Depths
Sea Serpent!Obanai x AFAB!Mermaid!Reader
Content Warnings: MDNI, thalassophobia, nyctophobia, manga spoilers if you squint, sexual content, monsterfuck!ng, penetrative sex, consensual sex, oral sex (m! and f! receiving), 69’ing, tongue-fucking (Obanai has a really long tongue), bondage (via Obanai’s tail), light choking(?), sensory deprivation (it’s dark and reader can't see things unless they’re close by), degradation (reader-receiving), self-degradation (Obanai), breeding k!nk, creamp!e, mentions of exhibitionism (doesn’t really happen), uh- reader almost swims back home naked(?), minors and ageless blogs DNI!!!
Summary: Your father had always warned you of the dangers of the deep ocean, demanding that you stay within the safe borders of the underwater kingdom. However, one day, you become curious and secretly travel into waters untraversed by any merperson still alive today – wishing to know what lies beyond the safe confines of your home, not realizing that the countless warnings from your father had been given to you for very good reason.
Word Count: ~2.8k
Divider Credit: the wonderful @/benkeibear
Whatever you do, please, for the love of Poseidon himself, do not go past the borders of the kingdom.
Whenever you left your family’s underwater cave, your father would always warn you of the dangers of leaving the safety of your home. It was, of course, something every merperson was warned about: to not travel into the depths of the ocean, or so much as pass the coral reef that bordered the edges of the region.
For every single merperson that disobeyed this rule disappeared without a trace.
You were unsure whether or not that meant they’d died, but it seemed that was the general consensus of the merfolk in your community. Even the king himself decided to create gravesites for those lost to the depths, as a way to commemorate their memory and contributions to the kingdom. What’s more is that the royal family decided to keep guards posted at the edges of the reef in order to prevent anything from coming in, as well as anyone from going out.
Most merfolk heeded these warnings without question – as the pressure of the water would have killed them anyway should they have traversed a little too deep. However, you – always the curious one – wondered what exactly happened to those who did decide to enter the endless blue and swim into the dark. While the others considered them to be foolish individuals, you thought them to be brave, courageous adventurers who wished to know more about what existed beyond the borders of your home.
But, in order to not upset your father – you couldn’t bear being the cause of his misery and grief – you stayed put. Always looking but never acting upon your desires.
And so you performed your usual daily tasks, collecting sea grass and other marine vegetation as food for your family. You’d swim along the coral reef, not going so far as to reach the outskirts of the kingdom; yet, just as you were about to pluck yet another piece of kelp from its roots, a dark shadow crossed over you from above.
By the time you turned around to see what it was, however, the shadow was gone – it had, like those who’d gone beyond the reef, disappeared without a trace.
You never considered yourself to be foolish, but even little merchildren who spoke excitedly about the mysteries of the ocean depths would question the actions you performed next as you tossed your little woven basket filled with vegetation to the side and swam to the edge of the kingdom, hoping to catch sight of whatever creature caused the shadow.
As you swam to the very edge of the reef, miraculously evading any guards posted in the area, you looked out into the deep blue as it turned to black beneath your tail – never having realized before that your reef had stood on the edge of a precipice that overlooked a vast, endless abyss – unknowing and shrouded in mystery. You shivered, an indecisive feeling striking at your heart as you questioned whether or not to follow it – before you noticed the slightest movement in the dark below.
Fuck it, you thought to yourself as you embraced the vastness of the water and swam into the depths where light began to dwindle, wishing to know what exactly lived down there. You swam, and swam, and swam – feeling the pressure slowly but surely digging into your skin – a force that, despite the small discomfort, seemed to be pushing you further downward rather than ushering you back to the safety of your home, and a sense of freedom started to flood through you – because you had done something that was unthinkable, and you were alive.
Yet, as you continued your journey into the abyss, you noticed movement just out of the periphery of your slowly diminishing vision, and you realized how what you’d done could be perceived as foolish – because you were not alone here; there were beings lurking in the dark that engulfed you – watching you as you traversed through the unknown – or at least, what was unknown to you.
“You’re an interesting little thing, aren’t you?” a voice from behind you hissed. “Not a care in the world for what could be lurking within the shadows – stalking their prey as you go about swimming in waters that aren’t yours."
Your blood turned to ice as you slowly turned around to face the voice’s owner – only to find nothing as you’d gone too deep into the dark, just barely able to make out the tips of your fingers as you stretched your arms out in front of you. The voice chuckled, as though it could smell your fear.
“Where– where are you? Who are you?” you hesitantly asked the voice, only for it to answer – sounding from your right this time.
“Hm? So demanding,” the voice admonished you, “I should ask you what you’re doing in my waters.” It was behind you now, “tell me, how did you find yourself so far away from your home? Are you lost? Or, perhaps you came here – came to me – on purpose…” it drawled, and you felt an uncomfortable shiver move up your spine.
“I–” you swallowed, trying to ease the developing knot inside your throat, “I came here on purpose…I wanted to explore– I was curious of what lived beyond the reef.”
The voice hummed, “I can’t tell if you’re incredibly brave or insurmountably stupid.” It was in front of you this time, and you could just barely make out the silhouette of its figure before it shrouded itself in darkness once more.
“Can I– can I see you? I’d like to know who I’m talking to,” you insisted, trying to calm the shakiness of your voice.
You were met with silence – had the creature left you? Were you alone again?
“Surely a thing as pretty as you would regret looking upon something as hideous as I,” it responded, nearly emotionless – as though it were stating a fact of nature itself. “Why don’t you swim home, hm? I’d spare your life just this once – next time, I won’t be so forgiving.”
Yet, when you were met with such an offer, you hesitated. Something in which the words were said made you wonder if there was truly an escape from this.
“What if I refused?” You were beginning to realize how foolish you truly were. “I’m not leaving until I know who you are,” you maintained, and the creature scoffed.
“You merfolk have always been brainless,” it sighed, “I shouldn’t have expected anything different from you.”
“Don’t talk about my people that way,” you demanded, and you were met with what could only be described as a low growl.
“Why shouldn’t I? It was your people who cast me out years ago – who left me to rot in the depths beneath the reef… fucking pitiful, isn’t it?” the voice spat, “you wanted to see me? Surely you’ll understand why they did such a thing when I look like this,” it seethed as it finally got close enough to reveal itself to you.
At first, his outline suggested that he was a fellow merperson, but your eyes widened as he got closer – as he revealed his more reptilian nature. To start, he lacked the forked caudal fin usually possessed by merfolk, instead possessing one more pointed and snake-like – one that merged into a spinal fin that ran continuously along his much longer tail and back. Your eyes ran up his torso, which was scaly and muted in color like the rest of his underside. You looked at his arms, which were surprisingly one of the more mer-like parts of his body – until you gazed upon his hands, which were webbed in between his fingers, and with nails so sharp they could easily slice open the throat of any prey. Last was his face – again, similar to that of a merperson, but his ears were finned and his mouth was wide and serpent-like – almost as if it were cut open along the sides. Your eyes scanned down his body once more until– oh.
His cock was huge.
Embarrassment caused heat to prickle across your cheeks, since merpeople in your kingdom would usually wear loincloths made of kelp to cover themselves in public. You forced your gaze away from his lower half, only to see him glaring at you as you looked up towards his face and into his mismatched irises.
Yet, you didn’t display any emotion of disgust or fear upon seeing him, a reaction which very much confused the serpent before you, as all others before you treated him as though he were the algae stuck to their scales – or worse, something that needed to be killed off, as though he were no better than a barracuda threatening the young merchildren that played along the reef.
“Why do you not cower in fear? Why do you not try to escape?” He asked as you maintained eye contact with him, a pregnant pause ensuing between the two of you.
“Is there a reason I should be afraid?” you asked, and he frowned.
“A horrifying creature such as I should invoke fear, disgust even. Tell me, dear,” he mocked, “tell me how sickening you think I am,” he demanded, bearing his pointed teeth.
“You’re beautiful.”
He paused, unbelieving of the words that floated across your tongue and through your lips.
“Liar.”
You shook your head, “let me prove it to you,” you suggested, drawing closer to him within the darkened abyss, “may I ask for your name?”
The serpent looked at you with suspicion before conceding to your request. “Obanai Iguro,” he stated.
“Obanai…” You let the name roll off your tongue, fingers lightly tracing along the scales of his chest, causing him to tense slightly, “such a pretty name.”
He grabbed your wrist with his webbed hand in warning, his grip tight against your skin.
“I’ll break you,” he cautioned, and you smiled, using your free hand to drag the tips of your fingers along his scaled torso.
“Maybe I want to be broken,” you purred.
As though something snapped within him, Obanai coiled his tail around you, effectively trapping you in place, with his narrow caudal fin lightly constricting around your throat. He pushed you against the rocky surface of the underwater massif and met you at eye level, faces mere inches apart from each other before he clashed his mouth with yours, his fangs prickling against your lips as he kissed you fervently.
“You want me to break you? I’ll fucking ruin you, dear.”
Obanai gripped your jaw and forced his tongue into your mouth, making you quickly realize its forked nature as he massaged your tongue. He ripped his lips away from yours before moving down towards your breasts, grabbing at the shells that covered them with his sharpened nails and allowing them to fall into the darkness below. He latched his widened lips to one of your nipples, his forked tongue flicking the hardening bud as he sucked your breast into his mouth.
“Fuck– so good,” you whimpered, and he hummed before providing similar attention to your other breast, his tail tightening ever so slowly around your body – as though constricting around his prey in order to obtain his next meal.
And a meal you were, as he used his tail to force you further upward until his face was just below your navel, using his teeth to rip away the cloth adorning your waist as though he were haphazardly unwrapping a present. He wasted absolutely no time before plunging his tongue deep into your hot, exposed cunt, his lips pursing along your opening as he collected your juices. The muscle pulsed along your slick walls, undulating inside of you as he began to swallow your sweet nectar. Your eyes rolled back as your body reacted to the unfamiliar intrusion – moaning wantonly as he fucked you along the length of his tongue, before roughly pulling out of you, leaving you to whine at the sudden cut off from your impending orgasm.
You gasped as he turned you upside down and brought you close to his hardened cock. “Suck on it,” he demanded, and you obliged – having to use both of your hands to fully wrap around its girth before suckling at his tip. He plunged his tongue back into your tight pussy, causing you to moan around the head of his swollen, flushed cock.
“Shit– that’s it, keep doing that,” he groaned as you began bobbing your head along his leaking tip, fitting as much as you could into your mouth while using both hands to stroke the remaining length of his dick. You licked along the underside of his cock, the veins adorning it throbbing against your tongue, his soft groans spurring you on. He started to rub your clit as his tongue entered your tight hole once more.
“Fuck!” you whined, “i-it’s too much! Obanai–!” you pleaded as he stretched his tongue further into your pussy, the forked tip slightly brushing along your cervix. He moaned, sending vibrations deep into your gushing cunt, putting you in a daze as you lazily stroked his cock. You could feel the tension build up deep within your stomach as he continued to prod his tongue through your wet entrance.
“C-Close…fuck ‘m gonna–!” you screamed as your orgasm ripped through you, and Obanai groaned as he lapped up all of your release with his tongue, swallowing all of it. He didn’t let up on the binding he put you in with his tail, but he did position you right side up again so he could kiss you, letting you taste yourself on his lips and tongue.
“So dirty, wanting to be fucked by something like me,” he groaned before pinning you against the rock once more, dragging his cock along your folds. You whimpered, causing him to chuckle, “you want this serpent’s cock? Want to get filled with my filthy cum?” and you nodded, your head falling back before he grabbed your chin, forcing you to look at him. “I asked you a question, sweetheart.”
“Yes! Please! Wan’ your cock inside me– oh fuck!” you cried as he wasted no time shoving it deep inside you, filling you balls deep in a single stroke. You could see the outline of his cock as it pushed against your tight walls, the slightest bulge showing along your abdomen as he pressed inside of you.
“Shit, even after I stretched you out with my tongue, you’re still so fucking tight,” he panted, his grip that bound you loosening a little as he began pounding into you. “Such a dirty fucking whore, what would your people think if they saw you getting ruined like this?”
You whined, unable to respond with how well he was fucking into your cunt, easily hitting that one spongy area that caused you to arch your back even further and clench around his cock. “Hm? Do you like that idea? You’re dirtier than I thought.” He increased the intensity of his thrusts, and you could only hear the pap, pap, pap of his balls slapping against you as he relentlessly impaled you on his cock.
His thrusts became sloppier as he got closer to his own climax. “I’m gonna fill you up, you’d like that, wouldn’t you? Hah- gonna breed you with my cum, then everyone will know you got fucked by a nasty serpent like me.” You whimpered and nodded, and he smirked before pressing his cock fully into you, groaning deeply as he emptied himself into your hot cunt, triggering your own orgasm as you gushed all over his dick. He pulled out of you and drew back his tail so you were no longer bound by him, lowering himself so he could lick at your pussy once more, tasting your mixed juices on his tongue. You jolted as he flicked at your clit, and cried out from the overstimulation before he parted from you.
“I’ll let you go – swim along home, dear. I’ll be down here if you ever wish to indulge me again,” he stated before licking his lips, eyes still hungry as he gazed down at you. You nodded and swam back up to the precipice of the cliff, cum still leaking out of you as you started to return home, only stopping yourself minutes later as you shamefully realized that you had nothing left to cover yourself with as you emerged from the depths.
Perhaps you’d stay, you thought, no one ever returned from swimming beyond the reef, after all.
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