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Mirio calls Tamaki a calm person.
Even when his anxiety flares up, Tamaki gives off calm energy, not running around the way Mirio, Nejire, and now Kirishima like to. He keeps his energy under wraps, for the most part, channeling it into training and trying his best to be the voice of reason when he can. Which isn't often, especially when his three friends are all in the same room together, Tamaki often found himself wrapped up in something crazy.
Sometimes, though, his emotions get a little too bottled up, his energy lacking an outlet, and Tamaki becomes a little… feral. He hated the feeling, like electricity under his skin, searching for a way out.
Tamaki found himself buzzing after a particularly nasty takedown. He had just been on a patrol with Kirishima, a quiet area of town not long before rush hour traffic would hit. What started as a simple robbery from a storefront quickly developed into an all hands on deck situation, and Tamaki was the first to arrive.
Kirishima was a huge help in getting the villain captured and subdued, saving Tamaki more than once from hits that could have done some serious damage. The redhead came out unscathed, smiling at the medics who checked him over while another gingerly bandaged Tamaki’s cheek. He twitched when gentle fingers touched his skin, his body a live wire as he apologized.
Maybe it was the adrenaline, maybe it was just him, but Tamaki needed to move and soon. He brushed off the medics with apologies, letting them know he’d be fine, he knew to watch himself and Kirishima for any changes, the works. A halfhearted excuse about paperwork got the medics off his back and Kirishima made his way over, sensing Tamaki’s growing discomfort.
“Hey man! Nice hit right there at the end, those tentacles were badass!” Kirishima’s hundred-watt smile never failed to make Tamaki blush a little, trying to keep his hands from shaking.
“You okay, Senpai? You look a little wigged out, did the villain get to you?” Tamaki shook his head quickly, looking up and meeting Kirishima’s eyes. The underclassman was clearly worried about him, looking him over for any missed injuries, any signs of being quirked.
“Just, a-ah, just a bit worked up, the adrenaline and everything, yeah?” Kirishima nodded, rocking on his heels.
“Like when you get out of the battle, everything's fine, but you can't shake that energy? Like another villain could pop up and you swear you could punch them across town even without your quirk.” Tamaki chuckled, pushing his bangs back. The sound seemed to make Kirishima relax a bit, his shoulders dropping.
“And nothing seems to help.” He muttered, fidgeting with his fingers. Tamaki knew of two ways to fix this feeling, either train until he passed out, or fuck someone until they did. One was easier than the other, especially with Mirio out of town for the next week. Tamaki didn't have a week, didn't think he had an hour before he was consumed by his own energy. Kirishima looked down at him, his eyes soft and kind.
“Senpai?” He asked, the nickname making Tamaki’s cock twitch in his pants. Despite the age difference, Kirishima was taller than Tamaki, his body solid and strong. He could take Tamaki, and he would look amazing doing it. Tamaki chewed his lip, debating on if he could even ask Kirishima for something like this.
The pop of cameras made Tamaki’s head snap up, quickly pulling on his hood to shield himself from the photographers and camera crews as they gathered. Kirishima grabbed his hand, wordlessly pulling Tamaki away until they were both sprinting. They ducked into an alleyway and Kirishima panted, his body not built for speed.
“Sorry, fuck, I know you hate cameras man, I didn't want you to have to deal with that when you aren't feeling so hot.” Kirishima groaned, rubbing his calf. Sweat glimmered on Kirishima’s broad chest, calling attention to the dips and valleys of muscle. Without thinking, Tamaki surged forward, backing Kirishima up against a brick wall.
“W-whoa…” Kirishima whispered, unsure of how to react. Was this a quirk? Was Tamaki somehow pissed at him? The look on the other man's face was unclear and Kirishima swallowed thickly, the silence weighing on him.
“Do… do you want to help me?” Tamaki asked, trying to contain his growing desire. He wouldn't force Kirishima into something he didn't want, but every cell in Tamaki’s body begged the powers that be for him to say yes.
“Of course I do! What do you need, Senpai, I'll make sure you get it! You worked so hard, I want to help you feel a little better if I can.” The innocence on Kirishima’s face was almost too much for Tamaki, he clearly didn't realize what he was saying.
“Are you sure about that? Anything I need?” Kirishima nodded eagerly and Tamaki’s head spun, his blood rushing to his cock.
“On your knees, then,” Tamaki ordered, feeling another, darker side of himself take over. He only got this demanding in bed, Mirio called it his ‘dom voice’, even if the insinuation made Tamaki’s cheeks flame. After hesitating a moment, Kirishima slid down to his knees, never breaking eye contact with Tamaki. His tongue, a soft pink, poked out to lick his lips unconsciously, and Tamaki knew he wasn't going to be able to hold back.
“W-will this help?” Kirishima asked, realizing that he was eye level with Tamaki’s crotch. Maybe he was reading it wrong, but there was only one reason Tamaki would want him here, and his mouth watered at the thought.
“It's the only thing that will,” Tamaki replied, one hand against the brick as he leaned over Kirishima.
“Then I can take it! Do your worst, Senpai, if it'll help you.” A filthy thought crossed Tamaki’s mind, his cock aching at the idea. If Kirishima was so eager to help, he probably wouldn't be opposed to Tamaki making things a little interesting. Using his quirk in bed always helped him burn off some extra energy, and the way Kirishima was staring only spurred Tamaki on further. Kirishima watched with wide eyes as the growing tent in Tamaki’s pants morphed, much larger than before.
“I… is this your quirk?” He asked, reaching up a hand before pulling it back. Tamaki nodded, trembling fingers undoing his pants and shoving them down. Kirishima gasped at the sight of what would have been Tamaki’s cock. The new appendage pulsed, shining with its own natural slick.
“What in the fuck is that, Senpai,” Kirishima swore, rising up on his knees to get a better look.
“Think you can still do it?” Tamaki asked, brushing off the question. Kirishima didn't need to know what he had made just yet, he’d learn soon enough.
“Not… n-not all of it, there's no way,” Kirishima’s words trailed off into a moan. He had never seen a cock like this, he knew it couldn't be human, given Tamaki’s quirk. It was long, slimmer at the tip than the base. The head was almost pointed, flat on one side with a long slit. Something Kirishima couldn't identify leaked from it, dribbling down the length.
“We’ll see, you’re so good, I bet you can do it.” Tamaki purred, trying to keep himself in check. This wasn't Mirio, whose limits he knew. Kirishima looked like he could be a virgin, he couldn't shove the entire thing down his throat just yet. The redhead didn't seem to know where to start, opening his mouth before pausing, moving around like he was trying to find a different angle.
“Want help?” Tamaki offered, his hand easing into Kirishima’s hair. Slim fingers wound their way into gelled locks, getting a solid grip but not pulling. Kirishima nodded, letting his eyes close as Tamaki guided his mouth onto the tip of his length. He stuck his tongue out and Tamaki bit back a chuckle, Kirishima had clearly only ever seen other people doing this.
Still, he was a quick learner in Tamaki’s experience and sure enough, Kirishima’s lips closed around the tip of his cock and he sucked. The flavor was unusual to Kirishima, salty but not unpleasant. He suckled on the first inch, his tongue playing with the slit like he’d seen done in videos.
It felt odd, having something in his mouth, so warm and heavy, but Kirishima found he liked it. He slid forward on his own, taking a couple more inches before looking up at Tamaki. Kirishima watched the other man's face as he bobbed his head a few times, getting the hang of it. He popped off Tamaki’s cock, panting with a string of saliva connecting his lips to the tip.
“Am I doing it right?” Kirishima asked, adjusting his position. He was starting to get hard, ever thankful for his loose pants.
“You’re doing great, keep going.” Tamaki groaned, letting a sinful moan drop echo off the brick. His ovipositor was always more sensitive than his cock, pulsing and searching for the right spot to deposit its load. Kirishima picked up the pace, bobbing his head to take more of Tamaki’s cock. His own length ached in his pants, jumping when Kirishima started to slowly palm himself.
He pushed himself to take more, his lips stretching painfully wide but still a few inches short of the base. Kirishima gagged when he pushed himself too far, the sensation of Tamaki’s cock slamming the back of his throat catching him off guard. He pulled off and coughed, catching his breath when Tamaki yanked his hair.
“S-sorry, gimme a sec man, you’re huge!” The praise did little to quell Tamaki’s growing sense of power over Kirishima, his heartbeat thrumming like a birds. He pulled Kirishima forward by the hair, the little yelp of pain only serving to turn him on.
“You can take more, Eijirou, I know you can.” To Kirishima, it sounded more like a threat than a compliment, groaning when Tamaki shoved half of his cock past Kirishima’s lips in one go. Being face fucked was so much hotter than just sucking Tamaki off, Kirishima realized, his hands scrabbling for purchase on Tamaki’s thighs. It didn't slow him down, the other using Kirishima like a toy. As he pushed more of his cock into Kirishima’s mouth, the redhead gagged, trying to pull away on instinct.
“Just take it, you can do it, there you go,” Tamaki swore under his breath as tears sprung to Kirishima’s wide eyes. He felt Kirishima’s throat spasming around his cock as he shoved the entire thing inside, moaning at the wet heat that squeezed his length. The ovipositor pulsed, leaking fluid down Kirishima’s throat.
“Swallow,” Tamaki commanded, Kirishima offered no choice but to listen. Tamaki moaned loudly as Kirishima swallowed around his cock, his tears running freely down his cheeks. Tamaki finally pulled back, letting the ovipositor fall from Kirishima’s lips as the younger man coughed and sputtered.
“See? You’re so much stronger than you realize, Eijirou, I knew you could take it all.” Kirishima looked up at Tamaki with wide, wet eyes, drool coating his chin and his cock aching in his costume pants.
“I got it all?” He asked, as if he hadn't been choking on Tamaki’s cock just a second ago.
“Every inch, you felt so good for me.” Kirishima’s face brightened, proud of himself. Not many others could take something like that, there was no way, he was doing well! Tamaki dropped to Kirishima’s height, leaning in to kiss him sweetly, his fingers still laced tightly in Kirishima’s hair. He could taste himself on the redhead's tongue, the filthy kiss making his cock twitch.
“I bet you could do it again.”
“S-Senpai…” Kirishima moaned, Tamaki’s eyes falling to the tent in his pants.
“Are you enjoying yourself?” Kirishima nodded and his cheeks flushed pink, embarrassed.
“If you keep swallowing my dick like you did before, I'll help you cum.” Tamaki let the tips of his fingers skim over Kirishima’s cock, just enough friction to make him squirm. Maybe Kirishima should have thought with his brain and not his cock, but he quickly agreed, letting his mouth hang open as Tamaki stood up. The ovipositor drooled fluid right into Kirishima’s lap as he rushed to lick it away, not wanting to waste a drop.
“Gods, you look like a slut right now, Eijirou. So eager for your Senpai’s cock, even when it's this big.” Tamaki groaned, pushing Kirishima’s head back until it smacked against the brick. The pain didn't phase Kirishima, watching Tamaki with his tongue lolling out of his mouth. Tamaki wasted no time in guiding his cock back into Kirishima’s mouth, groaning as a wet heat surrounded him. Despite having his head held, Kirishima’s tongue laved over whatever he could reach, humming and moaning at the taste. The little noises made Tamaki reckless, thrusting quickly in and out of Kirishima’s mouth.
The ovipositor made a slick sound every time it rubbed against Kirishima’s lips, which were swollen from the abuse. Kirishima gagged again when Tamaki’s cock hit the back of his throat, but he didn't try to pull away this time, not like he had a choice. He tried to breathe around the intrusion, his eyes slipping closed. The salty taste of Tamaki’s precum helped him focus, his hands clenching and loosening around the legs of his too-tight pants. Tamaki paid no attention to Kirishima's reactions, fingernails scraping against brick as he fucked Kirishima’s throat.
He could feel every spasm, every groan, every choke as Kirishima was forced to take his entire cock. Tamaki could feel something akin to orgasm building low in his belly, white-hot waves of pleasure tempting him. It was too soon, though, he didn't want this to end. Kirishima was being so good for him, taking every inch of his length, Tamaki had to reward him for it. He slowed his thrusts, keeping his cock in Kirishima’s throats for seconds at a time. He knew he wouldn't last long if he moved too quickly, biting his lip as he stuffed the entire length of his cock down Kirishima’s throat one last time.
Tamaki held it there, tugging painfully on Kirishima’s hair to pull him closer till his nose was flush with Tamaki’s pelvis. Kirishima started to flail after a moment, Tamaki’s fingers loosening to pet his hair.
“Shh, you can take it, you said you’d do anything for me, Eijirou.” Tamaki purred, watching Kirishima’s eyes go blank and unfocused. He couldn't breathe like this, his throat full and his nose buried in Tamaki’s neatly trimmed pubes. Tamaki counted the seconds as Kirishima cried, fat tears leaking down his cheeks as he choked around Tamaki’s cock, his body fighting him. Before things could get too dangerous, Tamaki started to withdraw, praising Kirishima as every inch of Tamaki’s cock slowly pulled out. He lingered with the last two inches, a shaky moan dropping from his lips as the ovipositor let a single egg slip from its wide slit.
Kirishima gagged, not realizing what was going on as Tamaki pulled out fully, the redhead's mouth dropping open and the egg splatting to the ground. Kirishima coughed, a hand on his chest while the other palmed his cock, forcing himself to breathe. Tamaki watched fondly, stroking the ovipositor as Kirishima’s face turned as red as his body. It took him a moment to come down from whatever space his mind had been in, wiping the drool from his chin and looking down at the egg that had fallen from his mouth.
“Did y-you make that?” He asked, his voice hoarse. Tamaki was surprised he could even speak, leaning down while still fisting his cock in slow, slick motions.
“They come with the package, this is an ovipositor. They're harmless, just messy.” Tamaki moaned as he pushed another egg out, Kirishima’s wet eyes going wide as the egg popped out of the ovipositor, coated in slick, and dropped to the ground to join the other.
“I can't cum unless I put them inside someone, it's like they're in the way. Can you help me with that?” Tamaki felt more confident than he ever had in his life, the heady scent of sex masking any remaining anxiety he might have had. Instead, all Tamaki felt was lust, a primal need to take Kirishima apart with his cock, make him cry.
Later, Tamaki would remember those thoughts and be utterly ashamed that he ever wanted to be so rough with the younger man, but at the moment, Tamaki couldn't care less. His ovipositor ached as more eggs got ready to come out, but Tamaki held them back. Kirishima reached up to wrap a hand around Tamaki’s length, his tongue poking out as he stroked the length of the shaft.
“That won't be enough, Eijirou, can you take more?” Kirishima tilted his head in confusion and Tamaki stood up, gripping the base of the ovipositor before more eggs could flood in. A bit smaller than golf balls, he could feel them inside, itching to get out. Tamaki motioned for Kirishima to get up and he did, his legs shaking a bit beneath him.
“Turn around for me.” Tamaki all but demanded, the redhead slowly pivoting.
“Hands stay on the wall, okay? Be good for me, I'll make sure you enjoy this too.” Kirishima made a little sound as Tamaki shoved at his pants, sighing in frustration when the oversized belt slowed him down. The metal clanked when it hit the concrete, Kirishima’s pants and boxers puddling around his ankles.
“W-wait?! Right here? What if someone sees?” Kirishima hissed, looking around quickly.
“It's a quiet street, that's why you brought me here. No one will see a thing, okay?” Kirishima took a moment to relax, his eyes darting to the street. Not a soul passed by and finally, Kirishima stopped looking.
“O-okay…” He flinched when a hand touched his ass, Tamaki’s fingers feather-light over soft skin.
“No ones ever… not there, at least.” Tamaki hummed, letting his fingers skim lower.
“I'll take good care of you.” “
If it's you, S-Senpai, then I'm not scared…” Kirishima’s voice betrayed him, he clearly had no clue what to expect here. Tamaki liked it, liked the little pitch of fear in Kirishima’s tone, the little shudder when the pads of his fingers ghosted over his hole. He pushed the ovipositor between Kirishima’s asscheeks, grinding slowly so that the underside would rub against his entrance. Kirishima moaned, his head dropping to face the concrete.
“D-don't… don't you have to prep me?” Tamaki shook his head, dragging his fingers through the slick and popping them into his mouth.
“Not with this, you’ll see.” He promised, a puddle forming on the small of Kirishima’s back. Tamaki positively ached , especially knowing Kirishima was a virgin. He was bound to be tight, his little hole the perfect home for the eggs building up in his cock.
“Ready?” Tamaki warned, stroking the ovipositor as he guided the head to rest against Kirishima’s hole. He didn't wait for Kirishima to answer, shoving half inside with a low moan. Kirishima cried out loudly, his fingers hardening and digging into the bricks. His cock jumped between his thighs, precum dribbling to the ground.
“Holy fuck…” He groaned, panting to catch his breath. Tamaki’s cock was nothing like when he took his own fingers, the entire thing slick and hot and pulsing inside of him. The flared base stretched Kirishima open as Tamaki slid home, bottoming out with a sigh. Anytime he used his quirk, some little part of his brain connected with the animal's instincts, and this was no different.
The feral part of his brain was relieved to have the ovipositor in a perfect hole to breed, twitching and threatening to spill the eggs. Tamaki started to move, pulling out till just the head was left inside before snapping his hips. Kirishima almost sobbed when Tamaki set a slow, rough pace. His cock reached deeper inside Kirishima than he thought possible, his body rocking with each thrust. The feeling of being split apart was addicting and Kirishima found himself pushing back on Tamaki’s cock, gripping the grooves he’d made in the brick for balance.
“God, you feel so f-fucking good, Eijirou, wrapping around my cock like this.” Kirishima only moaned, pleasure bubbling hot as fire through his veins. The first egg slid out of the ovipositor as Tamaki shoved it in to the hilt, moaning loudly.
“Ohmygod, I can feel it Senpai, I can feel them.” Kirishima moaned, a few more eggs finding a spot to settle.
“I'm going to breed you so good, Kirishima, perfect little slut for me.” Tamaki groaned, his feral energy taking over. All he could think was ‘ breed breed breed ’, each egg sending unbearable pleasure through his body as it slid through his cock and into Kirishima. He started to move again, his pace picking up as Kirishima wailed. The eggs had shifted to sit right against his prostate, rubbing and rolling against the bundle of nerves with every thrust. His breath caught in his chest as strong shocks of pleasure consumed him, his legs trembling and threatening to give out.
“W-wait, oh fuck Tamaki, i-i'm gonna fall if you keep going, i-i-” Kirishima cried out as his legs were lifted off the ground, looking back to see two tentacles sprouting from Tamaki’s spine. He bit his lip and swallowed down a moan, the show of strength making his cock throb. The look on Tamaki’s face was nothing short of animalistic, his focus centered entirely on fucking Kirishima full of eggs.
It was like a stream now, the eggs getting smaller as Tamaki filled Kirishima to the brim with useless little blobs. His hands gripped Kirishima’s hips roughly, fucking into him with harsh thrusts. Kirishima’s brain short-circuited, every push and pull of Tamaki’s cock moving the eggs inside him, leaving no inch of his walls untouched. Tamaki would pull out and the eggs would take up the missing space before being forced to either side, stretching Kirishima wider.
“That's all of them, you took them all Eijirou, feels so fucking good.” Hearing his normally calm upperclassman curse and grunt did something to Kirishima, barely holding himself up by his hardened hands.
“Gonna cum, g-gonna cum Senpai, I n-need you to make me c-cum!” Kirishima begged, a fresh wave of hot tears cascading down his cheeks. He was being pushed to his limits, unable to touch his neglected cock like this, not without falling. Kirishima was so, so close, his body tense with the threat of orgasm. Laughter emanated from the exit of the alleyway and Kirishima paused, his heartbeat quickening.
They were going to be caught, someone was going to see him, legs held in the air by tentacles as a fucking egg-laying cock drilled into him, and the thought left him sobbing, his arousal heightened. Tamaki must have caught on to the sounds nearby, a massive pair of white wings sprouting from his back, curling around the two to shield them. Kirishima gasped as the wings trapped him with Tamaki, the slick sound of the ovipositor fucking into him so much louder now.
“Mine,” Tamaki growled, a possessiveness the redhead never knew he had. It was enough to send him over the edge, his untouched cock sending load after load of cum to splash against the pavement. Kirishima wailed, his back arching and hardened fingers digging harder into the brick. Tamaki moaned as Kirishima’s hole tightened around him, clenching rhythmically as he rode out wave after wave of mind-numbing pleasure.
Tamaki had been close, his hips stuttering a few more times before he sheathed himself fully in Kirishima, his orgasm washing over him. Tamaki pressed his chest to Kirishima’s back, groaning against his sweaty skin as he spilled hot inside the other. His tentacles tightened, almost cutting off Kirishima’s circulation, wings fluttering and dropping feathers all around them. Kirishima’s orgasm felt like it lasted forever, his vision white and ears ringing as he felt warm cum pulse inside him, coating the eggs and branding every inch of his ass. His eyes hurt from how hard he was crying, overwhelmed by the sensations as Tamaki slowly came to his senses.
“Did I hurt you?” He asked, a nervous edge to his voice. Kirishima shook his head, sniffling as he was gently set on his feet. He let his quirk fall, dusting the little pieces of brick off before wiping at his eyes.
“It w-was just so much…” He muttered, his chest heaving. Tamaki’s hands wound around his waist, keeping them close as Kirishima tried to compose himself.
“You were so good for me, you did so well, I took it a l-little too far there.” Kirishima hummed, shifting his weight and groaning as the eggs adjusted inside him.
“It was amazing, Senpai, I've just never felt anything like it. I can still, gods, still feel them in there.” Kirishima peered down and touched a hand to his belly, slightly distended where the eggs had carved a home inside him.
“H-how do they come out?” Kirishima asked sheepishly, feeling the ovipositor give an interested twitch inside him. Tamaki muttered a curse and chewed his lip, slowly starting to slide out of Kirishima. He mourned the tightness, the wet heat that had thoroughly milked his cock just minutes before.
“I'll help, it u-usually isn't hard…” The normal sheepishness returned to Tamaki’s voice, taking inventory of the damage. He retracted his tentacles and, once he had pulled out from Kirishima, the ovipositor, leaving the wings to shield them from onlookers, just in case. The ground was splattered with slick and cum, a few eggs from earlier glistening in the mess. Kirishima’s breath hitched as the first of the eggs started making their way out of him, sliding against his sensitive walls.
“O-oh fuck, it feels good, why does it feel so good?” Tamaki swallowed thickly, one hand cupping Kirishima’s ass and massaging the pliant flesh. He pushed him to lean forward, giving him a better view as his hole gaped around the eggs.
“Mirio likes to, uh, t-touch himself usually, he says it helps, and it makes it feel even better.” Tamaki’s face was bright red with embarrassment, thumb tugging at Kirishima’s rim to help a few larger eggs get through. They hit the ground with a wet slap, Tamaki’s cum leaking down Kirishima’s thigh. Kirishima wrapped a hand around his spent cock, already filling again as the eggs started coming out.
Once he started pumping his cock quickly, the eggs came out easily, until Kirishima was spilling into his own hand and clenching around nothing. Tamaki’s own cock was half hard from watching but his body was too exhausted to do anything more. Three different manifestations during sex took a toll on him, and Tamaki wasn't sure how he was going to get Kirishima back to the agency like this.
He glanced at the ground, the puddle of cum-slicked eggs at his feet. Kirishima could barely stand on his own, thighs trembling and covered in long bruises from Tamaki’s tentacles. His pants were covered in the mess and his boxers no better, unsalvageable. The only thing saving them now was Tamaki’s wings, and he couldn't very well hide Kirishima behind them for almost a mile. With a sigh, Tamaki pulled out his phone and speed texted Nejire, hoping she wouldn't ask too many questions before he could get Kirishima cleaned up.
“Someone will be here soon to get us, are you okay?” Kirishima nodded, straightening up and shakily stepping out of his ruined pants, trying not to squish the eggs under his boots.
“But… I…”
“It's okay, Hadou understands that I… do things like this sometimes.” Kirishima seemed to understand, looking around nervously.
“Did I help?” He asked, fidgeting.
“I mean, you seem to be doing better now man! I've never seen you act like that, and now you’re back to normal so… I think I did something right.” Tamaki managed a soft smile, leaning in to press a kiss on Kirishima’s bruised lips before shyly pulling back. The sharp contrast to the action compared to what had just transpired left Kirishima’s head spinning.
“You helped, you did a-amazingly. Normally I go to Mirio for this, I just get… bottled up.” Kirishima nodded, pushing the sagging spikes of his hair off of his forehead.
“I'm always happy to help you, Senpai! And, uh, if you ever need to use me again, I'd be more than happy to be bred by you again!” The excitement in Kirishima’s voice made Tamaki’s heart skip a beat. Sure, he’d gone a little overboard, but it was obvious Kirishima liked it just as much as Tamaki had. If he survived the drive with Nejire, Tamaki would have to look for Kirishima next time his needs got out of hand.