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Katski roughly kicked his steel-toed boots off at the door as he stepped inside his apartment. They clunked loudly against the floor, the sound rivaling the stomping of his now socked feet. He made a direct beeline for the bathroom, more specifically the shower, promptly ignoring the way Izuku’s unruly head of emerald curls immediately peeked over the arm of the couch at his arrival.
The loud display had stirred the slightly dozing man who now laid fully awake, not bothering to pause the old quirk documentary that played on the television as he peered over the arm of the couch. Izuku was used to Katski being, well, himself, when he got home from rough patrols and discovered it better to let the explosive blond shower and cool off before trying to talk about his day.
As much as it pained Izuku to see steam practically pouring out of Katski’s ears as he stomped past, face angry and pinched up more than usual, tension holding his shoulders tight and back stiff, he knew Katski needed a moment to himself. Izuku ran a hand through his hair, fluffing his curls that had been smashed against the couch during his nap as he heard the distant hiss of the shower starting.
Izuku allowed his mind to wander. What could he do for Kacchan today? How could he rectify the obviously shitty day his love had endured?
Sometimes, all Katsuki wanted was to cuddle, to feel Izuku’s arms around him, holding him firmly against his chest as the blond relished in the comfort he so rarely allowed himself to take. Sometimes, Katsuki wanted Izuku to take him sweetly, all soft kisses and reassurances of his devotion as they became even more unified (if that was even possible at this point).
But sometimes, sometimes Katsuki didn't want sweetness at all. Sometimes he needed Izuku to hurt him worse before he could make him feel better. Sometimes he needed to be forced over the edge into the sweet, calm headspace he desired so much, the one where finally allowed himself to step back and let Izuku take care of him. To get there was always a challenge. Katsuki always needed to be pushed.
Luckily, Izuku had years of practice pushing Katsuki.
He knew exactly how hard Katsuki needed him, exactly where to put his hands on his throat to elicit pleasure, not suffocation, exactly where to spank, to bite, and to kiss. Izuku prided himself in knowing exactly how much strength to put behind his hand to make Katsuki dance to the delicate line between pleasure and pain, without ever going too far in the wrong direction.
As with everything else in his life, Izuku had done extensive research regarding this subject. He’d forced Katsuki to sit through his entire spiel of boundaries, safe words, and aftercare, ensuring Katsuki knew exactly how to stop if things ever went wrong.
“You know I ain't weak, damn nerd, I can take whatever you give me.” Katsuki had rolled his eyes at Izuku’s insistence, voicing the well known fact that he was strong enough to stop Izuku if he ever needed to.
Of course Izuku knew this, this is pro-hero Great Explosion Murder God Dynamight they're talking about, but that didn't ease the ache that settled in his gut after hearing Katsuki’s words. “I don't just want you to take it Kacchan, I’m doing this for you. I want you to enjoy it.”
That was true. Izuku never would've struck Katsuki during sex if he hadn’t asked, besides maybe a slap or two across his ass here and there. But Izuku would be lying if he said the way Katsuki spoke with such little regard for himself and his personal enjoyment didn't make him nervous.
Of course Katsuki would take whatever Izuku gave him, he was the toughest man Izuku had ever known. But what if he goes too hard? What if he gets distracted and hurts him? Will Katsuki continue to take the pain past enjoyment just to rise to the challenge?
The thought continued to haunt Izuku, even after they'd had rough, desperate sex multiple times. Don't get him wrong, Izuku loves to watch Katsuki crumble beneath him, to shatter him into pieces just to put him back together again with twice as much love, but the thought of hurting Katsuki beyond his limits always lurked in the back of his mind.
Izuku shook his head, rubbing the last bits of sleepiness from his nap earlier from his eyes. Whatever Katsuki needed from him, he was more than happy to provide.
—
Katsuki sighed heavily as ice cold water pelted against his skin, washing grime and nitroglycerin down the drain. He’d once taken a too-hot shower in his youth, the steam and water making him sweat without realizing and setting off his quirk, blowing up his entire bathroom before he even understood what had happened. The hag hadn't been pleased with that one…
Ever since that day, Katsuki’s gotten used to cold water washing over his body, the way his muscles initially tightened from the temperature, but gradually relaxed as his body adjusted, he enjoyed it. He had more than enough control over his quirk to take hot showers now, but usually opted not to, Izuku ran up their hot water bill enough with his extravagant showers on his own.
He scrubbed his blond hair with much more force than was necessary, nails digging almost painfully into his scalp. He was so damn angry today, had been from the moment he slid out of Izuku’s grasp that morning, tiptoing around the sleeping nerd so as to not disturb the snoring mess of green curls in his bed.
He had absolutely no reason to be as pissed as he was.
Katsuki had a grip on his anger. He wasn't the same hot-tempered brat he was in high school. Well- he was working on it, okay? It was better now than it had been his entire life, but sometimes, on days like today, he just couldn't control it anymore. It seemed to bubble up inside him until he imploded for no reason at all.
More than anything though, Katsuki felt stupid. This, in turn, led to him feeling angry for feeling stupid, which made him feel more stupid, which only managed to make him feel more angry. It was a truly vicious cycle.
This was the first non-emergency Saturday he’d worked in months. Best Jeanist knew that Katsuki hated working weekends without proper reason, knew he hated leaving Izuku home alone even though the nerd was “more than capable of being on my own, Kacchan.”
Ever since that damn war…
It had been years. Years of being a pro, years of Izuku teaching, years of their happy, safe, life together, yet sometimes Katsuki still felt like his heart was going to burst through his chest, like one day he would come home and Izuku would just be gone, that everything they had worked so hard for would just disappear.
The worst part of it all? Patrol had gone completely, one hundred percent, perfectly. He’d spent all day helping old geezers cross streets and making sure people came to complete stops at stop signs. He might as well have helped a cat out of a tree with how idyllic the day had gone.
There were no close calls, no shitty reporters, no extras making messes that he had to clean up. He hadn't even caught sight of a news camera fishing for clickbait headlines. The day had been so utterly uneventful that his nerves were shot just waiting for something to happen, waiting for the other shoe to drop on the “perfect” patrol day, but it never did.
Not a single thing had gone wrong outside of his own head, which only led to him feeling worse.
It’s been too long since Katsuki had gotten into a true fight. He sparred often and had to work hard during patrols, but nothing seemed to push him as far as he needed to go. No one could push him as far as he needed. No one but Izuku.
As the last of the soap suds swirled down the drain, Katsuki decided that's what he needed. A push.
He needed to release all of the quiet anxiety that had built up within him throughout the past few weeks that reached a final precipice today. The tension that couldn't be removed from sparring and working out alone. He needed something more, something harder.
He needed Izuku to spank the shit out of him, to shatter him into hundreds of pieces, and put him back together again.
—
Soft footsteps padded into their bedroom as Katsuki was towelling his hair dry, grey sweats hanging low on his waist as missed water droplets shone on his chest and shoulders.
“Are you okay, Kacchan?” Izuku’s voice was soft, much gentler than Katsuki believed he deserved. He looked like an angel, halo of messy curls around his face, still soft with the remnants of sleep, as one of Katsuki’s shirts hung loose on his frame.
Katsuki stepped closer to the slightly shorter man, wrapping strong arms around scarred ones in lieu of a reply.
“Izuku,” Katsuki’s voice was rough, muffled as he spoke directly into Izuku’s neck, “I need-” He didn't even attempt to hide his desperation, voice dripping in desire as he kissed and nipped softly at the sensitive skin under Izuku’s ear, green curls tickling his nose.
“What do you need, Kacchan,” Izuku pulled the blond’s head back, cradling his face gently between his own crooked fingers. His heart practically broke at the sight, Katsuki’s eyes, usually so intensely sharp with focus, were now distant and hazy, eyebrows knitted up in need.
Izuku could imagine the kind of thoughts racing through Katsuki’s head right now. The blond had always been too hard on himself, amplifying the pressure he already faced daily as a pro, until it became unmanageable. Izuku only wished he could take the self-deprication away for good.
“Please put me back together.” Crimson eyes broke contact as they darted to the ground, a soft pink tint tinging Katsuki’s cheeks and the tips of his ears. Cute.
“You remember your safeword?” Izuku rubbed his thumb across Katsuki’s cheek, relishing the soft skin under his hands and staring with more love than Katsuki could handle at the moment.
“All Might.” Katsuki mumbled, barely audible as his gaze remained fixed on the ground. Izuku knew this was hard for him, hell, it was hard enough even having the conversation about safewords, much less choosing one or and using it, but Izuku had to know that Katsuki remembered it before they began, he never wanted to risk hurting Katsuki in a way he didn't want.
Izuku’s reaction was almost instantaneous, smashing their lips together and humming a pleased noise into Katsuki’s mouth. Crooked fingers met damp hair as Izuku gently led him to the bed, their lips never separating as they shuffled backwards.
The kiss was desperate. Katsuki’s lips parted slightly, allowing Izuku to nip at his bottom lip, gently at first, but quickly growing more bold as the former let out a quiet, needy whine. He looped his arms around Izuku’s back, tugging at the hem of his shirt and sliding it quickly up his back.
Only when they separated for Izuku to sit down on the mattress and finish taking off his shirt did he get a good look at Katsuki.
“Kacchan,” The soft moan of his love’s name left Izuku’s lips before he even realized he had said it. Katsuki looked desperate. His chest was flush, lips parted slightly to let out soft huffs as he clambered on top of Izuku’s lap, squirming until their hips sat flush against each other. His crimson eyes shone a perfect mix of clouded lust and sharp desire.
Katsuki leaned forward, kissing Izuku deeper as he panted into his mouth, teeth clashing together clumsily as his nails scraped softly down Izuku’s back. He groaned as Katsuki shifted his hips, blatantly rubbing their clothed cocks together, which were rapidly approaching full hardness.
Izuku’s hands shifted lower, feeling the gentle, inward curve of Katsuki’s shoulder to waist ratio and relishing over the hard, toned muscles of his back and shoulder blades. They drifted downwards to squeeze at toned hips and the soft muscle of Katsuki’s ass, resulting in a sharp exhale from the man above him.
“Izuku, please,” They hadn't even done anything yet and Katsuki already sounded wrecked.
Their sex life was good, don't get either of them wrong, but it had been more than a few weeks since Izuku had time to really, truly wreck Katsuki, body and mind, and it seemed like it was more than overdue.
“Turn around, Kacchan.” Izuku’s voice gained a rare hardness that he only used in moments like this, it was one that Katsuki was eager to follow.
The blond wasted no time turning himself onto his stomach, leaning forward on his forearms as his head rested between them, knees spread and thighs slightly trembling in anticipation. Izuku ran a hand along the curve of his spine, stopping to grip the base of Katsuki’s neck firmly.
“So good for me.” He mumbled, drinking in the sight before him, sliding his grip back downwards and hooking his fingers underneath the waistband of Katsuki’s sweats to pull them down, revealing the rounded muscle with a choked gasp from Katsuki.
Izuku leaned forward, draping himself against Katsuki’s back and meeting his lips in a messy kiss. He wrapped a scarred hand around Katsuki’s cock, already red with a drop of precum at the tip. His thumb flicked upwards, catching the drop and smearing it downwards as he gave a few short, firm pumps.
The blond’s head fell back against Izuku’s shoulder, lips open and shiny with spit as he huffed impatiently, “Izuku, please.”
“I know, I know what you need.” Izuku pressed one more firm kiss to Katsuki’s cheek before leaning back, squeezing Katsuki’s ass with a new roughness, one that he knew Katsuki had been yearning for.
He pressed a quick, chaste kiss to the small of Katsuki’s back before raising his palm and smacking down hard. Katsuki’s head thumped as he dropped it onto the bed and moaned, leaning back into the touch as Izuku rubbed his palm softly over the quickly reddening skin.
With every smack across his ass, Katsuki could feel the tension that had built within him get closer and closer to disappearing. He wanted his anger replaced by the soft words Izuku muttered after every hit, yet, as good as it was, as perfect as Izuku was, Katsuki needed more. His shoulders were rigid and his back remained tight, he could feel his well kept anger stirring in the back of his mind.
“Dammit, harder Izuku.” He shifted slightly, turning so Izuku could see his crimson eyes glaring backwards, causing the man behind him to falter.
“Kacchan, I don't know, I don't wanna hurt you.” Izuku rubbed soothing circles into Katsuki’s ass, which was now bright red.
“You ain’t gonna hurt me, damn nerd. You made me get that dumbass safeword, remember?” He scoffed, tightening his grip so hard he could feel his nails imprinting into his palms. Sensing Izuku’s hesitancy, he continued, “Izuku, please. I really need this tonight. Be rougher with me.”
“Are you sure, Kacchan?” Izuku asked one more time to clarify. If Katsuki needed rough, he could be rough.
“Yes.” With Katsuki’s clarification, Izuku brought his hand down hard.
Katsuki yelped in surprise, body jolting forward on instinct. Izuku wrapped his left arm under his hips and pulled his body backwards, accentuating the arc in his back and lifting his ass impossibly higher. Izuku had his cock trapped against his stomach, holding him firmly in place before striking him again, “I thought you could take it, Kacchan?” Izuku purred dangerously into his ear.
Katsuki moaned in response. He could feel his precum rubbing onto Izuku’s forearm, the friction causing him to cry out, hips not knowing whether to lean backwards into Izuku’s palm or rut forward into his arm.
“Such a good slut for me, huh Kacchan?” Izuku hit him again, hand coming down mercilessly, “You’ll take anything I give you, won’t you?”
Katsuki couldn't stop the slew of desperate whines that escaped his lips. It was perfect, exactly what he needed. “Fuck, ‘Zuku.” He muttered out as the arm wrapping around his waist shifted to grabbing his cock and thumbing over the tip.
“Good Kacchan, fuckin’ take it.” Pain continued to blossom over his ass and thighs as Izuku continued to spank him in time with his strokes.
He could take it. Of course he could take it.
Fuck.
Katsuki squeezed his eyes shut, Izuku’s palm fucking hurt.
The pain was what he wanted. The pain was what he needed.
The pain was what he deserved.
His breath hitched as his safeword flew into his mind.
No. He could do this, dammit. He’s Katsuki motherfucking Bakugo. He can take anything, he’s had much worse injuries than a couple slaps to the ass.
I can take it. I can take it. I can take it.
The mantra repeated through his head as Izuku continued to jerk him off simultaneously as another sharp smack echoed through the air.
As good as it had felt earlier, the pleasure now seemed far away, as if his entire body had been covered by a layer of dense fog. He had wanted this. He and Izuku had discussed it extensively, much more than Katsuki would've liked to be honest, but give it to the nerd to be more than thorough.
He’d asked Izuku to go harder. He couldn't go back now. Would Izuku think he was weak for backing down? Even as Katsuki’s eyes began to fill with tears and his ass stung unceasingly, he couldn't open his mouth to say anything. What was wrong with him?
He didn't even realize Izuku had stopped until he was pulled upwards to sit awkwardly on his knees, face to face with Izuku, whose eyebrows knitted in concern as he spoke.
Hazy crimson eyes blinked slowly, trying to process what Izuku was saying, but couldn't hear anything over the buzzing in his ears. Everything seemed distant and hazy as Izuku reached a gentle hand to cup his cheek, even the touch he knew was gentle seemed far off and unfeeling.
“-cchan? Kacchan? What’s going on? Talk to me, baby,” Izuku’s desperate voice finally managed to cut through the haze of Katsuki’s brain as his crooked fingers swiped tears from his cheeks. He hadn't even realized he’d started crying.
“I- uhm,” Katsuki wanted to speak, he really did try to, but his mind felt so muddled that the words couldn't escape his lips, “All Might.” He looked down fast, not willing to see the look on Izuku’s face when he used the safeword for the first time ever. He must be so disappointed in him. He must think Katsuki is so damn weak.
Izuku was saying something else now, but Katsuki didn't hear it as he raised his shaky hands to his face, roughly wiping the tears that had gathered in the corners of his eyes. “‘M sorry.” He mumbled, still refusing to make eye contact.
Shit.
Izuku’s mind was running almost faster than he could process.
When had Katsuki dropped? How long had Izuku continued after Katsuki had stopped enjoying it?
His greatest fear had just occurred, and he had absolutely no idea when it had happened or how to fix it.
He ran the entire evening back over in his head.
When Katsuki had gotten home, nothing was abnormal. He was a little cranky, sure, but nothing out of the ordinary. Even when they had begun, Katsuki had been fine, kissing him back with the same hungry desperation as always. When had things changed?
At some point, Izuku noticed that Katsuki had stopped grinding forward into his hand, which was his first indicator that something was wrong. In addition to the stillness, he’d also gone eerily quiet.
When Izuku had leaned forward to confirm everything was alright, he’d been met with hazy, unresponsive eyes. That unresponsiveness scared the shit out of him.
Luckily, Izuku had read up enough on the subject to recognize that Katsuki was in sub-drop. Although, he’d previously believed it mostly occurred due to poor aftercare or particularly rough, mean sex. Nothing they’d done tonight was out of the ordinary for them, hell Izuku had hit Katsuki much harder during adrenaline filled post-mission sex, but he supposed that didn't matter. They were here now and Izuku needed to fix it.
Before pulling Katsuki up, Izuku checked over his ass. It was red as hell and would definitely bruise over, but there was no lasting damage that would hurt Katsuki after tomorrow. Other than that and tight, stiff muscles, Izuku was positive that Katsuki was physically fine.
The relief that poured through him when he finally got a response was immense, even if his heart shattered when Katsuki muttered out a quiet, broken safeword.
He pulled the blond into his chest, partially to comfort him and partially because Izuku couldn't bear to see the tears that continued to gather at the corner of Katsuki’s eyes.
“Oh sweetheart, I’m so sorry. You did so good, baby. I love you so much.” Izuku murmured sweet nothing into Katsuki’s ears, yet was unable to tell if he was hearing any of it.
“I’m sorry.” Katsuki muttered again, his shaky hands gripped Izuku’s shoulders as if the man was about to disappear.
“You've got nothing to be sorry for, Kacchan. You were so perfect for me. My strong, handsome boy.” Izuku continued to pet over blond hair and rub Katsuki’s back softly, praying that he could hear and understand his words.
“I wasn't-” Katsuki's voice broke into a shaky, sobbing inhale, “I wasn't strong enough.” His nails dug into Izuku’s shoulders painfully, but the latter couldn't bear to tear him away.
“No, Kacchan, you were perfect. You're always so strong for me. You're the strongest.” Izuku pulled Katsuki’s head from his neck to look into his eyes. “I love you. I’m so proud of you.” Katsuki’s teary eyes broke Izuku’s heart, but at least they were more coherent now, hopefully he was intaking the praise that Izuku was so happy to give.
Katsuki leaned into Izuku’s palm that cradled his face so delicately. “You're so precious to me, Kacchan.”
Katsuki leaned forward and bumped their foreheads together with a soft chuckle. “It ain’t your fault either, yeah?”
Izuku’s heart swelled, even after Katsuki had gone through a drop, he made sure to comfort him as well. “Yeah,” Izuku muttered out, voice wet and eyes teary.
“Oh don't start crying now, damn nerd,” Katsuki nuzzled a freckled cheek with his nose, resulting in the giggle from Izuku he’d been hoping for.
“Have you eaten? I'm starving.” Katsuki stood, offering a hand to the still sniffling Izuku, who took it gratefully.
“How about we order in from that katsudon place you love?” Izuku wiped the last of his tears from his eyes, smiling at the way Katsuki had to do little hops to put his pants back on. It still astonished him that the man he loved so much was right in front of him, perfectly domestic, a sight Izuku never thought he’d see.
“The katsudon place you love.” Katsuki corrected, stupid smirk returning to his unfairly pretty face, “I’m the one that just got beat up, don't you think I should choose?”
“Kacchan,” Izuku whined, despite knowing the man had a good point.
“Fine. But only because I was gonna choose that anyway and I don't wanna deal with you cryin’ on me again.” Katsuki pressed a sweet kiss onto Izuku’s lips, who hummed happily at the contact.
“I love you, Kacchan.” Izuku smiled widely, looking similar to sunshine incarnate, as he shone up at the man in front of him.
“Love you too.” A soft smile graced Katsuki’s lips, one that Izuku used to have to practically kill to see, but was now becoming increasingly more frequent.
As Katsuki input their orders he stole glances at Izuku as often as possible without the other man noticing. He was so in love, it was ridiculous, honestly pissing him off sometimes. He knew there was nowhere in the entire world he’d rather be.