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Slow Sparks Burn the Brightest

Summary:

After Mineta gets expelled from class 1-A in their third year, Aizawa brings in a new student to replace him. And a certain loud blond with an electricity quirk falls for him.

TW: Mentions of Abuse, Homophobic and Transphobic language. It doesn't happen in every chapter but we put warnings in the chapters it does happen

Notes:

Hey hey hey people!!! My friend Ei and I have partnered up for another fic! This time, you're going to get some ShinKami action!! Just some notes before we get started:

First, this chapter SPECIFICALLY has a lot of transphobic language towards the trans characters in this fic, so if you want to skip this chapter, by all means, go ahead.

Second: for those who want to skip the chapter, here is what you will miss

- Denki comes out as Trans (He/They) to the Bakusquad during their first year
- Bakugou and Kirishima become a couple during their second year
- Kirishima gets top surgery during the summer leading up to their third year
- During the first day of class 1-A's third year, Mineta outs Kirishima and Kaminari to the rest of the class
- Mineta is extremely transphobic
- Aizawa finds out and brings Mineta to Principal Nezu's office

 

If there are any Content Warnings or Trigger Warnings in later chapters, we will post them at the beginning of every chapter so you as the reader can have the choice to skip the chapter if it will be beneficial to your mental health!

Okay! Without further ado, enjoy the chapter!!!!

Chapter 1: I have been waiting for this for three years

Chapter Text

Denki Kaminari had been friends with the self proclaimed Bakusquad since the beginning of his first year at UA Highschool but there was a secret that he had kept from his close friends because of his own anxieties about it. However, one day halfway through his first year, Mina asked the group a question that scared him. 

 

“Okay we’ve all been friends for a while, but there’s one thing I don’t know! If you are comfortable with sharing, what are everyone’s pronouns and sexualities? Mine are She/Her and I’m Pansexual!” Mina said with a smile. Denki wasn’t nervous about his sexuality, but he had always been nervous about his gender identity since there were situations in the past that didn’t turn out well when he came out. Slowly, everyone went around saying their pronouns and sexualities.

 

“They/Them, Aro and Pansexual” Sero said, their arms around wrapped around Mina’s waist and their head laying on her shoulder, making her smile softly. 

 

“He/Him and gay.” Bakugou huffed quickly. It wasn’t that he was embarrassed, he just wanted to get it over with. “And I honestly don’t give a fuck what people call me. I just prefer Masculine pronouns.” He added before going quiet again. 

 

“He/Him and gay as well! Up top Bakubro!” Kirishima cheered and raised his hand to give Bakugou, which was met with a scoff from the explosive blonde but he reciprocated the high five anyway. Jirou, who was an honorary Bakusquad member since she was best friends with Denki, chuckled softly at the interaction and shook her head.

 

“Got a problem, earjack?” Bakugou glared at Jirou. They shook their head and laughed more. 

 

“Not at all, man. Just thought of something.” She brushed off and addressed the group. “She/They and hella bisexual.” She said before looking at Denki. She could see how nervous he was getting the closer it got to his turn. Jirou moved a little closer to their yellow haired best friend and softly took his hand in their own. 

 

“It’s okay, Denks. Only share what you’re comfortable sharing.” Jirou reassured, which was followed by a chorus of agreements from everyone including Bakugou. Sero smirked at Bakugou, knowing that the group had slowly been making Bakugou go soft. Bakugou growled at them.

 

“What, soy sauce? I may be a dick, but i’m not that much of a dick to make someone uncomfortable.” Bakugo huffed out to them, still not using the word “friend” but unknowingly implied that Denki was indeed a friend. The Yellow haired boy nodded softly and took a deep breath. 

 

If there’s anyone that will accept me, it’s them Denki thought to himself. There were nonbinary people in this group and it filled him with a slight sense of ease. 

 

“U-Um… I’m Bisexual. And my pronouns are H-He/They.” He slowly stuttered out slowly. It was the first time that he actually told a group of people his pronouns and Jirou couldn’t help but smile. “B-But I prefer He m-more than they.” He quickly added before going silent. But what he was met with made him smile. 

 

“Right on, man! If you need any binders I have plenty that could fit you! I’m trans too!” Kirishima said with a proud smile on his face, which made Bakugou smile softly. Mina and Sero smiled as well. 

 

“I could tell that took guts, Denks. We got your back, okay?” Sero encouraged softly. Denki smiled more, completely and utterly relieved he found a group of friends that genuinely accepted him for who he was. Mina jumped up from Sero’s lap and walked over to Denki, engulfing him in a hug. 

 

“Of course we have your back, babes! Thank you so much for trusting us.” Mina said softly. Denki hugged back and tried to fight back the tears that were welling in his eyes. 

 

“Thanks guys. Thank you so much.” Denki said and sniffled softly. The rest of the Bakusquad gave Denki a group hug except Bakugou, who just patted him on the back.

 

~~~

 

When second year rolled around, The Bakusquad’s bond grew closer. They were all like each other’s chosen family. However, Denki had to deal with both Kirishima and Bakugou ranting to him about their feelings for the other person. And the entire Bakusquad was starting to get fed up with the insufferable pining. Sero walked over to Denki, who was in the dorm lounge, groaning and laying their head on his shoulder. 

 

“I swear to god if I have to hear Kirishima whine about Bakugou one more time today, I’m going to fucking explode.” Sero groaned, making Denki chuckle. 

 

“Yeah and you thought my Jirou phase was bad.” Denki and Sero both laughed at the memory. Denki had a crush on Jirou halfway through their first year, but Jirou shot it down right away saying how they were better as friends anyway and that she wasn’t interested in anyone. Denki took it like a champ and was also glad that they didn’t start dating. 

 

“Oh geez, you are nothing compared to those pining idiots. Like how oblivious could they be?” Sero laughed out, shaking their head. Denki wiped a tear that was forming from laughing so hard, but he slowly recovered, catching his breath. 

 

“I’m just hoping one of them gets the balls to confess.” Denki said softly. Sero nodded dramatically in agreement and sat up. Almost like a call from the heavens, Kirishima and Bakugou walked into the dorms, sweat showing on their skin most likely from training, and went to the kitchen. Denki, being the nosey person he naturally was, turned his body on the couch to face the kitchen, Sero followed immediately after with wide eyes. Bakugou opened the fridge to grab some water for both himself and Kirishima, which made his back muscles more defined as he opened the door. Kirishima was practically drooling at the definition until he was snapped out of his daze by Bakugou waving his hand in front of the other boy’s face.

 

“Oi, shitty hair you good?” He asked, handing him the other water bottle. Kirishima blinked and chuckled nervously. 

 

“Hm? Oh! Yeah. Peachy. Thanks Baku!” He grabbed the water, opened it, and took a couple gulps in the hopes that the water would cool his blush. Bakugou rolled his eyes and started to walk away, but Kirishima stopped him by grabbing his wrist. 

 

“Bakugou wait!” He said, his eyes widening as if he didn’t mean to say that out loud. Bakugou turned to the redhead, confused. 

 

“What? Are you sure you’re okay? I swear to god if you’ve been wearing your binder for too long again-” He started to say softly but Kirishima cut him off.

 

“I like you Bakugou!” He blurted out, his eyes widening more at his unknown confidence. Denki covered his mouth to hide the gasp that fell from it. Sero’s eyes looked so wide they were about to pop out of their skull.

 

“I like you too, dumbass. That’s why we’re friends” Bakugou huffed but Kirishima sighed and tightened his grip. 

 

“No, man! I mean yeah we are friends, but not that kind of like!” Kirishima stammered out, suddenly unable to find the right words to say. Bakugou’s confusion started to turn to irritation at Kirishima’s incoherence. 

 

“The fuck are you trying to say, shitty hair?? If you don’t wanna be friends, then fucking say-” Bakugou was cut off by Kirishima’s lips smashing against his own. Denki gasped and grabbed Sero’s arm tightly. 

 

“No fucking way!!!” He whispered to Sero, whose jaw was dropped completely. Bakugou was taken by surprise, but kissed back, wrapping his arms around the boy’s waist, a deep exhale leaving his lips. He slowly deepened the kiss as their breath intermingled and their bodies became glued together by the sheer attraction they had for each other. However, Kirishima pulled away slowly, catching his breath as he did so. 

 

“I-I didn’t think you’d actually like me, Katsuki.” Kirishima breathed out, still trying to catch his breath. Bakugou looked at him in confusion. 

 

“What do you mean? Of course I would, Eiji.” Bakugou said, his voice uncharacteristically soft. Kirishima sighed softly, looking into the blond’s eyes.

 

“But you’re gay! And I’m...I’m not technically-” Kirishima started to say, but was cut off by Bakugou’s finger pressing between the redhead’s lips. He smiled, genuinely smiled, and shook his head. 

 

“You’re just as much a man as I am Eijiro. The manliest man there is. No matter what anyone says. Got it?” Bakugou said fondly, making Kirishima tear up with a smile. He hugged the slightly smaller man tightly and sniffled. 

 

“Thank you Katsuki. So so much.” Kirishima said softly against Bakugou’s neck. Bakugou answered by softly pulling Kirishima off of him and slowly brought his lips back to Kirishima’s. The redhead’s eyes fluttered shut as he kissed back and pulled the blonde closer. 

Sero almost squealed but stopped themself before the two of them revealed that they were in the area. Denki quickly pulled out his phone and took pictures of the two boys in the kitchen and proceeded to send them to a group chat the Bakusquad had without Kirishima and Bakugou in it called “KiriBaku Protection Squad” with the caption ‘THEY FINALLY DID IT!!!!!!’ The chat blew up with Mina and Jirou sending congrats, reliefs, and emojis. They were finally free from the almost year long pining between the two boys and were very grateful they finally got together.

 

~~~

 

Kirishima walked into the classroom, shirt unbuttoned and school jacket in hand. The bakusquad said they were showing up into class early that day to talk about the summer and everyone wanted to see each other after Kiri had been basically bedridden for the last couple weeks of the summer. 

 

“Kirishima!” The short blond man yelled as he saw him. “Your chest looks great!!” 

 

“Hey Kami.” The redhead said back to him, pulling his chair out and sitting down with the rest of the group. “I’m really happy with how it turned out, and how I healed.”

 

“God! I can’t wait until I can get top surgery.” Kaminari exclaimed, throwing his hands back overdramatically. 

 

“I’ll finally be rid of these things, and maybe I’ll be lucky enough to have a partner that’ll help me too.” He added, gesturing to his chest. Mina was about to tell Denki how he could get any partner he wanted, but noticed Bakugou smiling at Kirishima’s confidence with a smitten look in his eyes.

 

“Oh my god! Has Bakubabe gone soft?” Mina asked, looking at him while smiling. Bakugou blinked at the mention of him and let out a low growl.

 

“Shut up Racoon Eyes.” Bakugou said, turning to glare at the pink haired woman beside him. 

 

“Yea, Katsuki helped me a lot with healing the last couple weeks.” Kirishima butted in, before his boyfriend could kill the girl. 

 

“You’re such a simp!” Mina said while laughing. 

 

“SO WHAT IF I AM RACCOON EYES!” Bakugou said, now standing up out of his chair. 

 

“Babe! Don’t kill Mina!!” Kirishima said standing up quickly to grab his boyfriend before flinching at a pain in his chest. 

 

“Fuck” He mumbles, gingerly touching his chest where it hurt. 

 

“What the hell Shitty Hair!” Bakugou said, all his attention switching to hearing his boyfriend in pain. “It’s only been like two weeks, the doctor said it could hurt when you move too fast.”

 

“I’m fine.” Kirishima says, looking up with a weak smile on his face. 

 

“No you’re not, Aizawa-Sensei already knows too, so you know you aren’t participating in training right now.” Bakugou glared at his boyfriend, Kirishima knew he meant no harm, but also knew he would get yelled at if he did take it too far and hurt himself. 

 

“I’m glad to have started T this year though!” Kaminari said, trying to change the subject a tiny bit. 

 

“Yes, and then you won’t have to wear your binder during training anymore.” Sero scolded him. 

 

“...I don’t wear it all the time during training…” Denki said slowly, which only earned him a parental shake from Sero’s head. 

 

“Still doesn’t hide the fact that you wear it during training, Kami. You have to be careful!” Sero said, a slight worry in their voice. Denki sighed softly, knowing that there was absolutely no point in arguing with them. He let out a defeated sigh and nodded his head. 

 

“I know Sero. I just don’t want everyone knowing yet. I know mostly everyone would be okay with it, but what about the people who wouldn’t?” Denki pondered, laying his head in his arms on the desk. Sero sighed, knowing the feeling of dread and worry with coming out all too well. They walked over to Denki and placed their hand on his shoulder. 

 

“Coming out is your choice and only your choice. And you have us in your corner, remember?” Sero said, their voice reassuring. Mina wrapped her arms around Sero and nodded. 

 

“Yep! We got you Denks! We’ll bat for you the entire way!” Mina smiled, making Denki smile more. 

 

“And if any of those extras have shit they wanna say, they can answer to my fists, dunce face.” Bakugou said, raising his hand to let off a couple pops and sparks with a smirk. Denki chuckled softly and sat up again. 

 

“I know. Thanks guys.” He said softly. Just then, The other members of class 3-A started to enter the homeroom and made their way to their seats. As expected, Iida and Momo were the first people to arrive. Iida, as expected, bowed and greeted the group.

 

“Good morning! I hope you all had a good summer!” Iida practically declared. His tone was as authoritative as ever, which made Sero chuckle softly.

 

“Looks like you haven’t changed at all, class prez.” They said softly, making Mina chuckle and nudge them softly. 

 

“Oh my god, Sero hush!” She said, trying to stifle her own chuckles. Iida raised a confused eyebrow but shook it off and made his way to his normal seat. 

 

As time passed, the rest of class 3-A entered the room, sitting at their desks, and started to chatter amongst each other about how their summer went. Aizawa-Sensei hadn’t made it into class yet, which wasn’t a surprise. You were lucky to see that man show up on time let alone early. Multiple different groups were talking around the room. One of the conversations heard was Todoroki and Midoriya had finally gotten together after pining for each other since the sports festival in first year. Another could be heard about Yaoyoruzu’s family vacation that she was able to invite one friend to, so her and Jirou were going on and on about how beautiful Rio, Brazil was. It wasn’t until 3’6” purple haired boy stood up on his desk that everyone quieted down. 

 

“Everyone I have some very interesting news to share with all of you!” Mineta yelled so everyone could hear him. 

 

“What on earth could he be sharing?” Ojiro whispered, looking over to the invisible girl beside him.

 

“Maybe he’s finally becoming a decent human being.” Hagakure laughed quietly as she whispered back to the tailed man beside her. 

 

“We have all been deceived by two people in this classroom.” Mineta started, still standing on his desk. Everyone looked around quizzically, was this about the traitor rumor that went around during first year? 

 

“What hell do you mean small fry!” Bakugou was the first to speak up, trying to get whatever he wanted to say done and over with. 

 

“Kirishima and Kaminari are actually girls!” Mineta said, smiling at the class. Kaminari was listening intently until that moment, the panic setting in the back of his head. 

 

“What the hell did you just say you little runt!” Bakugou stood up from his seat, sparks coming from his palms. Kirishima got up quickly to stop him, grunting in pain from moving his chest too fast. Bakugou turned around quickly, more focused on making sure his boyfriend was okay.

 

“You know Bakugou, it’s weird…” Mineta continued. “You say you are gay, which I didn’t understand how you could be, but you are literally dating a woman right now!” 

 

Kirishima looked at Bakugou in shock as the words left Mineta’s mouth. 

 

“Katsuki…” Kirishima whispered to him to try and calm him, seeing the rage in his eyes as Mineta held a smug look on his face. “He’s not worth it.”

 

“Ei...Let. me. go.” Bakugou said, trying to get out of his boyfriend’s grip. “Let me go Eijirou! I’m going to kill that little runt!” 

 

Soon Mina and Sero were out of their seats trying to get Bakugou to calm down. Denki’s breathing started to get heavier and shorter as the realization hit him. They knew. He was just outed to the entire class. Denki couldn’t move as he started to hyperventilate. Jirou noticed and was immediately by the boy’s side with a hand on his back. 

 

“Hey, hey Denks. Breathe with me okay? Can you look at me?” Jirou’s voice was calm and collected, knowing how Denki could get when he had a severe panic attack. Denki slowly looked at Jirou, the corners of his vision blurring fast. Jirou smiled softly and nodded her head in approval. 

 

“Good. Good. focus on me and my voice, okay Denki? Follow my breaths.” They said softly as they exaggerated their breathes enough for Denki to eventually follow along. Denki started to breathe normally slowly but surely but was still panicking at the scene that was unfolding.

 

“Hey Kirishima!” Mineta continued despite the reactions happening around him. “I see you got rid of your boobs! I didn’t even have to look in the girl’s locker room if you two were in the men’s!” 

 

The grip Kirishima had on Bakugou loosened as Mineta continued. His breathing picked up a little but not enough for his anger ridden boyfriend to notice, and before long, without realizing it, his grip was gone off Bakugou. Kirishima had wrapped his jacket around him tighter in an attempt to cover his chest. Bakugou took a step forward without thinking but stopped himself. 

 

“Changed your mind Shitty Hair?” He said, laughing while turning back to see his boyfriend, who’s breathing had only gotten quicker since his grip had loosened. He was staring off into space, not registering a thing Bakugou had said.

 

“Shit Ei! What’s going on? Look at me.” Bakugou said as soon as he saw the panicked state Kirishima was in. “Breathe with me ok?”

 

“Are you fucking kidding me?” Mina said, her voice dangerously low and coated in venom at the small boy. Her fists balled so tightly they were white. Sero was in the same stance, but towering over Mineta. 

 

“You’re lucky I’m even saying this, but you have five seconds before I pummel your ass into the fucking ground.” Sero seethed, their eyes dangerously dark. The entire class was shocked at the things Mineta was saying. Sure, he was a jerk and said things that were out of line, but this was a whole new level of fucked up. Slowly, other members of the class were standing and going over to where Sero and Mina were, ready to join them while Momo went by Jirou’s side to help calm Denki and Todoroki and Midoriya went to Kirishima and Bakugou’s side to help with whatever they needed. Soon Mineta was grabbed off his desk with Aizawa’s capture weapon. 

 

“What is going on here?!” Aizawa said, looking around the classroom. “Someone has 30 seconds to explain before I drag you all to Principal Nezu’s office for threatening a classmate.” 

 

“You see sir…” Mineta started before the capture weapon moved in front of his mouth. 

 

“Well let’s see. Mineta is a transphobic dick who doesn’t know how to be a fucking decent human being nor have the ability to keep his fucking mouth shut.” Iida spat out, not caring about his language for once. The entire class turned to Iida, completely shocked that he even knew how to curse. 

 

“Calm down, Head of the murder squad.” Tokoyami said, looking towards Iida. 

 

“Pretty much. Eloquently said, Class rep.” Mina said at the same time as Tokoyami, still trying to keep her rage down. Aizawa saw how enraged his class was, eyes widening slightly when Iida spoke. He knew it was serious if Mineta broke the class rep, who was always authoritative and strict. 

 

“I think I have heard enough here. Class, I will return shortly. Can you make sure Kirishima and Kaminari are okay?” He said, his voice coated in ice as he walked out the room, Mineta still wrapped in his capture weapon as he practically bolted down to Principal Nezu’s office. 

 

“I’ve been waiting for this for almost three years.” He said, more to himself as he walked into Nezu’s office. Justice was going to be served once and for all.