight of you. Then his tongue was back on you, trailing over your breasts, licking and sucking, exploring, while you clutched at his fins, his hair, anything you could. A moan escaped your lips when he nibbled at your nipple, and he seemed to like that sound, eager to chase it again

Soon, a claw pinched your breast as he coiled his tongue around the other. You wished you could press your thighs together. Anything for a little friction. Because he might not have known exactly what he was doing, but damn, he was eager.

You tugged at his hair, pulling a sound from deep in his throat. Then he moved lower — and lower still — scraping your flesh lightly with his teeth, until his fluttering gills tickled the insides of your thighs. They were soft and delicate, and felt like little licks. He hummed louder, the sound rumbling from his chest and vibrating against your skin.

Oh, and you could feel it — every bit of it — as he slid that ribbed tongue out and gave you the first tentative lick. You arched into him, your whole body lighting up.

“Is that alright?” he asked, unsure, pausing between your legs. You nodded vigorously. “Yes. Fuck—yes, it’s alright.”

Humming louder, he turned his attention back to his work. He flicked his tongue once. Twice. And then he slid it inside you. You could feel all those ridges twisting as he moved, and you tried to squirm away, surprised, but he gripped your ass and thighs with his claws, holding you firmly, pushing you toward him instead — deeper, onto his slick tongue.

Your whole body was seizing around the sensation of his touch. The noises he made were obscene. Paired with the hum vibrating from his chest, and you were already so close you could cry. But you didn’t want it to end. Not yet.

He worked fast, only to pull his tongue out and feast on you. Licking and sucking over your clit as the pleasure built and built, and your thighs clamped around his gills. You had to force yourself not to suffocate him, but it was so hard to think straight — especially when he pushed his tongue back in, searching… until he found the perfect spot and you moaned his name, clawing at his shoulders.

His tail lashed behind him as he seemed to search for friction on the wet sands of the shore, the bioluminescent plankton flashing with every movement of your bodies.

“Yes, yes, right there,” you gasped, grabbing onto his hair, riding his long, thick tongue as it plunged in and out of you.

And he was moaning too, savouring you like a fine meal.

You didn’t know what was louder now, the wet sounds, the humming, your moans, or the thudding of your own pulse.

And then he twisted his tongue and—fuck. You felt that suction again, like you had before on your neck, but this time inside you. You could’ve sworn you went blind for a moment, muscles seizing, thighs pressing against his head, squeezing tight around his tongue as you came.

You felt like molten metal, heated to the brink and liquefied over him, slumping down onto the sand, reshaped by the aftershocks as he kept licking, slower now.

You had to push his head up to look at you. He raised a brow, watching you go limp in his arms.

“That’s… give me five seconds,” you panted, throat raw.

He braced himself up, pulling that ridiculously long tongue back into his mouth, only stopping to lick his lips with a smug grin.

“Found it.”

“I don’t think I can move yet,” you said, gathering your thoughts afterward.

How were you supposed to go back to human men after that? No, you decided you were forever ruined and would never again enjoy what your own species had to offer.

There was a pause as you collected yourself, but soon enough, you were cradling his face in your hands, kissing him again. “Let me return the favour,” you murmured between kisses, breathless. But he pulled away.

“Can’t,” he said, shaking his head. “I haven’t brought you a treasure yet.”

What?

“Fuck the treasure. I don’t need it,” you whispered, sliding your tongue against his gills. He hissed in response.

“It’s not how it goes for my people,” he said. “It feels wrong otherwise.”

“You’re my treasure. That’s enough,” you said, kissing his neck, but he held you back, gently but firmly.

“Can’t,” he repeated, his fins drooping, the hum in his chest going still. “I’d like to do it properly.”

“Then let’s go find something,” you offered, brushing your fingers against his cheek. “And come back here, so I can take care of you too”

He should have been more careful.

When they joined by the breathing tentacle and swam away, he was still covered in her scent. It clung to his scales, and he wore it proudly, still buzzing with what they had done in the grotto. He couldn’t have been happier when she asked to look for treasure together, just so they could stop from time to time and do that kissing thing her people did — something he already adored.

He couldn’t wait for the promised later, for her soft caresses that didn’t hurt, didn’t try to tear him apart like a female of his own species might. Even her pulling at his hair had been more pleasurable than painful, and he’d wanted to laugh at her feeble attempts to scratch his thick skin.

He should have been more careful when they searched the corals, looking for a pearl, the one he had in mind was rare, pink, the kind he hoped to gift to a chosen mate.

He should have been careful.

It happened so fast.

“Sorry, mister. It’s nothing personal,” he heard.

Then came a sharp pain, and he saw the black of his own blood spill before collapsing onto the seafloor, dragging her down with him. Oh no, he thought.

She would surely drown if he stopped breathing.

But he was so tired now.

He sank, his tail ribboning behind him. She screamed. He felt the tube yanked violently from her neck. He wanted to scream back — to tell her she needed it — but his voice was gone.

He saw her limbs thrashing against Jinx’s blue body, her hands clutching at her throat—

And then he saw nothing at all.

#arcane fanfic #arcane #viktor x reader #viktor x reader smut #merman au #Mer!Vik #is it weird? or not weird enough?#deep waters #and it was all yellow

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