Work Text:
Eijiro was happy as a clam in his room after classes were over that day; he was all little, he could be alone, the temperature was just right, he had his teether (RAINBOW FISHIE), and he was comfy wearing nothing but his orange boxers. He’d just cleaned the floor so he threw his rubber fishie across his room and chased after it, pretending he was swimming around an underwater shark nursery. Like a humongous tidal pool! Or a reeeeally small baby shark. The kind sea anemones ate for breakfast! NOM!
He pounced on his fishie, giving it a mighty crunch between his sharp teeth before trying to rip the back half from the front. He never succeeded, but he judged it good to show the little fish in his domain he could if he really set his mind to it! He gnawed on it for a few seconds before flinging the fish across the room and racing after it once more. The fish bounced off the door and landed on the floor.
He’d just pounced on his nefarious prey when the door swung open and Izuku stepped into the room with a wave.
Eijiro tumbled backwards onto his butt and froze.
“Oh, hey, Kirishima! I just came by about the Basic Training homework. How are you?” Izuku said, all calm and normal and Big.
He couldn’t make words happen--Eijiro’s confidence crumbled in his chest. He shrank down on the floor and his chew toy tumbled out of his mouth.
In the growing silence, Izuku blinked curiously at him. “Are you…okay?” His green eyes slid this way and that around Eijiro’s room, taking in that he was almost naked, that he was crawling around on his dorm room floor, that he had a kid’s toy in his mouth. A pacifier sat proudly on the dresser right beside Izuku's shoulder.
Eijiro watched with mounting horror as Izuku’s green eyes took in the paci too.
Was he gonna laugh? Was he gonna make fun of him and go tell the others? An awful flush of shame spread over Eijiro’s chest. Eijiro crawled backwards, into the corner.
“Kirishima?”
Eijiro sobbed; two tears rolled down his cheeks.
Izuku closed the door behind him and knelt before Eijiro. Eijiro wrapped his arms around his head to block him out.
“You know, Kiri,” Izuku murmured, his voice all warm and sweet and loving, “I hear baby sharks have special teeth. They’ve always gotta have something to teethe on, right? Look!”
Izuku picked up the fishie and offered it to him, blatant and bright in his hand.
Oh…?
“You wanna nibble, lil’ shark?”
…Yis… Yispls. Cautiously, Eijiro let his arms down.
“Shhhhhh,” Izuku soothed, one of his smiles of pure kindness adorning his face. That got Eijiro’s heart hammering in a good way. “Are you a baby shark or a baby piranha? They’re both very cute, just like you!”
Huh?? Eijiro gaped at him. Suddenly the air didn't feel chilly anymore.
“It’s okay to be a little baby fishie at U.A.! It’s even okay to be a piranha or a shark or an orca! And they are just the most adorable apex predators out there, you know!”
Oh!! Eijiro squirmed; he wanted to be adorable!
“C’mere, you want your fishie? I can give it to you, sweetheart, it’s all right…”
Izuku slowly held it out to him; Eijiro took the rubber fish back between his teeth. He gave it an experimental chew, gnawing more on the possibility that was unfolding itself than his toy.
“I’m guessing…” Izuku tilted his head as he looked at him. “I’m guessing even baby fishies don’t like sitting on a cold floor, do they? I can help you to bed! Come on!”
Izuku held out his hands to him and Eijiro took them without thinking, but as he rolled onto his feet he slipped and crashed back down onto the floor. His legs flew wide in the collision and It bounced against his inner thigh, and he knew from the mirror behind Izuku’s slippered feet that it was Hard to miss. Oops…
Shyly, Eijiro peeked up at Izuku from beneath his eyelashes. His chest loosened up at the gentle smile he found still living amidst those friendly freckles.
“Hey, baby! It’s okay to have feelings,” Izuku said, his voice suddenly syrupy-soft. “But you look cold! Little babies shouldn’t go around naked, huh? You want a blankie? Daddy’ll get you a blankie, c’mon!”
He extended his hand again and Eijiro took it with a combination of eagerness and desperation. He wasn’t passing this up! Izuku rolled Eijiro onto his lap and then up into his arms as he stood.
But then a thought occurred to Eijiro.
“Shark!” Eijiro bleated at Izuku. He hoped he’d understand.
“Shark?” Izuku chirped back at him. “Are you my little baby shark? Then we’ve got to get you baby shark pajamas, huh?”
A bright blush spread over Eijiro’s face as he settled into Izuku’s hold.
Yispls!
~
The wonders of Izuku didn’t stop there, oh no! He ran a bath for Eijiro in his little attached bathroom, deposited him into the tub, and let him be a fishie! The most vicious one of all! A piranha!!!!
Izuku had his combat gloves on plus a fluffy towel wrapped around his fingers for armor. He dangled these defended digits very enticingly over Eijiro’s pond. And every so often…
The bathwater exploded as Eijiro burst out and captured the wiggling fingers in his mighty jaws! Eijiro crashed back down into the basin, spilling water everywhere, and tugged viciously at his prize this way and that, really gnawing the poo out of ‘em, crunching the bones between his teeth! Vicious, vicious hunter! He growled and flailed with his prey.
“You’re such a good piranha! Yes you are! Yes you are!!” Izuku sang.
Eijiro lit up at that. He grinned up at his soaked Izuku, his battered and bandaged fingers still trapped between his jagged chompers.
~
Izuku cleaned all the gel out of Eijiro’s hair with gentle and patient hands. When he was done, Eijiro's red hair was plastered down over his’s eyes and down to his jaw, which Izuku only giggled at, and giggled more when Eijiro shook his head like a wet dog. Izuku hauled him out of the bath and dried him with a fluffy towel, doing all the work himself and allowing Eijiro to be catered to and just shiver on the bathmat. But then all that remained to dry were his soaked trunks.
Izuku looked up at him from his crouched position. “You want these off, baby shark?” he asked.
Eijiro flushed, nervous. But…Crimson Riot said you gotta be brave, right? Okies…
He nodded. Izuku nodded back at him and slipped the trunks down to the floor.
Eijiro’s erection sprang out, bobbing precariously close to Izuku’s face, but Izuku made no comment. Instead, he drew the towel over all Eijiro’s exposed parts and just got them dry.
Then he--then he--it was great!
Izuku picked him up bridal-style and carried him to his bed--
WHERE HE TUCKED!!! HIM!!! IN!!!!!!!
“So you don’t become a frozen fish fillet while I find your jimjams, alright?” Izuku said. He started towards Eijiro’s dresser. “Where d’you keep them, lil’ fish? Hmm…”
Vibrating on his mattress, Eijiro squeezed his comforter between his hands as he watched him, wondering if he’d find them, wondering if he’d give up, wondering if he’d praise Eijiro or tell him he was wrong for being this way. He reeeeeeally hoped not the last one, this was so good!
“Not in here…not in here either…where…aha!” Izuku spun around with some blue footed pajamas with sharks and life preservers on them. “Do these meet your fishie needs, baby?”
YESS!!! Eijiro nodded with his whole body, looking like he was about to give himself a concussion with each rock back and forth.
Izuku laughed and brought the jimjams over. “All right, all right, honey, don’t get too excited. Do you wear undies under these?”
Eijiro shook his head vigorously. Wheee!
“Okay, then give me a leg,” Izuku said. “Now this other one… Now we’re gonna shimmy, okay? Shimmy shimmy shimmy, up up up…good sharkling! Now this arm, aaaand… All done!”
He zipped him up, his hands nimbly avoiding the swollen bit hanging around the base of the zipper path. It wouldn’t go awayyy; Izuku was too pretty and shiny… It wasn’t Eijiro’s fault, it wasn’t…
Izuku gave him the briefest tickle under the arms and tucked him back into bed. Eijiro couldn’t lie down, he had to sit up! He had to keep ogling this newcomer in his space, afraid he’d lose him if he blinked. Meanwhile, Izuku faced away as he took off his drenched clothes. He had to take off so many it made Eijiro feel guilty… Would Izuku like his Big clothes? Did he want to give Izuku his Big clothes?
Izuku went back into the bathroom to wring out his gloves, leg warmers, socks, and shirt over the sink. He placed them under the bathroom fan and put his damp shirt back on before returning to Eijiro’s bedside.
“I don’t know what your bedtime is, baby,” Izuku said. He rested his elbows on Eijiro’s mattress and his chin on his hands. “And I don’t really know if this is what you want. It’s only six in the evening…”
Fortunately, Eijiro’s body spoke for him: his stomach released an audible growl.
Izuku’s face brightened. “Hey, do you have any food you want? You want me to feed you, baby shark?”
A blush of embarrassment and excitement flooded Eijiro’s cheeks. Slowly, he nodded as he wriggled the comforter higher up over his chest. Was Izuku the kind of Big fish that fed its young…or ate them…?
Izuku turned his face about the room, looking for anything likely. He got to his feet and padded over to the mini fridge. He opened it--Eijiro had to cover his face in his hands, he couldn’t bear to look--
“Oooh,” Izuku said. “I see now.”
Eijiro peeked out between his fingers. Izuku was turning the baby bottle over in his hands. Then he grabbed the container of milk from the fridge and poured it into the bottle. He placed the filled bottle into the microwave and hit 50 seconds, tucking the milk carton back where it belonged while he waited.
Eijiro put his head under his covers. It took a really, reeeeeally long time, his tummy shivery and jumpy all the while. He looked down at his muscled thighs in that position, not really anywhere else to look. He didn’t look right--so thick and big and stiff and strong--or did he? Was Zuku okay with him looking this way when he was like this?
“Hey, honey!”
Eijiro jumped, yanking the comforter down off his head to find Zuku sitting on the edge of his mattress, testing the temperature of the bottle against his inner wrist.
“It’s ready now, baby,” he said kindly. Still, Eijiro shrank beneath his covers.
“Shhhh! Sh-sh-shhh, honey,” Zuku murmured, his hand coming around to cup the back of Eijiro’s head. “Honey... Where’d my big, rambunctious king piranha go, huh? Shhhh…”
He ran his fingers so nicely through Eijiro’s hair that Eijiro had to lean into the touch. He slowly let the covers come back down.
“It’s all right, baby. It’s okay…I’m here because I wanna be, okay? Now, there’s a little fishie who needs his bottle or else he can’t grow up big and strong. You wanna be my strong baby shark, right?”
Eijiro breathed easier now, a smile and a blush growing in tandem on his face. Looking up at Zuku from beneath his eyelashes, he nodded against his palm.
“Okay, baby!” Zuku said. He grabbed Eijiro and spun him so his shoulders and head were resting on his lap.
Skin prickles; Eijiro shivered in excitement. He was growing again Down There but he was a little more confident Zuku wouldn’t tease him for it now. He folded his hands against his chest and looked up at Zuku as he petted his cheek.
“You ready now, sharkling?” Zuku murmured, resting the bottle on Eijiro’s shoulder. “You let me know if you wanna stop, okay my lil’ tadpole?”
Eijiro gaped at him. Tadpole…?
With one violent lurching motion, Eijiro dragged himself farther onto Zuku’s lap and hooked his knees behind his back. He fisted his hands in Zuku’s shirt, tugging the fabric so much Zuku was forced to bend over him. That’s just what he craved: for Izuku to engulf him like the ocean. He couldn’t let this person go.
“Shhhh…I’m here, baby shark, I’m here…”
Are my teeth too big?? He ached to know. Are they too sharp for a tadpole? He kicked his feet in the sheets in his nervousness.
“That’s it, c’mere… C’mere, baby, drink your bottle…”
The nipple tapped lightly at Eijiro’s lips. Stomach tensing, he gazed up at Zuku. He’d be his first to give him his bottle…
He opened his mouth and Zuku pressed the nipple between his teeth. Eijiro watched Izuku's face and, judging the welcoming smile there was truly, really, really-real, he began to suck.
“Good boy!!” Zu’s voice was all warmth. Tummy-knot-untying warmth. And love, and praise, and welcome. His fingers were back in Eijiro’s hair, stroking rhythmically. Eijiro’s eyelids drooped and he sagged completely onto Zu’s lap, letting him fully support him.
The nipple felt right in his mouth, softly butting against the insides of his lips with each suck. Droplets of milk came out and slowly filled his mouth with warm familiarity. This warmth spread downward to his core with each swallow and then his tummy was fuzzy and warm too. Zu petted his hair and his shoulders and Eijiro didn’t have to be breaking his back to become Red Riot after his lifelong hero anymore. He was a little shark-boy with his watchful guardian stingray in his underwater nursery. Like a really big tidal pool! Or a really small stingray…
“Did you know I’m proud of you? Shhhhhhh, there’s my baby…that’s my good fishie…”
Now he was warm everywhere inside too… He tingled and he buzzed, and all that tingling and buzzing got bigger and louder each time Zu hushed him.
“Sh-sh-shhhhh…that’s right. That’s just right, tadpole. You’re just the right size for a tadpole, did you know? Did you?”
Eijiro paused his meal to giggle. He nuzzled into Zu’s thigh.
Zu clucked his tongue. “You’re so cute, baby shark… And what a good appetite you have! You’re gonna be the biggest, strongest piranha ever, I just know it!”
Zu shifted, bending over at the waist, and dropped a kiss into Eijiro’s hair. He sat back up as a wobbly smile stretched across Eijiro’s face. Eijiro kicked his feet in the sheets, now giddy.
“But today we’re mastering the bottle and a nap!” Zu declared.
Eijiro closed his eyes. Everything was just right…
“Oops…you finished that bottle quickly, honey. You want another? C’mon, I’ll feed you all you need…”
But when he tried to rise to get another bottle, Eijiro cinched his arms around Zu's knees so he couldn’t take a step. Eijiro pouted up at Zu and Zu blinked down at him.
“Ohh! It’s all right, baby! I’m just going over there… Not good enough, huh? That’s all right, I’ll just carry you.”
Stunning Eijiro, Zu kneeled and slid his hands beneath Eijiro's shoulders.
“You, little tadpole, have the very important job of holding this empty bottle for me! You got it? Is it safe in your little fins? All right…one, two, three, UPSIES!”
Eijiro was in love.