Chapter Text
Eijirou Kirishima couldn't believe his eyes. He stared through the thick, tempered, one way glass and swallowed thickly. In all his years on earth he'd never once in his life actually expected to be involved in something like this… something so…
Utterly crazy.
He couldn't believe it was happening, despite the fact it was what he'd spent most of his life working towards, hoping for.
“Doctor Kirishima? Are you okay? You've been staring at the creature for a while.” One of the base security guards, Iida, asked almost stiffly.
Eijirou turned quickly, tearing his eyes away from the sterile white room beyond the glass, tearing them away from its occupant. “Of course, Iida. I'm just…fascinated…” he trailed away as he looked back, as though his eyes had a mind of their own.
The creature, the alien, stood at almost seven feet tall, and it was prowling around on clawed feet. It's legs bent sort of like a rabbit’s, but there was no fur on them, only gloriously muscled flesh covered in...skin?
The alien’s skin was odd, fleshy and pale over it's chest and most of its face and legs, but it bled into vibrant orange and then into black at the elbows, along the creature's hairline and down the V framing clearly rock hard abs, disappearing into the strange sash of shimmering copper and black material around its waist. There were multiple criss-crossing thin belts around it's waist, and gold chains with what looked like orange precious gems dangling from them at intervals.
To dress like that, was that normal for the alien’s race, or was it special somehow?
Orange and black scales adorned the alien’s shoulders, ending in spikes like that of a lizard that protruded over. Likewise along it's spine were, well, spines. They started at the base of the neck and ran to the coccyx, black but tipped with orange, becoming slightly thicker and longer down the length of a powerful looking tail until they shrank again towards the tip.
The alien’s tail looked almost like an iguana’s tail, but the scales were black and orange like the rest of the thing, and it came from the tailbone above the start of the creature's sash and decorative belts. The bright and dark contrasting colours made the alien look poisonous, or at the very least, a creature that one should not fuck with, much like here on earth.
The alien had awoken about ten minutes ago and ripped it's way out of the thick leather restraints that held it to the gurney that was now destroyed and somehow smoking in the corner of the room.
Everyone collectively flinched back when the creature suddenly slammed a soot blackened and clawed hand against the glass and hissed. It's forked tongue poked between very human looking lips, and blond brows knitted in an angry scowl.
“Broa-d-cassst. Wh’y betray? VALK’NISSSID??” It drew back its other fist and slammed it into the glass and Eijirou shouted in surprise when it actually cracked. “I ssssmell yo-u, pretty. I remember.” It sounded threatening, terrifying, in that rough, raspy hiss.
Eijirou quickly grabbed for the microphone and clicked the button. “Sorry about strapping you down. But we don't know what you are or what you're capable of, we had to. You and your…friend? Are safe with us.” He tried to placate the beast before it broke out and ripped them to shreds. “Just, uhh, just hold on, we’ll move you somewhere better, okay?”
He released the button as the alien stopped and stared at what would be it's reflection on the other side, red eyes narrowing as it canted it's head. It stared so intensely it seemed almost like it could see through the glass, right into his eyes somehow. Eijirou wasn't even sure if the alien could properly understand him, but it had used broken English just now, so it was worth a shot. Even if he was about to knock the thing out.
Eijirou pressed another button and sleeping gas poured into the room from the vent in the corner.
“Ssssmell? Wh-” the alien's angry expression fell away as it's features softened and it slumped forward, and Eijirou was struck with the sudden and unsettling thought that it was...beautiful.
“As soon as it collapses properly, get it back on a gurney and take it to a reinforced living quarters without the viewing glass. Take a couple of blood samples, carefully. I'm going to see how doctor Yaoyorozu is doing with the other specimen.” Eijirou cast one more glance over his shoulder before walking hurriedly from the room.
“How is it going?” Eijirou asked as soon as the door to one of their other viewing rooms closed behind him a few minutes later.
“This one is…male…we think.” Dr Yaoyorozu said quietly, a light tint to her cheeks as she stared into the room beyond the viewing glass for a few more seconds and then scribbled down some rapid notes. Dr Midoriya stood beside her, muttering and scribbling rapidly, expression intent and focused. He barely looked up for a split second each time, before he was writing again.
The security guard, Tetsutetsu, stared unblinkingly through the glass, stood in the corner of the room with a telltale bulge at his crotch and an embarrassed flush staining his cheeks.
Eijirou looked quickly at their other captured alien and stopped short, eyebrows rising in surprise. The thing was on it's back on the gurney, that it must have torn it’s way out of like Eijirou's alien had. It had yellow and black scales and the same odd ombré skin as the other, but yellow in place of orange. This one was much smaller in stature, standing at about five and a half feet tall when they had measured while it was unconscious.
But more than that…this alien was currently masturbating furiously.
It -well, he?- had a clawed hand wrapped around his strange flaired and ribbed penis, working it like he wanted to pull it off. And he was moaning. Whining and chuffing and hissing until his back arched long moments later and pale whitish semen pumped from him to splatter all over his chest and stomach, running down onto the gurney in thin streaks as more burst forth and the alien bared its teeth.
He collapsed a moment later, spent. A shit eating grin spread across his face as he pulled his gold and black sash back into place. “Like the sssshow?” He teased, staring right at them, or rather, at his own reflection in the two way mirror, lifting his hand to suck and lick at his release. “Sssmell you allll. Not ssso sssneaky.” He said smugly, sticking a clawed thumb into his mouth and moaning quietly to himself for a moment, before flicking his attention back to them. “Where Katsssu’ki? Where isss he?”
“So, two male specimens, as far as we know. I wonder if gender and sex work the same for their species as it does for us? They're clearly sentient beings.” Doctor Midoriya murmured and looked immediately to Tetsutetsu, “can you- are you hard? Please Tetsutetsu, this is serious work. Go calm down, and then head over to the large observation area and request a form for the room. I'd like to put the pair of them in there together. They might be a mating pair for all we know…” he trailed off, muttering to himself again, attention already back on the thick notepad in his hands.
Tetsutetsu nodded rapidly as doctor Yaoyorozu pressed the button to fill the room with sleeping gas and knock their second alien out.
Eijirou told them he'd meet them in the cafeteria for lunch and opened the door to follow Tetsutetsu out.
“Dude. Seriously?” He whispered when the door closed behind them and they walked down the corridor.
“I didn't mean to! He was just- it was just really really hot, okay?” Tetsu countered defensively, crossing his arms over his chest and pouting. “I never expected an alien to look like… like that.”
Eijirou rolled his eyes, pointedly ignoring his best friend's still very obvious boner. “I recommended you for this job so we could work together and actually get to hang out sometimes instead of me living on the base and video calling you to get drunk, not for you to boner up right in front of my colleagues. Besides, you should see the other one. The one in there was nothing compared to my alien.” He added smugly after his admonishment.
They turned a corner and almost walked into a gurney being pushed by four people wearing masks and gloves. They still didn't know if these aliens were poisonous to them yet. The wheeled bed wasn't long enough to hold the orange alien -Katsuki?- and his clawed feet hung off the end by a fair bit.
Tetsu drew in a sharp breath beside him and Eijirou didn't even bother to fight a smug grin. “Amazing, isn't he?” He wanted to reach out a hand to touch those muscles, those scales, those lips…
Eijirou cut off that train of thought immediately, almost frowning at himself. He was a scientist, he had to be impartial.
Even if this Katsuki was the most beautiful creature he'd ever seen.
“Wow. He's… something alright. He looks like he could rip everyone on this base to sheds without breaking a sweat. That's some scary shit. Look at those claws.” Tetsu said beside him, before visibly shuddering, “no offence, but I'm glad I'm guarding the other guy.”
One of the porters chuckled. “I'm glad we only have to move them when they're out. I hope they're friendly aliens. I'd hate to get on the bad side of this one.”
Tetsutetsu laughed and agreed, fingers ghosting over the gun at his belt for barely a moment, before he clapped Eijirou on the shoulder. “Well br- doctor Kirishima, I'll leave you to your work. I'm gonna go use the facilities real quick and get that form for you. Work hard!”
He made his retreat quickly and Eijirou fought a roll of his eyes, because he knew his best bro was definitely going to jerk off while on the clock.
“I'll come with you to the new room. Let me grab my notebook and a couple of things first. Actually, what room number is it? You guys get him there and on the bed and I'll be five minutes.” He instructed, before turning on his heel and marching briskly away.
Eijirou grabbed his notes, a tape measure, swabs and a few other things, before quickly making his way to room 420. There was a porter waiting outside the thick metal door, looking like he had been given the most important task ever as he stood watch.
“Doctor Kirishima! I uhh. I was told to tell you that the alien will likely only be asleep for another half an hour, so please be quick. The door automatically locks when it shuts, but there's a buzzer next to it that you can tell security to let you out with. Should I get a guard too?” The man asked eagerly. He was still wearing his mask and a bright blue hair covering, so Eijirou didn't know what he looked like, but he nodded and smiled.
“Thank you. And if you can find either Inasa, Iida or Tetsutetsu, that would be great. I only really need one of them outside the door. Ka- the alien seems to understand English, so if he wakes up I can reassure him that everything is fine. But it's better to be safe than sorry.” He said warmly.
The man frowned like he thought it was a bad idea to want to even talk to an awake and probably angry alien, but Eijirou didn't care.
He walked into the room and set a timer on his phone for twenty five minutes. He'd be done in time anyway.
Eijirou worked meticulously, taking swabs from Katsuki's mouth, nose and ears, before checking his temperature and measuring the lengths of his limbs, head, and even claws. He plucked an ash blond hair from his head and put it in a sample bag, slipping all the samples into the pockets of his lab coat as he went, after correctly labelling them.
He paused for a moment to simply stare at oddly softened features as the alien breathed shallowly. Oh damn, he'd forgotten his stethoscope. Oh well, next time.
Eijirou drew in a slow breath as he trailed the pads of gloved fingers over scales that were even prettier up close and found himself blushing. That other alien’s penis had been ribbed and flared, yellow and black scales smattering over thighs and around the base.
Would Katsuki's be similar?
It went against his moral code to look. But he was a scientist first and foremost, and he had no doubt that Midoriya would be curious about it too, now that the other blond alien had showed his off.
Eijirou sighed and reached to lift the shimmering copper and black sash pooled between Katsuki's legs. He strangely didn't want anyone else to be the one to look at this alien’s genitals. He lifted the light, almost fluttering material in his fingers, drawing in a sharp breath a moment later.
Katsuki didn't have one penis. He had two.
Why two? The other alien only had one.
Curious, Eijirou reached out with his other hand to lift the top one and examine it. Both were obviously flaccid at the moment, but it seemed like the first penis was a little shorter than the other, and thinner too. The one laying heavily against the blond's thigh sat directly beneath the first, and was thicker and intimidating even while soft.
What would they look like hard?
There were bumps along the underside of the shaft of the second and it looked to have a more human-like bulbous head, though it was still slightly flared. He parted the slit a little to see a large urethra, definitely wider than a human’s, but not something that could be an ovipositor.
Eijirou felt his face flush a little as he laid Katsuki's second dick back down and moved the first back atop it. He didn't want to think about the way they’d feel inside him, but he couldn't shake the intrusive thought, and he knew he'd probably be imagining it later in his bed, like some kind of horrible pervert.
But he had been passive and non invasive in his examination, and he would never take advantage of anyone, alien or human. He'd only looked so that someone else wouldn't, he assured himself.
Eijirou was about to carefully replace Katsuki's clothing when a clawed hand shot to wrap around his throat and squeeze.
Holy fuck he was strong.
Why hadn't Eijirou's alarm gone off? He hadn't heard it at all. He almost kicked himself when he realised he'd had his phone on silent.
Katsuki growled something in a language that he didn't know, before switching to English. It had taken Eijirou years to learn it, it was impressive that the alien could speak it at all.
“What. Do. You. Thhhink yo’ur’re doing? What. Are. You, pretty?” His speech was broken and stopped and started, but his anger came across easily. The fingers at Eijirou's throat slackened to let him gasp in a breath, but still held him in place firmly as Katsuki sat up.
“H-hey. Uhh, it's not what it looks like, I swear. I was just examining you. Honest. I wasn't gonna do anything pervy, I'm not that kinda guy.” He flushed at the odd nickname he'd first heard the blond use last night as he defended himself.
“Guy?” Katsuki leaned closer, and holy crap he was tall even sitting down, Eijirou barely had to look down at all.
“Human. A m-man. Male. I'm a cis man. That just means- ah, probably not the best time to run off on a tangent huh?” Eijirou smiled weakly and tentatively wrapped a hand around Katsuki's wrist, tugging experimentally. The alien did not let go, he only bared his teeth and hissed. “Okay, cool, cool. I'm totally fine with this whole situation, but you can definitely trust me. I'm not here to hurt you, I promise.”
“Why look?” Katsuki demanded. He didn't look hurt or upset, just confused. He tilted his head to the side and frowned, and the expression had absolutely no right to look so cute on a nearly seven foot tall extra terrestrial that had him by the throat.
“I, um. I'm a doctor, a scientist. I wanted to see what your…stuff...looked like. I'm sorry.”
Katsuki raised a single brow and red slitted eyes roved over Eijirou's face, clearly calculating, before the blond slowly nodded like it was a fair enough reason.
And then Katsuki shifted forward a little, free hand reaching for Eijirou's belt. “I wan’t to sssee your cock too. Sssss only fair.”
“Uhhhh…okay? I mean, you're right, totally right. B-but that's not really how it works on earth. Okay, maybe it is a little? I just don't think it's really professional of me to-” Eijirou's face caught fire when his belt was swiftly undone and clawed fingers worked his button open hurriedly. The zip seemed to confuse Katsuki for a moment, but when he yanked at one side of the material, it opened with a grinding zipping sound that likely meant his trousers were ruined.
Eijirou held his breath, face hot as Katsuki plucked at the front of his boxers when his trousers slipped a little down his thighs. The alien frowned and growled, and it made his cock twitch, and shit, it really wasn't the time to get turned on right now, what was wrong with him?
Katsuki pursed his lips in a pout, before simply yanking Eijirou's boxers down.
As an honest to god alien stared at his dick, Eijirou wasn't sure whether to be scared, proud, or nervous when a deep purr started up. It rumbled from Katsuki's chest as a forked tongue flicked out to wet human looking lips.
Oh god, don't think about how that thing would feel around you, Eijirou half begged himself, but the image was already in his head, playing out as Katsuki cupped his dick and balls in a big hand, squeezing surprisingly gently, before wrapping clawed fingers around his length when it twitched and began to fill.
Eijirou tried to smother a surprised, breathy moan at the first, firm, pump. But Katsuki's attention was riveted to his face all of a sudden, head canting to the side with obvious curiosity as he slid his hand up and down Eijirou's cock slowly, purposefully.
“O-ooh shit. I- I'm sorry.” He gasped as his length hardened almost to the point of pain. He was embarrassed as hell, but he couldn't look away from red eyes as they watched for every little reaction, like Katsuki was actually the scientist here. He hoped to god the cameras weren't on in here yet or he was probably getting at least a warning for this.
“Why ssssorry? I like. Sstay.” Katsuki instructed firmly as he released Eijirou's neck and dropped his hand to his own crotch. He flipped the material covering his modesty aside and wrapped his big hand around both his engorged cocks with a hiss.
Eijirou stared. He couldn't help himself. He'd been right thinking that one was definitely bigger than the other. The bottom cock now had a slight swell at the base too, and they were both absolutely soaked with clear, slippery pre come.
“Oh wow…” he whispered, swallowing thickly as he heard a rough chuckle.
“You have only. One. Like Omma’sss do. Want to breed you.” Katsuki also rolled his r’s when he spoke, his strange accent thick.
“Breed? I can't breed with you. I don't even know if you're poisonous yet. Not that- I mean, not that if you weren't that I would. Cause I shouldn't. I'm just saying-” was he about to become an alien incubator? Shit. Eijirou realised he should really be making a run for the door, instead of slowly rocking his hips into Katsuki's fist to try and get him to move faster.
He didn't know what to do with his hands. Should he put them on his alien’s spiky shoulders? Touch his face? Bury them in thick ashen hair? Take over touching those unfairly amazing dicks?
Oh, now that option sounded good...
Eijirou clenched them both into fists when Katsuki suddenly sped up for a few pumps, before slowing right back down.
“Oh god- that's unfair.” He groaned before he could stop himself. He sounded desperate, far more desperate than he should be, given that he was still at freakin' work and he was supposed to be examining their specimen, not getting a hand job from it.
“Eyesss on me.” Katsuki commanded, assertive and firm as the hand on Eijirou's cock stopped moving all together, punching a whine from him.
Katsuki smirked when Eijirou's attention snapped immediately to his face, and he started working his cock again, clearly rewarding him. He leaned forward and hissed, forked tongue flicking briefly over Eijirou's cheek, before his mouth was at his ear, surprisingly hot breath washing over skin to make him shiver.
“Do you want my sssseed, human Omma? It’ss an honour to be chossen by royalty. I'm the ssstrongest aallpa too. Lucky man.” Katsuki practically purred, before licking the shell of Eijirou's ear, dipping his tongue inside.
“Shit, Katsuki- is, is your name Katsuki?” Eijirou moaned what he thought the alien’s name was, before realising he didn't actually know for sure.
“Yesss. Did that dun’fan Kaminari tell you?” Katsuki asked, licking down his neck as he worked them both a little faster. Eijirou could see his scaled bicep bunching as the arm working his two cocks picked up even more speed. “Prinsssse Katsuki Bakugou. You can kneel for me la-ter.”
It fell quiet after he agreed with a groan, only their panting breaths echoing until Katsuki suddenly moaned, biting down on Eijirou's shoulder. He pulled back quickly at the point where his sharper canines would have broken skin, and it was obvious that he'd just come with how soaked his bare thighs were when he sat back.
But Eijirou's eyes widened when the blond simply released his smaller cock and carried on working the thick, bumpy and ribbed larger one. He had only come from one and there was that much??
The thought had heat pooling low in Eijirou's belly and he finally knew what to do with his hands. He grabbed Katsuki's wrist with one and bit down on the gloved knuckles of the other as he began roughly moving the alien’s fist faster. He was gonna come, and soon.
Katsuki's eyes blew wide for a moment, before he released his cock and grabbed him, dragging him forward as he stood. Eijirou's back hit the large white mattress with a light thump, and suddenly Katsuki was on him, slitted eyes wild and expression eager. His tongue flicked out as he bent down, grinning, but a loud alarm sounded and the room began to flash with red light.
Shit.
Oh shit!
Eijirou fastened his trousers and shoved the alien off him as the door burst open and both Tetsutetsu and Inasa ran in, guns raised.
“WAIT! Wait a second! He wasn't trying to hurt me!!” He rushed out, getting in their line of fire quickly as Katsuki snarled behind him. He felt hot breath on the top of his head as the alien stood and loomed over him, growling.
Tetsu and Inasa’s eyes blew wide, and they stared at the point above Eijirou's head, dumbstruck.
“How dare you int’er’upt my mating. Leave.” Katsuki demanded, a hand sliding around Eijirou's waist to lift him from the floor by half a foot. A nose pushed against the top of his head and his alien drew in a long breath as a still very hard cock rubbed against him.
Holy fuck.
“Uhh, Katsuki? I think you're gonna have to let me go. So we know we can trust you, yeah?” He didn't particularly want to leave, but he wasn't letting the blond start a fight only to end up shot full of holes and dead. He wanted another opportunity to touch him, to be touched by him.
Katsuki grumbled for a long moment before he set him down. “Keeping usss locked up and watching usss isn't trusst. Sssilly man.” He growled and Eijirou grimaced as he stepped away.
“I know. I'm sorry. It's just how things are done on earth. Humans are weak and fearful, and we have to be sure you're not here to harm or invade us. It's...not ideal. But know that I won't hurt you.” He assured as he turned to back out of the room slowly.
Katsuki watched him with a scowl on his face and a clear tent in his long loincloth. “Don't like. Ssstay with me. You can do that, yesss?” The blond's gaze didn't even flick to T or Inasa. He obviously didn't acknowledge them as a threat at all, he was solely focused on Eijirou.
“I can't, Katsuki. Am I allowed to call you Katsuki? Or do you prefer Bakugou?” Eijirou elbowed Tetsu and jerked his head back, telling him to leave. He did the same to Inasa a moment later when Katsuki told him only he was allowed to use his first name.
Eijirou smiled, backing up as Katsuki's scowl deepened. “Thank you. My name is Eijirou Kirishima, you can call me Eijirou, that's my first name too.” He closed the door slowly as his alien bared his teeth angrily, not wanting him to leave. “Don't worry, I'll come back. You'll see me again soon. I promise.” The door closed with a snap and a heavy click sounded as a thick deadbolt locked it and the alarm stopped.
Eijirou heard a frustrated roar followed by a bang on thick iron and shouted a genuine apology, before walking away.
He ignored both Inasa and his best friend's concern as he turned on his heel and headed straight for the toilets. It looked like Tetsu wasn't going to be the only one jerking off while on the clock today after all.