Chapter Text
“Thank you,” Naruto mutters, letting Sasuke drag him down into a system of trenches. He can’t see very well here, so he relies on Sasuke to guide him safely through the overwhelming darkness.
He feels a squeeze in his hand, and knows that Sasuke heard him. The heat of Naruto’s body is unpleasant, but as they travel into deeper water he cools down, and he’s hit with a sudden gratefulness that things have happened so fast. Despite the events leading up to this moment, Naruto feels safe in Sasuke’s presence, and he knows that he will be well cared for.
It doesn’t take very long for them to reach the large cave that Sasuke has chosen to nest in. Naruto blinks away the blurriness at the edges of his vision, amazed to see that the entrance is lined with glowing rocks.
“These are all over my village at home. There are typically many different colors, but I could only find one kind here.” Sasuke releases his hand, and Naruto can see him clearly in the soft yellow glow. He gestures inside, and Naruto swallows, knowing that once he passes the threshold, his life will never be the same.
Something in his gut urges him to enter, so with a swallow and a tentative swish of his tail, he glides inside, following the path of lights until he reaches a sizable cavern. It’s decorated and organized with many tufts of moss and glowing stones, portraying a sense of homely comfort only the safety of enclosed rock can provide.
“Oh,” Naruto breathes, gawking in awe. He doesn’t remember the last time he’d been able to tuck himself away in a cave. It’s too dangerous for him to enter the trenches alone, and before he’d never dare let the reef out of his sight under any circumstance, lest he test fate. But now, hidden away from the open ocean…
“Is it to your liking?” Sasuke asks, setting the shark meat in a wide woven basket off to the side.
Naruto nods, watching with anticipation as Sasuke slowly swims across the cave, collecting some seaweed hanging from a small, hooked ledge.
“Would you like to sit?”
Naruto nods again, and settles on a seat of spongy moss. He exhales, feeling the heat in his body continue to rise.
“I can smell your cycle,” Sasuke admits, turning to gather up a small chunk of meat. “You are almost at the height of your fertility for the season. Do you know how long it will last?”
Naruto bites his lip, shifting his tail at the fresh wave of longing pulsing through his core. “A few hours, at most. But I don’t understand why it’s coming on so fast. I thought it would take at least two more days.”
Sasuke hums, slipping the red flesh into his mouth and chewing thoughtfully. He offers some to Naruto, but he declines, sitting in silence as Sasuke begins to wrap the hunks of meat in the thick seaweed.
After Sasuke swallows, he chuckles, smiling at Naruto somewhat remorsefully.
“That would be my fault. It appears your body sees me as a suitable mate. It can sense my proximity, and I believe that the recent excitement may have assisted in setting off your cycle earlier than usual. I cannot say that I am apologetic, as I am more than eager.”
Naruto gulps, shifting slightly as a blush fills his cheeks. “Oh. That’s…I didn’t know that was possible.”
Sasuke takes another bite of meat, considering Naruto with comprehension in his eyes. After he’s finished wrapping up the last of their meal, he speaks plainly, so Naruto has no choice but to understand exactly what his intentions are.
“I know that we have not known each other long, but please do not feel scared of me. I will never harm you in any way and you and our pups will never hunger.” A frown forms upon his lips, and he adds on one more thing, just for good measure.
“I intend to keep you, for as long as I am alive.”
Naruto’s eyes track Sasuke as he settles across from him, golden light shimmering off his scales in muted color. “I…understand.”
“Do you?” Sasuke questions him, not unkindly. “We would leave these waters and venture back to my village. Is that something you are okay with?”
“You want me…to return to your home with you?”
“Yes. It will be safest with my family.”
Naruto looks down at his bare chest, then pointedly at Sasuke’s scale-coated one. Sasuke chuckles, reaching out to trace a finger in between Naruto’s soft pecs. Naruto shudders at the feel of that careful claw, so dangerous yet so gentle as it slides across his skin.
“Your kind is special. You adapt to your environment.”
Unconvinced, Naruto eyes him, struggling to ignore the flare of heat in his belly. “How do you know this?”
Sasuke hums, going about the den to straighten things as he talks. Nothing needs to be straightened, at least to Naruto’s eyes, so he knows Sasuke’s only giving him a bit of space to process. And perhaps calm his own restlessness, judging by the twitching flick of his sharp, black tail.
“I grew up with those like you. Blue-fins were once a pod near us, but they left with the red-fins to tropical waters many years ago. I knew I wanted to mate with either pod, and so I came to warmer waters to find them. And look,” Sasuke comes back to him, smiling knowingly. “I found the most beautiful one.”
Naruto flushes, finally letting Sasuke drag him over to the bed he’s crafted in the back of the cave. He doesn’t know if that’s all there is to Sasuke’s words, but the sentiment is nice. There are more like him out there in the great big blue!
Sasuke rests a hand on his waist, where the scales meet skin, and Naruto shivers, feeling his vent heat and slicken despite his initial hesitance. It’s a little daunting, knowing that a merman as fierce as Sasuke will sire his young. Not just once, but for the rest of his life.
“Come,” Sasuke gathers him up, guiding him down onto the soft bed of sea grass. “Have you ever mated before?”
Naruto gulps, his chest and neck flushing under the glow of the light stones. “No. Have you?”
Sasuke’s pupils dilate, and Naruto notices that his eyes are tinged red again. “No. I will go slow.”
Naruto nods, laying back stiffly. Sasuke pulls something soft over, lifting Naruto’s head to place it under him. It's spongy and comfortable, and Naruto appreciates the care Sasuke is taking to help him relax.
“Are you sure you would not like to eat first?”
Naruto considers it. “No. Maybe…after?”
Sasuke hums, crawling over Naruto. “Right to it, then?”
Naruto nods, tensing again.
Sasuke rests his weight atop him, pinning Naruto down to the bed. It doesn’t feel restrictive, and Sasuke keeps his earlier promise of going slow, connecting his mouth with Naruto’s gently.
His mouth is firm and warm, sliding against Naruto’s with intention. His gills flutter, and Sasuke pulls away from his lips to kiss down his jaw, licking over the thin openings on his neck. Naruto gasps, his tail curling around Sasuke’s in pleasure. Heat creeps lower, practically bursting from his needy slit, and his body reacts outwardly by pushing his prehensile member free of its sheath.
“That feels nice,” Naruto encourages, leaning up into Sasuke’s insistent tongue. Their bodies roll together, and Sasuke’s cock releases slowly, pressing and sliding against Naruto’s slightly smaller member. Naruto grips Sasuke’s biceps tight, undulating his hips, completely lost in the new sensation.
Sasuke’s penis is thick at the base and tapered at the tip, long, flexible and very active. It twists and wriggles, reflecting Sasuke’s eagerness.
Naruto gasps when it flicks against his breeding vent, shivering as it slowly worms its way inside him. It rubs and squirms against his sensitive walls, drawing a moan out of his open mouth.
“Good?” Sasuke inquires, even though he can clearly see how pleased Naruto is.
“Yes!”
Sasuke pushes his hips forward, his member inching deeper until he’s fully settled inside. He pauses for a moment, checking Naruto over. He smiles at Sasuke’s attention, and nuzzles their noses together happily.
Sasuke grins and pulls back, swirling around the edge of Naruto’s open hole. Naruto’s core pulses with want and need, knowing a virile male is ready to seed it. He grunts as Sasuke slips back inside, this time keeping his hips still and allowing his eager cock to do all the work. Naruto shivers and squirms in Sasuke’s grasp, slightly nervous as the prehensile member continues to pet at his constricting walls.
Typically, mating is quick and hurried, due to the nature of living in a place where danger lurks around every corner. But Sasuke’s kind must be very different, because he continues to allow his member to penetrate Naruto for an extended period of time.
Sasuke’s tip presses deep, sliding up and inside his womb. Naruto gasps and flinches at the sudden pleasure, clenching around the intruding penetration. “What are you doing?”
“I’m filling you up with my seed. To hold the eggs.”
Naruto supposes that makes sense, although he’s pretty sure his eggs are already nestled in place with the fluid his own body makes. He waits patiently as the jelly-like substance fills him, enjoying the way Sasuke shifts and sighs. It clearly feels good for him, and Naruto finds himself clenching repeatedly, reveling in the new sensation and watching Sasuke’s pleased expression above him.
Once Sasuke withdraws, another thicker and flat ended member extends from Sasuke’s tail, much larger and firmer than the other. Confused and slightly frightened, Naruto pulls away with a frown. This cock is very different from what he expected, and it clearly has a different purpose than seeding him!
When it dawns on him, Naruto can’t help his protest. “I already have eggs!”
Sasuke blinks down at him, watching Naruto struggle to stay collected. Big blue eyes look up at him imploringly, and with a stuttered, short breath Naruto says, “So…just fertilize mine.”
Sasuke hums, somewhat amused despite his concern. “Are you scared of it?”
Naruto squawks and hits Sasuke’s shoulder, still trying to shuffle away. “I don’t understand the need if I already have my own!”
“We’ll seed both.”
Naruto stares in disbelief. “It’ll be too much!”
“It won’t,” Sasuke assures him, pressing down. “Some will not be viable, and the eggs that do get seeded will absorb the others. It provides nutrients for them.”
Naruto looks down at Sasuke’s menacing length, frowning. “So you’re saying that some of your eggs are just…food for the unborn pups?”
Sasuke nods, sliding the thick cock along Naruto’s slit. The other, wiggly member has retracted, and Naruto already misses it. Why couldn’t the smaller one do both jobs?!
“It makes them strong,” Sasuke assures him, big hands grabbing his hips as he pushes forward, anxious to slip inside. “Yours too.”
Naruto bites his lip, looking into Sasuke’s earnest eyes. After a bit of deliberation, Naruto nods, agreeing. He trusts Sasuke, and surely they're compatible if his body sent Naruto straight into his breeding cycle…?
Sasuke smiles at him, caressing his cheek. “You have nothing to worry about. I know it’s common for merfolk in tropical waters to have multiple children, but my kin and I are different. We typically only have one to two pups.”
Naruto immediately relaxes. “What about my kind?”
Sasuke circles his hips, teasing Naruto’s entrance with his member. “Hardly ever more than one, from what I can recall.”
Naruto swallows and gasps at the deliberate motion. “Okay.”
Sasuke kisses him once more, a small, reassuring press of lips, then makes his move.
He slots their hips together slowly, holding himself aloft with his hands on either side of Naruto’s head. The angled tip of the ovipositor catches on Naruto's pulsing vent, then slips past the rim, parting him roughly. Sasuke winces at the sudden pressure, and Naruto cries out as he’s filled suddenly and near-painfully.
“I’m sorry,” Sasuke shushes him, caressing his hair. Naruto swallows and sighs, shifting his hips to try and ease the ache. Sasuke stays still for as long as possible, but eventually he settles down, shaking his hips to press further into Naruto’s body.
With a flinch, Naruto inhales, clutching Sasuke’s shoulders tightly. The flat head presses up against his eager womb, and he knows that both holes are aligning to allow the eggs entry into his deepest and most hidden space.
Brushing some of Naruto’s golden hair from his face, Sasuke leans in to mash grateful kisses into the side of his cheek and jaw. Naruto relaxes into the touch, enjoying the words exiting Sasuke’s mouth in a steady rush.
“Look at you, letting me so deep inside. Such a good mate. I’ll have you pupped and full of me in no time—”
Naruto groans and arches his back as Sasuke’s member expands and bulges, eggs sliding down the tube and exiting his penis— forcing their way into Naruto’s thankfully pliant, fluid-filled womb. He can tell that the first member inserted helped to loosen him considerably, and the pain quickly fades to blinding pleasure.
Naruto shakes and moans, feeling split open wide. He clenches hard when the first egg breaches him, his own cock pulsing and spewing fluid as he comes around the forceful intrusion. “O-oh, Sasuke!”
“That’s it,” Sasuke coos, grinding slow and deep, his eyes shutting and rolling under his lids. Naruto feels incredible wrapped around his swollen ovipositor. “You’re doing good.”
Naruto preens under the praise, only slightly embarrassed by his sudden orgasm. His seed floats above his belly innocently, and he can’t stop himself from batting it away.
Sasuke laughs breathlessly, another egg bullying its way into Naruto’s womb. Naruto flinches and tenses, bracing for the next egg.
“Relax,” Sasuke soothes, gripping Naruto’s twisting member. “Here, you can pleasure yours, too.”
Naruto watches in shock as Sasuke guides Naruto’s cock into his body, allowing it to slip inside next to the base of his own. Sasuke shuts his eyes in bliss, clearly enjoying the twisting tentacle squirming excitedly inside him.
“Oh,” Naruto pants, pulsing around the third egg as it drops within his core. His belly feels a little heavy now, and there’s a pleasant buzz under his skin. The heat around his cock feels delightful, and the thought of Sasuke, a powerful male, enjoying penetration?
Naruto comes again, silent and hard, his eyes slamming shut with the force of it. Sasuke moans and shoves forward, pressing the tip even deeper—
“Oh!” Naruto squirms and gasps, clutching onto Sasuke tighter, nails digging into the scales on his biceps. “There, keep it right there!”
Sasuke rolls his hips, tail slashing wildly behind him. He licks over the sharp teeth in his mouth, then leans in to nibble at the edges of Naruto’s fluttering pink gills.
“Ah! Yes!”
Naruto pants in bliss as egg after egg presses into his body, forcing the wave to crest once more in a simmering, full body orgasm that finally has him limp in Sasuke’s hold. He lays on the bed of seaweed made for him, and stares up into the swirling red of Sasuke’s pleased eyes that watch him tremble and take, take, take…
Eventually, Sasuke stills and sighs, and Naruto knows instantly that he’s been completely filled with everything Sasuke has. So very slowly, Sasuke’s member stops pulsing, and Naruto’s softened cock retracts as he pulls back. The flat-ended ovipositor slips back into Sasuke’s body, looking floppy and drained as it goes. Naruto almost wants to laugh.
He really did take it all.
Sasuke smiles widely, a look of pure adoration in his eyes.
“Stunning,” he mumbles, crawling down Naruto’s body to pet his mate’s swollen belly. Naruto just watches him, not quite believing what has transpired.
He’s bred.
“We will wait a few days,” Sasuke tells him, hand clutching Naruto’s to bring it over the distended skin. “The unfertilized eggs will dissolve, then it will be easier for you to swim. It will be a long journey.”
Naruto blinks and rubs his stomach slowly, feeling each little bump nestled within him. He feels floaty, like he’s living in a dream he’d never thought would be real.
“Sasuke…” Tears swim in his blue eyes, disappearing within the water around them. “Thank you.”
Sasuke appears above him, claws running down the side of Naruto’s cheek, making him shiver. He plants a gentle kiss at the corner of Naruto’s mouth.
“It is I who should be thanking you.”
Sasuke tucks himself into Naruto’s side, large hand resting protectively over their progeny. “Rest now, you will need it.”
Naruto sniffs once, then leans into Sasuke’s body, resting his head on his warm, scaled chest, and relaxing into the protective tail that curls around him.
🌊🌔