Chapter Text
Another year, another heat spent alone. It was always like that for Levi, and after millennia spent alone, he has found a trick or another that kept him busy and satisfied for the entirety of his heat. He never liked taking strangers like his brothers; the fear of being rejected or being deemed weird for how he… mated, was just too strong. Even for demons, Leviathan was deemed as weird, as an outsider. He used to take partners, a long time ago, just for the process, but once the heat and the ecstasy of the cycle had worn off from both him and his partner, they would run away disgusted and confused, leaving him hurt and sulking. At some point, he couldn’t take it anymore and decided to just keep to himself. The first few hundred years or so were hard; he made Lucifer lock his door with a spell so he couldn’t escape because the primal need for a partner was way too strong, but it worked. When he found Ruri-chan, she became his ‘partner’ in a sense. He used the body pillow he owned of her, mixed with a fleshlight. It was weird to him at first, but it seemed to do the job.
But of course nothing ever went the way he wanted it to go. You just had to come along and ruin it. You and your feminine scent. Your sweet nature. Your very… breedable body. A woman in her prime, ready to be taken by a suitable mate. He didn’t bother trying, really. You wouldn’t want him anyway, not when you find out that you’re breeding with a literal demon; a monster, a freak of nature. But it wasn’t up to him anymore. Not now. He told Lucifer to make sure the spell was on his door days before the heat even started, just in case you decided to show up and his body decided to jump into action before the actual cycle was supposed to happen; he couldn’t take that risk. Not with you. He cared about you too much. You, however, were worried about him. Of course, no one told you what was actually going on; demons don’t talk about their heats over sunday lunch. It’s private, personal… They just told you he was feeling unwell, that it was a disease humans don’t know but is deadly to them. Of course, even the threat of death wouldn’t keep you away.
Big mistake.
The minute you turned the door knob, he freaked out. Excitement ran through his body and all his nerve endings were on fire. He was in the middle of releasing himself, trying to find some kind of friction against that painful erection, and then you showed up. He smelled you. He always did. Why wasn’t the spell working?! He freaked out harder when the door tried to open, trying to run across the room and close it before your scent really drove him wild but by now you were already in the room, which had been darkened days ago. You shrieked when you saw him run toward you, half naked and in his demon form. You noticed he had his tail curl around his leg right now, like Satan so often does, but you didn’t know why. He did that because if he didn’t, his tail would’ve long wrapped around your leg and pushed you against the floor. “(Y/N)!” He was breathing heavily; his body was preparing for the process and it was amazing, to him, how even just the sight of you was enough to send him into such a state.
“Levi! Are you okay?” No, no he wasn’t and he won’t be until you leave. “G-Get out…” He groaned, feeling his cocks twitch in his pants, which he quickly tried to cover. “Oh my! You don’t look good… come here. We’ll get you back to bed.” you reached your hand out, touching his naked shoulder, but the minute your hand made contact with his skin, something inside of him snapped. With clenched teeth, he growled at you, letting his tail unwrap and wrap back around your leg, pulling and tripping you until you were on the ground. You landed with a thud, groaning as the floor hit your back. His hands clenched and unclenched into fists, his breathing picking up when he sees you beneath him. “(Y/N)..” his forked tongue hissed your name, and he quickly covered his mouth, embarrassed by what he was doing, but his tail didn’t give him the satisfaction of apologizing, no. Instead, it had wrapped around your upper thigh, caressing over the pants you were wearing.
His hand came out to push the door back shut before he jumped on top of you, careful not to actually crush you. His tongue, once again, came out to lick over your cheek and you shuddered beneath him “L-Levi…!” He whined in response, licking his own lips, “I told you to leave…” He dipped his head down, inhaling deeply by your neck; you just smelled so good and he was soooo…. Needy. His hand moved down to cup his bulge, rubbing over his cocks through the fabric while his tail flicked over your pants. You looked down, watching him rub himself and feeling that familiar wetness between your legs; he could smell that too. His lips crashed against yours hungrily, and you actually opened your mouth for him, feeling his forked tongue while he undid your pants and tore them off. “L-Levi!” you shivered when the cold air of his room hit your skin and he groaned out, pushing his hips back against his hand which was still rubbing him. He was getting impatient and the tail that was curled around your leg undid itself to lash out behind him. He wanted you; he needed you.
Harshly, he spread your legs, tearing your panties off to feel between your folds; the slickness on his fingers made him sigh with content and had a warm spreading through his body; you were ready. Your body wanted his. It turned him on even more and his tail slithered back up to your entrance, testing it by pushing the tip in. You gasped in surprise, trying to close your legs at the foreign intrusion, but he didn’t let you. “Stay still. I’m going to… I need to…” he growled before he could even finish that sentence, flipping you over and pulling your ass back up toward him, that way you didn’t see his double, serpent like dicks when he pulled his boxers down, and it was easier to push his eggs inside of you. He groaned when he pushed his tail further in, feeling you clench around him. It was slick, sliding in easily, and you noticed too how swiftly it entered, barely filling you but still giving you the sensation of penetration. “W-what.. Levi it’s so...deep…” You whined out, trying to push yourself on all fours, but his hand on your back pushed you back down.
“Stay still. It’s easier to.. Fill you this way…” He groaned at the sight of his tail inside you, feeling the eggs try to push out of his tail. He groaned, pleasure seething through him as he grabbed one of his cocks and began to stroke it while his tail thrusted in and out of you. He made sure to push up against your cervix, moaning loudly when the eggs came out one by one and his tail pushed them straight into your womb.They were just eggs right now; still unfertilized. But that’s what the next part of his heat was for. You gasped in shock, bringing one of your hands to your stomach as you felt yourself be filled. Your body… it was just accepting it, taking it hungrily and the way his tail thrusted, pumping as it laid the eggs inside of you, had you moaning in bliss and close to an orgasm. “L-levi…” you couldn’t really say anything, but Levi knew. He sped up his own movements to chase his release, growling as his hips bucked, but not yet. He pulled his tail back, watching some of the liquid that protected the eggs inside his tail drip out of you.
He needed you now; he couldn't wait anymore. “W-what are those….” You rubbed over your lower abdomen, feeling them inside you, but you didn’t have much time to think. Levi spread your folds with his thumbs before pushing his top cock in, groaning in bliss at the feeling of your wetness. You felt his other cock rub over your clit and onto your lower abdomen with each thrust he delivered and a quick look down confirmed it. “T-two…?!” His nails dug into your hips, slammed them back against his as he thrusted, clouded by primal instincts and lust. He needed to cum; needed to fill you if he wanted to mate with you, and god he did. Your scent, your pheromones drove him wild and he growled again when he slammed into you, his cocks twitching as he thrusted fast.
You moved against him on the floor, crying out with each passing thrust and the feeling of his other cock rubbing over your clit. He brought you over the edge without warning, your walls pulsating around his cock while you rode it out. “Fuck….” He cursed under his breath, pulling your hips back against his before releasing inside you, deep. He made sure to hit right against your cervix, shooting his seed right into your womb and onto his eggs with a heavy breath. He was still rock hard, twitching and whining softly when his other cock released too, this time on the floor. He hated it; hated how it went to waste, and his eyes turned dark when he flipped you again.
You groaned when you landed on your back, feeling him pull back a little, just enough so he could guide his other dick toward your entrance too, “w-wait levi..!” You didn’t know if you could take it, but excitement rushed through you and when his other tip pushed in too, filling you up as well, all you could really do was cry out and arch your back. He moaned loudly when he bottomed out, taking your legs and pushing them on either side of your head so he could reach deeper, “mine…” he growled. His possessiveness was turning you on and you couldn’t help the clench that followed.
He thrusted again, the sound of your wet cunt and his thrusts mixed in the room with your moans. His tail slithered back up to wrap around your waist, his hand making quick work on your top and bra. His tongue came back out at the sight of your breasts and he dipped his head down to let it swirl over them while his tail rubbed over your stomach with each thrust. You felt so full, feeling the eggs inside you and now his tail over them, as if it was encouraging you to take it. You whined in response, feeling him speed up again. You didn’t know if it was you or him but you felt so wet, allowing both of his dicks to enter with such ease and take you apart from the inside.
His thrusts were bold, heavy, and quick. He pinned your hands down, squeezing tightly as he pounded you from above with clenched teeth, making sure he bottomed out with each thrust as he looked down at you with wondrous eyes. “Mine…” he repeated, snapping his hips forward. You cried out again, the pleasure too much as you shut your eyes tightly, feeling another orgasm approach. Your breasts were bouncing on your chest and he was quick to catch them with his hands, groping roughly as he brought you over the edge one more time. You arched your back into his hands, letting your own fly up and dig into his shoulders with a cry of his name. “L-leviathan!!”
An inhuman growl escaped him as he felt your nails in his skin, and he slammed into you hard, releasing without warning. His thumbs were brushing over your nipples as he watched you, his cocks twitching inside you as he ensured you took all of his potent seed. “Going to… fertilize my eggs.. Your eggs.. Need you to be bred…” he hissed out, and you watched his tongue wiggle with each word as slow thrusts guided him through his orgasms. You could feel his hot seed spill inside you, your cervix clenching and sucking it all up. “B-breed…” it was more of a statement, although you meant for it to a question.
You didn’t get much of a break, he already picked his thrusting back up, “again…” You groaned in response, feeling the eggs move inside you as he thrusted. The tail was still rubbing over your stomach, encouraging you to keep going as he filled you, over and over again, for days to come.