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It had been a few days since Katsuki had returned from his three-week absence and he was still feeling a bit sore. Especially after the dressing down his guild master had given him for his reckless behavior.
But none of that mattered to Katsuki because today was the day. Today Deku’s heat was going to start. His arrival had triggered the final stages of Deku’s preheat and he had awoken to a messenger from that Yagi guy telling him Izuku wouldn’t be coming into work the next few days since he was going to be… indisposed and if maybe Katsuki could look after him like he had promised?
And that was the best part about this glorious day: Deku had asked Katsuki to spend his heat with him. Deku had said he loved him and that he wanted to be with Katsuki forever.
So Katsuki grabbed his satchel, which he had already filled with everything he would need, and headed out. Deku lived in a small bedroom over the alchemy shop, so the way was familiar to Katsuki and in his excitement, he was practically running through the streets. When Katsuki opened the door to the shop he was greeted with the sight of a tall, thin man with blond hair and piercing blue eyes that seemed to have sunken into his skull.
“Ah, young Bakugou!” Yagi greeted him with a smile. “Thank you for coming. I trust you know where to go?”
He nodded in agreement and thanks and moved past the counter to a door in the back of the room. There was something about Yagi that Katsuki couldn’t explain. His spirit seemed to be larger than life and there was a hidden strength that he seemed to carry around.
But he only spent a few seconds thinking over this before his mind focused back on more important things, like the Omega waiting for him up the stairs. He was a bit confused when he reached Deku’s door and still wasn’t able to smell anything related to an Omega in heat but then he noticed the herbs pinned to the door. They had a subtle, but refreshing scent and Katsuki knew they were part of the ingredients for the scent-concealing cream that Deku made. He must’ve used them to keep his scent inside his room.
Katsuki felt another surge of pride for his Omega course through his body. Not only was he smart and inventive he also was able to keep anyone away from smelling what was Katsuki’s and Katsuki’s alone. His inner Alpha rumbled pleased in his head, the pre-stages of his own rut cursing through his body, while Katsuki knocked on the door.
“Deku, it’s me.”
From inside Katsuki could hear a quiet whine before someone scrambled towards the door. The bolt was unlocked and the door opened a small sliver to reveal a wild head of green curls and a hazy green eye.
“Kacchan?”
Without conscious thought Katsuki let out a low rumble, starting deep in his chest and he could see Deku’s instant reaction. The already dilated pupil seemed to take over the eye entirely and Deku let out an answering croon before opening the door wider. He grabbed at Katsuki’s arm and practically pulled him inside his room. Katsuki had just enough time to lock the door behind him before Deku was all over him.
His Omega - and didn’t that thought send a thrill through Katsuki, Deku was his Omega now, finally after all this time and Katsuki’s own fuck ups Deku was finally truly and really his - threw his arms around Katsuki’s neck and hooked one leg around his waist in his quest to get as close to Katsuki as possible. His face was pressed tightly to Katsuki’s neck, rubbing their scent glands together almost aggressively.
“Alpha,” Deku whined out in a needy, high voice and if Katsuki had any restraint left in the first place it was gone now. His hands grabbed Deku’s ass and hefted him higher, their crotches rubbing together and creating the most delicious friction. Deku smelled like heaven and Katuski couldn’t wait to return to his rightful place between his Omega’s thighs and give him the worship he deserved.
He quickly crossed the small room towards Deku’s bed and nest, kicking off his boots in the process. He carefully climbed inside, making sure his precious cargo was still held securely, and lowered Deku down into the soft sheets and pillows he had scavenged previous to his heat. Katsuki was delighted to spy a few of his own clothes he had given Deku in the last few days to prepare for today.
“Such a good Omega,” he said, his lips trailing from Izuku’s forehead towards his ear. “Building such a beautiful nest for us. Guarding your door and your scent against other Alphas. Being so perfect for me.”
Deku mewled underneath him, his body and hips rolling against Katsuki’s in search of friction and the desire to get closer.
“Kacchan,” he whined again and Katsuki shushed him with a gentle kiss against his soft lips.
“Don’t worry, love,” he said as he trailed more kisses down Izuku’s neck towards his scent gland. “Kacchan is going to take care of you now.” He gave the gland a long lick before closing his lips around it and sucking. Izuku keened and Katsuki grinned in satisfaction.
He bypassed Izuku’s half-open shirt and went straight for his soft sleep pants. He gently pulled them down Izuku’s legs and was hit with a new wave of pheromones and the delicious scent of Izuku’s slick. The inside of his thighs were already glistening with it and his hole was pink and fluttering, expelling more the longer Katsuki stared at it.
“Kacchan,” Izuku whined and buried one hand in Katsuki’s hair to try and tug him closer. “Need you.”
“I’ve got you, baby, don’t worry,” he answered before throwing away his cape. Besides his pants, he was completely naked and he wasted no time in crawling toward his goal. He licked along Izuku’s perfect thighs, leaving kisses and bites on his way toward the place where both of them really wanted him to be right now. Izuku tugged on his hair to get him to hurry up, but Katsuki was determined to take his time.
It had been way too long since he had been this close to Izuku and he wanted to indulge a bit. With a slight pang, he remembered his last rut, his desperation and loneliness, and the anger and frustration of needing his Omega but being unable to find him.
Above him, Izuku let out a low croon and a wave of soothing pheromones wafted over Katsuki.
“Kacchan,” Izuku said, his eyes a bit more clear than they had been before. “Love you.”
Katsuki’s heart felt as if it would explode right out of his chest. He knew he was pumping out pheromones as well, his scent screaming about how happy he was, but for once he made no move to hide it. He wanted Izuku to know how he made him feel, he wanted him to know that Katsuki would do anything and more for him if only he asked.
“Love you too,” he said before he lowered his head again and pressed his tongue against Izuku’s hole. Izuku let out a moan and the glorious thighs around Katsuki’s head tightened.
Katsuki took his time, licking all around Izuku’s hole and even going back to nose up behind his balls and taking them into his mouth too. The whole time Izuku was squirming and moaning, wanting more and unable to get it.
“Alpha!” he shouted and tugged at Katsuki’s hair. “Stop teasing!”
Finally, Katsuki pushed his tongue past Izuku’s loose ring of muscles and was engulfed in his burning heat. He wiggled his tongue, trying to fit as much of himself inside of Izuku as possible, and wrapped one of his hands around Izuku’s small omegan cock to stroke him in time with his tongue.
Izuku screamed and his release coated Katsuki’s face and hand at the same time. Katsuki drank as much of it down as he could, reveling in the sweet taste that he had to live without for so long. He pulled away once Izuku weakly pushed against him, too wrung out by his orgasm and the overstimulation. He carefully moved his jaw around to dispel a bit of the stiffness before crawling back up. He started pressing soft, butterfly kisses all over Izuku’s face until his lover was a giggling mess.
Izuku’s arms wrapped around him and pulled him closer and for a while, they were simply holding each other, still half dressed as they were and covered in all kinds of slick and sweat, but neither of them cared.
At least until Izuku started to squirm against Katsuki again.
“Alpha,” he said, his voice breathy and needy again. “Alpha, I need you. Need your knot. Want you to mark me, make me yours, and stuff me full.”
“Fuck,” Katsuki groaned out before finally pushing his own pants down and releasing his painfully hard cock. Izuku had shucked off his shirt and finally, they were skin to skin, nothing in between and both of their hands roamed freely over their bodies as they kissed and rediscovered all the secret places on their bodies together. But soon enough this wasn’t enough for Katsuki’s needy Omega.
With one twist of his hips and legs, Izuku threw Katsuki on his back and climbed on top of his lap.
“Enough, Alpha,” Izuku said, his eyes almost black with his want and desire and his body a glorious sight hovering over Katsuki like that. “Want you now.”
“Then take me,” Katsuki growled out, a challenge in his voice and a grin on his lips. “I am yours. Claim me, Omega.”
Izuku surged down to take his lips in a hard kiss while one of his hands fisted around Katsuki’s cock. Katsuki groaned against Izuku’s lips as his member was stroked, the precum beading around his tip making the glide smoother. Izuku sat up again and lined Katsuki’s cock up with his entrance before slowly sinking down.
Both Omega and Alpha let out twin groans of satisfaction and pleasure when they finally reconnected again. For Katsuki it felt like coming home and being reborn at once. He was sure no feeling in the world could compare to being joined with his Omega like this. No feeling, no person, and no experience could ever come close to this.
Above him, Izuku started to move, his hips rolling and his tights tensing as he started to move himself over Katsuki’s cock. Katsuki could do nothing but hold on to his Omega’s hips as he rode him.
“Kacchan,” Izuku panted out and started moving faster. “Touch me.”
Katsuki obeyed and wrapped one of his hands back around Izuku’s cock. It didn’t take long for Izuku to come again, small spurts of cock shooting out of his cock and another wave of slick painting Katsuki’s crotch and hips. He slumped over Katsuki’s body, but this time the Alpha didn’t plan on giving him the time to rest. Not when his own rut had been banging against the inside of his head since he had gotten a whiff of Izuku’s scent.
He grabbed Izuku’s hips and rolled them around again before realigning their hips and sinking his still hard cock into Izuku’s wet heat again. He started fucking Izuku in earnest, his hips pistoning in and out of the Omega, who was mewling underneath him, tears staining his cheeks from the overstimulation. His hands were claws against Katsuki’s back and he almost hoped the deep scratches Izuku left behind would scar so that Katsuki could wear the marks of his mate proudly.
“Alpha,” Izuku cried out. “Knot me! I need it! Fill me up, breed me, stuff me with pups!”
“Omega,” Katsuki growled out and his next thrust almost shoved them out of the nest and onto the floor. He could feel his knot threatening to pop and his eyes zeroed in on the swollen mating gland on Izuku’s neck. He lowered his head down and nosed against it, leaving more bites and kisses around it and painting Izuku’s neck with a necklace of bruises.
“Izuku,” he whined, not embarrassed by how needy he sounded. “Can I…?”
“Mark me!” Izuku said, his head lolling to the side and exposing his neck. “Mark me, make me yours, wanna be with Kacchan forever!”
It was all Katsuki needed to fall over the edge. He sank his fangs into Izuku’s neck just as his knot popped past Izuku’s hole and locked them together, his cum painting the inside of Izuku white.
Together they slumped into the bed, their arms wrapped around each other, and Katsuki only barely remembered not to crush his new mate. They rolled onto their sides and nuzzled against each other, their pheromones mixing and creating something completely new.
“Your turn,” Katsuki whispered against Izuku’s curls and offered up his neck for his own claiming bite. Izuku sank his smaller omega fangs into Katsuki’s neck and the sensation was as painful as it was pure bliss and Katsuki couldn’t help but purr at the slow hum in his mind that was Izuku, Izuku, Izuku .
“Kacchan,” Izuku sighed and licked over his new bite to clean it, Katsuki doing the same.
“I’m sorry it took me so long, “ Katsuki whispered a little bit later, his hands tracing idle circles over Izuku’s back while they waited out the tie.
“I’m not,” Izuku answered and pressed a kiss against Katsuki’s chest. “It was unconventional, but without it I would never had the courage to leave home and find myself. I’m glad it worked out this way.”
“Still,” Katsuki grumbled and pulled Izuku closer. “I wish I had helped you. I wish I didn’t hurt you.”
“You did hurt me,” Izuku agreed. “But you also made up for it. You showed me how you feel for me and how much I am worth to you. I couldn’t ask for anything more.”
“I love you,” Katsuki said and Izuku let out a small laugh.
“I love you too, Kacchan. So much.”
And Katsuki knew that this wasn’t an ending to their story. It was only the beginning and he would make sure to show Izuku his appreciation and love for the rest of their lives.