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[NSFW] FIC - "Everything About You"
🕑 Added 2025-08-14 16:00:00 +0000 UTCDKBK | post-canon | UA third years (they're 18) | established relationship | semi-public sex | implied switching | explicit sexual content
Katsuki takes Izuku horseback riding. And then rides Izuku.
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EVERYTHING ABOUT YOU
A little-known fact about Katsuki was that all through elementary and some of middle school, his parents had run the gamut of getting him into as many extracurricular activities as possible. Katsuki had always been smart and quick to learn. He rarely encountered a problem or setting where he hadn't excelled.
When the clowns he called his friends whined about why he was good at everything, they didn't know that it wasn’t just because he was naturally gifted. It was also because he was the only child of well-to-do parents. They weren't Yaoyorozu-levels of rich, or even Todoroki-level, but money wasn't a thing Katsuki had ever needed to worry about.
To be fair, for most of his childhood, he'd been a rich kid who didn't realize he was a rich kid. But that didn't change the fact that he'd been given opportunities to try everything from music and dance to sports, martial arts, all manner of academic olympiads, often concurrently, and even had some medals to show for them.
Then Katsuki had told his parents enough was enough, because he'd always known what he wanted for his future and his goal had never once wavered. He would be a hero.
Those had been the years he and Izuku weren't talking to each other. It was Katsuki's fault, of course, but he wanted to make up for all that lost time.
That was why, during their third year summer break, Katsuki drove them an hour north of Musutafu to the Yaoyorozu horse farm. When he'd proposed the idea of taking Izuku horseback riding, Izuku had been first taken aback and then downright incensed to learn just how much of Katsuki's childhood he never knew about.
Then he’d whipped out a notebook and pencil, and told Katsuki to start from the top. Instead, Katsuki decided he would show, not tell.
Yaoyorozu had been more than happy to offer her family's horse farm for their use. They stabled a number of champion Thoroughbred race horses and some of the finest breeds in Japan, but those weren't of interest to Katsuki. When they arrived, they were met by the stable master, who'd already hand selected their calmest and most patient mare for Izuku.
He enjoyed helping Izuku into a sturdy pair of riding boots, despite the nerd’s protests that he could do it himself. Katsuki liked the shade of red he turned when his fingers trailed down muscular calves and sensitive heels. Also he never turned down a chance to touch him.
Katsuki waved away the stable master when he moved to help Izuku into the saddle. Instead, he laced his fingers and leaned over to give him a leg up. Izuku shoved curls out of his eyes, adjusted his helmet, and then placed his foot into the cradle of Katsuki’s hands.
Once he got his other leg over the saddle, Katsuki moved to brace his waist, earning a small squeak and a warning look that he ignored. He slid his hand from hip to thigh, enjoying how the adorable nerd squirmed, before finally stepping away.
The stable master stepped in to take the reins and remind Izuku of the basics he’d gone over earlier. Izuku nodded along but his eyes were on Katsuki, who fit his boot into the stirrup and mounted in a single smooth motion. It’d been a long time since he last rode, but that didn’t matter. His body remembered.
He should have been used to the awe shining in the large green eyes watching him, but it never failed to put him on edge. He didn't understand it, and he sure as hell didn't deserve it. He’s been a self-absorbed, entitled asshole who’d done his absolute worst to cut Izuku from his life, refusing to acknowledge his existence except for when he got in Katsuki’s way. Then he made sure the nerd wouldn’t forget his place.
All those years without Izuku had been filled with endlessly different experiences and challenges that he’d certainly enjoyed but that had also fed his considerable ego. He’d trade them all just have that time back with Izuku.
Before long, they were on the trail. It was a long but easy route through manicured gardens and sparse woods. Katsuki guided his horse with small nudges, and Izuku’s thankfully followed his lead instead of responding to his anxious rider.
Watching Izuku flounder in the saddle–when Katsuki had seen him perfectly balanced atop the crown of a skyscraper–was pretty damn funny, but after an hour of this, he decided to take pity on the generously patient horse.
Sidling closer to Izuku, he leaned over and neatly plucked Izuku from the saddle.
“Kacchan!” Izuku squawked as he was situated in front of Katsuki. He threw an indignant look over his shoulder as he adjusted his legs.
Flashing his canines in a grin, Katsuki wrapped one arm around Izuku’s waist and pulled him flush against him so that Izuku’s ass was tightly pressed to Katsuki’s crotch. Hand pressed flat over a firm stomach, he could feel the way Izuku’s breaths hitched.
Then the nerd slowly and deliberately rolled his hips so that his perfect pert ass rubbed over Katsuki’s dick.
“You know,” Katsuki said conversationally, “Ponytail made sure we’d be the only guests here today so we’ve got five hundred acres all to ourselves.” Well, excluding the staff.
“Five hundred?!”
He murmured against Izuku’s ear, relishing how he shivered, “Plenty of time to get some riding in.”
Izuku whimpered, hands gripping Katsuki’s arm still wrapped around his waist.
Despite his teasing, though, Katsuki didn’t do anything more, even with Izuku wiggling in his lap. Soon enough, the stunning countryside stole Izuku’s attention, and Katsuki smiled into his mop of curls as green eyes closed and he turned his face to the sun.
After another hour, they stopped to rest the horses (and for Katsuki to pin Izuku to a tree and kiss him until they were both breathless), and then Izuku climbed back onto his mare, ready to try riding on his own again.
Now that he was more comfortable, Izuku was able to settle into the saddle. Shortly after noon, they passed a large but shallow pond, giant koi fish glimmering silver and gold beneath the water's surface like coins in a fountain.
“I need to stop,” Izuku said, tugging on the reins. By the time Izuku got both feet on the ground, Katsuki had dismounted and was waiting to help steady him. “My tailbone is killing me.”
Katsuki grunted. “Hero Deku bested by a saddle.”
“The horse deserves more credit.”
“Go relax.” He ushered Izuku toward the pond. Thick, well-tended grass led up to the water’s edge, marked by mossy stones and cattails.
Two satchels hung from his saddle bag. He removed both, carrying them to where Izuku was pacing to stretch his legs. Without a word, he removed a tightly rolled blanket from one bag and unfurled it across the grass. After a moment, Izuku wandered over to investigate.
“You made us lunch?” Izuku asked, those big eyes already watering with emotion. “When did you have time to do all this?”
Katsuki flashed him a smug grin as he set out a variety of simple dishes, neatly packed in bamboo containers. “Got up early this morning.”
“Kacchan—”
“Quit blubbering, and sit down.” He handed Izuku a thermos of miso soup that was still hot.
Izuku happily complied. They rarely had days like this. As third years, they were inundated with coursework in their regular classes and increasingly difficult training simulations and challenges in their hero classes. Add internships on top of that, and Katsuki sometimes felt like every hour of their day was accounted for.
Outside of training and joint patrols, Katsuki only truly had Izuku to himself on nights when one of them wasn’t too tired to sneak into the other's dorm room. Those nights, they tore at clothing and grappled with naked skin, hands hot and breaths hotter.
Sometimes, Katsuki got on his knees and took Izuku into his mouth until green lightning flickered up scarred hands as he unraveled. Sometimes, Katsuki pushed Izuku’s face into his bedsheets as he pounded into him from behind, neither of them worried about discretion.
Today, they took their time enjoying lunch under a blue sky as their horses grazed nearby. Then, once all the containers and empty dishes had again been packed away, Katsuki grabbed the other item he’d packed this morning and then spread out on the blanket to tug off his boots.
“What are you doing?” Izuku asked from where he was sprawled on his back beside him, one hand resting on his full stomach.
“Riding practice,” he said lightly.
It wasn’t until he stripped off his tee that the nerd seemed to catch on. He rose on his elbows, eyes darkening with lust as they followed the path of Katsuki’s hands to the waist of his jeans. Happy to give him a bit of a show, Katsuki lay on his back and lifted his hips to slide down his pants, revealing dark green boxer briefs over the bulge of his soft cock.
“Kacchan,” Izuku breathed. “I want you in my mouth.”
“I’ve got a better idea,” he said, rising to his feet to tower over Izuku.
Izuku watched through hooded lids as Katsuki pushed down his underwear and let them fall to his ankles where he kicked them aside. Smirking, he turned his back to Izuku before straddling his thighs.
“Get your ass up here,” Izuku said in a rasp, hands coming up to smooth his palms up the backs of Katsuki’s thighs.
“Patience, Nerd.” He ripped opened the packet of lube he’d taken from the satchel and squirted most of it onto his fingers. He’d already stretched himself that morning after making their lunch, so it shouldn’t take much to be ready.
Then, he bent over, braced his weight with one arm, and reached back with his lube-slicked fingers. Glancing over his shoulder, because there was no way he was missing Izuku’s expression, he circled the rim of his entrance with one finger. It was still soft and yielding.
Izuku’s eyes widened, pupils dwarfing the green, and his breaths grew loud and quick. “Kacchan? What are you…?”
“Told you,” he said before pushing in both his middle and forefinger. He gasped softly, lashes fluttering and mouth falling open at the intrusion. “Riding practice.”
Although they’d been fucking for months (and other things before that since second year), Katsuki had yet to bottom. Not because he didn’t want to, but because they’d decided Izuku would bottom first, and then the cockslut had enjoyed it so much that switching had been pushed off for a future occasion.
But Katsuki was ready, and judging by Izuku’s reaction, so was he.
“You’re amazing, Kacchan,” Izuku mumbled. “So beautiful. You should let me eat that gorgeous ass first.”
Normally, he’d be all for it. But not now.
“Later. After you fill me with your cum. You can lick me clean.” He arched his back, pressing against a third finger, biting back a moan.
He loved Izuku’s eyes on him, loved the hunger that overtook the awe. With a sigh, he withdrew his fingers and resituated himself over Izuku so they were face to face. He wanted to be able to see him when he sank down on that fat cock.
With his clean hand and Izuku’s assistance, he made quick work of Izuku’s jeans. He yanked down the fabric just enough to free his straining erection, the red tip already glistening with precum. Katsuki used the rest of the lube to slick Izuku’s cock, earning a hiss of pleasure.
Then, impatient, Katsuki shifted to position Izuku’s cock at his entrance and unceremoniously sank down the full length.
“Fuck!” Every muscle in his body went taut, and he moaned loud and long at the satisfying burn. “So big. Fuck.”
Izuku wasn’t faring any better. He had his head thrown back, neck muscles straining, fingers digging bruises into Katsuki’s hips.
Katsuki gasped for air, thighs trembling as he rose a scant inch and sank back down. Pleasure lit up his spine as the thick length brushed over his prostate. “Gonna move,” he panted.
Then he shoved up Izuku’s tee to expose rippling abs and the thin trail of green hair leading down to where they were joined. Planting his hands on Izuku’s stomach, he rocked his hips, found a steady rhythm, and lost himself to the sensations bombarding him from all sides—the incredible stretch, the fullness that he already knew he would crave again, the harsh denim of Izuku’s jeans against his inner thighs, and Izuku’s familiar hands sliding up his biceps to cup his pecs.
His head fell back as he rode with abandon, body undulating, sweat sliding down his spine. He understood now why Izuku loved this so much. Not that Katsuki didn’t also love ramming his dick into the tight heat of Izuku’s body, but this was a different kind of pleasure.
“You’re so good at this,” Izuku said between thin breaths. “Feel amazing. You’re so tight, so perfect. Take your pleasure, Kacchan. Use me just like that. Make yourself feel good.”
“Izuku,” he gasped, slamming down harder, grunting with every slap of sweaty skin. He shifted to lean back, bracing his hands on those powerful thighs still class in jeans. His own thighs burned, but he didn’t even think about stopping.
His position thrust his chest out for Izuku’s restless hands, which eagerly squeezed his pecs, pushing the generous mounds together.
“I wanna fit my dick right here,” Izuku said, rubbing his thumbs along the crease formed by his squished pecs. “Would you let me?”
“Stupid Deku,” he said breathlessly. “Don’t you know by now I’d let you do whatever you want?”
“I want what you want,” was Izuku’s immediate response. His hands moved on to pinching and rolling his nipples until it was more pain than pleasure.
“I wanna fucking come on your cock,” he said through gritted teeth.
“Then come.” Izuku released his pec to grip his weeping length, setting a quick pace to match Katsuki’s frantic bouncing.
“Fuck, fuck, fu—” His voice gave way to choked moans as the additional stimulation sent him over the edge.
His body jerked as he came, ropes of cum painting Izuku’s abs in white streaks. He worked himself on Izuku’s dick through his orgasm, shuddering when it stretched into overstimulation. Then, wrung dry, his strength gave out and he collapsed on top of Izuku.
Soothing fingers ran up and down his back as he recovered his breath and his pulse slowed. He felt the faint pressure of a kiss against his sweaty temple. After a while, part of him distantly noted the sensation of Izuku’s softening dick and something wet sliding out of him. He hadn’t even realized Izuku had finished as well.
Exhausted, he raised his head to give his nerd a lazy smile. “Not bad.”
Izuku’s mouth fell open in outrage. “Not bad?!”
He dropped a hard kiss on those pouting lips and said, “You heard me. Gonna have to take you for another ride to really break you in.”
“That’s a terrible metaphor.”
“Says the guy who told me to use him.”
“But I was being literal.”
“So was I.” With a laugh, Katsuki shoved off of Izuku, lip curling at the mess sliding down his thighs. Luckily, he’d brought a towel and wet wipes.
“Now what?” Izuku asked as he wiped himself down. His clothes were hopelessly rumpled, but he straightened them out as best he could. “Are you going to be able to sit in a saddle?”
“You looking down on me?” Katsuki asked with a teasing smirk. He was a little sore, and his lower back would probably feel it tomorrow, but for now, his muscles felt pleasantly loose.
“Let’s stay here a while? We’ve got all day, right?”
“Yeah.” Fully dressed again, Katsuki sank to the blanket at Izuku’s side and rested so that his head was in Izuku’s lap. “This is nice.”
“I love you.”
He felt his face grow warm, but he reached up to tangle his fingers in green curls and pull him down for a much gentler kiss. Izuku sighed daily against his mouth, and Katsuki greedily breathed him in.
Katsuki had a whole list of things he still wanted to show Izuku, and while they had a busy school year ahead of them, he wasn’t worried. They would have more days like this one, and if he had anything to say about it, a whole lifetime to be filled with them.
~fin
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