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Living in the tundra was a defiance against nature. The Bakugou and Midoriya tribes settled at the edge of the world and understood what it took to withstand the snowcapped mountains and ice-bitten lands. One of the first things Katsuki had ever learned was that getting wet could be a death sentence.
The ice had been too thin beneath his boots. Spring was approaching and it left the land in constant turmoil as to whether it wanted to be warm or cool, and the ice seemed to be in constant disagreement as well. It split beneath his foot, and even at five years old, Katsuki was too heavy for the ice.
He went through with a screech that was soon cut off by a gasp of shock. It was colder than anything he had felt before in his life, drenching him with dread and sinking all the way through his clothes.
Panic seized him, water slopping into his mouth, and he felt as dazed as he felt terrified. Then there were green eyes and a wide face. Warm hands gripped his flailing arm and pulled. He could scarcely remember what he did next - whether he helped to kick his body free out of the ice, or if Izuku had just pulled him out all on his own.
He was left with his torso on the ground, his legs in the water. Pulling him out too fast could put him into shock and both boys knew that. Izuku was talking to him in a frantic, wobbly tone, his eyes wet with alarmed tears, but he didn’t let go.
Katsuki kept trying to call him an idiot, kept trying to say anything at all, but his teeth kept chattering and his whole body was shivering all too violently for words to be of any use. Izuku finally pulled him the rest of the way out.
Katsuki wanted to tell him to knock it off with the tears already. He wasn’t dead and he wasn’t going to be anytime soon. Izuku had to stop looking at him like that, but Katsuki still couldn’t talk. Every time he so much as opened his mouth to breathe in, his lungs filled with hurt and a flaring agony that wrecked him with worse shivers than before.
Izuku cried out for something, but Katsuki was slipping away into a blurry darkness. The last thing he remembered were warm hands on his face and Izuku’s voice saying “Kacchan” again and again.
When he came to, he was swathed in warmth, his bared body pressed against Izuku’s equally exposed body, the two of them wrapped in a wool blanket and nestled up against Inko’s sheep. Inko was sitting across from them, humming softly as she brought a soup to a boil.
Katsuki faintly registered the pleasant scent of bone broth and rosemary before his head rolled over, face nestled into Izuku’s neck, and then he was asleep again. He was safe. He would be okay. Beneath the blankets, his hand was clasped so hard with Izuku’s that he would leave behind a bruise as a reminder of the day.
When he regained his strength and had hot soup poured down his throat, he felt embarrassed by his misstep. His mom was going to chew him out for such an amateur mistake later, but for now, he felt soothed by Inko’s relief that he was okay and comforted by Izuku’s persistent pressure against his side.
Later, once he was dried and dressed, his mother came to pick him up with a vengeance. His wolf pup greeted him with a lick to the face and a full body wriggle, but his mom smacked him right over the back of the head before yanking him into a hug.
“What the hell were you doing out on the lake anyway so close to spring?!” she chided him, pushing her hand through his hair again and again until finally he fought against her.
“I was goin’ fishing! Stop!” Once he got away from her, he rubbed his hand furiously against his nose, trying to hide the fact that he felt like crying.
“It was just bad luck.”
“It was stupidity,” Mitsuki corrected, “Plain and simple.”
She turned to Inko then and bowed deeply. “Thank you for saving him, Inko.”
“Oh, it wasn’t me. It was Izuku. He pulled him out and brought him here. Stayed with him all night.”
Mitsuki looked down at Izuku. Izuku’s eyes who were still round and wide with fear, clinging to his mom’s dress. Mitsuki’s gaze softened and she squatted down, tipping her head at him.
“You did a very brave thing, Izuku.” She reached her hand out, palm up. “Thank you for saving my idiotic son.”
“...He’s…” Izuku hesitated, sniffing, before he reached out to hold her hand. “He’s not dumb.”
Mitsuki snorted softly. “I think you might be a teensy bit biased there, kiddo.”
Izuku shook his head furiously, but said nothing more. The women stepped away from the boys, conferring in low voices over the crackling fire. Katsuki was rubbing his face to get rid of tears and the burn of embarrassment.
“You’re not dumb,” Izuku insisted quietly, his hands curled up into fists at his side. “You were brave.”
“It was a dumb mistake,” Katsuki grumbled.
“I checked the ice too. It should have been okay,” Izuku continued, “You’re not dumb.”
Katsuki looked up at Izuku to gauge if the boy was making fun of him, but all he saw was a shining determination. Izuku actually looked…kind of mad. Surprised by the sincerity, Katsuki gazed blankly at the other boy before a snort escaped him.
“You’re so weird, Deku.”
“Am not!”
“You are,” Katsuki said, stepping towards Izuku. He reached his hand out and gently pinched Izuku’s cheek, pulling at it. “You’re weird and it’s the best damn part about you.” He let go and marveled at how Izuku’s cheeks turned bright pink. It reminded him of the peonies that would spring up against the mountainside when the ground warmed up.
“Thanks,” he muttered eventually. His mother came back over to him, grabbing his hand.
“Thank you again,” Mitsuki said, both to Inko and Izuku, before pulling her son out of their hut and into the cold. His wolf bounced after them and they joined back up with Mitsuki. Katsuki kept looking back the entire way home.
His mother was silent the entire way back. When they got home, she told him to go to his room and rest.
It was a few days before his mother and father sat him down. They both had those serious looks on their face that always meant a grave conversation was coming.
“Katsuki,” his mother began, “How do you feel about Izuku?”
Katsuki folded his arms over his chest and scrunched himself down in his seat, looking over at the fire, his face starting to burn up. “He’s fine.”
“Just fine?” his father gently prodded.
“Yeah. Why?”
“Well,” Mitsuki shifted in her seat, glancing at her husband.
“Inko and I were talking and we wondered if perhaps it would be fitting for an arrangement between our families. Through marriage.”
It wasn’t uncommon. It was how his mother and father had married, after all. While arranged marriages were common among their tribes, it was hardly a matter of force. His mother had desperately wanted to marry his father and she had gone out of her way to convince not only her own parents, but his parents too that the arrangement would be beneficial to all involved.
Katsuki was just a boy though. He hadn’t thought hard about marriage, and frankly, he didn’t care all that much one way or another. He had always figured marriage was just something you did when you got older and then you spent the rest of your life with that person.
He thought about Izuku. Izuku’s wide eyes and that stubborn way he would follow Katsuki absolutely everywhere he went, doing anything he did even when it terrified Izuku or made him cry. He thought about how warm Izuku had been and how effortlessly Izuku had darted in to save him from drowning. From hypothermia.
He thought about every time Izuku had ever smiled at him and realized that if he got to marry Izuku, he would be able to spend the rest of his life making Izuku smile at him.
“All right,” he said at last, refusing to look at either of his parents. He knew they would have some embarrassing dumb look on their faces. “Only if it’s okay with him too.”
“Ah…That’s wonderful,” his father said, a smile evident in his voice.
“I will speak with Inko. She’s probably having the same conversation with Izuku now.”
It turned out to be true. Inko had actually sat Izuku down only two days after the incident and asked him the same thing. Apparently, Izuku hadn’t even let her finish her whole speech before he had shrieked “Yes!”
The little nerd. The next time they saw each other was stiff and formal. Their parents were both wearing their tribe’s cloaks and jewelry, serving as a representation of both, and they sat at a table with serious looks and serious words.
Katsuki and Izuku were dressed similarly, but the two boys sat across from one another, exchanging shy looks and a smile, once or twice, before everything was set in stone. They would be married by their fifteenth birthdays.
So life went on.
Katsuki and Izuku spent more time together. Katsuki learned how to take care of the sheep. He liked cleaning out their hooves and shearing them. He really liked taking care of the lambs and the noises they made. Izuku was great with the wolves. He liked to play with them and would coo obnoxiously over the puppies, no matter how many times Katsuki told him to knock it off.
Katsuki began to train his own pack of pups to herd sheep. Keep low. Keep them safe.
They grew. Seasons flickered through and the boys got into fights. Katsuki got angry any time he thought about Izuku being caught out on his own, being hurt. So they fought. They wrestled around on the ground, Katsuki pinning Izuku’s head down and snapping at him to get better already.
“You’re gonna be my husband,” Katsuki would say, “You need to be able to fight.”
“I can!” Izuku would snap back, wiggling under him, “You’re just big!”
It was true enough. As they grew, Katsuki put on weight. They both did. Being willowy and thin in their land may as well be a death sentence. Having a healthy amount of fat on your bones kept you warm, kept you safe.
Katsuki stacked out in his chest. Built up muscle in his arms, in his abdomen, all cushioned with a generous layer of plump. Izuku was stronger in his legs, his own hips and thighs thickening up with muscle and fat both. They balanced out. They grew up.
They grew into one another. Their fights became so perfectly balanced that it would be hours upon hours before they would come to a draw. Izuku was fast and relentless, and more often than not, he would get Katsuki pinned these days, always with a vicious, victorious grin, before he would proudly proclaim: “So, can your husband fight yet?”
And Katsuki would scowl up at him, his face warm and his body warmer.
“Ain’t my husband yet.”
Which would make Izuku grin wider, leaning over Katsuki, his eyes burning bright. “Am I good enough to be your husband then?”
They both knew the answer. Even without the arrangement, Izuku would be good enough to be husband in every damn life they met.
“Tch,” Katsuki grunted, shoving Izuku off, “You’re so embarrassing.”
“Maybe,” Izuku agreed, grinning, “But I’m right.”
“Fuckin’ embarrassing.” Katsuki climbed to his feet, brushing snow off his body. Izuku never stopped grinning until Katsuki shoved him over and Izuku exploded into laughter. Katsuki wouldn’t laugh with him, but he would bury his face into his own scarf to hide the blush and mild smile that would grow on his face.
He loved him.
He loved the way Izuku would laugh. He loved that Izuku was always catching him off guard. He loved the way that Izuku fit perfectly against his chest, his head just barely coming to his shoulders, and how Katsuki could press his face against his curls. He loved that he always smelled a bit earthy and wet like the sheep he worked with. He loved how rough and thick his hands were, the way that they felt holding Katsuki’s surprisingly softer hands.
Working with farm animals would do that to you, Katsuki supposed. He loved the way Izuku’s ass would jiggle whenever Izuku lifting a bundle of hay, and Katsuki liked to leer at him and whistle to get Izuku turning bright red and yelling at him to stop looking at him like that. He liked the way that he could just smirk at Izuku and send the other boy shrieking.
But most of all, he liked how when night fell, they would settle into a comfortable silence by a fire and the softest look of contentment would settle over Izuku’s face. He loved to watch him then, counting each and every freckle religiously, keeping track of them like he might the stars above, navigating from the one at the corner of Izuku’s eye right on down to the one by his mouth.
And there, Katsuki would kiss him, secretly, privately, before their marriage was cemented, and Izuku would smile in such a way that Katsuki wouldn’t stop kissing him until warm want was blooming in his chest. Izuku would break the moment, smiling and pushing Katsuki away, reminding him of their vows.
Katsuki would gather Izuku’s scarred hands into his own and kiss each fingertip, feeling warmth that went so much deeper than a fire could ever reach. Their marriage was only a week away and yet, it felt far too long.
“You’ve been mine my whole life,” Izuku teased him, “I think you can wait a little longer.”
“You’re always sayin’ stupid shit,” Katsuki mumbled, his mouth opening and closing against Izuku’s thumb. He looked at his betrothed, and something about his own gaze must have caught Izuku off guard, because Izuku made this soft, wondrous sound of breathlessness and then they were kissing again.
When their marriage came, Izuku was dressed in thick woven grays with an ornate fur cap. Katsuki was dressed in his own ornate coat, the material carefully stitched with leather shoulders and a red scarf knit by Izuku himself as a gesture of their bond.
Their first kiss as husbands was warm, their families applauding, and Katsuki’s wolves filled the night air with howls for nearly an hour. When they dined under the sky, strips of color spilled through the air and shed green and blue light down across the tundra.
“That’s a good omen,” his mother intoned, gazing in wonder at the northern lights, “It must mean you’re destined for one another.”
“Getting sappy on us, huh?” Katsuki teased his mom, but for once, she didn’t snap back. She just smiled, and truthfully, Katsuki couldn’t blame her. She was right.
He was destined for Izuku.
That night, he opened Izuku up beneath the sky and kissed him until Izuku’s body began to tremble and Katsuki thought back to that day in the water. He spread Izuku’s legs apart and massaged his fingers up between his legs, slick with oil, and he slid them inside of Izuku, that warm, tight hole and rubbed there too until Izuku was making the most stunning sounds.
“You’re perfect,” Katsuki mumbled, kissing away a tear from the corner of Izuku’s eyes, “You’re fuckin’ perfect.”
When Izuku was ready, Katsuki slid inside of him, and Izuku gasped, his hips rolling up off the ground and he squeezed Katsuki’s arms.
“Ka–Kacchan– you’re so–...!”
Katsuki pressed their mouths together and rocked against Izuku’s body again and again until they were both crying from the sheer pleasure of it all. When he came, he stayed inside of Izuku, relishing in the sensation of filling him up, and then after, he rolled them over so that Izuku could lay against his chest.
“I love this part about you,” Izuku mumbled, squeezing a hand over Katsuki’s pec, squeezing the flesh up between his fingers and giving it a small bounce.
“Perv,” Katsuki said, sleepily, grinning.
“I don’t care,” Izuku said, pressing Katsuki’s tits together, pushing his face against them. “I’m allowed to like my husband’s chest. It’s so big.”
“Damn it,” Katsuki grumbled, blushing now, “Don’t say it like that.”
“Mmm…Kacchan’s chest…”
“You’re so damn annoying.”
Izuku smiled, bringing his face up and hovering over Katsuki, eyes glittering. “And I’m yours.”
“Yeah,” Katsuki grunted, “Unfortunately.”
That made Izuku laugh and then they were kissing again. It didn’t take long before Izuku was sitting back to slide Katsuki’s cock back inside of him, and then Izuku was riding him, his hips shaking with every motion. Katsuki was winded by the sight, watching the way Izuku’s neck elongated as his head dropped back. Izuku’s shameless moans filled the night sky, and it finally dawned on Katsuki that this would be the rest of his life.
Marriage fit them well. It felt natural to wake up to Izuku every morning. They were gifted a brand new hut by their parents as a gesture of their faith and support. They decorated it carefully with flowers pulled from the mountainside that would be hung to try. It became their home.
Each night, Katsuki would take Izuku again and again until there wasn’t a part of his body he wasn’t familiar with. Every morning, Izuku would wake him with kisses, hands wandering, and then his mouth would wander.
They grew into one another. Growing together. When Izuku tripped, Katsuki would already have his hand to steady his hips. When Katsuki started to scowl, Izuku would be there, a kiss at the side of Katsuki’s mouth to push back a deeper frown. They knew each other so well that one look at one another said everything. They could tell when each other had come down with a cold just from a glance alone.
Katsuki always seemed to know what Izuku wanted to eat. Izuku knew when Katsuki just needed a hot bath to chase away a stressful day. Their animals grew with them. The sheep bleated joyously at the sight of Katsuki and they would flock to him, bumping their heads against his chest until he would kiss their noses and floof their ears.
Izuku accused him of feeding them snacks for their bias, but the truth was that the sheep simply understood how much Katsuki loved them, how much he loved Izuku, and they loved him for it. The true could be said for the wolves. The way that they would roll onto their backs and expose their bellies to Izuku. The way that they would whine and yip for his attention and act like damn dogs just to get Izuku to laugh.
When they grew into their twenties, they just seemed to fall deeper in love. Katsuki loved that Izuku stayed smaller than him, teasing him mercilessly about it, but they both loved it. They loved that Izuku had to stand on his toes to kiss Katsuki. They loved how at night, when they felt like dancing, sometimes Izuku would step onto Katsuki’s feet and cling to him while Katsuki danced them awkwardly around the room until they were both laughing.
Izuku felt safe curled up against Katsuki’s side. But it wasn’t as though he needed his husband to keep him safe- and that’s what Katsuki liked best. He liked how riled up his husband could get. People tended to believe that it was Katsuki you had to look out for, but Izuku was the real hellcat in their relationship, defensive as his sheep tended to be when he sensed a threat. The way it was always Izuku who would stand up at meetings and snarl at the other tribes that they were being stupid about something.
When they arrived for group travels, Katsuki allowed Izuku to take the reigns. Izuku who would be insistent about what they had to do next, what move they would make, and Katsuki was happy to follow.
Some nights, he loved Izuku to take him apart. Izuku would kiss Katsuki, put him on his back. Sometimes Izuku would slide his own cock between his tits, fucking them until he was streaking white across Katsuki’s face, playing with his nipples and teasing Katsuki for liking it just as much. Sometimes Izuku would bend Katsuki in half and fuck him so hard his chest would bounce would every thrust, and Izuku would just smirk down at him.
“You are really slutty like this, Kacchan,” Izuku would whisper, and Katsuki would be too busy being dicked out to have a single coherent thought, and he would sob when Izuku came inside of him, teasing him about how much he liked that too.
Izuku would watch Katsuki intently whenever Katsuki chopped wood.
“It’s just so lewd,” Izuku would mumble to himself, “It’s unreal. Your biceps are bigger than my face and when you’re relaxed, your stomach is so pouchy and cute, and then you swing the axe over your head and you see all that muscle, and then when you swing down, there’s just this bounce and-.”
“You’re muttering again, Deku. Stop annoyin’ me,” Katsuki snapped, blushing mostly because his husband was such a little fiend sometimes.
“Ahh…But Kacchan…You’re teasing me…!”
“I’m fuckin’ not! You’re just a damn pervert.”
“but your body, Kacchan…”
“I can’t help it!” Katsuki snapped, throwing a piece of wood right at Izuku’s head. Izuku easily tipped to the side and avoided the wood.
“It’s just so…sexy…I want to suck on your nipples every time I see–! Ahh! Kacchan!” He was screaming as Katsuki headed towards him with axe in hand and a murderous look on his face. After a twenty-minute chase around the yard, the two wound up falling against the ground and Katuski was sucking Izuku’s cock into his mouth, down the back of his throat, and pulling an orgasm out of him with such force that Izuku sobbed the entire time.
“I love you,” Izuku babbled like a moron, “I love you so much.”
That night, after Katsuki had fucked him deep and thoroughly, Katsuki spent an hour just luxuriously eating Izuku out. He slurped up his own cum, swallowing, before rolling his tongue around in Izuku, spelling out their initials together, making Izuku cry harder. When Izuku came again, Katsuki stuffed him back full of his own cock, watching the way his thick cock spread Izuku open and made Izuku switch.
As he fucked Izuku from behind, Izuku’s ass bounced off his hips with a delicious jiggle. It wound up with Katsuki burying his face back into Izuku’s ass later, tongue in, Izuku shaking from overstimulation, and Katsuki didn’t hold back.
When morning came, Izuku sat on his face and moaned lowly the entire time Katsuki ate him out. It was a fair trade-off because the following day, Izuku sucked and sucked at Katsuki’s nipples until they were sore and puffy until Katsuki’s face was wet with tears. He called Katsuki a good boy, then fucked Katsuki’s mouth until Katsuki was hiccuping and crying just as much as Izuku had been the night before.
They really did love each other.