Behind Closed Doors
Prohero Katsuki x reader
Genre/Warnings: Domestic Fluff, soft moments, slight emotional variability for katsuki, katsukis attitude
Synopsis: —his love for you is hidden in the small, everyday acts of affection.
Note: I like to imagine katsuki becoming a completely different person when he's left alone with you 🍒
w.c: 2,211
The difference in Katsuki’s behavior always caught you off guard, no matter how long you’d been together. In public, he stormed through crowds with an intensity that left everyone around him on edge. His voice would rise above the noise, sharp and commanding, as he ordered others around or shut down any attempt at small talk with a single glare. He hated being slowed down and hated when people got in his way. But when his gaze flickered to you, just for a moment, there was something else—something quieter, softer, that only you could see.
It wasn’t that Katsuki toned it down in public—not by a long shot—but there was a certain way he carried himself when you were beside him. As if you were the exception to the rule, the one person he didn’t mind sticking around. Even when surrounded by fans or reporters, his body would instinctively angle toward you, a subtle shield between you and the world. His touch was always firm, but never rough, as though he was unconsciously protecting the one part of his life he wanted to keep safe from the chaos.
One night, after a particularly long day, Katsuki came home more irritable than usual. You heard it the moment the door slammed shut, his heavy boots stomping across the floor. He tossed his keys onto the counter with a sharp clink, his jaw tight, and his scowl deeper than normal.
“—fucking idiots…” he muttered under his breath, running a hand through his messy blonde hair. “Can’t even do their damn jobs, right”
You watched him from the couch, knowing better than to approach him immediately when he was like this. Katsuki needed time to cool down to let the frustration simmer until it dulled. Still, you couldn’t help the small smile tugging at your lips. He was all bark out there, terrifying to anyone who crossed his path, but you knew that in just a few minutes, he’d come over, sit next to you, and let out that sigh—the one that meant he was done being a hero for the day.
And, just as expected, he did. After a few moments of grumbling to himself, Katsuki crossed the room and dropped down beside you with a huff, his head falling back against the couch cushions. You didn’t say anything, just reached out and placed your hand on his thigh, grounding him with a simple touch. His shoulders relaxed almost instantly, the tension melting away as he exhaled deeply.
“Rough day, huh?” you asked quietly, giving his leg a gentle squeeze.
“Tch. Yeah.” He closed his eyes, one hand covering his face. “Just sick of dealin’ with everybody out there all day.”
There was a pause, the room settling into a comfortable silence before he added, his voice quieter, almost sheepish, “Missed you…”
It was in those moments you realized how much he relied on you to recharge. He wasn’t the type to come home and fall apart, but there was a vulnerability in the way he leaned into you, even when he tried to play it off. Katsuki didn’t need grand gestures or declarations; he showed his love in the way he let his guard down when it was just the two of you.
Later that night, after you both settled into bed, Katsuki turned toward you, his movements slower, more deliberate as the day’s tension ebbed away. Without a word, he tugged you into his chest, his strong arm wrapping securely around your waist, pulling you close. The heat of his body seeped into yours, and the familiar rhythm of his heartbeat thudded softly beneath your ear. He nuzzled into the crook of your neck, his breath warm as it brushed against your skin, sending a wave of comfort through you.
His grip was firm, possessive, but tender, as if holding you was the only thing keeping him grounded. For a long moment, he said nothing, just breathed you in, his hand tracing lazy circles on your lower back. Then, with quiet vulnerability, Katsuki’s voice rumbled softly against your neck, thick with the weight of sleep and affection he rarely voiced.
“Can’t stand anyone else… but you,” he mumbled, his lips brushing your skin in a way that sent shivers down your spine. “But with you… everything feels right.”
The words were so soft they could’ve easily been lost to the night, but in the quiet of your room, they wrapped around you like a warm blanket. Your heart swelled, warmth spreading through your chest at the rare, intimate admission. Turning in his arms, you pressed a lingering kiss to his cheek, your lips brushing the corner of his mouth. Katsuki’s hold tightened instantly, his hand sliding up to cradle the back of your head, as if the simple act of being this close wasn’t enough.
He exhaled deeply, the last of his tension melting away as he pulled you impossibly closer, his forehead resting gently against yours. “You’re not goin’ anywhere,” he murmured, his voice softer now, a whispered promise in the quiet. "Not without me."
In that moment, there was no one else in the world but the two of you—wrapped up in each other, his love woven into every touch, every breath, every heartbeat.
It was in these moments, when the world outside faded away and it was just the two of you tangled in the sheets, that you truly understood how much Katsuki cared. How deeply he loved, even if he didn’t always say it out loud. You saw it in the way he relaxed when you were near, the way his fiery temper cooled into something soft and unguarded, a side of him no one else ever got to see.
Katsuki might hate the world—hell, he made no secret of how unbearable he found most people—but when it came to you, it was different. You were the calm in his storm, the quiet he sought after the chaos of hero work. And in return, he gave you a side of himself no one else would ever know. That alone was enough to show you just how much he cherished you.
The next morning, you woke to the smell of coffee and the sound of Katsuki moving around the kitchen. When you padded out, rubbing sleep from your eyes, you found him already dressed in his hero uniform, his back to you as he flipped something in a pan.
“You’re up early,” you remarked, leaning against the doorframe.
“Yeah, well,” he grunted, glancing over his shoulder with a smirk. “Figured I’d make you breakfast before I head out. Can’t have you starvin’ while I’m out dealin’ with idiots, can I?”
You laughed, moving over to wrap your arms around his waist from behind, pressing your cheek to his broad back. “I love you, Katsuki.”
“Tch… love you too,” he muttered, but you could hear the smile in his voice.
The warmth of Katsuki’s back against your cheek, combined with the rich smell of breakfast, made you want to stay wrapped around him for the rest of the morning. You lingered there for a moment longer, savoring the rare quiet before he had to face the demands of the day.
He turned off the burner with a sharp flick of his wrist, then nudged you gently with his elbow, his tone playfully gruff. “Go sit down, idiot. I made all this for you, not so you could just stand around and get in the way.”
You smiled at the familiar edge to his words, knowing the affection that lay underneath. “Okay, okay,” you teased, stepping back and heading to the table. As you sat down, Katsuki brought over a plate piled with perfectly golden toast, eggs cooked just the way you liked them, and a small portion of your favorite fruit. The meal was simple, but you could feel the care in every detail.
He placed the plate in front of you, then leaned down, brushing a quick kiss to the top of your head before heading back to the kitchen to grab his own breakfast. “Eat up,” he said over his shoulder, his voice softer than before.
You dug in, and the taste of the food, combined with Katsuki’s quiet gestures of love, made your chest feel full. It wasn’t grand or elaborate, but that was what made it so special—the quiet moments when it was just the two of you, sharing something as simple as breakfast.
As Katsuki sat down across from you, he kept glancing up from his plate, watching you eat with a soft expression that only you ever got to see. He didn’t say much, just occasionally asked if you needed more coffee or wanted another piece of toast. There was a contentment in the air, one that spoke of a love that didn’t need constant words to be understood.
When the meal was finished, you stood to clear the table, but Katsuki stopped you with a firm hand on your wrist. “I got it,” he grumbled, already starting to collect the dishes.
You tilted your head at him, a smile playing at your lips. “You’re spoiling me today, Katsuki.”
“Tch. Don’t get used to it,” he muttered, though there was a teasing glint in his eye. “Just thought I’d do somethin’ nice before I head out and have to deal with all those extras.”
His words made you laugh, and the sound seemed to soften the lines of his face even more. Katsuki wasn’t a man of many words when it came to expressing his feelings, but in moments like these, you didn’t need them. The way he made breakfast, the way he took care of the dishes, and the way he kept checking in on you—it was all Katsuki’s way of showing how much he cared.
When he was done cleaning up, he grabbed his hero jacket from the back of a chair and shrugged it on, his movements fluid and practiced. You walked over to him, your hands naturally finding their place on his chest as you helped him adjust the collar. He looked down at you, eyes soft despite the serious set of his mouth.
“Be careful out there, okay?” you murmured, your fingers lingering on the fabric of his jacket.
Katsuki huffed, but you could hear the affection in his voice. “I’m always careful, idiot. Don’t worry ‘bout me.”
You stood on your tiptoes and pressed a kiss to his lips, slow and lingering, and for a moment, Katsuki’s hand came up to cup your cheek, holding you in place just a little longer. When you pulled away, his red eyes were dark with something you couldn’t quite name, but you could feel the weight of his affection in that look.
“Get some rest today,” he said, his voice low and serious now. “I’ll be back before you know it.”
You nodded, watching as he stepped back and adjusted his gloves, his usual sharp, determined expression settling back in place. But before he opened the door, he turned back one last time, that softer version of him peeking through once again.
“Love you,” he said, and it was quiet—so quiet you almost missed it. But it was there, and that was enough.
“I love you too, Katsuki,” you whispered, your heart swelling as you watched him leave, already looking forward to the moment when he’d come back and the world would quiet down again, just for the two of you.
The hours passed slowly after Katsuki left. You tried to keep busy, flipping through a book or scrolling absentmindedly through your phone, but your mind kept wandering back to him. It was always like this when he was out on patrol. You trusted him more than anything, knew he was one of the strongest heroes out there, but that didn’t stop the small flutter of worry from creeping in now and then.
It was late in the afternoon when your phone buzzed with a message from him.
"On my way back. Be there in 20. Don’t start dinner without me"
You smiled at the screen, already feeling the familiar warmth in your chest. Katsuki was always direct, even in his texts, but the fact that he let you know he was coming home—that he was thinking of you—made your heart skip a beat.
When he finally walked through the door, there was none of the usual tension from his long day. He dropped his bag by the door and kicked off his boots, heading straight for you without a word. You barely had time to set down the book you’d been reading before his arms were around you, pulling you into a tight hug that left no room for anything but the two of you.
“Missed you,” he murmured against your hair, his voice quiet but full of that raw, unspoken affection you had come to know so well.
“I missed you too,” you replied, your arms wrapping around his neck as you leaned into him, letting the steady thrum of his heartbeat beneath your cheek wash away the last traces of the day.
And just like that, the world outside faded away, leaving only the quiet warmth of Katsuki’s presence and the simple, steady rhythm of your life together.
Gimmie soft pro bakugo ..I guarantee this man would treat you with respect u deserve
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