Chapter Text
Natsuo has come to expect a certain level of craziness whenever he walks into Sukunahikona Clinic. His kids The St. Sebastian’s boys come every day for cram school in the back room, the Virtues pop in with their usual flair and smatterings of injuries, as well as the occasional independent vigilante searching out Natsuo’s badge. He’s even grown used to the UA staff and students popping in for quick fixes.
With the approaching spring, Keigo came in for his contraceptive patch prescription. Fumikage had looked so embarrassed when he mumbled, “I, too, would like the aid of a contraceptive.” Natsuo had chosen not to think about the fact that his youngest brother was sexually active, or at the very least about to become very active. Natsuo has been keeping a close eye on Stolas’s mood swings. Stolas has taken to hand feeding him more often than not, and when Natsuo doesn't complain his wings mantle with pride that he’s pleased his mate. He has been preening his wings and tail almost obsessively. They’ve both gotten fuller, Stolas’s preening oil has darkened, leaving them with a dark shiny hue that makes them so soft, Natsuo just can’t help burying his fingers deep in his feathers. The hairline fractures in his antlers have started to crack and fissure, revealing veins of opals that flash and shine beautifully.
So despite his regular visitors he’s a little surprised to find Bakugo Katsuki waiting in an exam room. The angry furrow of his eyebrows offset by his curled shoulders and hands tightly clenched in his lap as he sits on the crinkly white paper on the exam table, looking disconcertingly resigned.
“Bakugo, you don’t come to see me often.” Natsuo comments, pulling the door closed behind him. He learned the first time the spunky teen came in how he detests small talk.
“Yeah well- I’m just here because Deku said you were nice to Fu and Himiko or whatever.” he mutters, and it’s with surprise that Natsuo watches the hair on the back of Bakugo’s head bristle.
Oh, I see.
“And what exactly brings you here to see me?” Natsuo asks kindly, taking a seat on the short rolling stool, forcing Bakugo to look at him despite his down turned face.
“Have you ever met anyone else like me?” He shifts his eyes away, blond brows drawing down. He disentangles his hands and pushes one roughly through his hair. Natsuo waits patiently, it’s obvious this is a difficult subject for the hero student. “f*ck. You know… someone with animal instincts but no physical mutations?”
“A few, actually. There are three living at St. Sebastian’s right now, and there's one in my class in medical school. It’s not as uncommon as you think.” Natsuo says, keeping his voice low and calm for the uncomfortable sixteen year old.
“My alp- friend,” he corrects, his ears turning red “My friend Toshi said I should get a referral for instinct counseling.” Bakugo’s bright red ears twitch and his shoulders hunch up.
“I can help you with that.” Natsuo assures, going to a filing cabinet in the corner of the room and pulling out a handful of brochures. “I know this was a hard conversation for you, Bakugo. I want to thank you for trusting me, and I want you to know that these genetic components to your quirk factor are not as uncommon as you probably think.” Natsuo telegraphs his movements as he slowly reaches for the blond. He stays still, but spooks a little when Natsuo’s hand lands on his hair. He stiffens for only a moment before relaxing into the soft cool touch. Natsuo tries not to make a sound of surprise at how thick Bakugo’s hair is, a little surprised by the coarse texture of the fluffy blond locks. Natsuo pulls his hand back and stands to start making a note in the teens chart. Bakugo’s nostrils flare and his eyes narrow in thought.
“Doc, are you f*cking ok?” He asks, nose twitching a little. “You smell different… sort of like-” me he pauses eyebrows furrowed in thought. “You didn’t smell like this last time.” He mutters embarrassed. Natsuo flips back through his chart to his last appointment, February 10th, just before the puppy quirk.
“I had a quirk accident a few months ago, it's probably because of that.” Natsuo explains, flashing him a smile. “Come see me again if you need help, ok?”
Bakugo nods reluctantly, holding tight to his pamphlets.
Natsuo is so close to the end of his shift, so, so close, when a drunk asshole comes in to get his stomach pumped. He’s not a new patient for Natsuo and unfortunately, he’s one of his least favorites. He’s needlessly flirtatious, even after Natsuo has explained the ethical issue of flirting with and dating a patient, as well the fact that he is in a very loving and committed relationship. Maybe that’s why he came stumbling in, to try his hand again at getting what he wants even if his partner is unwilling, because when Natsuo comes to help move him to an open room the patient grabs Natsuo’s wrist in a surprisingly tight grip, his hand burning hot. Natsuo yelps in surprise, whipping his arm away to see a bright red hand print around his wrist. It starts to fade before his and his wide-eyed nurse's eyes.
“Go get Dr. Chikao, the patient just used his quirk on me.” Natsuo says calmly, grabbing the patient's chart as they slur, “Come on sweetheart, we can have a little fun, nothing to worry about.” Disgust sits high in Natsuo’s throat as he steps into the hall flipping through their chart as fast as he can. His heart stops when he finds his quirk registry page.
Quirk: Rose Tinted Glass, an aphrodisiac quirk requiring conscious activation and five point touch, classified as a first degree, level III, type A sexual induction. Natsuo’s heart drops, mind whirling with information.
Break down the question, Natsuo. A first degree, level III, type A aphrodisiac quirk. 1) first degree: physician’s recommend the affected party ride out the effects with a trusted partner. 2) level III is considered severe effects on the affected party. 3) Type A: its deactivation is limited by the amount of sexual release the affected party can achieve. Natsuo blows out a harsh breath closing his eyes for a moment, standing frozen in the hall, clutching the chart in his sweaty palms. In for 8, out for 5. He cycles his breathing before opening his eyes again.
Side effects include: elevated heart rate, fever, shortness of breath, increased lubrication production if applicable, lowered inhibitions, decreased refractory period, increased sexual fervor, changes in vision and eye appearance not attributed to hallucinations, increased aggression or potentially feral outbursts by those with heteromorphic traits...
Sweat has already started to bead on his forehead, cheeks flushing a soft pink when Dr. Chikao comes running toward him.
“Todoroki, Nurse Ito told me what happened, are you alright?” He asks urgently, eyes wide with concern as he looks over his medical student.
“No, I’ve been targeted by an aphrodisiac quirk.” Natsuo forces himself to remain calm, to remember the protocols he was trained in. The edges of his vision are starting to look strange. He blinks rapidly as a bead of sweat trickles down his spine in a slow drip. “First degree, Class III, Type A. Side effects are already setting in, I don’t know how much time I have-” He squeezes his eyes shut as a wave of heat spirals out from his core. It’s like someone doused him in lighter fluid and dropped a match beside him. His quirk flares automatically to try and control his temperature.
A firm hand grips his shoulder leading him blindly into an empty exam room. “I’ll call Mr. Yew. You did a good job, just rest.” Natsuo opens his eyes as Dr. Chikao helps him onto the table and everything is tinted a soft pink, the cracks and scuffs on the walls muted, nearly invisible. If I didn’t know they were there… I wouldn’t even see them, Natsuo realizes distantly.
“Don’t let anyone else inside.” His voice is strained, pitched higher, pulling at the older doctors heartstrings as he gazes down at his flushed, panting protege.
“Of course Todoroki, the only person who will come in here is Mr. Yew.” Natsuo nods as he looks away from the doctor who looks much softer around the edges, who looks like what Nat would imagine he would look like if he wasn't so weathered and hardened by the things he's seen in the underserved clinic. As his quirk starts to fail, his temperature rises. Distantly he hears the door close as he starts to shiver. You can do this, Stolas will be here soon. He stares at the ceiling watching dust motes dance in the light.
Stolas answers his phone as soon as he sees Sukunahikona Clinic flash across his screen, a pit forming in his stomach as he lands on top of the ledge of a building.
“Go for Yew Stolas.” Stolas says cheerfully, wiping the blood from his mouth. His instincts have been far more volatile as his season approaches, soon he won't be able to leave the safety of their den, he's trying to devour as many foul, sinful souls as he can before then.
“Mr. Yew, this is Dr. Chikao. You need to get to the clinic as fast as you can. Natsuo has been the victim of a quirk accident.”
“Holy sh*t, what happened?” Stolas caws, his heart jack rabbiting in her chest as he launches into a steep dive, disappearing through the shadow of the building and reappearing fifty miles north.
“He was attempting to administer treatment to an inebriated patient when they grabbed him and activated their quirk. I need to warn you Mr. Yew,” Dr. Chikao’s voice drops in his ear as he makes another jump closer to his mate, wings straining with each silent beat, the muscles in his back pulling as he pushes himself.
“The quirk was sexual in nature, an aphrodisiac quirk that’s been rated as severe and has been recommended that a partner see victims through the effects.”
“How long is it supposed to last?” He asks breathlessly as he shoots straight through one shadow and into the next.
“The information we have states that the deactivation requirement is based on the amount of release the patient experiences. Unfortunately the patient is not in a position in which they can give further detail at this time.”
Rage starts to bubble in his stomach, his secondary wings bursting from his back in a spray of blood, the skin instantly closing around the joints. The extra power on the next beat has him shooting forward at a speed that could maybe get him close to Archangel’s.
“It was that bastard wasn’t it, the one who couldn’t take a hint.” Stolas can see it above him, in the twinkling stars, in the stories they tell. As quickly as he sees it, it disappears in the next instant as he flies into the shadow of a business building.
“I have called the police already, they’ll likely wish to speak with you regarding the incident, and whether or not Todoroki will wish to press charges.”
“Hell f*cking yes we’ll be pressing charges! My mate is a protected citizen! Any intentional harm that comes with him is a federal Goddamn offense! That bastard has been making passes at Natsuo for weeks! I want him charged with attempted sexual assault!”
“Mr. Yew,” Dr. Chikao cuts him off, voice low, a warning. “I understand you are upset, you may not believe me, but I am too. Mr. Todoroki is my responsibility and I failed to protect him from something that should have been preventable. Right now, Todoroki needs you to be calm when you arrive. He is in an acute level of distress and I will not release him into your care if you are not calm, do you understand, Mr. Yew?” Stolas takes a deep breath before pushing through the last shadow and appearing in the alley beside the clinic. He bursts through the doors, four wings extended and eyes a glowing red. He hangs up as Dr. Chikao turns to look at him, putting the phone down in the cradle. He lifts a dark blue eyebrow, pushing his horn rimmed glasses up his nose.
Stolas shoves his phone in his pocket and takes two deep breaths. His second set of wings disappear, when his eyes open the red is gone.
“Where is he?” Stolas asks, talons ripping at the velcro wrist secures on his gloves so he can pull them off and shove them in his back pocket, he unfastens his chest harness with it’s knife holster. The snowflake pin glints on the opposite side. He drops it straight into his shadow, letting it disappear.
Dr. Chikao looks him over critically. He must find whatever he's looking for because he nods and turns on his heel.
“Follow me.” He leads him down the hall, explaining the symptoms to expect, but he’s only half listening, mate is hurt, mate in danger. They stop at the last exam room, the door closed firmly. Stolas can smell him from the hallway, overpowering, overwhelming lust. The sweet syrupy scent is thick with fresh, wet earth, and pine needles. Stolas takes a deep breath, eyelashes fluttering as his instincts rear up. Spring, it’s spring, mate is fertile, mate, my mate- a soft canine whimper clears the haze of his instincts, as he reigns himself in.
“Take care of him, if you need anything, here’s my number.” Dr. Chikao hands him his card. “I’m assuming you’ll see yourself out?”
Stolas nods. He waits until the doctor is down the hall before slipping into the room. Natsuo is flushed, hair slick with sweat. Soft, whimpers spilling past his lips as he humps the table beneath him, his hand shoved down the back of his scrubs. A sizable wet spot staining his ass.
“Oh, precious,” Stolas breathes, striding toward him. Natsuo’s eyes fly open and that’s when he sees his glacial gray eyes ringed in pink, his pupils little pulsing hearts.
“S-Stolas.” Natsuo gasps, he nearly falls off the bed when he tries to crawl toward his mate. Stolas dives forward, catching him. “H-hurts, Stolas. I’m so empty, it hurts.” He pants, arms curling around his neck, his leg hiking up over his hip, he grinds his hard length against him, eyes rolling as he moans wildly, mouth going to his neck, pressing wet kisses against him.
“It’s going to be ok baby, I promise, we just have to get you home.” Stolas reassures, his grip on his instincts tenuous as Natsuo grinds against him.
“F-f*ck, feels good Daddy.” he moans as he c*ms in his pants. The rush of pleasure feels like it only lasts for an instant though before the fire is back, hotter than before, a knife stabbing into his belly. Big fat tears start to roll down his cheeks, his temperature too hot for them to freeze against his cheeks.
“Shh I know baby, I know. It’s gonna be ok, I promise. You’re going to go in my pocket for a little while and then you’ll feel better, I promise.”
“Promise?” Natsuo slurs, eyes wide and trusting, the hearts in his eyes growing like dilating pupils almost obscuring the gray. Stolas sees it, just for a moment, a shimmer in the air around his mate's flushed face, can almost taste the lingering divinity in the air.
“I promise.” His words echo in his ears.
Natsuo sniffles, “Ok Daddy, I’ll be good.” he whines burying his face in Stolas's neck, teeth sinking into his shoulder as he sucks and nibbles at the skin he can reach.
Stolas sucks in a deep breath, his co*ck painfully hard at the smell of his mates yearning.
He wraps them in his wings and lets his mate slip out of his arms. He gives himself one breath to collect himself before he steps through the darkest shadow in the corner of the room.
The dark is soothing around him as he floats, but it isn’t enough, he’s so hot, and his skin prickles and hurts everywhere his scrubs rub against him. It feels like it's rubbing him raw, too rough, too scratchy, too stiff. He scrabbles at the texture, pulling and wiggling and getting himself all tangled up, but he manages to pull his sweaty shirt off and shove his disgusting pants and boxers down, hardly paying attention to his shoes or socks that he kicks off.
When Stolas releases him he’s spread on the softest blanket they own. Natsuo sighs, rubbing his sweaty cheek against it, eyes fluttering open to find Stolas kneeling before him like a sinner at his altar.
“You're so beautiful,” Natsuo mumbles in awe, back arching and legs falling akimbo. “Opals,” he giggles deliriously. “M the queen of opals, the queen of Yew Stolas.” His eyes are trained on the fissures in his antlers, in his crown of thorns, sparkling white, pink, lavender and blue. Stolas looks softer, bathed in rose gold lamp light forming a lovely halo around him. Big, warm hands wrap around his waist, pulling him up his thighs where he kneels between his legs. Something slick won’t stop leaking out of his ass, but Natsuo is easily distracted when knuckles brush his cheek, sending tingles rippling down his neck, the knife in his stomach twisting painfully. He leans into the palm Stolas presses to his cheek.
“I’ve got you, snow angel. I’m gonna make it better.” Stolas promises, his brown eyes are wide with his warring emotions, worry and hunger and fear and lust. It’s a heady mix that has Natsuo desperate.
“f*ck me Daddy, need you, I was good Daddy, always good for you, I’ll make you feel good,” he promises.
His eyes roll when the pain finally eases as Stolas lifts him enough and slides inside him, punching the air from his lungs. Sparkles dance across his vision at the sudden relief at being stretched around his mate, at finally being full. Stolas wants to tip his head back, to close his eyes at the wet slide, but he can’t, not when Natsuo’s eyes are wide open trained on him as he drools and mewls. The hearts in his eyes start to pulse when he starts to roll his hips. Every thrust fills the air with the lewd wet slide and slap of skin, Natsuo’s face is euphoric as he stares up at his mate like he can see the universe inside of Stolas. The pink ring surrounding the gray that Stolas loves so much starts to glow brightly when Natsuo c*ms, whining and panting, hands scrambling to hold onto Stolas, to keep him from pulling out. The demon guides one of his legs up over his shoulder, and the other to wrap around his waist before he grabs Natsuo's scrabbling hand to press into the bed beside his head as he leans over him, wings shivering and mantling to shield them, casting beautiful, dazzling shadows over them.
“That’s it’s precious, just like that, doing so good for me.” He praises, pressing a kiss to his parted lips. Natsuo is uncoordinated as he kisses him, his free hand sliding up Stolas's shoulder, to the back of his neck and into his hair, curling in the softness of it.
Stolas loses track of how many times Natsuo c*ms, showering him in praise each time for how well he can take his co*ck, how beautiful he looks when he feels good, it's remarkably easy to get him off in the state of euphoria the quirk has induced. He passes out from exhaustion sometime a few hours later and Stolas falls down beside him gratefully, hopeful that when he wakes up his mate will be back to normal.
His rest is only a short reprieve, because he wakes up to find Natsuo bouncing himself on his co*ck, panting like a puppy, and for an instant Stolas is mournful that he isn’t wearing his soft white ears because what a pretty picture he makes.
“Daddy, want your knot.” Natsuo gasps as he grinds down on his co*ck, and Stolas is convinced he can see a little bulge where he’s buried in his lower belly. Stolas’s fragile control over his instincts snaps like a toothpick. Spring, it’s spring, take care of mate, fill mate, breed mate.
“You want to be bred?” Stolas coos, hands skimming up his smooth thighs to his ass, spreading his cheeks a little wider as he f*cks up into him, dark shadows curling around the base of his dick to press against his rim with each thrust.
“Yes! Yes please, please breed me Daddy!” Natsuo sobs as he grinds into each rough thrust until he’s filling him up, shadowy knot expanding until he’s wailing, eyes glowing a pretty kaleidoscope of pink and hearts shivering as they grow and shrink, dick jumping and twitching, he always c*ms so much when he's knotted. He slumps in his arms, practically purring, just a puddle pressing soft, drooly kisses to his heart and mumbling how much he loves his mate.
Stolas’s instincts are basking in the attention, he hoots and chirps softly as he preens Natsuo’s messy hair. He coaxes his mate into drinking from a bottle of water sitting beside their nest, chirping encouragingly as his wings curl around them before he slowly starts to grind against his mate, eyes trained on his little belly bulge intently.
It takes two days. Two days before the pink around his eyes finally disappears between one blink and the next, and Natsuo passes out beneath him. Stolas claws his way through the haze of his spring fever. He manages to find his phone laying just outside the nest and send a quick text to Touya: 119. Need help. He closes his eyes, exhausted, before his phone buzzes.
Here.
He presses a kiss to Natsuo’s temple, the flush that covered his fair skin has finally started to go down. His instincts scream obscenely as he drags himself from his nest, from his mate. Protect! Don’t leave mate alone! Not safe! Protect protect protect!
He pulls his robe around his nakedness, leaning on the wall as he walks, feeling weak after two days spent sin drunk, but at the same time sluggishly, gluttonously full, like he’s eaten too much and can barely move.
He growls at the door, fighting against himself even as he pulls it open and there stands one of his closest friends. Touya takes half a step back when he sees the state Stolas is in. There are deep circles under his eyes and his wings are an absolute mess from their romping in the nest, but lack of lucidity to preen. The wide fissures around the base of his antlers have spread and opened all along the ebony bones, revealing more gemstone than bone in some places. Touya’s mouth goes dry, he recalls from last spring what that means.
“Nat got hit by an aphrodisiac quirk, it just deactivated.” Stolas explains slumping against the door jamb. “He triggered my spring cycle early.” Stolas’s pupils shiver, shadows writhing beneath his feet. He recognizes the arsonist as a part of his strange little mortal family.
“What do you need?” Touya asks, electric blue eyes studying him worriedly.
“Supplies. We aren’t- we aren’t ready. We were supposed to have a few more weeks-” Stolas mumbles, shoulders slumping as a deep feeling of failure makes his messy wings droop. Bad mate. His instincts accuse. Can’t provide. They hiss poisonously.
“I’ll take care of it. Raw meat, protein bars and smoothies? Is there anything specific you need?” Touya asks urgently, can see how the owl is starting to slip as his wings shiver and his pupils expand, focus slipping as his eyes wander over his shoulder to glance back down the hall to where his nest awaits.
When Dabi steps closer trying to draw his attention he presses his cheek to his, pressing his scent into his damaged skin, marking him as his, his family, his to protect. With slow movements Dabi grabs his chin, forcing him to look at him. If it had been anyone else, he knows they would probably lose their fingers to the sharp canines he can just barely see.
“I have your spare key.” Dabi reminds him slowly. “I’ll bring everything inside and put it away. I won’t come near the nest. Is that going to be ok?” He asks slowly, forcing himself to hold eye contact even as Stolas's nature tries to rise up at the challenge, dominance oozing out of his pores. Dabi drops his eyes to stare at his chin respectfully. Stolas’s wings spasm, eyes darting down the hall to his nest, to his vulnerable mate.
“Okay.” he whispers, and Dabi is quick to drop his hand away from him and step back.
Natsuo wakes up so incredibly sore, floating in their massive bathtub against Stolas’s chest. The princely demon has a cold rag wrapped around the base of each antler. They ache terribly, and the fracturing of the bone has a migraine pulsing behind his eyes. Natsuo blinks slowly, categorizing how he feels. His back and his ass are sore, and he’s starving, but otherwise he’s no worse for wear. He thinks back on the last couple days and is relieved to find his memories intact. He smiles dreamily, rolling to press his face into Stolas’s neck, nuzzling close.
Stolas hoots lowly in his ear pressing a kiss to his forehead.
“I love you, thank you for taking care of me.” Natsuo whispers, pressing kisses wherever he can reach.
“Love too.” Stolas manages between chirps.
The owl helps him out of the bath on shaky legs before following. Nat towels off before helping Stolas into his robe and sitting him down on the bench along the wall and carefully blow drying his feathers. He watches the owls head dip and jerk back up as he dozes until he’s all but slumped against the wall, breathing deeply as warm air dries his soft feathers. When he’s done Natsuo helps him back to their messy nest and spends an hour realigning his feathers and coating them in oil. Stolas is snoring soundly by the time he’s done. With the utmost care, Natsuo gives his tail feathers the same treatment. He knows how sensitive they are, but Stolas doesn’t even stir, a testament to his exhaustion.
Nat hears the front door close and goes to investigate, only to find a fresh pack of bottled water on the counter and a plate full of sandwiches covered in plastic wrap waiting for him. He grabs a set of waters and the plate, taking it back to the nest. He eats two and sets the rest aside for when Stolas is awake and downs one water before worming his way under Stolas’s arm to curl against his chest and sleep.
