Monster's Pet
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The mating cave
🕑 Added 2025-01-21 15:30:01 +0000 UTCPatreon Commission for Zars
A/N: Thanks to the wonderful @dragonsholygrail for helping me plot this commission. Enjoy!
Mershark x fem!reader || soulmates, oral sex, double peen, double penetration, anal sex || tw: mentions of blood
You are trying to swim to the cave when you accidentally touch the pointy coral. You let out a watery gasp, almost choking and having to swim to the surface in a rush when the air leaves your lungs. You look down in time to see a cloud of pinkish blood, your blood. Shit. That’s not good, it’s the mershark territory, you can’t go around bleeding over their coral reef.
Fuck. Fuck. Fuck.
The fish under you disappear, as if something big is coming your way and you had a second to think before you are swimming as fast as possible to the entrance of the cave. You know where it is, the witch gave you very precise instructions, and you are so close…
You barely made it to the opening before you jump out of the water, your back plastered to the rock wall as you see a big shadow entering right behind you, a big body that makes your blood run hotter in an instant.
“You are not mershark,” it’s the first thing he says when his body is out of the water.
You stare at him, gaping and making you look like the half-fish in this interaction. As if he didn’t look like a humanoid shark… a very hot humanoid shark. Your brain is not fully processing everything that had happened in the last couple minutes, but you are trying to catch up fast. You need to react, you need to comprehend that you (finally) have found what you were looking for. Hopefully.
“You are not human,” you shoot back when your brain started working again. What kind of shitty response is that? You curse yourself internally.
He doesn’t seem to mind your bullshit response. “How did you get here?” He asks this time.
“The witch led me here,” you let out in a breath, thinking the truth will get you further than more stupid comebacks. “I made a deal and she said everything I was looking for would be here, and then… You appeared,” you add, trying to be as coherent as possible as your eyes threaten to travel across his slippery big body.
“Your blood called to me,” he says as if it’s as easy as that. You look down at the tiny cut on your arm, blinking slowly. “You are mine. My mate. My forever partner.”
“Easy there tiger…” You tell him, chuckling. You knew the witch said everything you ever wanted was in the cave, but that sounded like a whole lot of intensity for a mershark.
“I’m not a tiger. I’m mershark. And you are human. We should be able to couple. Some have before,” his nonchalance and the way he states facts as if life is as easy as that made your eyelid twitch with tension. You wish life was that easy, you really do. But it’s not. But he keeps talking as if your inner turmoil is not even there. “There’s records of other mershark and human coupling. We should get to it, finish the mating.” He steps in your direction, his tail transforming into two big as tree legs that have your mouth going dry.
“What do you mean finish?” You ask, licking your lips and allowing yourself to look over his body with not so innocent intents. Fuck, he’s huge.
He twists his head to the side, as a puppy would do, and it makes your mouth twitch, wanting to smile badly. “You shed your blood for me to find you, now I breed you and we are together forever,” his explanation is as weird as it was before, and your brain can’t process everything at the same time blood runs south, your pussy tingling when he steps close to you, his body heat warming your skin without touching.
“You… I… What?”
“I’m going to taste you know. Your pussy smells even better than your blood,” he says before he falls to his knees in front of you.
The promise of the witch about everything you wanted resonates in your head, and you are unable to fight him, you want this. All your confusion and hesitation flies right out of your mind. He pushes one of your legs over his shoulder and your hands grab onto his wet slick head when his big tongue finds your wet opening.
He eats you out like a pro, you don’t even know how a mershark with all his teeth and huge fucking mouth can be giving you more pleasure than any human ever had. It’s exhilarating and insanely good, and you are losing your track of thought when his pointy teeth scratch in the lightest way against your clit, sending you over the edge as he continues to lick you over, from asshole to clit and back down.
He eats you out like he’s starving, like he’s aiming for a goal no man has ever reached: getting you to come twice just with their mouths… And he reaches it.
You are breathing hard by the time he pulls away from your quivering pussy, your whole body trembling and your pussy asking for more. He smirks down at you and it’s almost fearsome, but something in his smirk makes you burn from the inside out. And then you look down and...
“You- you have two!” You exclaim, your mouth agape with surprise, finger pointing accusatory to his dicks. Plural. DickS.
“Yes. Of course, and big, too!” He looks so proud and smug that you almost want to laugh, but you are too busy gaping at him.
“That’s… Humans don’t… Humans only have one,” you try to explain, and that only makes him chuckle as he grabs your ass and urges you to wrap your legs around his middle. You touch his tail with your heels and he shivers, moaning deep and low and making you whimper in response.
“But you have two holes, I’ve seen them. I’ve licked them.” You blush in embarrassment at his words, making a choked sound that’s half groan, half chuckle. He rubs his dicks against your openings, and you throw your head back, groaning at the sensation. “I shall prepare you properly, mate, do not worry.”
He fingers you open using some of his saliva and your juices, adding some of his precum to the mix to make you as slippery as possible. He starts slow but rapidly increases his pace, using two fingers and scissoring them inside your asshole, driving you insane with a pleasure you didn’t know existed. It’s like he knows every single pleasure point in your body and he’s exploiting them all at the same time.
He’s holding you up with just one hand as he works you open with the other, your head is thrown back and he’s nipping at your neck with his too pointy teeth. The whole situation is dancing between surreal and fucking dreamy, and you can’t do anything about it when a third orgasm rocks your body when he rubs his lower cock against your clit, and his fingers inside your asshole twitch in the best way possible.
You scream your release as he smirks against your skin, you pull at his back fin, making him whimper. He positions himself, his lower cock, thinner and longer against your asshole, and his upper one, wider and shorter against your pussy.
When he pushes both dicks inside of you at the same time, your brain stops working, your mouth opens in a silent scream and you are seeing stars behind your eyelids. It’s everything and more, it’s so overstimulating your body is shivering and you can’t get enough at the same time. You don’t even think about it when you lower yourself willingly, helping him along as he keeps going and going and going… until his hips are flushed against yours and you’ve never felt so full before.
“Holy shit, you feel… you feel… Oh, goddess,” you moan as he wiggles his hips experimentally, making you see stars.
“You feel incredible my mate,” he whispers against your ear, grunting when he thrusts in and out for the first time. “You are so tight. So warm, so wet…” His words make no sense but you don’t fucking care.
He starts a rapid pace that drives you to the brink of orgasm in a rush. Your bodies dancing against the other, slippery because of his skin and the water clinging to your skin. It’s fast and desperate, hard and exhilarating, and before you realize your body is seizing around him as he lets out a series of curses in a language you don’t understand and you feel his come hitting you deep, hot as molten lava and sending aftershocks of pleasure down your spine.
You breath hard for a few minutes, his own labored breath matching as you come down from the most amazing orgasm of your life. Your body is still trembling when he pulls his head away from your neck and stares into your eyes, a smug smile curving his wide mouth.
“Well, hello there,” you say looking at him with the biggest smile possible.
“Nice to meet you, my mate,” he tells you, making you giggle as he walks with you impaled on his dick until you are back in the water. “Ready to join your forever family?”
You can only nod.
