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As Kacchan was apologizing, Izuku couldn't believe his ears.
"Izuku... I'm sorry for everything."
Words he'd never expected, or even really thought about wanting, to come out of Kacchan's mouth.
He could only (barely) stand there and listen in shocked silence as Kacchan finished his speech. A wave of regret washed over him as he realized how cruel he'd been to the people he cared about so much. The people he'd learned so much from.
"I'm sorry I said something so awful."
Unable to stand anymore, he mentally braced himself for the fall before strong arms covered in grenade gauntlets caught him. Before he passed out, he heard, "We get it," coming from that raw voice.
After the debacle with the protesting citizens was handled, he'd been wrestled inside the dorms. He washed, ate, was treated for his injuries, and slept. In the late evening three days later, after his physical condition had improved, he finally had some time to himself to process everything. Process Kacchan.
He'd been avoiding thinking about Kacchan too deeply for years. Seeing Kacchan take that hit for him only exacerbated that tendency because he couldn't understand it. Why had Kacchan done that? For him?! They were on better terms now, but that was such an extreme action for Kacchan to take.
And then Kacchan laid his feelings bare and said his body moved on its own. Just like he had when the sludge villain happened two years ago. Izuku thought about how Kacchan had changed towards him since their fight at Ground Beta. How Kacchan had been less hostile and voluntarily helped him with his training. How he'd followed him into battle when he tried to sneak away. How Kacchan came and found him before he lost himself to Dictator's pawns. How Kacchan stayed beside him and urged him not to do this on his own. How he voiced his support and growled at the citizens that didn't want Izuku at UA.
Izuku found himself accepting a hard truth: Kacchan cared about him. Deeply. And he did too.
Before he knew it, he was rushing out of his room and up to Kacchan's. He knocked on the door and a startled Kacchan let him in. They hadn't properly talked since the apology three days ago when Izuku had been too overwhelmed to say much of anything. The priority had been getting him to stay at UA, accept help, and improve his physical condition.
"De-Izuku, what's going on?" Kacchan asked softly. He looked unsure of himself like he didn't know how to act.
It was as if their positions had been reversed. For so long, Izuku didn’t know how to act around Kacchan; he took his cues from him. Kacchan was waiting for Izuku to set the tone.
“Now I don’t expect this to change a thing between us,” Kacchan’s voice, clear and steady while he took accountability for his actions, wavered and grew emotional as he showed Izuku his genuine remorse. Izuku found himself wanting to comfort him.
Oh, how Izuku wanted things to change.
"Kacchan, I forgive you. I always did."
Kacchan bowed his head forward so that his hair hid his face; a movement he often made when he was emotional.
"I was so devastated when the league took you away. It was a total loss. Then when you pushed me out of the way and Shigaraki stabbed you instead of me, I couldn't let myself think about it too much because I knew I'd fall apart. And I had to protect everybody. Had to protect you. So I left.
"But you're right. I was doing what had to be done but doing it on my own wasn't working. I want you by my side, Kacchan like I always have."
He stepped forward and took both of Kacchan's hands in his. He ducked his head forward to make eye contact. There were tears in Kacchan's eyes and his body had started to shake.
Once again, Izuku's body made his decisions for him and he leaned up to place a gentle kiss on Kacchan's lips. His first kiss.
Izuku leaned back to catch Kacchan's eyes again and Kacchan stared back at him, wide-eyed. He looked so beautiful and vulnerable, Izuku went in for another kiss. This time, Kacchan melted into him and kissed back. Izuku felt so relieved, he let go of Kacchan's hands to wrap his arms around Kacchan's trim waist and held him close. Kacchan's arms wrapped around his waist in return and they eventually found a rhythm, fumbling along the way.
After a while, the kisses started feeling incredible as they got the hang of it and Izuku was getting drunk on it. Kacchan made the sweetest little whimpering noises and Izuku wanted to make Kacchan make more sounds. Bigger sounds. It was like a challenge he couldn't resist. He wanted to catalogue all this new information he was learning about Kacchan.
They both started moving towards the bed and sat down heavily on it. Izuku finally let his hands wander over Kacchan's wondrous torso while Kacchan clung to the back of his shirt. His hand brushed over Kacchan's left shoulder and he felt him wince.
Izuku separated their lips and looked Kacchan in the eye as he bent to place a soft kiss on his bandaged shoulder.
"Thank you for saving my life, Kacchan."
"D-Izuku, when those spikes were coming at you, I felt like I was going to fucking die. I just couldn't let that happen. I had to tell you how I felt. You had to know how sorry I am."
Tears were falling down Kacchan's face in earnest now. Izuku melted at the sight of the remarkable person in front of him. He couldn't believe how blessed he was.
"I know now, Kacchan. I'm sorry too. I’m sorry that I didn't come to see you and only wrote you that letter after you saved me. I knew I wouldn't be able to leave if I saw you."
"Yeah," he scoffed, "I would have knocked some fucking sense into that dumb green head of yours."
"Well, you have now. I'm not going anywhere without you."
Kacchan flashed a smile at that as Izuku took Kacchan's face in his hands to devour his mouth once more. They repositioned themselves so Kacchan was flat on his back with Izuku on top. Izuku swiped his thumbs over Kacchan's wet cheeks in a futile effort to dry them. Kacchan's moans lit a fire in Izuku's belly.
He moved his lips to Kacchan's long neck, sucking, kissing, and lightly nipping at his skin as Kacchan held onto him even tighter. Izuku found his pulse point and sucked.
"Hah! Deku!"
Izuku smiled. "You can call me Deku, Kacchan. I know you don't mean it like you used to. It's your name for me like Kacchan is my name for you."
Kacchan gave a sob and Izuku pulled away from his neck to look at him tenderly. Wanting Kacchan to focus on more pleasurable things, he ground his growing erection against Kacchan's.
"Can I?"
Kacchan looked unsure for a moment. "I've never..."
"Me neither, but you make me feel brave."
At those words, a determined expression settled on Kacchan's face. He sat up and took his shirt off, favouring his injured shoulder.
Izuku had seen Kacchan shirtless several times before, but context is everything. Kacchan's stomach and shoulder were still wrapped in bandages, proof of how far he was willing to go for Izuku. Proof of how much he cared.
Izuku beheld the sight with reverence. He didn't think about how he could have lost Kacchan and chose to focus on this act of love. If they work together and protect each other, they may be able to avoid injuries like these in the future. He placed another soft kiss over the abdominal bandages, feeling thankful Kacchan survived.
He moved to those glorious pecs, kissed the centre of Kacchan's chest, and then ran his tongue over a pert pink nipple. Kacchan's breath hitched and his back arched. Encouraged, he circled his tongue over the pebbled nub, closed his lips around it, and sucked.
"Fuck!" Kacchan's wrecked voice exclaimed as his sweaty hands jumped to Izuku's hair to hold his head in place.
He continued his ministrations until both Kacchan's nipples were red and puffy and Kacchan was squirming beneath him, swearing hoarsely. Izuku felt that same determination he experienced in battle. He was going to show Kacchan that he did want things to change between them. He wanted them to be as close as possible. He wanted to love Kacchan and for Kacchan to love him in return. He wanted them to be partners in every way. They'd spent enough time apart. He knew where Kacchan stood now and Izuku had finally stopped avoiding his own feelings.
Izuku pulled away from Kacchan's chest and ran his hands down Kacchan's sides to pause at the waistband of his sweats.
"Tell me if you want to stop."
Kacchan shook his head and panted, "Need you, Deku."
"Let me take care of you, Kacchan," Izuku said as he pulled his shirt off.
Kacchan whimpered, "Shit."
He leaned down and gave Kacchan another searing kiss. Their tongues tangled as he pulled Kacchan's sweatpants and boxer briefs down. Kacchan's rock-hard and dripping cock sprang free. Izuku admired its generous size and gave it a couple of tugs while his own cock twitched in his shorts.
Kacchan threw his head back and allowed his shaky legs to fall open. "Deku, I ffffuck-"
"I got you, Kacchan," Izuku said warmly. It felt miraculous to have Kacchan like this. To finally indulge in the feelings he'd denied himself for so long. He'd never imagined he could be with Kacchan like this. Now it was all he wanted.
Kacchan looked up at him and more tears fell from his eyes. His gorgeous face was scrunched up with emotion and his cock twitched at Izuku's declaration. Carnal hunger overcame Izuku as he felt the need to pick up the pace.
"Do you have lube, Kacchan? Where is it?"
He pointed at his desk drawers and Izuku practically activated OFA to get there and retrieve the bottle. He didn't want to leave his Kacchan alone for too long.
Izuku may be bashful and inexperienced, but he wasn't naive. Girls could make him blush when they got too close, but Kacchan's trust and love made him bold. He knew what to do.
He took off his shorts and underwear, relieving the pressure on his own aroused cock. He settled between Kacchan's long legs and carefully rubbed a lubed-up finger across his hole. Kacchan relaxed his entrance with what appeared to be practiced ease. He'd clearly done this to himself before if the half-used bottle of lube was any indication.
Izuku slipped that first finger in and Kacchan keened. He was so hot and tight inside; Izuku fondly stroked his walls as he moved his finger in and out.
"More. Please."
Hearing Kacchan plead for him was like sipping ambrosia. He nearly growled as he slipped a second finger in. He stretched Kacchan's entrance, scissoring his fingers as he felt around for Kacchan's prostate. Suddenly, Kacchan's body seized, his eyes grew wide, and his hands scrambled for purchase on the sheets.
"Holy fuck, Deku! R-right there!"
Izuku applied consistent pressure, while not giving Kacchan quite enough. Kacchan was so emotionally fragile right now, he wanted to take things slow. Savour their first time. They'd have many opportunities to go hard and rough later; Izuku would make sure of it.
He added a third finger, spread them all wide, and moved in and out at a steady pace. Kacchan's back arched and his hips shifted as he received Izuku's fingers.
"Ready, Kacchan?"
Kacchan cried out, "God, yes, fuck."
As Izuku pulled his fingers out carefully, Kacchan whined at the loss. He put the head of his thick cock at Kacchan's entrance. At Kacchan's urging, he thrust forward slowly and consistently until he was fully seated in the most wonderful, tight heat. He'd never experienced anything like this before and it made it all the better that he was doing this with Kacchan. The love of his life.
Izuku looked down at Kacchan's face. He was blushing so prettily, lips parted as he moaned and panted. His eyes were tightly shut as he adjusted to Izuku's impressive size.
Izuku couldn't resist. He leaned down so his elbows were on either side of Kacchan's face and kissed him deeply, pouring all of his love and affection into the kiss. Kacchan kissed back as a man starved. His hands grabbed at Izuku's back and pulled so their bodies were pressed flush together.
After a minute, Izuku felt Kacchan relax around him. Still kissing, he pulled out halfway and pushed back in. Kacchan's mouth grew slack in their kiss as he moaned at the new sensation. Izuku pulled his face back so he could watch Kacchan's expressions and ascertain his reactions as he moved within him.
He thrust in and out of Kacchan's mouthwatering body at a steady pace and maintained eye contact as he whispered sweet everythings (not nothings, never nothing when he told Kacchan how much he meant to him).
"You're so amazing, Kacchan, so handsome and beautiful. You feel incredible. I've never experienced anything as wonderful as this. I'm so happy it's you. I love everything about you, good and bad because it makes you, you. You deserve the world and I want to give it to you. Want to be like this forever. Need you at my side, with me, always. You're so strong, my image of victory."
Katsuki felt like he was falling apart as he listened to Deku and experienced the sublime sensation of Deku moving inside him. This was more than he had ever hoped for. Everything he wanted. He couldn't say anything back except he knew he felt the same way. Wanted to be Deku's forever. Loved everything about him because it's what made him Deku.
He couldn't stop crying and his hands wouldn't stop trembling. He was so overwhelmed with need and Deku's love, forgiveness, and praise. He couldn't do much more than audibly exhale in time with Deku's thrusts as each one forced the air out of his lungs and cling onto Deku's well-muscled back as the immense pleasure rose up within him.
"D-Deku. I can't. 's too much," he somehow managed to choke out.
"You can. I'll get you there, Kacchan."
With that, Deku paused his thrusts, wrapped his arms gently around Katsuki's torso, and lifted him up so he was straddling Deku's lap, his big cock still inside him. Deku had even managed to not jostle his injuries too much.
The show of gentleness and strength (classic Deku), change in angle, and Deku's continued thrusts up into him were all he needed to come undone. Untouched, he writhed and shook as he spilled his seed between them. Katsuki gave a wordless, broken cry and was almost terrified at the intensity of his orgasm, never having cum that hard in his life.
As Kacchan fell apart in his lap, his hole squeezed around Izuku's cock. The contracting sensations pushed Izuku over the edge and his own orgasm hit him like a ton of bricks. Both boys clung to each other and gently ground against one another as they rode out their highs.
When they came down, Kacchan slumped forward onto Izuku's chest. Izuku maneuvered them so they were lying down on the bed, face to face, their arms around each other's waists.
Izuku observed Kacchan's tear-streaked cheeks, dazed red face, and drool-covered lips as he slowly regained his wits. As much as Izuku loved seeing Kacchan like this, loved being the only one to see him like this (for the rest of their lives if Izuku had any say on the matter), Kacchan wouldn't be Kacchan if he stayed like this. Izuku had taken Kacchan apart and now it was time to put him back together again.
Izuku smiled at his lover and brought a hand up to Kacchan's face to ground him and get his attention. When Kacchan's red eyes cleared and made lucid contact with his, Izuku asked, "Wanna spar? As you might have noticed, I've got a few new quirks to try out."
A look of relief crossed Kacchan's stunning features before he grasped the hand Izuku had placed on his cheek, squeezed it, and flashed him a sharp grin. "You're on, nerd."
They still had a war to fight and a formidable enemy to defeat. But now that Izuku had Kacchan and the others, he was feeling hopeful they'd save and win.