Chapter Text
It had been a month.
A month of traveling with Shigaraki, of staying with him. The two of them were always laughing with one another, making snarky remarks. They would hunt down sharks and dolphins, and just anything they could get their teeth into. Izuku really liked hunting with Shigaraki. It just felt...natural. Hunting with the other mermaid made him feel content.
It still felt kind of weird though.
Back in the reef, Izuku would have never hunted animals in the manner that he does now. He would have hunted them with stone spears and coral-made weapons. He would have set up traps and poisoned them with pufferfish. Izuku wouldn’t have torn them apart, his teeth digging into them. Even his nails seemed sharper and deadlier these days, and Izuku felt...felt stronger. Being with the other mermaid was making him more confident.
Shigaraki, however, just kept telling Izuku that he was a siren and not a mermaid. Mermaids were content living in coral reefs and staying in warm water, but sirens were not. Shigaraki just kept telling him over and over again that he was finally tapping into his siren ancestry—his true nature.
Izuku was finally doing what he was supposed to be doing.
Shigaraki’s words, however, did make a little bit of sense. He felt really different nowadays, and Izuku never really looked like the other mermaids to begin with. Maybe...maybe he really was a siren.
Together the two of them continued to hunt down marine animals, enjoying their blubber and fat. Shigaraki even started eying some fishing boats, glaring at the humans on deck, but Izuku managed to pull him away. Izuku couldn’t attack a human, he just couldn’t. He felt like if he did that, there would truly be no turning back.
Even though Izuku was slowly accepting the reality that he could be a siren, he couldn’t attack an innocent human. It would just be wrong. Whenever Izuku began ranting about how they should leave the humans alone, however, Shigaraki was sliding up next to him, and Izuku was losing his breath.
It felt like Shigaraki was always touching Izuku nowadays, intertwining their tails together. The older mermaid would reach out and grab Izuku with his hands, massaging his skin, and Izuku’s heart would skip a beat. His body would rub up against him, and the two of them would rock their tails against one another. The sensation of their tails intertwining always made Izuku feel lightheaded and warm, and the feeling was...it was r eally nice.
Izuku didn’t really get what the older mermaid was doing to him, but he liked it.
The bite mark that Shigaraki had given him a month ago, however, didn’t end up fully healing—the mark, actually, ended up scarring. Izuku now had a permanent bite mark on his neck. The desire to bite into Shigaraki’s skin, to give him a matching mark, was also incredibly strong. Izuku wanted to nibble on Shigaraki’s collar bones, to slide his tongue over his flesh, to dig his teeth into his neck, and...and…
These feelings were really confusing. Izuku didn’t understand them—they didn’t seem logical. Why would anyone want to chew on someone else's neck? Did he want to eat Shigaraki or something? It also didn’t help that Shigaraki was constantly showering him with attention and gifts.
The mermaid would hunt down fish for him, and preen smugly whenever Izuku ate them. He began finding and cracking oysters apart—digging around in their gooey insides for pearls. When Shigaraki finally had enough pearls, he ended up making Izuku a bracelet full of the white and pink balls. The gift was really thoughtful.
After that, Shigaraki began giving Izuku pretty sea-shells he found, and he even made him a dagger out of red coral. Izuku didn’t know where Shigaraki could have gotten the coral from since they were out in the open ocean, but he did appreciate the gift.
Shigaraki was just constantly flooding Izuku with attention and gifts, never leaving his side for a minute. Izuku would be lying, however, if he said he didn’t like it. After being ostracised in the coral reef for his entire life, the constant positive attention and energy was nice. It was really nice.
Sometimes Shigaraki would dance around Izuku, his fins flaring up, and Izuku would just watch him quietly—his face slightly confused. He didn’t understand why the mermaid would sometimes start to dance and swim around him, his eyes shining darkly, but Izuku did like his dances. They were very pretty.
Whenever Izuku started dancing alongside Shigaraki, however, the other mermaid would immediately crowd into Izuku’s space and he would get overwhelmed. Shigaraki would intertwine their tails together, wrap his arms around him, and Izuku would start to panic at the sudden change. That's how Izuku learned not to join in on Shigaraki’s dancing unless he wanted the other mermaid to be swimming all over him—touching him.
Shigaraki’s most recent gift, however, was a beautiful sea lion skin blanket. The two of them have been tracking an orca whale for quite a while now, and they ended up encountering some sea lions on their path. It looked like the orca whale had taken a break to munch on the blubbery mammals, and Shigaraki ended up snatching a sea lion for himself.
The mermaid, however, had turned the sea lion’s skin into a beautiful pelt. Izuku never took the skin blanket off, and he always kept it wrapped around himself. It was one of Shigaraki’s best gifts. The red coral dagger was also a pretty neat gift—it reminded him of the corals back from his home. The pink and white pearl bracelet was also very pretty, and it always sparkled beautifully in the water.
After a few days of tracking the orca whale down, however, they had finally caught up to the mammal. Izuku wasn’t thrilled about fighting a whale, but Shigaraki was practically vibrating with excitement. The older mermaid was ecstatic about this opportunity.
“Come on, Izuku.” Shigaraki mumbled into his ear, his lips brushing up against him. “Let’s kill this thing.”
Izuku could feel Shigaraki’s lips moving over the shell of his ear, and Izuku was shuddering softly. The other mermaid’s touch felt so good. Then again...should he refer to him as a siren now? Izuku was pretty sure that Shigaraki was telling the truth about the whole siren thing. He didn’t really feel like a ‘mermaid’ anymore now that he was out in the open ocean.
“We need to be careful.” Izuku replied, his voice barely a whisper. “An orca whale is going to be...it’s going to be tough. We’ve never fought something that big before.”
Moving in closer, Izuku began rubbing his face up against Shigaraki’s chest. “I don’t want either of us to get hurt.”
Immediately, Shigaraki was wrapping his arms around Izuku and rubbing his cheek against the top of Izuku’s head. “We’ll be safe, I promise. I’ll keep you safe myself, Izuku.”
The two of them then began intertwining the tails together, and Izuku was sighing breathlessly. The feeling of their tails rocking together was enough to make Izuku hot and excited. Even as the cold ocean water moved around them, Izuku could feel his blood pumping through his veins.
For a brief moment, however, Izuku thought he felt something hard and long poke at his scales, but it was gone a moment later. With his eyelashes fluttering, Izuku buried his face into Shigaraki’s neck. The mer-siren’s scent was strongest here, and Izuku could smell the scent of smoke coming off of Shigaraki.
With a reluctant sigh, Izuku was pulling away from Shigaraki, unentwining their tails. If the two of them kept rocking their bodies together, their tails sliding against one another, Izuku was going to bite into Shigaraki’s neck. The urge to bite the other mer-siren was always strongest when the two of them were close together.
“Now then,” Izuku smiled, his face soft, “let’s go get that orca whale.”
With that, Shigaraki and Izuku were swimming off—following the whale.
Hopefully the hunt would end up going well.
The hunt went well.
After fighting the orca whale for almost an hour, they managed to kill the beast. It had taken a lot of energy and strength, as the whale was much larger than them, but they had defeated it in the end. They were both exhausted, though. Hunting down an orca whale, of all things, wasn’t easy.
Orca whales were nasty little creatures, and they would kill anything if given the chance too. Luckily, neither Shigaraki or Izuku gave it that chance. The orca whale was dead, and they got to dine on its flesh, blood, and blubber. It was the perfect victory for them.
Yet even though they had won the fight, they were both still pretty exhausted.
With a tired yawn, Izuku was settling down onto the stone formation Shigaraki had found for them. The area was made out of grey stone, smoothed out by the ocean water, and the structure of the stone hid them from any predators. It was the perfect place for them to rest and regain their strength.
Shigaraki was already asleep, but Izuku, however, was still struggling to sleep on the stone. Even though the stone was smooth and flawless, it was still as hard as steel. His sore, bruised body didn’t want to rest on the hard stone.
Glancing over his shoulder, Izuku couldn’t help but stare at Shigaraki a little bit. The other siren would be much softer than the ground, after all. With his fingers twitching nervously, Izuku swam over to Shigaraki and began sleeping on top of him. The other mermaid was big enough that Izuku could cuddle on top of him comfortably.
With a soft sigh, Izuku was nuzzling his face into the crook of Shigaraki’s neck—enjoying the heat that was emanating off of the older siren. However, after a few minutes of cuddling, Izuku's hands began to wander. He began running his hands over Shigaraki’s muscular chest, his abs, his strong arms, and every other part of him.
Shigaraki ‘s form was somehow both muscular and lithe, and Izuku liked it quite a lot. The body fit the grumpy siren. Humming quietly under his breath, Izuku began running his hands over Shigaraki’s tail—feeling his scales. His fingers, however, ended up snagging on a strange part of the siren’s tail.
Huh.
It looked like there was an indent on Shigaraki’s tail.
Immediately Izuku was rearing up, his eyes widening in horror. Oh no, oh no, oh no! Shigaraki must have gotten hurt without him realizing it! The other siren was hurt, hiding an injury from him, and Izuku didn’t even realize it!
Without a moment of hesitation, Izuku was getting up off of Shigaraki, so he could look at the siren’s ‘indent’ properly. It looked like some kind of shallow stab wound, but Izuku couldn’t see any blood coming off of it. Leaning in closer, Izuku poked his tongue out and licked the indent—hoping to see if he could taste any blood from the wound. Yet as Izuku timidly licked at the wound, he couldn’t taste any blood.
Okay, that was good. The wound wasn’t bleeding which meant it couldn’t be serious.
With that, Izuku began pressing a finger into Shigaraki’s ‘indent’—trying to see if the inside was torn up and in need of care. The inside felt wet and sticky, but not like it was in any immediate distress. The skin seemed to all be together, and Izuku couldn’t feel any open wounds. Yet as Izuku slipped a second finger into Shigaraki, opening him up some more, he could feel something large brushing up against his fingers.
What was that—
Izuku’s train of thought, however, was then cut off, as Shigaraki’s dick bounced out and hit him in the face with a loud bonk. Immediately Izuku’s brain was shutting down, as Shigaraki’s cock rubbed up against his cheek—moving across his face. Small drops of precum were budding at the tip of Shigaraki’s dick, and disappearing into the water.
Oh.
Oh .
Izuku felt like an idiot, a complete idiot. Of course, the indent was just Shigaraki’s dick. God...Izuku was such an idiot! The two of them had the same biology—how could Izuku make that mistake?! Groaning loudly in humiliation, Izuku curled in on himself as Shigaraki’s dick continued to bob around in the water. This was so embarrassing; Izuku was an idiot.
“Yeah, you are.”
Whipping up his head, Izuku then saw that Shigaraki was wide awake and that he was staring at Izuku intensely—his red eyes practically glowing. Immediately Izuku was curling even further in on himself, his heart rate skyrocketing.
“I-I’m sorry! I didn’t know that...that you...I thought you were hurt! I thought you got stabbed or hurt by the whale, and that you were hiding an injury from me! I-I would never…”
Shigaraki, however, just continued to stare at Izuku intensely, his red eyes boring into him, and Izuku was blushing. The other siren’s gaze was so intense, and Izuku felt so weak. He messed up, he messed up and now he was going to die. Shigaraki was going to tear him apart.
“Your mumbling is really cute, Izuku.” Shigaraki purred, his voice cutting Izuku’s negative thoughts off. “You always mumble under your breath like a madman; it’s really charming.”
“I...I…” Izuku stammered, his voice giving out. Shigaraki was going to kill him, and...and…
Did Shigaraki just call him cute?
Immediately Shigaraki was swimming in closer to Izuku, his eyes half lidded. “You’re such an idiot, Izuku, but you’re my idiot. My dumb little siren. You need me to take care of you, don’t you? You lived your entire life thinking you were a mermaid, and now look at you.”
Shigaraki then began circling around Izuku, his tail brushing up against him. “You can't tell the difference between romance and friendship. Mermaid mating rituals have completely ruined you. Now when someone is performing a siren mating ritual, giving you siren courting gifts, courting dances, you don’t even realize it. Those mermaids blinded you."
Shigaraki, however, then began chuckling softly, his voice amused. “I spent so much time courting you, performing mating dances for you, and you just decided to start touching me while I was sleeping. You just skipped right ahead to the fun part by accident.”
“Were…” Izuku blushed, “were you awake the entire time...or...or did I wake you up?”
“I was awake.”
With a soft groan, Izuku was burying his face into his hands—a dark pink blush creeping up past his neck. Izuku was such an idiot, he was so dumb. Glancing up timidly, Izuku’s body began shaking nervously as he met the older siren’s gaze. “M-Mating rituals...you said...you said you were trying to do that...with me?”
Immediately a large smirk was stretching across Shigaraki’s face, and he began stalking closer to Izuku—a feral glint in his eyes. “I want to fuck you, Izuku. I want to make you my mate. I’m gonna teach you how to be a siren.”
Before Izuku could even speak up, however, Shigaraki was tackling Izuku down to the smooth stone and biting into his neck—right over his scarred bite mark. With a loud gasp, Izuku was throwing his head back, his thoughts pausing, as Shigaraki ravaged his neck. He could feel the siren biting into his skin, marking him, but he could also feel the siren licking him. Shigaraki was licking him softly and carefully, and Izuku could just feel the love pouring out of the older siren.
The other siren then wrapped his tail around Izuku, and Izuku’s heart rate was picking up. The sensation of their tails rubbing against one another was as heavenly as usual, and Izuku began panting breathlessly as Shigaraki tightened his grip around him.
Shigaraki then released Izuku’s neck and began whispering into his ear. “Do you want me to perform another dance for you?”
“Or…” Shigaraki purred, his voice trailing off, “or would you like to get to the fun part?”
Shigaraki’s dick then began poking at Izuku’s scales, and Izuku was whining loudly—his red face practically steaming. The feeling of their tails moving together, of Shigaraki’s dick rubbing up against him, was too much for Izuku and he felt like he was about to explode.
Wrapping his arms around Shigaraki, Izuku began clinging onto the other mermaid desperately—his nails digging into his skin. His entire body felt hot and tingly, and his navel was tightening in a pleasurable way. Izuku wanted Shigaraki to go further, for the siren to maul him, but he didn’t know how to ask for it.
With tears shining in his eyes, Izuku nuzzled his face into the crook of Shigaraki’s neck and began nibbling on his collarbones—his tongue sliding over him. Slowly Izuku opened up his mouth, his fangs peaking out. Izuku didn’t know how he was supposed to do this. How should a siren bite another siren? Should he just chomp down on him or was there some kind of etiquette?
Gulping audibly, Izuku moved in closer to the other mermaid and began licking at his neck timidly. Izuku then continued to give small weak licks and kisses to Shigaraki’s neck—unsure of whether or not it was okay for him to bite him. Shigaraki’s skin tasted salty on his tongue, but that was to be expected; they were in the ocean after all.
“Fuuuuck…” Shigaraki groaned, his voice hoarse, “you're so damn cute! It’s okay, Izuku, you can bite into me. Taste me. You can do it.”
Reluctantly Izuku opened up his mouth wider and began nibbling on Shigaraki’s neck with more confidence. He still wasn’t biting down and breaking his skin, but his little nips were more determined now.
“Come on, baby, you can do it. Bite me, Izuku!” Shigaraki hissed out between his teeth, his grip around Izuku tightening. Shigaraki then began rolling their tails against one another roughly, and Izuku’s eyes were rolling back into his head.
With a silent moan, Izuku was biting down onto Shigaraki’s neck and the siren’s blood was filling up his mouth. Shigaraki’s blood tasted like—well—blood. The taste of iron was heavy in his mouth, and Izuku couldn’t help but drink a little bit of it. Ever since Izuku started doing ‘siren stuff’, he had a greater appreciation for the taste of blood.
Reluctantly, Izuku moved away from Shigaraki’s neck. He wanted to keep biting the other mermaid, he wanted to taste him—
With a low guttural groan, Izuku was licking at his lips—savouring the taste of Shigaraki’s blood. Immediately Shigaraki was running his fingers through Izuku’s hair, tugging on his green curls reassuringly. “You did amazing, Izuku. Now we’re going to be together forever. We’re mates now.”
Okay, Izuku actually knew about the concept of mates, as mermaids had mates as well.
He wasn’t confused about something for once.
Glancing down at Shigaraki’s neck, Izuku then couldn’t help but stare at the siren’s bleeding bite mark. Small droplets of blood were forming on the wound and disappearing into the ocean’s water—creating small red misty trails. Leaning forward, Izuku’s tongue then peaked out of his mouth and began licking at the bite mark—lapping up the blood.
Purring softly, Izuku nuzzled in closer to his mate—desperate to comfort him. With a loud growl, Shigaraki’s grip around Izuku was tightening—his red eyes practically glowing. “You’re so sweet, Izuku, so cute. My perfect little mate. You’ll look even more perfect writhing on my cock.”
With that, Shigaraki’s dick was poking at Izuku’s scales, at the part of him that had a slit, and sliding inside of him. Throwing his head back, Izuku began groaning loudly as Shigaraki’s cock bottomed out in him. He...everything about this felt so weird…
His insides felt wet in a way they had never been wet before, and Shigaraki’s cock just felt so big. It felt like the siren was stretching out his insides, molding him to his cock.
“Thanks, Izuku.” Shigaraki chuckled, his face amused. “Your praise means a lot to me.”
Oh.
Izuku must have been mumbling out loud again.
Before Izuku could start stuttering loudly in embarrassment, however, Shigaraki was moving inside of him. Immediately, Izuku was gasping breathlessly—his mouth open in a silent scream. Shigaraki’s cock was pounding in and out of him, and the sound of splashing water was loud in Izuku’s ears. With every thrust, Shigaraki was hitting a sensitive spot inside of Izuku, and Izuku was seeing stars. He could feel Shigaraki’s cock dragging against his insides, and Izuku wanted to cry. His entire body felt hot and tingly, and just so good .
Mumbling incoherently under his breath, Izuku’s eyes began rolling back into his head as Shigaraki continued to slam his cock into him. Izuku could feel drool spilling out of his mouth, disappearing into the ocean, as Shigaraki clawed at his sides and thrusted into him.
With a loud moan, Izuku was digging his nails into Shigaraki’s back—leaving angry red lines in his wake. With every thrust, Izuku’s navel was tightening a bit more—and Izuku was sure he could feel his mind unraveling. Desperately Izuku began moaning eagerly, his tongue lolling out of his mouth as Shigaraki continued to fuck him.
“Fuck!” Shigaraki hissed out, his eyes narrowed. “You’re so fucking wet! Your hole is sucking me back in with every thrust. Do you like my cock that much, Izuku? Do you want me to breed you? To fill you up with my eggs?”
A wave of heat then crashed over Izuku at the mention of breeding, and he was nodding eagerly—not even understanding what he was agreeing to. “Yes! I want your babies, Shig-Shigah! Stuff me full! I want you to fill me up with your cum, with your babies! Please fuck me, oh god, I want your eggs! Please make my insides wet!”
Izuku then began blubbering incoherently, his eyes rolling back into his head. Izuku’s cheeks were flushed a dark coral red, and a lazy smile was stretching across his face—his eyes vacant. “Want Shig-Shigah-Shigaraki! Want you so much! Love-love Shigaraki! Love...love-l-love—love so much!”
With a loud snarl, Shigaraki was picking up the pace and driving his cock into Izuku roughly—messing up his insides. “Say my name! Say you love me! I want to hear it all!”
“Love...love Shigah! Love, l-love, love you! Love Shig—love Tomurah! Tomura, Tomura, love you! Love, looove, Tomura!”
“Good boy, Izuku. You're being such a good boy for me!” Shigaraki groaned into his ear, and Izuku was shuddering. With his navel tightening, Izuku was coming on Shigaraki’s cock with a loud breathless moan—his eyes rolling back into his head. Shigaraki then came a few moments later, filling Izuku up to the brim with his cum.
Panting tiredly, the two of them slowly floated down to the stone floor—lying against one another tiredly. After fighting the orca whale, having sex just made them tired all over again and messed with their recovery.
With his eyes hazy and content, Izuku nuzzled into Shigarki’s chest—enjoying the feeling of the siren’s muscles pressed up against his face. Quietly, the two of them started to fall asleep against one another before Izuku reluctantly spoke up.
“Shigaraki?”
“Hm?”
“What...what are eggs? Did...did you put any eggs in me?!”
…
“Oh my god—”
With a loud sigh, Shigaraki was rubbing the bridge of his nose in annoyance—his eyebrows furrowed together. “You aren’t going to get pregnant, Izuku. I didn’t fill you up with any eggs. Oviposition is a whole thing—it’s different than sex.”
“A-Are you sure?” Izuku stammered, his eyes wide and unsure, and Shigaraki couldn’t help but chuckle at the innocent look on his face. Izuku was so adorable.
“Yes, I’m sure. I don’t even have any eggs I could give you right now. It’s not the right season for egging.”
With a smug smile growing on his face, Shigaraki was swimming closer to Izuku—bumping their shoulders together. “You know...in a few months...I could get you nice and pregnant if that’s what you want. You would look great, all nice and round with my babies.”
Immediately Izuku’s face was flushing an embarrassing lobster red, and he was stammering incoherently—his words slurring together into nonsense. “I-I mean—you—you can be—coral reef and—and pregnancy!”
“You are very coherent, my love.”
Burying his face into his hands, Izuku began groaning loudly in despair and embarrassment, his ears turning pink. “S-Sorry!”
“You have nothing to apologize for, Izuku. You’re adorable. My precious little pearl.” Shigaraki coolly replied, his face pleased.
Timidly, Izuku began peeking out at Shigaraki from in-between his fingers—his eyes curious. “B-Back in the coral reef...eggs weren't...weren’t a thing. You would get p-pregnant and give birth to an actual baby—just like a whale. Do sirens just...just…”
“Sirens have offspring with one another through the use of eggs, but mermaids actually get pregnant. Mermaids give birth to babies and then raise them until they are adults. Sirens, on the other hand, give birth to eggs and don’t raise the children. Mermaids will watch over their kids as they grow up, but sirens won’t do that. If we had some kids together, Izuku, we wouldn’t raise them.”
“T-That’s terrible!” Izuku gasped, his eyes horrified. “You can’t just abandon your children—”
“—It’s not really abandoning, Izuku. It’s just how sirens work. You only think it’s wrong because you grew up as a mermaid.”
Izuku then began murmuring madly under his breath, his hands covering his mouth. “The coral reef...I guess it makes sense for...eggs are...now I know why my mother left me…”
Reaching over, Shigaraki began ruffling Izuku’s hair—musing up his green curls. “We’re going to be arriving at our final destination soon. You’re going to get to meet my family. Sirens don’t usually travel in packs, since we’re solo predators, but my group and I are a bit of an exception.”
“Solo predators…” Izuku trailed off, his eyes narrowing as he thought over Shigaraki’s words.
“Yes, sirens are solo predators. Mermaids like to stay together in giant communities and colonies, but sirens aren’t like that. Sirens like to explore the open ocean alone. If a siren is traveling with someone, it’s usually their lifelong mate or a sibling. My group though, as I said, is an exception.”
Without a moment of hesitation, Izuku was grinning up at Shigaraki brightly, his face practically sparkling, and Shigaraki could feel his heart skipping a beat. “I can’t wait to meet your family, Tomura! I’m sure that we’ll all get along great!”
Izuku was adorable.
He was so cute.
Shigaraki was so glad he took him.
Suppressing a dumb smile, Shigaraki nodded in agreement—his face carefully blank. “Yes, I’m sure you’ll get along great. Now come on, let’s keep moving, we’re almost there.”
With that, the two of them were picking up the pace a little bit, and Izuku was chatting away happily. Whenever Izuku began mumbling away incoherently, his eyes shining as he murmured under his breath, Shigaraki wanted to fuck him. He wanted to stuff his blabbering mouth with his cock. Shigaraki wanted to turn Izuku into a drooling wet incoherent mess.
Izuku then continued to chat away noisily as they swam beside one another, and Shigaraki could feel his navel tightening with every word Izuku uttered. If they didn’t get to his family soon, Shigaraki was going to be fucking Izuku senseless again.
“Shiggy!”
They were here.
Before Shigaraki could even glance up, Toga was crashing into him and biting him on the nose. Rearing back—Shigaraki snarled loudly, his face angry. “Fuck, Toga! Get off of me!”
With a loud growl, Shigaraki was shoving the giggly blonde off of him. Toga, however, just immediately began crowding back into his space again—her face excited. “You’re finally back, Shiggy! We missed you so much!”
Dabi then began swimming towards them as well, his face bored. “It’s good to see that you’re back, you bastard. Toga has been bouncing everywhere and complaining non-stop in your absence. She’s been whiny.”
“I have not been whiny!” Toga pouted, her voice, in-fact, very whiny.
Dabi’s eyes, however, then trailed over to Izuku and he was raising his eyebrow up. “Oh? What’s this? Did you get us something to eat?”
The siren was being sarcastic, but his sarcasm seemed to fly over Izuku’s head, and Izuku’s face was paling—turning as white as a seashell. Without a moment of hesitation, Toga was swimming over towards Shigaraki’s mate and poking at his chubby cheeks. “He’s so cute and soft! Where did you manage to find this cutie, Shiggy? No one would want to go out with your ugly butt!”
Shigaraki was well aware that he wasn’t typically attractive. He had dry, rough skin, and his eyes were an intense red. His scales were also a bright shimmering white, and that put a lot of people off. A fish’s scales turned white when they were sick or dying, after all.
“That’s not true!” Izuku suddenly spoke up, his cheeks flushing pink. “Shigaraki is very attractive! He could get anyone he wanted!”
Immediately Toga was cooing loudly while swimming all over Izuku. “He’s so sweet! He’s cute and kind! What a deal!”
Before the teasing could continue, however, Shigaraki was speaking up. “Izuku is my lifelong mate—we’re bonded to one another. I don’t want to see or hear any of you doing anything to him, got it?”
With a loud groan, Toga and Dabi were mumbling in agreement—promising to not try anything with Shigaraki’s mate. With that, Shigaraki was swimming towards Dabi while Toga continued to pester Izuku with questions.
The two of them then swam further away from Izuku and Toga, so they couldn't be overheard.
“How are the others doing?” Shigaraki grunted, his face bored.
“They're doing fine.” Dabi replied, his face just as bored. “Everyone is eagerly awaiting your arrival back at the base. Compress needs to talk to you about something, but I don’t know what it is.”
Quietly, the two of them watched as Toga chased Izuku around in the water. They were playing together.
“I can’t believe you kidnapped that siren.” Dabi huffed, his voice amused. “You went through so much trouble for him.”
“I didn’t kidnap him!” Shigaraki grunted, rolling his eyes. “I was just in the right place at the right time.”
“Riiiight…” Dabi droned, his voice sarcastic. “You just stalked him for weeks, terrorized his reef, separated him from his home, and appeared conveniently next to him. You planned for all of this to happen.”
“It needed to be done. A siren shouldn’t be living with mermaids, it’s revolting. Even the lowliest siren is better than a mermaid. Besides, I’ve wanted him for years now. I just finally made my move.”
Quite a few years ago, when Shigaraki was a kid, he and the rest of his family stumbled across Izuku’s home—the coral reef. They didn’t interact with the mermaids at all, and they stayed out of sight.
Shigaraki, however, couldn’t help but take notice of a siren who was a few years younger than him, living with the mermaids. It was horrifying—it was intriguing. Why would a siren ever willingly live with a bunch of mermaids? Didn’t they understand that they were superior, that they were better?
Why would they want to stay in one coral reef for their entire life when they could explore the open ocean? It didn’t make sense. The little siren didn’t make sense to Shigaraki.
After that, every time Shigaraki and his family passed by the reef—Shigaraki would stalk Izuku, watching him from the shadows. Shigaraki got to see Izuku grow up, and he loved the little siren like he was an actual member of his family. He became completely enamoured with Izuku.
What started off as a curious interest, turned to lust, passion, and want. Shigaraki wanted Izuku so much it hurt. He wanted to show him the proper way to live. Shigaraki wanted to fill Izuku up with his cock, to make him wet. He wanted Izuku to forget about his old home, to only think about him.
With a smug smile stretching across his face, Shigaraki was watching Izuku’s interaction with Toga with lidded eyes. Everything was finally perfect. He had Izuku right where he wanted him.
Moving away from Dabi, Shigaraki gave his fellow siren a warning glare. “I don’t want you or anyone else saying anything to Izuku, got it? This is a fresh start for him. I don’t want him getting anxious because I killed that insipid guard and destroyed his home. He doesn’t need to think about them anymore. Izuku can just focus on me.”
“Whatever you say.”
Narrowing his eyes, Shigaraki growled one last time before swimming away to Izuku. With a soft smile dancing across his face, Shigaraki was pulling Izuku into his arms and kissing him sweetly. “Let’s go introduce you to the rest of my family, all right?”
“Okay, Tomura!” Izuku chirped, his face bright and carefree, and Shigaraki could feel his soul singing happily. Izuku was as bright as the sun, and as pure as a white pearl. He was perfect.
Finally, after all of this time, everything was going the way Shigaraki wanted it to.
Shigaraki had everything he wanted.