AN: *Tumbles into the MHA section* Uhhh… hey! This is my first fic for this archive. I don't know how big Kacchako is on here compared to AO3 but no matter I wanted to contribute to this wonderful ship on here since this the only place I write. So, whether there's an actual audience or just me writing away like Kermit the Frog on a typewriter for my own peace of mind – I hope that this fic idea is an enjoyable one.

I absolutely love reading other author's interpretation of this ship's relationship/dynamic/interaction, whatever you wanna call it, and wanted to show my own with a twist (cuz nothing I ever write is easy.)

Summary: A tsundere's heart is a fragile little thing much like the spark of an ember. When it's embraced, its warm to the touch but when its drenched in water it turns frigid. And she vowed that she'd protect it dearly in the palm of her hands and in the cavity of her chest for this is her secret alone. Kacchako. Secret Dating AU.

Happy reading~

A Tsundere's Heart

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A Diamond In The Rough

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"Fuck this!" a roar spewed from bitter lips as a metal chair scrapped the floor and tilted backwards.

All of class 1-A's heads turned to bore their curious gazes to a very hot-headed, temperamental ticking time bomb of a tall, muscular figure with wild ashen blond hair aka Katsuki Bakugou.

They all watched as he angrily stuffed tightly fisted hands into the pockets of his baggy school pants and stormed out of the classroom without further explanation.

This happened right after they had all came back from lunch break.

Aizawa-sensei's irritated eyes silently observed as they lost one student with his interruption of a sudden outburst. He deeply sighed, taking out his eye drops and soothed his dry eyes as he continued on with the lecture, ignoring the awkward tension.

In all honesty, the entire class was accustomed to Bakugou's ill manners and sour mood by now.

"Poor Kacchan…" Izuku Midoriya somberly sighed. He was or more like had been Bakugou's childhood friend in another timeline. Despite always on the receiving end of Bakugou's heated glares and filthy mouth – the boy still deeply cared for him.

It was this quiet whisper of concern that perked Ochako Uraraka's ears.

She wouldn't be able to pinpoint when exactly it happened or maybe perhaps she could as she only recently started to notice Bakugou after their match against each other during the U.A.'s sports festival months ago.

It was now the start of the winter semester and Uraraka felt her own form of worry for the boy who just stormed out of class after sneaking a peek at his cell phone.

Nervously, she chewed on her bottom lip as she noticed a fairly bright white glow coming from a screen on the floor where the chair had fallen over.

It was Bakugou's phone left on a text message screen.

Ochako had been itching for another reason to talk to him. Anything really to make the fluttering butterflies in her stomach ease off. She hated that fact that she couldn't deny any longer what she herself felt for the boy with fiery murderous explosion of emotions.

She had confirmed her feelings sometime once things had settled after the huge televised sports festival being taken by surprise when Bakugou had uttered even two words of concern for her one late night while she was getting water in the kitchen of their dormitory area and just so happened to bump into him. She was still sporting a wad of gauze taped to her cheek and a couple of scratches all over her hands, fingers, arms, and chest.

"You okay?"

She remembers him asking her. Dumbfounded by the sudden interest in her health after being knocked down hard by her own exhaustion and stubbornness to push forward despite knowing she had limits – she had stood in front of him with a blank stare. He scoffed and crossed his arms but never exploded in front of her as he simply walked away.

Ever since then, she desperately tried finding other ways to get to speak with him again.

Everyone around her had expected her to pursue something with Izuku as if they almost anticipated that the two close friends would evolve from being so into something more romantic. And while, admittedly she had thought about it, even getting red in the face with furious blushes, she knew that Izuku didn't feel the same way and in the back of her mind had always kept lurking with thoughts of a feisty blond.

Once class was dismissed, Ochako had patiently waited until everyone, including Aizawa-sensei were gone from the classroom. She had politely told her two best friends Izuku and Tenya Iida to not wait for her as she completely made sure she was all alone so she could go and grab the abandoned phone on the floor.

Smoothing her skirt and holding it in place as she quickly bent over to get the phone, her heart started to pick up in pace as she snatched the phone and put it into her backpack too afraid to be caught or questioned by anyone. Scurrying away to her recently assigned dorm room, she double locked her room and placed her backpack on her bed a few distance away from where she was sitting on the bed as if she had dynamite that would go off at any given second.

'You're a good person just trying to be nice and return a fellow classmate's phone back before someone else either steals it or it be reported missing' her mind tried to reason with her, 'and hey, who knows, maybe you'll be brave enough to ask him on a date or even just breathe in his presence!' the wishful, naïve side of her brain chimed in.

Ochako lightly slapped her chubby cheeks making sure not to have her warming cheeks touch the pads of her fingers in fear of floating up to her ceiling having done that far too many times to keep track of. She inhaled and exhaled with closed eyes while chanting a calming mantra to relax her tense muscles to brace herself to look at the phone.

She knew it was wrong and intrusive of her but she needed to know what had been so horrible as to set Bakugou of all people off in the middle of class.

A part of her hoped that he at least had a password lock set up on his phone so that she wouldn't be able to easily get into it but knowing him – he'd probably shout and declare that he was an open book, no reason to have a stupid lock on a flimsy device and so what, who the hell cares what he does on his phone.

She expected that type of response from him as she slid the front screen open and was greeted with the bright light of a simple text.

It read: It's Over.

Ochako's hands shook as she reread the simple text over and over. Her heart plummet at the words echoing in her mind. Had Bakugou been seeing someone at their school? Outside of school? Did this person think so little about their short-lived – what she's assuming to be – relationship that they'd break-up via text?

Her mind raced with all sorts of possibilities and others that seemed too extreme but most of all – did Izuku know and not tell anyone? Surely, he would've gushed and spill all to her and to Iida but he never did mention a single thing. She knew Izuku has an incredibly big heart and respects other's wishes but still…

She wanted to cry.

Cry because she was foolish to think he'd be single which caused her to feel guilty for 'judging a book by its cover' prematurely, thinking she would be the only one interested in him.

Cry because she has a stupid insignificant crush on someone who barely notices her let alone even remembers her name.

Cry because she had to secretly read over his past conversations with whoever broke his heart in order to discover that her crush on him was starting to grow bigger and bigger to dangerous levels where she feared she wouldn't easily recover from.

"I need to do the right thing and return this to him" she weakly whispered to herself as she closed the home screen of the phone and clutched it against her chest. The device was cold in her hands but felt so warm against her chest discovering new things about him.

Bakugou may be rough around the edges like an unrefined diamond but Ochako didn't mind one bit. With a little bit of time, patience, and understanding she knew he could be polished and shine. Sincerely hoping that by giving him back his misplaced cell phone – perhaps they could be friends. Actual friends.

Ochako knew she could always find Bakugou surrounded by his small 'Baku'squad that consisted of their fellow classmates: Eijirou Kirishima, Denki Kaminari, Mina Ashido, and Hanta Sero.

Izuku had explained once to her that Bakugou had a tendency of allowing small groups form around him taking a liking to being the self-declared leader of a posse. He's always been this way ever since they had been children and it seemed like old habits die hard and ever present in the current.

She knew that they liked to mess around in the common area but was greeted with silence. The only two that were occupying the room while sharing a pair of headphones – Denki and his recently official girlfriend Kyouka Jirou. Neither of them being who Ochako was searching for so she figured it wouldn't hurt to try going to his actual dorm room.

'Please, please, please don't leap out of my chest' Ochako mentally pleaded with her heart as she balled up her hand into a fist and pounded her fist against the door in hopes that Bakugou was indeed in his room with the loud blaring rock and metal vibrating through the walls and that he didn't just leave his music on and ditched.

"WHAT?!" a yell demanded as the door swung almost off its hinges at the force.

"Eep!" Ochako wanted to kick herself for softly squeaking in surprise at his sudden appearance. She also wanted to remind herself to slap herself later hard for staring wide-eyed at his black baggy sweats and sleeveless muscle shirt clad body.

He had no right to look so damn hot in lounge wear.

"What the hell do you want?" he politely screeched as he walked back into the room to lower his volume, not completely turning it off. At least he was considerate.

"Umm… Ba-Bakugou… you see… well" she fumbled with her words.

"Oi, are you stupid or something? Spit it out already!" he impatiently barked with crossed arms as he leaned against the doorframe.

Ochako was momentarily distracted by his tense arm muscles as she shook her head and snapped out of it. She hastily bent over and bowed in apology as she dug into the breast pocket of her school uniform's jacket and handed him the phone, "you dropped your phone in class and I wanted to say that I'm sorry for seeing the text… your screen was left on it!" she tried to explain in one single breath in hopes that he wouldn't get too pissed off at her.

What she didn't expect was for him to forcefully grab her by her small wrist and pull her into his room. It all happened so fast that it took her a moment to realize that she was now right behind his closed bedroom door and inside his room that smelled faintly like gasoline and something spicy almost like cinnamon.

"You went through my phone?" he asked in a tone mixed between accusation and clarification.

"N-Not on purpose" she lied.

Hard red eyes bore into her nervous browns as he accepted her lame excuse a second later.

An awkward silence filled the room soon after. Ochako being unsure whether she should tell him that her good deed for the day was done and mad dash for her own dorm before having to face his wrath or if she should pry further into his own personal affairs.

Of course her frazzled mind just oh so happened to pick the latter.

"I didn't mean to read the break up text… I'm sorry you had to go through something like that" she started to ramble, absolutely lost in how to leave his room or to even offer that she could always lend him an ear or a shoulder or really any part of her body for comfort… okay, she definitely should just keep her mouth shut. She was already having a hard time processing that she was even in his room in the first place. Well she was still hanging around the entrance, too afraid to move further but still!

"She was a bitch anyway. Good riddance" he simply said.

He honestly didn't need to explain himself to her nor share anything about his private life. It wasn't like they were friends to begin with but she appreciated it as vague and as blunt as the confession was.

"If you…" she hesitated, "if you ever want to talk about it despite not being friends… I'm always here, Bakugou. Even if I can't offer any comfort of relating since I've never been in a relationship but… I've been told that I'm a great listener" she kindly offered with a weak smile as she peeled herself away from the back of the door, ready to head out.

She paused when she heard him scoff and ask, "really, not even with that dipshit Deku?"

Ochako wasn't surprised by the question or his colorful language. Bakugou was loud and brash when he wanted to be but most of the time he kept to himself in class. Quiet and observant. There was no doubt that even he had probably betted in the large secret betting pool of class 1-A's love life.

It was starting to grow stale on her. Constantly having everyone around her assume things about her. She wasn't some frail little girl that couldn't carry her own weight during battle or be up to Gunhead's tough diet and workout regime. Just like she wasn't always this sweet, sunshine and rainbows twirling person who was all bright outlooks on life and begged to take the easy route. She has her own hopes and dreams for the future, knowing damn well that life sucks and nothing was ever handed without a fee but the lingering question in the air wasn't about her as a person – no – it was about her heart and who held it.

Crossing her arms, she raised a brow and smirked, "are you disappointed?"

Bakugou was taken by surprise at her response as he shrugged, "not like I really give a shit, just hoping I get a big payout out of this"

Ochako would have been offended if she wasn't already so done with her classmates having nothing better to do than guess and assume who was dating who in class. 1-A, soon to be 2-A were all a close-knit group and class as a whole but sometimes… sometimes their personalities were too much for her to bear.

"Good thing you're single again, then you won't have to worry about taking your girlfriend out on dates with my winnings" she rudely shot back at him as this time she was serious about leaving his room altogether until she jolted at the sudden proximity of his palm resting flat against the side of her face.

She could feel warmth radiating off his close hand as he caged her against the back of the door and his hard body in front of her. If he were any closer, she'd be pressed snug and trapped in.

"Then should I take you out since you're practically making me U.A.'s wealthiest top student?" he shot back as he held her cheeks with his free hand sounding like a total douche.

Ochako tried not to blush as she attempted the meanest stare she could muster as both her arms were uselessly still at her sides, unable to push him off or slap him away or better yet touch him to make him float above his ceiling.

"I will never be anyone's rebound" she coldly told him against the hand that held her. Her heart could shatter into a million pieces as she says goodbye to her crush but she'd always protect it from ever stooping so low as to foolishly think that he'd ever want her genuinely for her and not to fill some void.

She had never taken Bakugou for a fuckboy and willed her eyes to not burst into tears at the rapid assumption.

"You have me figured out all wrong if you really think I would do that" he growls, but his words hold no heat behind them. He lets go of her blushing face as he swings his arm to weave his fingers through his messy wild spikes and stretched his tense muscles. "Don't know why I'm even bothering telling you this but trust me I'm not sad or some sappy shit like that. She was a bitch and a whore. End of story. We clashed a lot, and yeah before you throw some smartass comment at me – I'm not fucking blind. I know I can be an asshole"

And there was the Bakugou she knew. She silently plead a silent forgiveness to herself for thinking the worse of him.

"Did… did… more people really bet on me not dating Izuku?" she quietly asked, feeling self-conscious and a bit bad because it felt like her fault if, one: there were any one-sided feelings there and two: if she was the heartless bitch to turn down someone as sweet as Izuku.

Bakugou could've been more energetic in his distaste towards the one he so fondly nicknamed Deku but he didn't because he wasn't in the mood. "Don't know, don't care" he began as he studied her waiting expression, "I just know that 1-B is also in it" he watched her eyes widened at the news as he rolled his own, "not like those extras even matter… but I personally think you could do better than that dumbass Deku" his lips pouted at the mention of Izuku as he acted coolly about his own opinion on the matter.

His words struck her like thunder and lighting at the same time. Here she was, just trying to do the right thing and return his phone to him and then getting pulled into his bedroom once she mentioned she had read that he had been dumped. And all of a sudden, the conversation had shifted into her court and talking about her non-existent crush on Izuku. Sure, she found him sweet and caring and the type of guy that any girl would be lucky to bring home to present to her over-protective father and loving mother but Ochako was apparently one girl that didn't want even the likes of love to be that easy because no, the tall, muscular, moody, oblivious blond idiot in front of her had captured her heart instead.

"What, someone like you?" she blurted, not realizing that the crushing side of her brain had spoken her inner wishful thoughts out loud.

Bakugou would've laughed his ass off and given her a witty remark if he hadn't spent so much time studying her plump pink lips, the scarlet of her blush across her cheeks and bridge of her nose, or the way her long eyelashes gently batted against her soft skin and the way her big round sienna brown eyes watched him like a shy owl filled with something he couldn't quite describe.

As he had mentioned before – he wasn't blind.

Ochako Uraraka is a fellow classmate of his from class 1-A.

She loves mochi. Having seen how her face lights up anytime she gets to eat it as her hands touch her cheeks in glee and on occasion accidentally causing herself to float a few inches off the ground. She was easy to blush as she'd always look around and feel embarrassed anytime she'd accidentally activate her quirk on herself whenever it came to the sweet sticky treat.

She's generally nice to everyone. Even to people who don't deserve it like that bastard Neito Monoma. He had lost count of how many times that would occur, yes it was rare, but every time it had happened he was always left with the imprint of red half-crescent indents on his inner palms from tightly fisted grips and a great desire to punch someone or something, possibly even burn it.

She cares and loves deeply even with things he counts off as not being important. Like anytime that nerd Deku gets injured because he doesn't know how to control his quirk at times and makes Uraraka cry or worry excessively.

She's tough as nails and he can respect that about her. He took her seriously during their match at the sports festival even feeling the thrill of having a worthy opponent who wanted to keep up with him and his quick thinking while on the field. Fragile wasn't how he'd describe her to anyone and if anyone thought otherwise then they had an ass kicking in the front parking lot of U.A. waiting for them.

She has a temper that while not reaching his levels, it still amuses him to see her get all riled up over something which half the time wasn't anything overly big of a deal to get frustrated over.

She's pretty fuckin' cute. Bakugou would char his own tongue if anyone, especially Kirishima had ever caught him saying that out loud. He wasn't a saint, he's experienced and wanted to be cautious of that known fact because he wasn't some dude looking to taint an inexperienced sweet girl. He had been careful of how long he'd find himself staring at her from a distance or the conversations and giggles he'd hear that escaped her lips whenever she was with their female classmates. He never stopped studying her like some book report due at any given moment. He, a top student and aiming to be the number one hero, and also just a teenage boy who, despite what others may think of him, he too was capable of liking someone that didn't seem to fit the same mold as him.

As one would say – opposites do attract.

Bakugou didn't reply with words.

It might've been impulsive and earn him an immediate slap to the face or being launched into orbit – he wasn't entirely sure on which out of the two as both his hands tightly gripped her wrists positioning her still arms high above her head as he shoved her against the wood of his door. He earned himself a prideful lengthy moan coming from her as he hungrily attacked her lips, head bobbing left and right at a desperate pace to claim her as his.

The pace was too fast for Ochako to keep up with as she gasped and blew hot air against his face trying to eagerly follow his pattern but she was at least proud of herself for having closed her eyes when she felt his rough lips touch hers. She's heard so much about how first kisses were usually messy and super awkward but she hadn't, one: expected her first kiss to be a heated one and two: even imagine in her wildest dreams that her first kiss would be with Bakugou!

How the heck did they even end up like this?

Bakugou kept one hand holding both her wrists high above her head as his freed hand traveled down to caress her neck as he calmed down his pace and began peppering kisses all over her face and neck.

Ochako felt overheated at the sudden development. It was too much, too fast for her brain and heart to process. She knew that if he was only doing this to get her back for sassing him then it'd be cruel on his part but somehow, maybe as denial-territory sounding as it was, maybe he wanted this as much as she wanted it too.

Katsuki Bakugou was many things but one thing he wasn't was someone who took relationships lightly. He wasn't the type to seek a rebound nor the type to fool around with just anyone either. He wasn't a heartless asshole like many liked to paint him as. He has morals.

He could've easily ruined the moment by bringing Deku into this but chose not to. For once, his quick thinking and battle tactics would not be of any use to him as he buried his own grave now. He couldn't bring himself to stop when he nipped on the nook of Ochako's neck a little too hard and heard her moan in a mix of pleasure and a pained squeak. He was sure of it by now that she'd shove him off and send him off into space. But it never came as he lapped with his heated tongue at the red bruising skin of the small hickey to soothe the throbbing ache of it.

Whatever had brought this about betrayed all traces of his own rules. He could look all he wanted but never touch. While he was serious about relationships, relationships were never serious about him. That was how he was dumped even though this time, he was true to his word that the girl he had been seeing was a bitch and a whore. He had planned on ending it on his own terms in person because he isn't a monster but she apparently had other plans. He kept thinking, while mulling over it in the confines of his room, good riddance, because he was furious about being cheated on.

Love was bound to backfire and blast him right in the face. It always did. And Uraraka was someone he seriously did not want to screw things up especially with not knowing how she felt about him. He didn't want to drag her into the mess that was dealing with him because he was work.

So again, he was a dumbass who had no filter during a heated moment of blossoming teenage passion.

He left her lips kiss swollen and her neck marked.

Her eyes still screwed shut and brain frazzled even more now than before.

He let go of her wrists as he moved her arms to wrap around his broad shoulders. Leaning his sweaty forehead against her warm one, he sucked in a sharp breath and let it out to collect his inner thoughts.

Bakugou doesn't know what compelled him to say it.

Blame it on his teenage hormones or high testosterone levels.

"Do you want me?"

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Done! To be continued.

Uhuhuhu things got a little bit heated there.

I honestly don't know how long this idea will be but just that I really wanted to write it out or else it'd just consume me and nag me until I did something about it. I know that secret dating au's are a popular trope for this ship but I'm sucker for them and wanted to write my own~

I don't own Ochako Uraraka or Katsuki Bakugou and all other characters mentioned or those that will be used in this fic – Boku No Hero Academia is owned by Kohei Horikoshi.

I just own the idea/plot/story/whatever you want to call it~ lol :P

Please do review! Follows and Alerts tell me that you guys are at least interested in the story but reviews really let me hear out what your feedback and personal opinions on my stories are!

If anyone is afraid to leave reviews due to language difference - please don't be! I can fluently read Spanish and partial French! :) And hey, that's why Google translate was invented after all! LOL.