Work Text:
Just like with Beel, I bring you self-drawn images of what I HC Leviathans' delicious cocks look like. You can find it >> HERE <<
Upon learning that demons had heats, or ruts in the case of the males, you had sunken yourself into learning all that you could about it. Every demon dealt with it in their own way, though you had learned that the brothers spent most of theirs in their respective rooms, with a hand down their pants or a new demon every night.
You had cautiously approached the bookish fourth-born, Satan, to ask for his books on the subject and he had given you an amused raise of a blonde eyebrow, then went about his way, pulling books from high shelves to hand to you as he went. By the end, there was a good four or five books on the subject, some of which were hefty tomes. Satan stopped for a moment, taking a break to look around with a pondering expression and a hand on his chin as he thought. Looking back at you, he double-checked the titles he had given you before meeting your eyes once more.
“Can I ask who?” He probed, ignoring how you blushed and glanced away from him.
“It’s… Ummm..” Suddenly the cover of the top book was very interesting in your refusal to meet those lovely eyes, “It’s Levi.”
Shock was the only word to describe what passed by his features before it was smothered once more, “You might have your work cut out for you, kitten.” He laughed, turning back to his books before reaching for another one, “And I don’t just mean getting him in bed. Leviathan is the most… Interesting of us all.”
“What do you mean?”
“We’ve all seen each other at some point, and it made Asmo a little jealous, but I won’t ruin the surprise for you,” He gave you a sly smirk, “Levi will be pleased though.”
The last book was a lightweight one, with colourful imagery on the front that would have made you laugh if you hadn’t immediately picked up on the similarities between the cover and a certain lavender-haired Otaku. The title was the next thing to catch your attention:
Help! I've fallen in love with a demon sea serpent and now he wants to lay eggs inside of me!
“Satan.” He looked at you again, away from tidying the books that had tipped and moved from the others pulled away, “Please tell me this isn’t real.”
There was no response other than a small raise of his lips at the edge.
Back in the safety of your room, with your damn demon pornography, you scoured the regular books first, taking in all the basic details of demon heats and what they entailed. Usually a week or two a year, where they would seek out a partner who was fertile, and bang until they either worked themselves through it or until whichever one was carrying offspring. Given Satan's comment, you figured it would maybe be good to delve into the chapter titled 'Adaptations' though nothing could have prepared you for the horrifying sights that met you. Knots the size of melons, barbs that speared internally to lock them in, venom that basically reduced the other to a pliant heap. There was one image that made you shudder ever so slightly, a long stinger-like appendage that some insectoid demons had that they straight up stabbed through the abdominal wall - horrifying . But the boys were Celestial originally, surely they'd be mostly normal right?
Onto the manga you went. Spending the rest of the day laughing at the comparisons and realising very quickly that the image used was the only thing that even vaguely resembled Levi. The sea monster in the book was a loud-mouthed, flirtatious beast that was constantly jerking the lead female's chain. Just as you got to the last few chapters, the imagery turned filthy… multiple long cocks poking out from his crotch, and tentacles across the pages as he finally took the heroine across a sandy beach with the waves lapping at their feet. It was romantic, lovely, and definitely on the right side of monster fucking for your brain. Now time to get a plan in action.
It had started as little touches when you went to his room to game, Levi - despite being in his rut - was quiet, and blushed easily at your compliments and comments. A hand would brush across his as you reached for the snacks, and when you grew bolder at his lovely reactions, you leaned across his lap to grab another can from beside him. Yelping in shock, Levi was the perfect shade of crimson across his whole face, and you couldn’t help but lick your lips at the thought of him making those sounds between your thighs as you rode him into the next day.
Between the touching, and showing off with long stretches and little displays of your body as your shirt rode up to bare your stomach, Levi was a mess. Constantly stuttering as he spoke to you, his gorgeous sunset eyes dragging away from the flashes of skin to anything else he could possibly look at. There was a sheen of sweat across his forehead and a constant redness as he tried to dodge your little intimacies towards him. Though from the way he leaned into the touches ever so slightly, or side-eyed you when he thought you weren’t looking, you knew the interest was there for sure. A final touch was near the end of the night and you were becoming slowly more desperate to have the third brother lose himself in your body that you were resorting to measures that you really had hoped not to. Having completed the game between the two of you and sharing a little victory cheer, you had bunched the beanbags together in front of the TV and made a little nest of sorts with blankets and pillows, ready to watch some anime. Noting with some interest that Levi was taking his time to arrange everything in the cuddle corner, pushing the blankets into an acceptable shape for him. Gesturing for you to sit down, he then proceeded to push them around a little more until they were snug and comfortable. There had been a chapter on this in the Turning up the Heat - a Guide to the Rut book, where it mentioned that the early stages of heat were often spent prepping a nest and suiting it to their chosen mate, and was almost always a positive sign to predate the actual mating. Grinning up at him, you reached out to grab his hand and felt him freeze for just a moment before pulling him down into the nest. Following instructions from the book, you returned the favour, padding the nest around him and watching the furious rush of blood to the Otaku's face as you patted the fluffy blankets around him. Finally, with both of you happy, the last blanket was pulled over the top and you leaned in towards him, waiting for him to relax and let you cuddle in just a little bit. Warmth radiated from him, along with the scent of the ocean - salty and thick - as your head leaned on his shoulder, right at the juncture of his neck where the scent was strongest, taking a second to nuzzle into him and coat yourself in it. Levi froze up, the lights flicking off with the click of his fingers and the only light in the room came from the large TV. Ever so softly you could see the bioluminescent pulsing just under his skin - a pale lilac throbbing in time with his heartbeat as your fingers raised to run across the brightness. Levi shied away, the light brightening where your digits had nearly brushed before you pulled them away with a frown, returning to the show.
That was enough. You’d have to resort to plan B.
The show finished. Smiling as you listened to Levi rambling about his favourite characters and how they had defeated the enormous monster at the end of the dungeon - apparently forgetting all about your little play earlier. Standing and looking towards him, you approached his desk. Watching you intently, he stuttered and quietened.
"You know, I've got fond memories of this desk, Levi," he gulps as you address him, a trickle of sweat trailing down his neck, dipping below the collar of his jacket, “Whilst you were away for the exclusive figure, I guess we just couldn't help ourselves"
Oh, there - a flicker of that envy. The green-eyed monster indeed raised its ugly head and snarled behind Levi's nervous sunrise eyes. "W-what do you… you mean?" He stammered, watching intensely.
"Well, me and Mammon got a little… caught up," There was a rumble in the back of his throat, a deep trilling that reminded you of whalesong, "And your desk was the only acceptable place really. Can't be doing it in a bathtub on top of your Ruri-chan body pillow could we?"
"You…" his voice was quiet, dangerous, with just a flicker of that Grand Admiral that you knew lurked beneath it. Just a little bit more and you'd have him. "You fucked Mammon on my desk?"
"And the beanbags by the TV, I sucked his cock whilst he played Demon Slayer Quest II,"
He snapped. Just like that, you were in the tub, surrounded by the cast iron walls of Levi's bed. He was above you in his demon form, seemingly so much larger and almost hulking - not the demon form you were used to. His voice crested and broke like waves across the shore, his body almost ethereal like the sunlight underwater. No words could be found in your head to describe the demon above you now with his slitted pupils and coral horns bearing down upon you. Purple bioluminescence rippled across his skin in shimmering displays. Even as his sin tore through him, he was showing off, displaying for you as a mate should, even as his tail coiled around your waist and pinned you into the pillows. Light from the TV reflected across his eye like an animal at night, caught in the torch beams. Hips pressed down into yours as Leviathan let his weight come down atop you, pressing into the pillows beneath. Rumbling echoes from his chest like thunder and his face came closer, almost brushing lips against your own - parted to welcome him - but instead found the side of your neck, nipping across the skin with teeth far sharper than just fangs.
Winding one hand into his hair, a sharp hiss escaped the demon above you as the gentle touch brushed against those coral horns - so delicate and sturdy all in one, rising above his head like a crown. How could he not see how stunning he was, even amongst his brothers, he was so unique. The glowing just beneath the skin brightened as your other hand reached out to grip the zipper of his hoodie and his eyes just watched, never leaving your own. His chest was cool to the touch and the scent of the ocean grew stronger with the more skin that was revealed. Gasping quietly, you let your fingers run across the scarring that marred his perfect paleness. It had never really dawned on you before that the nervous, anime-loving big brother had been part of the Celestial War, had fought for what he and his other brothers believed, and suffered like the rest of them. Leviathan tilted his head as nails scraped delicately across the worst of the scarring around his shoulder, the other hand remaining tangled in his locks. This was in the books again, the heat-fogged demon brain taking over and enjoying the feeling of you exploring his scarring because it meant he was strong and had survived things that would kill most normal demons. Something tickled at your hip, his tail winding itself up your shirt to dive beneath your bra and flicker against a nipple. Dropping your head back onto the pillow, he watched the submission, the acceptance of his strength, so far away from the Levi you knew - oh how he would blush when he could think straight. For now, you were enjoying the rutting demon, his instincts taking over as his mouth dived against your throat to press those dagger-like teeth in until there was blood beading from tiny punctures.
Tasting the coppery liquid seemed to bring Levi back from the edge and he shot backwards, toppling out of the bath with a squeak. Popping your head over the edge, you watched him as he scrambled into the nest of pillows and blankets.
“Did-did I hurt you?” He yelped, eyes wide and watery.
Climbing out of the bath, you crawled towards him slowly as though he were a cornered animal, “No, Levi, nothing that I didn’t enjoy.” His breath was quick, chest pumping as he gulped as much air in as he could. It was only now that he was spread out in front of you, lying back against the nest that you could really appreciate the planes of his chest and stomach. Lithe and smooth, he looked like an Olympic swimmer, which you guessed made sense given his sea serpent nature. The scarring was slightly darker against his paleness and crisscrossed his abdomen, despite the millennia since he had earned them though they did nothing to subtract from his looks at all. Unnoticed by you at first, was the set of gills that fluttered across his ribcage with lavender filaments peeking from them. As he noticed your eyes wandering to them, he pulled his hoodie around himself to cover himself from your gaze.
“S-stop that!” His face was crimson as he looked away, “Stop staring at me, I know I’m a freak…”
“Levi, you’re absolutely breathtaking.”
“What? No, I’m a yucky Otaku,” Levi coughed, shaking his head violently. You reached out towards him. Despite tensing up, he let you pull his hoodie aside once more. Crawling closer, your mouth met his chest and left butterfly kisses across the darkest marks and feeling his breath catching beneath your ministrations. Soft whooshing accompanied the gill slits forcing air through them, that smell stronger than ever. You wondered if they were as soft and feathery as they looked, stopping your fingers before they made contact with the tendrils. Levi seemed to ground himself enough to notice where you were headed with your touch and gulped, drawing in a deep breath and nodding. As fingertips met them, you smiled. Sure enough, they were silken and soft and slightly damp. Shuddering beneath the attention, Levi’s pupils seemed to thin again, the blush dissolving as he trilled in the back of his throat again, deeply this time and came towards you. Orange eyes locked on, and he slinked forward still, using his power and presence to topple you back into the thick padded nest before resting above once more. That slender tail made its move this time, dragging your pants down and tearing through your shirt with a loud rip that had him fighting himself for self-control again. Panic rolled through him again, chasing the demon back and leaving him nervous and closed off once more. Whiplash came to mind, as you watched him flicker between the two very distinct entities - Levi the Otaku, and Leviathan, the terror of Hell's oceans.
“Levi, please,” You begged, tugging him towards your mouth for a sweet kiss that had him squeezing his eyes shut tightly, “Please? I’d like to spend your rut with you.” Even quieter you whispered to him, “I’d like you to breed me please?”
The sharp intake of breath as he trembled above you seemed to steel him, and he nodded still with his eyes shut tightly, “O-okay, but you need to tell me if I hurt you… I-I’m not like my brothers, I’m not a normie .” Propping himself up on one forearm above you, he took your hand and led the other down to his own pants. You let yourself slip below it, watching Levi closely so you didn’t scare him off again, only to be surprised by the fact that despite how keen he seemed… There was nothing there.
"Uhhh Levi, where is it?" You whispered to him, fingers seeking his cock below his waistband only to find a long, wet, scaly slit between his legs. Stroking a finger across it brought a strangled trill from the demon's throat. The slit twitched ever so slightly.
"Just keep doing… that, " Levi chokes out, "You'll see."
Sure enough, with your fingers tracing the sensitive scales, gently dipping into the dampness - oh the sound that pulled from him was delicious - something began to push back against you. Oh. OH. Two somethings began to push against you. The look of horror on your face must have been caught by Levi as his hand covered his face, redness spreading across his features.
"I knew you'd think I'm disgusting…"
Quickly regaining your composure, you ran a finger across the uppermost cock, feeling its long, slender tip almost writhe against your finger, "Not at all Levi, I just got caught off guard that's all. It's a lot to work with, but I'm sure we can manage."
The compliment seemed to boost his confidence ever so slightly, and he met your eyes with a groan as your finger repeated its movement, finally teasing them out in their fullness until you were met with the most majestic and unusual dicks you'd ever seen as you peered between your bodies. Thinly tapered but thick at the base, with ridges across the underside, they were a deep lilac with the lower one being paler in colour. Whilst they weren't as malleable as a tentacle, they did seem to have a fairly large range of movement and twitched and shivered in your light grasp, almost leaning into your hand. Not to mention they were slightly damp, but not in a sticky unpleasant way, in fact -- rubbing a thumb across the slitted tip, you pulled it to your mouth - he tasted like the seaside even here, like salt water and something deeper, darker.
"Don't do that!" He yelped, dicks twitching as your finger popped from your mouth.
"Why not? You taste amazing."
"Because… it's gross!"
"Levi," You began, taking your other hand to stroke both of them, "You are nowhere near gross, and I think you have the most perfect body, and dicks that I've ever seen, and I would really like them both inside me."
The colour he went was almost unreal, a flaming red so hot you'd probably burn yourself by touching his cheeks. Burying his head in the side of your neck to groan, “You have to stop saying things like that, I’m just barely holding on.”
“And what’s wrong with letting go a little?”
“Because I want so fucking badly to put a clutch in you, fuck please keep touching me like that.” Sliding your hands across the ridged undersides of both of them had him writhing in pleasure, and there was a grin as you watched the little pinpoints of yet more bioluminescence flash up the sides. Part of you wanted to laugh, they were flickering like an airport landing strip, almost like they were directing you where to put them, but if you laughed, then Levi would surely retreat into himself again. Wait. Did he say clutch?
“A… Clutch?” Your hands slowed to let him talk, thumb lightly brushing across the slitted tip and wringing a groan from his throat that echoed through the room.
“Yeah, eggs.” He flushed as he answer, hips jerking forward into your touch to demand the attention return, “I want to put a whole clutch in you, and keep you here in this nest until you’re ready to lay.”
Okay. So the manga mentioned this, and there was a rather large part of you that thought that was just hot as fuck, and wanted to watch your stomach distend to make room for his offspring, but there was something bothering you before you let him.
“Will it hurt?” Your voice was so, so quiet as you nuzzled into the soft spot behind his ear, forehead brushing those elegant horns.Bumping you with them, he shook his head and thrust into your hands again.
“No, I make a painkilling aphrodisiac,” He murmured against your shoulder, lips tickling the sensitive spots there, “It’ll feel a little uncomfortable, but not painful.”
Taking a deep breath, you ceased all movement across his cocks, closing your own eyes and letting the determination fill you, “Okay then Levi, I want you to fuck a clutch into me.”
He was on the tail end of his own grounding breath when the inner demon came back with a vengeance, snarling and latching onto your shoulder. This time he was careful not to break the skin, but dimpled it beneath his dagger-like maw, free hand grasping to remove the last shreds of clothing from you, and push his pants down just far enough to give him free movement. Part of you was so glad that the teasing and touching of the night had already started the leak of your own wetness, and the back-and-forth of him trying to take you had only helped. On top of that to find that the demon you had loved and lusted after was going to fulfil some dark little fantasy of breeding you full had just been the icing on the cake. Said demon was currently rutting against you, that textured underside of his lower dick settled between your folds and grinding against your clit on each stroke, pulling whimpers from your throat each time. Pleasure was building slowly as he held you there between his jaws, humping desperately until you moved your hips and the tip caught, sinking in to the base in one swift push.
“Oh fuck…” Levi groaned, releasing your shoulder to kiss along your jaw, hesitating above your mouth and letting you come to him. His mouth was soft, and cautious, but not inexperienced. Cool saliva mixed with your own as his forked tongue invaded your mouth to tangle with your own, tasting you. Moaning shamelessly, you tried to move back against him, only to feel a clawed hand flex on your hip, holding you firmly in place with a grip that left no room for argument.
“Don’t move,” He hissed, “It’s been a while and I don’t want to blow until you have.”
Once more came that soft tickling sensation, his scaly tail winding itself up your leg to rest the tip against your clit, just rolling across it and bringing more sounds from your throat. The pleasure was already riding the edge from all the tormenting of the last few hours, and Levi was now buried deep inside you, his cock moving in ways that felt almost obscene. The upper one was resting against his tail, twitching occasionally as though to remind you it was there too, and an idea came to mind.
“Hey, Levi,” your hand snuck down to play against the tepid scales of his other dick, “Can you maybe have both of them inside me?” Your blush was nearly as deep as his as he pulled out to the head of the cock sheathed within you, pushing the tip of the other against it and feeling them squeeze together. Both of your breaths hitched as the girth doubled and he pushed forward, the stretch burning just slightly until it began to melt into pleasure. This must have been the aphrodisiac he was talking about…
“You must…” He huffed as he pushed in slowly, wiggling his hips to accommodate them both and feeling your tightness clamping down on him further, his tail rubbing against you once more to try and take the edge off the sharpness of being double-dicked down, “Really, really want me to knock you up… Like one of those girls in the hentai I know you watch.”
He knew you watched it? That was a little embarrassing… But you couldn’t think of that as he moved within you, pulsing even though his hips were locked in place.
“Stop teasing me, come on, I was promised eggs!” There was a teasing lilt to your voice, and your hands found his hair and back, digging blunt nails into his scalp and shoulder blade until he growled into your mouth. Drawing back slowly, his growl deepened as your pussy tried desperately to hold onto him, clenching around his lengths before he pumped back in, delighting a little bit in how your stomach bulged where the twin tips of him reached deep within and knowing that he'd have to move quickly when you tipped over the edge. Speeding up, his cocks hammered into you, drawing wails from your throat as the tip of his tail continued to roll across the bud above your hole, drawing the pleasure tight in your stomach, and you knew you’d reach your end before long. As the pleasure built, there was a different sensation making itself known, and Levi had an intense look on his face, eyes half-lidded and blazing, but his brows were tightly knit as you felt it. Pain registered in the back of your mind before it flooded with pleasure as the narrow tip of one of his members breached your cervix, stretching it as it entered your womb and the little spark sent you to heaven, screaming out Leviathan's name as he groaned and buried his teeth in the join of your neck and shoulder. You could feel the thick pulse of his seed flood you, along with the solid push of something much larger within you. With a huff, the first one passed through, probably the size of a chicken egg, but soft and jelly-like. It almost brought you to orgasm again, and the push of the second did, Levi having to pin you down with claws and tail alike as you threatened to unseat him as he fill you with his brood. It felt like forever as each egg travelled up his length and settled within you until your stomach was rounded and slightly lumpy from the sheer amount, but eventually he slid out with a thick sloshing of his massive load - some of which began to trickle down your thighs as the plug of his cocks left you, retreating back into him and sealing up. Time stopped for a moment as you both basked in the afterglow, Levi collapsing onto the nest to cuddle - his head settling across your breasts to kiss the soft skin of them as his hand trailed across your abdomen, feeling his clutch settled within you. It seemed to hit him all at once and he returned to being the awkward, unsociable man he was previously.
“Are you sure this is what you want?” His voice was high and he almost leapt as your own hand came to where his rested, feeling the strange spongy sensation and the feeling of eggs shifting within you as you pressed down, “I-I shouldn’t have, what are we going to do with them?”
“Shhhh,” You chided, snuggling into the Otaku, and feeling him relax marginally, as if he expected you to reject him now that he’d shown his unusual demon biology, “I want to nap for now. Are we going to be parents? It’s not something I’m versed in.”
Levi stuttered, his cheeks flaring hotly as he avoided your eyes again, rubbing the back of his neck with the hand not protectively laid across you, “Only if we get them in the water after they come out, otherwise they’ll just dry out… You’ll probably lay them in about a w-week.”
“So we still have time to decide then!” Your grin seemed to ease him further and he settled back into your side, cuddling in once more. Looking down at your chest, you frowned and ran a hand across them, “I wonder if these’ll swell with milk.”
Levi glanced towards your tits, then back at your face. His hips shifted closer once more and his eyes widened, “Hey… Can I put another clutch in you to be sure?”
"Give me five, and we can go again."
His second question was much quieter, "You didn't really fuck Mammon on my desk did you?"
That made you laugh, petting across the softness of his bright hair, "No, But maybe the next round can be there so every time you're gaming it'll make you think about it."
The only response was a double twitch against your lower half.