Chapter Text
"Hi, is this Midoriya-san?"
Izuku tucks the phone against his shoulder to pin it to his ear as he moves to stir the ramen on the stove. "Yes, is it!" He says cheerfully. "Who am I speaking with?"
"This is Yoichi from the omega rehabilitation center. I'm calling to let you know that the bond you made with Katsuki has taken hold and you've been approved to take him home. When could you come by to pick him up?"
Joy bubbles in Izuku's chest and he grins to himself, cheeks flushing. "Great! Uhm, lemme check my calendar, hold on…" he shuffles over to his front door, checking over the calendar hanging on the wall. His patrol schedule is penciled on the page in neat blocks of time, along with other noteworthy things like meet Iida-kun for lunch!!! and 2 PM appointment with forensics to go over test results (IMPORTANT).
“Could I get him tomorrow? Maybe around noon?” He asks hopefully, chewing on his lip. “I know it’s the weekend, but-“
“Tomorrow works!” The center worker sounds relieved, agreeing hastily. “I’ll get you put down for a noon appointment, we’re all relieved that Katsuki finally bonded to an alpha and we want to get him home as soon as possible. Do you have all the needed equipment? Because of his quirk, we do recommend-“
“Neutralizing agent, quirk restraint gloves, exchangeable absorption pads- I’m aware,” Izuku rattles off with a slight smile. “I have everything I need, I’ve been looking forward to bringing him home.”
“Wonderful. We’ll see you tomorrow, Midoriya-san!”
Click. Izuku tries not to squirm in excitement as he dials his agency.
“Hero, boss. How’s it going?”
“Hi, Kaminari-kun!” Izuku greets the omega with a pleased tone to his voice. “Can you pass along that I’ll need to lighten my patrol for the next few weeks? I’ve been approved to bring my omega home.”
“Oh man, congrats! Yeah, I’ll let Ei know and he’ll start arranging for the others to cover your shifts, mmkay? Don’t even worry about a thing,” the omega chirps happily. He’s got a good position, working as a personal secretary to Izuku, since his proximity to his alpha, Kirishima, allows him to have a little more agency in the workforce than usual.
“You’re the best,” Izuku says.
“Hah, I know. Good luck, though! He’s from a center, right? I bet you’re gonna have your hands full with him.”
“Yeah, probably- but I wouldn’t have him any other way.”
A few more quick pleasantries later and Izuku is returning to his lunch, giddy with excitement. He does a quick cleanup of his apartment, anxious to make sure it's presentable and safe for his new omega, making sure that his new locks are in place and everything dangerous has been put away.
When the next day rolls around, Izuku ends up being an entire half hour early to the center. He'd be embarrassed about it, if it weren't for the way the staff all look relieved at his presence.
"Midoriya-kun!" The doctor in charge of Katsuki's case greets him with a polite bow and a gesture for Izuku to follow him. "Thank you for coming, we almost couldn't believe it when your mating bond with Katsuki actually took."
"How has he been?" Izuku asks anxiously, following the doctor to a nondescript, padded room with a restraint chair bolted to the floor.
"He was pretty docile the first seventy-two hours after your mating," the doctor explains as he moves over to the other door and presses the buzzer, "about mid-afternoon Thursday he came out of the submission haze and started fighting anyone- or thing- he could even remotely get his quirk directed toward."
Izuku winces. Two and a half days of post-bonding frenzy couldn't be fun for anyone, let alone an out-of-control omega.
The door bangs open and two orderlies drag Katsuki in, the blond omega snarling through the gag that's been worked into his mouth. His arms have been restrained in a typical jacket restraint, his hands covered with quirk suppressant gloves. His angry, burnt caramel scent floods the room as they wrestle him into the restraint chair, forced down to the floor on his knees and locked into place with his head pitched forward and ass out in a typical presentation pose.
"Given his temperament, we do recommend security in the room for this part," the doctor says. Izuku almost laughs- he's a pro hero in the top 50s, he's more security than anyone else in this facility could possibly be- but he swallows it down and nods.
"If that's what you think is best," he says. His eyes wander across Katsuki's restrained form, looking at the rippling muscles and toned body, the sleekness of his entire form even as he tosses his head like a wild beast, screaming wordlessly in fury.
"There's a couple of things to note," the doctor says, pulling on a pair of gloves and moving to kneel at Katsuki's heels, gesturing for Izuku to join him. Izuku does so with interest, watching as the doctor spreads Katsuki's cheeks to reveal his pretty pink anus, already faintly glistening with slick. "First is, of course, that because he's been on black-market grade suppressants for several years, you will likely need to chemically induce his heat to jumpstart his cycle. If you look here-"
Katsuki howls with indignant rage as the doctor uses two fingers to spread him, pressing a third into his slick channel.
"-you can feel that his slick glands have become impacted due to overuse of suppressants and lack of knotting over the years. You'll need to monitor these to make sure they aren't causing him pain and you'll likely need to massage them regularly to help his body start producing the appropriate amount of slick again. Would you like me to demonstrate?"
"Please do," Izuku says, fingers twitching for a pen. He wishes he had thought to bring a notebook, but there's nothing quite like watching the way the doctor starts to firmly massage the inside of his new omega's hole, bursts of slick bubbling free and dripping down Katsuki's taint in messy dribbles as the blond thrashes and cries, his sounds turning more desperate than angry as his dick fills out, starting to drip down onto the floor.
"He's been misconditioned for years to treat his external genitalia as his primary source of pleasure," the doctor explains as he grabs the tip of Katsuki's shaft and strokes up toward the base, squeezing firmly as Katsuki whines. "You may wish to look into caging him to prevent excessive external masturbation until his body has relearned the proper way to orgasm."
"I'll keep that in mind." Oh, Katsuki would look so pretty with his clit caged up… Izuku reaches down to subtly adjust his cock as he stiffens at the idea.
“Because of his temperament, we do also recommend a sedative for the journey home.” Izuku doesn’t miss how Katsuki goes tense and afraid at the idea, something that yanks unhappily at his heartstrings, but he nods.
“That’s probably a good idea,” he reluctantly agrees, trying to ignore the enraged howl coming from his new omega. "I also saw that you offer chipping…?"
"Ah, yes," the doctor strips the gloves off, getting to his feet. "We offer microchips with and without GPS location services, for 4,000 yen without tracking and 6,000 yen with."
"Definitely with tracking," Izuku says with a nod. He watches sympathetically as a nurse comes in with a couple of needles- one gets injected into the side of Katsuki's neck and the other behind his ear.
"Excellent, that's all been taken care of," the doctor says. "We'll release him into your care now, the sedative should have taken effect. It's not a true sedative, it won't knock him out, but it will make him docile and encourage his natural instincts to take over for the time being."
"Thank you for everything," Izuku says with a smile as he pulls out the collar and leash he had brought with him. He kneels down next to Katsuki's head, gently stroking his hair and watching those beautiful ruby eyes flick over to hazily focus on him. "Hello there, Katsuki-kun," Izuku murmurs. "I'm taking you home, sweet omega. Are you going to be good for me?"
Katsuki is sagging into the restraining chair, blinking fuzzily. After a moment, he nods, slow and reluctant.
"Good boy." Izuku carefully unclasps the stiff collar from the center and settles his own into place- it locks shut without any buckle, needing a special magnet to release from Katsuki's neck. He carefully adjusts it and then clips the lead to the ring in the front, before starting to unbuckle Katsuki from the restraining chair.
"That's it," Izuku coos, letting his voice dip into a pleased alphan rumble. "Good boy. Let's get you out of this place."
He coaxes Katsuki into a pair of loose sweatpants provided by the center, leaving Katsuki's wrists bound behind him for the time being. Katsuki's gaze flickers around, assessing, but there's a beautifully submissive blurriness to his motions that has Izuku smiling.
"Come along," he murmurs, gently tugging on the lead, and Katsuki slowly starts to follow. Izuku takes him outside and Katsuki squints into the mid-afternoon sun, tilting his face away- he seems more irritated than grateful when Izuku takes the sunglasses that are part of his public disguise and slips them on Katsuki's face instead, but he doesn't try to get them off his face.
The subway ride home is surprisingly peaceful, Izuku tucks Katsuki into a seat at the back of the car and presses their sides together, stroking his fingers over Katsuki's thigh to keep him calm. Everyone gives them a wide berth, clearly recognizing an omega from a center, and it lets Izuku murmur soft observations to Katsuki to keep them both focused.
Katsuki doesn't try anything as they make their way home. It's almost a relief, the door clicking shut behind them, and Izuku smiles warmly as he slips his shoes off.
"Welcome home, Katsuki-kun," he says. He reaches for the gag and carefully undoes it, pulling it free, watching the way Katsuki works his jaw.
"I fucking hate you," are the first words out of Katsuki's mouth. Izuku grins, tapping his finger to Katsuki's nose.
"I know," Izuku says cheerfully, "but that's okay. We'll work on it. I know you've had a hard life, Katsuki-kun, but things are going to be better now. You just need to be good for me, okay?" Izuku casts a glance down over Katsuki's body, watching the way Katsuki shifts unhappily. "Are your hands bothering you?"
"Fuck off."
"I'll take that to mean yes." Izuku tugs on the lead and brings Katsuki deeper into the apartment, past the living room and into the bedroom. He's already had the needed anchor points and secured leads installed, so it's easy to bring Katsuki over to the bed and attach the collar to the short lead secured to the wall.
"There are a few ground rules we need to go over, Katsuki-kun," Izuku says as he gently nudges Katsuki down onto the bed. Katsuki snarls, snapping his teeth, and only glares in response. "I don't want to restrain you and put you in danger because of your quirk, so I don't want to use the absorption gloves if possible." He puts one hand on Katsuki's knee, gazing intently at him. "Your quirk is dangerous and we both know it, so I won't pretend otherwise. How do you usually handle your quirk?"
"Why the fuck should I tell you anything, huh?" Katsuki spits, shifting away from Izuku's touch. Izuku moves with him, closing the gap so that he can grasp Katsuki's chin.
"I am your alpha now, Katsuki-kun," Izuku says softly. "It's my duty to keep you safe."
"Bullshit," Katsuki snaps back. "You fucking alphas are all shitheads, fuck you, I'm not your damn omega pet!"
Izuku clicks his tongue, grabbing Katsuki and flipping him over onto his stomach. Katsuki shouts, thrashing, but Izuku pins him easily, pressing him down into the mattress. One nip to the back of Katsuki's neck is all it takes for Katsuki's harsh shouts to dissolve into a warble of surprise, going limp and soft under Izuku.
"Yes you are, Katsuki-kun," Izuku murmurs in Katsuki's ear. "You're mine now. This is where you belong, as an omega- under me."
Katsuki trembles. Izuku feels for him, he really does- homeless for so many years and on suppressants to try and fight his nature, his omegan instincts have been all twisted up and poisoned into something ugly and desperate. Izuku's going to take those knots and gently, carefully untangle them until this beautiful man under him can finally be what he's meant to be.
"You're smart, Katsuki-kun," Izuku goes on, feeling the way that Katsuki's hips are shakily pressing up against him, instinctively rising to meet the cradle of his body. "You know you aren't getting out of this. We're bonded, now- legally, you belong to me. I'm not going to hurt you, I don't want to hurt you. I want to help you."
"No," Katsuki chokes, another tremor running through him. "I don't- want-"
"Shh." Izuku presses a gentle kiss to the shell of Katsuki's ear. "It's okay. It's okay. I've got you, Kacchan. You're safe."
Katsuki's breath catches. "...the fuck did you just call me?"
Izuku bites his lip sheepishly. "...oops."
Katsuki's chest heaves as he thrashes under Izuku, snarling again. "You- I can't- you've got to be fucking kidding me, you- fucking Deku?!"
"Yeah," Izuku admits, blushing. "It's- it's me, Kacchan."
"Get the fuck off me, you shitty nerd-!"
"No." Izuku presses Katsuki down into the bed with his weight, throwing all of his alpha voice behind the one word. Katsuki freezes, eyes wide and face pale. "I am your alpha, Kacchan," Izuku stresses, nipping at his skin again. His old childhood friend seems to barely be breathing, sweat breaking out across his forehead as his chest rises and falls rapidly. "All of that stuff when we were kids- it's in the past now, okay? It's okay. I didn't claim you for- for revenge or anything awful like that, I- Kacchan?"
"G-get off me-" Katsuki's voice is weak and warbling. Izuku leans in closer, pressing his nose to Katsuki's neck.
"I can't, Kacchan," Izuku says softly. "I need you to calm down and submit."
"I'm not going- I won't- not to you, you damn…" Thickness clogs Katsuki's words and Izuku croons softly, sympathetically.
"I know. I know. It's okay." Izuku presses a kiss to Katsuki's damp cheek. "I've always admired you, Kacchan. You being an omega didn't change that, not one bit. Everything is going to be okay, you just have to let me help you."
"...I can't."
"Yes, you can."
"N-no…"
Izuku lowers his head and fits his teeth over the healing bond mark, pressing in just enough to make Katsuki feel it. Katsuki lets out a surprised warble and goes completely limp into the bed, panting roughly.
"I've got you, Kacchan," Izuku soothes, nuzzling Katsuki's warm skin. "I'll help you, I promise. Everything is going to be okay."
"....f… fine, shitty… Deku…"
Izuku smiles, tilting Katsuki's face to capture his mouth in a gentle kiss. "Good boy," he whispers, feeling the way Katsuki shivers underneath him, his crimson eyes sliding shut as another tear slides down Katsuki's cheek. Katsuki is all his now and Izuku is going to do his damnedest to make sure that Katsuki is able to be a perfect fucking omega for him.