Chapter Text
It was a beautiful day in early March, and Shouto was having lunch on the school roof with his boyfriends. It was the first day warm enough for the three of them to enjoy being outside without Izuku and Katsuki jockeying for position to be able to leech heat from Shouto’s left side. (Katsuki was particularly fierce in those ‘fights.’ He refused to admit it, but he hated the cold weather and was a bit of a baby about it.)
It was only a couple of weeks until graduation, and Shouto was determined to make the most of the days they had left at UA. Izuku was dozing in the sunshine after practically inhaling his food, while Shouto and Katsuki sat together and ate at a more sane pace. The whole while, Shouto was soaking in the moment as much as he could, trying to hoard as many memories as possible before school ended and everything changed on him again.
Not that he was complaining about the most recent paradigm shift in his life. It had been good for him in so many ways, big and small. For example, one of the many changes he appreciated was how, since they had started dating, Shouto’s lunch fare had significantly improved. Katsuki had found out how inconsistent Shouto was about eating his lunch and had been appalled. (It was mainly dependent on how tolerable the cafeteria food was that day. Lunch Rush was an excellent cook, but some foods were not edible for Shouto, no matter how well they were made.)
Katsuki decided he was going to make Shouto's bento from then on and wouldn’t take no for an answer. He had caved quickly to his demands when he found out that Katsuki had no problem with adjusting the contents to Shouto’s tastes. In return, he insisted on Katsuki using his father’s credit card for all of the groceries, not just Shouto’s. The system was working out well so far, and now he was savoring yet another delicious meal with wonderful company.
So obviously, changes weren’t always bad, even if, historically, Shouto had not had an easy time with them. Still, the permanency of no longer being a student at UA was a daunting prospect and made him all the more desperate to imprint these precious last days in his mind.
While Shouto was ruminating on all of this, Katsuki was telling a story that he had been only half listening to (and even that half-attention was mostly so that Shouto could amuse himself with all the colorful phrases Katsuki was using). “...so when Shitty Hair rolled up with the fucking thing tied to the roof of the car, I was like, well, smack my ass and call me Daddy, I didn’t think you’d actually-”
Unable to resist the siren call of such a blatant opening, Shouto interrupted. “I understand you wanting your ass smacked, but I thought you were the baby, not the daddy? If anything, Izuku would be the daddy.” It was something that had occurred to him a while ago, when Shouto first fully processed just how often Izuku referred to Katsuki as ‘baby’ in private. That, plus Izuku’s general vibe in… certain scenarios, had made him wonder.
So far, Shouto hadn’t seen any evidence that they thought about it that way, but it might just be some strange hang-up about acknowledging it while he was there. Shouto couldn’t deny that he was curious, so he took the opportunity to bring it up. And if he got to mess with Katsuki and fluster him a bit, all the better.
When it came, the reaction was better than Shouto could have hoped. He had been prepared for a minor explosion, but instead, Katsuki only got halfway through an indignant “YOU-” before the yell was strangled in his throat. A fiery red blush erupted over his whole face, and his palms crackled erratically in the way they only did when he was too overwhelmed to properly regulate. He tried a couple more times to form words, but any sound died before it reached his tongue.
Oh, Shouto had hit the jackpot. A truly dumbstruck Katsuki was a rare sight. A delighted smile took over Shouto’s face. Katsuki noticed almost immediately, and his face twisted into a venomous scowl.
Whoops. Shouto knew he hated being laughed at, but, well… he couldn’t honestly say he was sorry. It was too much fun to rile Katsuki up. All the moment needed was– ah, perfect, Izuku just woke up. Luck was certainly favoring Shouto today.
In a sleepy voice that was so adorable it should be illegal, Izuku asked, “Shou? Wha’ happened, why’s Kacchan blushing like that?”
“Well, he was telling me about a dare Kirishima did, and said, ‘Well, smack my ass and call me Daddy.’” Shouto put air quotes around that. He wasn’t entirely sure he was using them correctly, but if he wasn’t, he trusted Izuku to let him know and not laugh at him. “I’m not sure exactly what that means, but I assume from context that it’s one of Tsuki’s odd idioms. So I told him that I thought he was the ‘baby’ and that if anyone was the ‘daddy,’ it would be you.”
He was rewarded for his retelling with a delighted laugh, as pretty as Izuku's laughs always were. Then he turned to Katsuki with a contemplative look in his eye. “Well, you are my baby. Would you like to call me that?” he asked, his head tilted in a way that looked far too innocent for the subject matter they were discussing.
Now that the question had been posed, Shouto was intrigued by what Katsuki's answer might be. It... had seemed to Shouto like he would like that, but he didn't want to make assumptions, especially not about something like this. When he followed Izuku's gaze, what he saw certainly seemed to support his theory, though. Katsuki's eyes were wide, the color high on his cheeks, and his hands were still popping arrhythmically. He bit his lip before answering with a slight stutter. “I- I don’t fucking know. Wouldn’t that- would that be weird for you? …for either of you?”
Oh. Katsuki was asking him? That was sweet, but unnecessary. Shouto knew what his answer was, but he took a small pause to gather his words, anyway. He wanted to get this right. “I don’t think it’s a problem for me, no. If you’re worried because of my father, I’ve never called the old man that in my life. It was always ‘Father.'" He was fairly sure that was the reason Katsuki thought it might be 'weird' for Shouto, anyway. Just in case it wasn't, though, he added, "And I get it. Izuku is very… parental when he’s in charge. Well, what I assume good parents are like, anyway. Caring, encouraging, coddling, indulgent, teasing to embarrass… it makes sense.”
That was a big part of why Shouto had come to that conclusion in the first place. Katsuki made a considering face at that, like it was a perspective he'd never considered before. He didn't seem like he was denying it, at least.
Shouto was caught a little off guard when Katsuki, rather than addressing Izuku, asked him, “So would you want to call him that too, then?”
Huh. Well, Shouto supposed that was a fair question, considering the context. It was an interesting idea, at the very least. He didn't think it was something he had any particular predeliction to, but... “Maybe? I’d be willing to try it out, at least.” After all, there were quite a few things that he hadn't been particularly interested in for its own sake, which had been very pleasurable when done with his partners. Pulling the conversation back to the other member of their trio, he checked, “Is that something you’d be interested in, Izuku?”
Izuku's signature strawberry blush flared at the attention, or maybe the question itself? It was hard to tell. “I- Yeah, I think I might like that. With both of you. I wou- I don’t know if I- I’m not sure that I would act quite the same way that I normally do," he clarified hesitantly. "I- Even thinking about it kind of makes me want to wrap you both in blankets and feed you snacks, but also fuck you ‘til you cry??? So it’s somewhat different than my normal headspace, I think.”
Oh. Oh my. Well, Shouto didn't have any complaints about that, none at all. The loud gulp from Katsuki said that he felt similarly about the prospect. Wanting to make his stance very clear, he said, “That sounds nice to me, so…” The sentence fizzled out, Shouto unsure how to phrase a request to make that happen soon.
Katsuki seemed to understand what he was getting at, though, because he nodded decisively in response. Between the two of them, he was sure they would concoct some sort of Plan, at least. Shouto would leave them to it. For now, he concentrated on finishing his bento before they had to head back to class. It wouldn't do to miss out on Katsuki's delicious cooking, after all.
Shouto had spent the rest of the school day in a bit of a daze. He still wasn’t quite sure how to deal with the recent development. On the one hand, it was reassuring to know that the whole ‘baby’ thing hadn’t been something he imagined or that they were holding back. And, well, watching Katsuki get so incredibly flustered from an idea that Shouto had was uniquely delightful.
On the other hand, though, he was nervous. Shouto was fairly sure they intended to test out said idea soon, probably today. Before this, all of their activities had been things Izuku and Katsuki were well-practiced in, or at least familiar with. It had been reassuring to know that even if Shouto often felt out of his depth, they knew what they were doing. Not having that reassurance was more than a little nerve-wracking.
More than that, though, was the simple fact that Shouto wasn’t sure where he fell into this new dynamic. He hadn’t registered how much he had been falling back on their typical team dynamics (despite the very different context) until he tried to do it for this and came up short.
Calling Izuku ‘Daddy’ would certainly be… something, and both of them had seemed interested in it, so Shouto was more than willing to try. He didn’t think any of them wanted him to be the focus, though. Maybe he could still be Izuku’s support? That sounded nice, but Shouto wasn’t sure how that would even work.
Shouto sighed, shook himself from his thoughts, and opened Katsuki’s door with the key he’d been given. Both Izuku and Katsuki had said many times that Shouto was allowed to ask as many questions as he wanted. He would just have to take them up on that. He looked around, wanting to get started on that, but-
Oh. He’d been so caught up in his own worries, he hadn’t noticed that he was the first one to arrive. Well… shit.
Shouto trudged over to the bed and sat down heavily. Waiting alone was never fun, but he did his best to turn off his thoughts until he had some sort of outlet. He was well-versed in how to keep his thoughts from spiraling while sitting alone, waiting, so that was what he did.
Katsuki was the next to arrive, but he seemed uncharacteristically distracted, compared to his normal method of arrival (which tended to involve some level of pouncing once he registered Shouto’s presence). He wasn’t sure why until they locked eyes for a second and Shouto clocked the strung-out cast to Katsuki’s features. Oh. He Wanted this, badly. Maybe even Needed it, and the normally compulsively proactive boy had been stewing in that feeling for hours now.
Some of the anxious tension in Shouto’s gut shifted, translating into protectiveness and a much more pleasant hunger. There was something incredibly alluring about Katsuki being so undone, especially by something Shouto had a hand in creating. Katsuki wasn’t quite spacey yet, but he could see the potential of it in his heightened breathing, his low flush, and red, too-wide eyes.
It was perhaps a bit unhealthy, how often the sight of Katsuki’s agitation could soothe Shouto’s own. Granted, it was usually in the context of anger and frustration, but they were all flavors of passion, and it seemed that route in Shouto’s mind was well-paved enough to hold this anxious arousal, too.
Still, the sudden shift was its own kind of unsettling. Shouto felt a wave of gratitude when Katsuki sat beside him, the scant centimeters between them both an offer and a request wrapped in one gesture. Shouto eagerly took him up on it, leaning heavily against Katsuki’s wide shoulder and clutching his hand like an anchor in a storm.
Shouto was unsure if the soft warmth that spread from his center was more metaphorical or literal. Either way, he basked in it as Katsuki took his weight with grace, his breathing steadying at the connection. Shouto sat there, attuning himself to the sound of those slowing breaths, counting them to mark the time while they waited for the last piece of their triptych.
After 63 breaths, they both heard the door latch open, quickly followed by shuffling footsteps and the series of impacts and clicks that meant Izuku had locked the door, including the deadbolt. A palpable ripple of released tension swept through Katsuki at the sound, and the hand Shouto held flexed and twitched with a restrained anticipation. The constant low pressure Shouto was pushing into their joined shoulders went from held to reciprocated, and the joy of being leaned on by Katsuki tasted like soda-sweet, effervescent bubbles on the back of his tongue.
It only got sweeter at the sight of Izuku’s easy smile and attentive eyes looking them over. Izuku’s head tilted a few degrees the way it did when he noticed something fascinating. Shouto wasn’t sure he’d ever get used to being the object of that intense gaze, not entirely, but it wasn’t a bad feeling. He could see how Katsuki might feed off of it with his perpetual attention seeking, but for Shouto, it was less about being noticed and more about being Known.
All his life, Shouto had been used to being stared at, though admittedly not usually at the level that Izuku did. It was only once Shouto had been exposed to the cutting perceptiveness behind those green eyes, though, that he had begun to shiver when they lingered on him. Izuku had always seemed to pay him more attention than most of their classmates, though Shouto had endlessly reminded himself that it was platonic.
Remembering that now, when Izuku himself had told him that it very much wasn’t, sparked a small rush of epiphany, something that had happened at least a few times a day ever since these two had taken him into their bed. Even with how often it happened, it still made his breath catch. At that same instant, he felt the soft press of lips on the side of his face. The performative little smacking noise Izuku always made when he kissed his cheek was doubled as he quickly switched targets, wedging his face between Shouto and Katsuki affectionately.
It wasn’t until he heard Izuku greet each of them by name with his typical fond warmth that Shouto realized neither he nor Katsuki had spoken a word this whole time. Before he could gather himself enough to respond in kind, Katsuki filled the gap by snatching Izuku up into a proper kiss, deep and eager. Both pulled away from it panting, and Izuku gave a delighted laugh. “Kacchan is so excited today,” he teased. “Does this mean you still want to try out what we talked about earlier?”
Katsuki nodded, and Shouto did too when Izuku turned to him, for Katsuki’s sake as much as his own. With the immediate recalibration in his expression that said Izuku had laid out a Plan in his head for this scenario already, he turned back to Katsuki and asked, “And would you like me to fuck you today, sweetheart?”
It still threw Shouto occasionally, how easily that sort of crude proposition came to Izuku's lips when they were like this. He was used to Katsuki’s foul mouth, but hearing ‘fuck’ in that clear, chiming voice was still odd, though thrilling. Shouto was swiftly pulled out of his mental stumble, though, by Katsuki’s emphatic “Oh, hell yes.”
Izuku’s sweet, freckled face turned again to him, and this time the look in his eyes was heated and dark. “And you, Shouchan?”
Shouto considered the offer. It hadn’t been very long since Izuku had done that for the first time, and while it was swiftly becoming one of Shouto’s favorite activities, the process of working up to it, especially with Izuku’s size, was still rather… involved. Shouto wasn’t sure how exactly this was going to go, but he didn’t think he wanted to add all that on top of everything else.
Slowly, shook his head. Then, reconsidering the actual wording of the question, Shouto clarified, “Not that way, at least.” His voice caught a bit as he remembered exactly how Izuku might ‘fuck’ him without any penetration at all. Izuku’s eyes flicked down to Shouto’s fidgeting lap, and his mouth quirked up in a knowing smile.
“Understood, darling. I’ll keep that in mind,” Izuku assured him, with only a slight edge of throatiness to expose his own want. “Katsuki, baby, are you okay with our usual safety measures, or do you need something different?”
“No, no, I’m good with the usual shit.” Katsuki’s words practically tripped over themselves on the way out in their hurry. It was unexpectedly charming, and Shouto laughed quietly. Izuku seemed similarly taken with Katsuki’s blatant eagerness, smiling broadly in response.
That smile turned sharper, followed by a wickedly enticing sideways look toward Shouto. “Shou, love, could you help me get Kacchan undressed, please?” Izuku asked, the grit from before smoothing out into a syrupy siren’s call. Shouto heeded that call without a second of hesitation, moving to unbutton Katsuki’s shirt without a word. Meanwhile, Izuku’s hands went down to undo his trousers.
Katsuki caught on quickly, squirming to work the waistband of his pants down out from under him. Shouto took great delight in brushing his fingers over the exposed skin of his chest as he opened Katsuki’s shirt and worked it off of his wide shoulders. Each touch was chased by little shivers that were incredibly satisfying.
At some point, Izuku had gotten down on his knees, presumably to get Katsuki’s pants the rest of the way off. He seemed to have gotten a bit sidetracked, though, because he was currently holding up a pair of briefs. There was… a sizeable wet spot on them, glinting slightly in the center with something sticky. Shouto was a bit confused, but he had to admit that the bright pink that Katsuki’s cheeks turned was definitely a positive.
Before Shouto could even begin parsing through the implications, Izuku said, deep as a panther’s purr, “Oh, baby. You must have been really excited for this.” His tone curled into that indulgent, half-mocking pout that he sometimes turned on Katsuki. “Was it hard, not squirming in your seat, sweetheart?”
Shouto watched as Katsuki’s pupils blew open, his throat bobbing with an affected swallow. He wasn’t sure the blond was even aware of the slow, spell-bound nod he made, but Shouto didn’t doubt the truth of it.
“You did a great job, baby,” Izuku complimented, voice sticky-sweet. “I was sitting right behind you and I didn’t even notice.”
Katsuki, predictably, puffed up at the praise, soaking up the words like a soft sponge. Shouto barely had time to process how- how cute Katsuki was, when Izuku’s tone shifted back to the rumbling, predatory timbre from before. “I’m not sure I could have made it through class if I had known how worked up you were. Might have dragged you out to the bathroom in front of everyone and fucked you full then and there.”
Katsuki’s cock twitched visibly, and Shouto wasn’t faring much better. Heat from his quirk rose instinctively, and he scrambled to tamp it back down. He’d had quite a bit of practice recently, but he was still learning how to keep his quirk in hand through the spikes of lust he was now exposed to regularly. There was no way the image of Izuku, overcome with want, stealing Katsuki in broad daylight to fuck him silly, wouldn’t trigger one such spike, but Shouto rode it out the best he could.
Izuku wasn’t done, though. Tinged with a saccharine, false pity, he continued. “And then poor Shouchan would have been left behind, having to sit there knowing exactly what we were doing, and not even getting to watch.” The fact that Izuku thought to place Shouto in the little scene he painted was surprising enough, but the genuine consternation on Katsuki’s face at his imagined self’s predicament made something in Shouto’s chest melt.
He was pretty sure that if he were ever actually in that position, Shouto would be far from complaining, and that was if he didn’t just run after them and damn the consequences. Still, when Katsuki reached out to him beseechingly, Shouto went easily into the kiss, sweet and warm as a fresh pastry.
When Shouto finally pulled back, he saw that Izuku was back on his feet. With a casually proprietary gesture, he dragged his fingers through Katsuki’s hair, cupping the back of his head to redirect his attention up to Izuku. “Okay, love. Now,” he said before swooping in to steal a kiss of his own, “could my baby please go get cleaned up for me?” Katsuki’s nod was more hesitant this time, and Izuku switched from cajoling to reassuring. “I’m just going to ask Shou some questions and remind him of our rules. I promise we won’t start without you, baby.”
The storm cleared from Katsuki’s brow. He sighed and levered himself up with his usual feline grace still mostly intact, despite his total nakedness and arousal. Shouto watched his backside shamelessly as he walked away, and with the way Katsuki turned to him and winked, he knew it. Izuku sat down next to him, and there was a reflexive nervousness at ogling his boyfriend in plain sight. The bright smile he received quickly reminded him that behavior was not only accepted but actively encouraged now.
Still, the frisson of fear had been enough to clear some of the lustful fog that was gathering around the edges of his thoughts. He hastily rearranged himself to alleviate the biting pinch of his zipper and make his still-clothed arousal less obvious. Clearing his throat, Shouto prompted, “You said you had questions for me?”
Izuku hummed in acknowledgement. “I do. But first, could I get a kiss?”
Shouto blinked in surprise at the light-hearted request, but he had yet to deny a single thing Izuku had asked of him, and he wasn’t about to start now. He sank willingly into Izuku’s soft, wide mouth, curling his arms around his waist to rest. Izuku, in turn, raised his arms, first to caress Shouto’s cheeks with his thumbs, and then to lay his elbows on Shouto’s shoulders in a loose embrace.
Shouto had assumed the kiss would be a quick thing, a small gesture of affection before getting back to the topic, but Izuku apparently had a different idea, holding him close and caressing with teeth and tongue until Shouto felt thoroughly ravished. Only when he had left him with half-lidded eyes and ragged breathing did Izuku pull away.
He made a contented noise in the back of his throat, the same way he did after a good meal, making Shouto blush further than he already was. “Better,” he declared with satisfied smugness, still holding Shouto close. “Now, honey: how are you feeling about our plans for tonight?”
Shouto held in a sigh at the question, which was quickly becoming routine. Trying to describe his own feelings about anything was still a struggle, but at least Izuku had stopped leading with the even more nebulous ‘How are you feeling right now?’ “Good. Curious.” After some hesitation, he added, “A little nervous.”
Izuku’s expression softened. “That’s understandable. This is the first time all three of us are trying something new together. Is it just that, or was there something else worrying you?”
Shouto took his time getting the right words together. “I am not sure where my role is in this. Or where you both want me to be.”
Izuku tilted his head again, and Shouto fought the urge to curl up and hide away from those prying eyes. Assertiveness in the face of uncertainty was something he still struggled with, despite how often he berated himself for that. “Well,” Izuku said simply, “I think the most important thing is where you want to be. But if you want to know my preference, I’d like to be in charge of this, but I’m equally happy to have you down with Kacchan or even under him if he’s up for that, or have you be my support while we both focus on him if you’d prefer.”
Something was settling about Shouto having his options laid out for him so succinctly. The firm knowledge that Izuku was indeed leading right now helped, too. He’d mostly known that already, but even so, the certainty gave him enough stability to gain some footing.
Shouto had learned in the last few weeks that as long as Izuku was able to be upright, he loved having Shouto drape himself all over him, and so he took full advantage of that knowledge. Shouto turned away and flopped back lazily, resting his head back on Izuku’s chest and letting his spine curl and melt over his lap. If he craned his neck, he could even look up at the besotted smile Izuku gave him for his boldness.
“Hi there, love,” Izuku said dopily before gathering Shouto’s limp upper body up in his arms, hefting him closer, and adjusting them both to be more comfortable. Shouto sighed and relaxed further into the embrace, taking comfort in the surrounding touch. The feeling of being held in those strong arms had yet to get old, and he basked in it for a bit. He was sure there were other things they needed to talk about, but the prospect was much less daunting when he was being held like this.
Izuku kissed the top of his head and then went on with the ‘briefing’. “Just to be extra clear, when you said ‘Not that way,’ did you mean you didn’t want anything penetrative at all?”
Shouto nodded. “Not today. Too much work,” he clarified. (Just in case Izuku somehow thought it had anything to do with the whole ‘Daddy’ thing itself. Katsuki had made enough ‘daddy issues’ comments under his breath for Shouto to be aware of some of the more... unfortunate assumptions they might make.)
Izuku chuckled and ran his palm in long strokes over Shouto’s exposed belly. “It should surprise me more how much of a lazy cat you can be like this, but it suits you somehow,” he said indulgently.
Shouto chose to take the comparison as a compliment. He had certainly liked the cats in cafes who liked to snuggle against him. (From how they congregated on his left, it was probably just because they liked the warmth, but Shouto wasn’t above using his advantage to claim more of the purring furballs, especially when it made Shinsou glare and Katsuki rile himself up in a competitive fervor.)
Izuku hummed thoughtfully. “I was hoping to get my mouth on you tonight. If you’re not up for it, I have plenty of other ideas, but if you are, you would still need to do the cleanup part at least.”
Shouto flushed at the suggestion, and he bit his lip, torn. “You don’t have to decide yet,” Izuku offered. “We’ll probably take a break at some point, and you could clean up then if you want.”
Shouto took him up on that compromise with an agreeing hum. “It’s a deal, then,” Izuku said, satisfied.
“As for safety, do you want to use your colors?” Shouto, through some trial and error, had found that it was much easier to reach for ‘red’, ‘yellow’, and ‘green’ than it was to say ‘stop’, ‘wait’, and ‘go ahead’, especially when he was ‘floaty,’ as they referred to it. He wasn’t sure why that was, but reasons wouldn’t change the fact of it. Izuku had only put up a bit of initial resistance at first, but having the former didn’t have to mean they were disregarding the latter, and as soon as Shouto agreed that it was only an addition, not a replacement, it had been neatly slotted into Izuku’s habit of ‘briefings’ as part of their safety plan.
Shouto agreed with the familiar suggestion, and to using snaps as a signal to check in when Izuku added it. Tapping out, Shouto had learned, was a universal signal with Izuku and Katsuki, in place at all times and instinctive enough not to need a habitual reminder, but he silently tacked it onto his mental list.
More cautiously, Izuku brought up his last point. “I also- well, I was wondering if… It seemed to me like you were more ambivalent about the whole ‘Daddy’ idea than Katsuki.” He didn’t phrase it like a question, but he seemed to be looking for an answer anyway. Shouto shrugged and nodded slightly. It was a fair assessment.
“That’s just fine with me, love. But I wanted to offer… Well, if it feels right, you could always call me ‘sir’ instead. If you want,” Izuku explained, his tone unaccountably nervous. Still, the idea sent a frisson of something up Shouto’s spine, making his eyelids flutter with it. He let out a low groan, barely stifled behind his teeth.
Izuku definitely heard it anyway, judging by the stiffening hardness Shouto felt against his spine. Izuku responded with a relieved sigh. “I take it you liked that idea?” he teased, his voice dipping back into that confident smoothness. Shouto nodded, unable to even pretend he was unaffected. “Good,” Izuku said, nuzzling his cheek into Shouto’s hair. “I still want to hear you call me Daddy at least once while you’re in subspace, though,” he whispered. “If you don’t like it, we can drop it, but could my sweet boy try, at least once? For me?”
Shouto had been planning to anyway, so the overkill was almost insulting, or at least it might have been if Shouto’s thoughts hadn’t turned to soup from the combination of Izuku’s seductive words in his ears and the realization that he Wanted this, maybe even as much as Katsuki did. His responding “Yeah” was breathy and brimming with provoked lust that disguised his surprised awe at having inadvertently given both of his partners something they actively enjoyed.
Needing more of a physical outlet, Shouto flipped over, crawling into his lap as much as he could as he mouthed at Izuku’s neck. Izuku let out a smug hum at the treatment, holding Shouto close and tilting his chin to give him more access. “My sweet boy,” he crooned happily.
Shouto kept it up until Izuku gently tapped his side, alerting him that Katsuki was coming back soon. Not unkindly, Izuku lifted Shouto off his lap and set him to the side, stroked Shouto’s hair, and pressed a grateful kiss to his forehead. “Alright, honey, it’s time. I’m going to put Katsuki in headspace first. Do you want to join in once I’m done, or would you like to sit back and watch for a bit first?”
Shouto considered his options. “Can I… help? Somehow?” he asked.
Izuku smiled. “I think I can figure something out, yeah. You want to just be my helper for now, or is this part of being my sweet boy?” he asked with a casually affectionate swipe at the corner of Shouto’s mouth, clearing away the slight mess he’d made with his sloppy kissing.
The casual parental gesture did something to Shouto, shifting his headspace softer and a bit to the left, reminding him of his initial assessment about Izuku’s leadership style at lunch. Huh. Maybe calling Izuku ‘Daddy’ didn’t just make sense for Katsuki.
Before, he might have been unsure, but now Shouto replied firmly, “Your sweet boy.”
Izuku’s eyes widened at the confirmation, but the reaction seemed like a happy one. “Alright, then. Be good and sit still for a bit, and I’ll let you know how you can help soon,” he instructed just as padding steps approached. Instead of pulling away from him, though, he planted a lingering kiss on Shouto’s cheek, not ending it until Katsuki had certainly seen the gesture. Only then did Izuku turn to look at the blond, his skin still dewy and flushed from the hot water.
Green eyes scanned over Katsuki appreciatively, and Shouto was helpless to follow (not that he tried very hard to resist). He was gorgeous, and Shouto was still reveling in the fact that he got to see him like this, naked and unashamed. As subtly as he could, he activated his ice to cool the blood rushing to certain areas. He wanted to at least try to stay collected long enough to assist in the way that he had offered to Izuku.
“Come here, baby, I want to give you a kiss, too,” Izuku crooned with a coaxing crook of his fingers. In a few quick strides, Katsuki had crossed the room, but before he could even fully bend down to receive the promised affection, Izuku grabbed a thick handful of his hair and pulled Katsuki down forcefully to meet his lips.
It caused Katsuki to stoop awkwardly for a few moments, but, in a masterful set of maneuvers that Shouto could only watch with awed respect, Izuku stroked his thighs and guided Katsuki into straddling his lap, all while never faltering for a moment in what looked to be a devastating kiss.
When Izuku finally pulled away, Katsuki’s eyes blinked open hazily, and the rumbly, drawled “Good boy,” that followed had his expression going slack with overwhelmed pleasure. Shouto was sure he’d be the same if he were under the same sort of targeted assault, especially since it seemed like only the beginning on Izuku’s part. There was an odd sort of sympathy in that, or would that be empathy? Either way, it was a fascinating thing to watch him lead their dance so skillfully.
Just as it looked like Katsuki was rallying to pour his energy into the kiss, Izuku tapered off and pulled away, leaving the other boy grasping for more, getting only a gentle, soundless shushing in return. Izuku smiled softly up at the agitated boy perched above him innocently, like he hadn’t just effortlessly wound Katsuki around his finger. “Hello, baby,” he greeted, his voice sticky with affection. “Are you excited for this?”
Katsuki reared back with an affronted look that had Shouto fighting a chuckle. To be fair, it was blatantly obvious what the answer was with how ramped up Katsuki had already become, not to mention what had happened just before he left. The blond scoffed, and rather than answering with words, he ground down on Izuku’s lap and asked, “What do you think, Deku?”
Izuku hummed thoughtfully, giving no sign that he was affected by Katsuki’s rolling hips. “I think… that that’s not the name you want to call me right now, is it?” Izuku asked, a thread of steel weaving its way through the softness of his tone. His hands curled over Katsuki’s hips, and the undulating motion of them stopped abruptly and involuntarily.
With a sense of awe, Shouto looked at Izuku’s arms and saw no sign of strain, with only a slight tension to indicate that he was expending any effort at all to hold Katsuki still. This was despite the fact that the man in his hold was squirming with all his strength against the grip as Shouto watched breathlessly.
After a few moments of struggling, Katsuki stilled with a horny, and just a touch plaintive, whine. “Izu, fuck, come on,” he entreated, already several degrees more conciliatory than when they had started.
“Hmm. Better, though not quite what I had in mind,” Izuku hinted lightly. With just a tinge of that babying tone, he asked with false concern, “What’s wrong, sweetheart, are you feeling shy?”
Katsuki’s face screwed up into a disbelieving scowl. “No, I’m not fucking shy! I just-” He was cut off by Izuku yanking at the back of his hair, forcing his chin up and chest out in a stunningly erotic display. Katsuki gasped, cursing in surprise.
Izuku gave a small, self-satisfied smile at the reaction. “Ah, I understand now. My pretty baby needs some help getting down before he can be Good for me like he wants, isn’t that right?” he cooed, holding Katsuki while he writhed in his lap. His lips fell open, and a moan fell out of them, spilling like a mouthful of water into the space between them. Katsuki stiffened at the accusation, but rather than denying it, he relaxed into Izuku’s hands with a shudder.
Shouto let out a breath of awed relief, and it was only then that he noticed that he had been holding it for so long. He watched rapturously as Izuku’s hands shifted to support rather than restrain the boy in his arms.
“That’s it, sweetheart, just like that,” Izuku called smoothly, all trace of mockery washed out in a wave of adoration. “Look at you, baby, you’re being so good for me, letting me hold you. Come here, pretty boy, let me kiss you.”
Katsuki seemed to turn to liquid under the flood of sweet words, following Izuku’s guiding hands into a slow, seductive kiss. By the time he was done, Katsuki was a dazed mess, and honestly, Shouto wasn’t much better. His jaw had dropped open at some point, and he had to swallow heavily to avoid embarrassing himself with how much his mouth was watering.
“Now,” Izuku breathed, “will my baby boy tell me what he wants first? Anything you want, love, we’ve got all night.”
Katsuki’s voice, when it came, was throaty and wavering. “Wan- Wanna suck you.” The dry rasp in his words only accentuated the luridness of the request.
Shouto was expecting Izuku to do what he normally did when either of them had made a request like that and agree immediately, so it was a bit of a shock when Izuku instead hesitated, angling his head like he was listening to some far-off sound.
He tilted Katsuki’s chin gently upward with a curled finger. “Is that all, or did you want to ask for something like a Good Boy?” he asked enticingly, and now Shouto could see the shape of the game Izuku was playing.
Sure enough, whatever flimsy resistance Katsuki had mustered crumbled with a whine that sounded like it was pulled directly from the center of him. “Please, Daddy, fuck my mouth. Wanna be Good.”
Despite knowing what was coming, Shouto still gasped at the sheer intensity of want that rushed through him at the sound of Katsuki begging like that, the pout of it creating a hint of a lisp, like a child begging for a sweet.
Izuku was similarly affected, judging by the way he shuddered and bent to kiss Katsuki like a man starving. “Fuck, baby. So Good for me,” Izuku said in a strained half-murmur. “Yeah, I’ll fill that pretty mouth of yours as much as you want. Want to spoil you rotten, sweetheart.”
Shouto had known, intellectually, that Izuku was extremely persuasive and, if necessary, could use that talent with his partners, Katsuki especially, given how deeply they knew each other. He’d seen minor examples of it even before he’d been extended the privilege of being invited into their intimate activities, but that was a far cry from seeing… this. This effortlessly deft, benevolent manipulation that turned a fierce, sharp-edged fighter into putty in Izuku’s hands in a matter of minutes.
From anyone else, it would have made Shouto wary and guarded to see such a strong will so easily subverted, if only to protect his own closely held autonomy. But, knowing that it was Izuku enacting it, all Shouto felt was awe and a soft longing to be similarly shaped under those sculptor’s hands. He could be patient, though, especially when the reward was getting to see Katsuki come undone right in front of him, and potentially even contribute to that undoing.
As if Izuku had heard Shouto’s besotted thoughts, he turned and smiled at him, bringing him in from the audience back into the tableau. “We’re going to take such good care of you, aren’t we, sweet boy?” Shouto nodded dutifully, squaring his shoulders to ready himself for whatever task Izuku might ask of him.
The warmth in those green eyes was enough to make the heat bloom in Shouto’s cheeks. “Could you please go get a cushion for Katsuki, honey? He looks so pretty on his knees, after all,” Izuku purred, his eyes going half-lidded. Electric sparks danced up Shouto’s spine, and he quickly moved to fulfill his request.
As soon as the seat cushion was placed in the designated spot, Katsuki scrambled down from his perch, hurrying to get his promised reward. Just as clever fingers darted for Izuku’s zipper, though, they were caught and held at bay. “Hold on, baby. First, Shouchan, could you come sit behind me?”
Shouto was thrown for only a second before he fully processed the words and gladly climbed back onto the bed and wrapped himself around Izuku like clinging ivy. Izuku leaned back slightly into Shouto’s embrace with obvious appreciation. Turning his head, Izuku gave him a quick peck on the cheek that, absurdly, made Shouto blush. “Kacchan, sweetheart, could you clear your palms for me, please? Quick is good, but quiet is better.”
Izuku released his hands, and there was a gentle crackling sound as Katsuki fired off the explosive sweat that had evidently been gathering on his hands, while Izuku in turn dipped two fingers into Katsuki’s mouth, which he seemed happy to suck on.
“Honey, could you please help me with my buttons? Our hands are a bit occupied at the moment,” Izuku requested, voice tinged with amusement.
Somehow, even though they had literally just talked about it, Shouto was unprepared for how satisfying it felt to be relied on like that. An involuntary pleased noise rumbled in Shouto’s chest at the idea of finally being able to touch, and he got to work freeing Izuku’s gradually hardening cock from its confines. (And if his fingers lingered on the still-malleable warmth there as he did, well, Izuku didn’t seem to mind one bit.)
Shouto startled when, as soon as the firecracker hiss died down, he felt near-scaldingly hot hands clutch the tops of his thighs. Only a second later, Katsuki’s mouth was freed, and he darted forward, swallowing down the half-hard length that Shouto had been holding in one smooth motion. Both he and Izuku gasped at the respective stimuli, and Katsuki moaned in return, the sound only slightly muffled by the fullness of his mouth.
Izuku groaned appreciatively, throwing his head back against Shouto’s shoulder at the sudden onslaught of sensation. Needing to do Something to channel the want coursing through him, Shouto turned his attention to unfastening the row of shirt buttons above where Katsuki had nestled himself, greedily keeping the whole of Izuku between his pretty lips.
“Oh, good boy,” Izuku praised, and Shouto was genuinely unsure which of them he meant. Either way, it made his scalp tingle pleasantly, so he concentrated on getting the last of the fiddly little buttons loose.
Shouto was so focused on his task that he almost didn’t register the wet clicking noises when they started. Almost. Letting his hands go on autopilot, he leaned further over Izuku’s shoulder to investigate the source of the sound.
Below, Katsuki’s red eyes looked up at them, wet and hazy, as he visibly struggled to swallow. Izuku’s hands were firmly knotted in that spiky blond hair, holding him down. Arousal flared in Shouto at the sight, but so did concern. He knew Izuku would never intentionally do anything to hurt Katsuki, but he’d also never seen the hypercompetent boy have so much trouble swallowing, or seen him fight against Izuku’s hold like that.
Remembering that Katsuki was still clinging to his thighs and not Izuku’s, Shouto tapped Katsuki’s wrist in a silent check-in, the same way they had done for him so often. The hand that he touched immediately let go, but rather than snapping or tapping out, he clutched at Shouto’s hand with a desperate grip, the pressure tightening in time with his loud, gulping sniffs.
Shouto squeezed back, hoping it might help, and, miraculously, Katsuki seemed to relax in response, going boneless under their hold. “Good job, baby, you did so good,” Izuku crooned. “I knew you could do it, Katsuki. I’m so proud of you, baby boy, you’re amazing. Just a little longer, sweetheart, and then I’ll let you up. So Good for me, my baby, so precious.”
Katsuki sobbed at that, and the tears in his eyes finally spilled over. Shouto squeezed his hand again, and Katsuki shifted his gaze over from Izuku to him, staring straight back with a vulnerability that cut. With his free hand, Shouto reached down and, as tenderly as he could manage, thumbed the wetness from his cheek.
Katsuki closed his eyes and leaned into the touch as much as he could from his position. The trust and care in that little gesture almost broke Shouto, and he pressed his mouth to the crook of Izuku’s neck in an attempt to calm himself. Izuku leaned his jaw into him with a sympathetic noise. “It’s okay, sweet boy, I’ve got him, I promise,” he murmured soothingly.
A nameless Need rose in Shouto and, trying to sate it, he took advantage of Izuku’s open shirt to clutch at his waist with his still tear-soaked hand. The skin-to-skin contact, along with Izuku’s bulky solidity, helped, but his breath still came shakily, and the small tremors that had started in that hand spread.
The worst part was that Shouto had no idea why. He gritted his teeth against the feeling, determined not to break down for no good reason when he was needed.
Shouto wasn’t sure how long his eyes had been closed, but they blinked open at the small but insistent tugging on the hand linked with Katsuki’s. The boy in question was now peacefully mouthing at Izuku’s tip, but when Shouto let himself be pulled, he turned away briefly to kiss the back of his captured hand.
Shouto sucked in an affected breath, but Katsuki wasn’t done. He went back to his assigned task, but not before placing Shouto’s hand in his hair, right above where Izuku still held him. Izuku, in turn, shifted his hold so that Shouto’s hand fell beneath his, and their fingers slotted together in a clear gesture of support.
With that tacit permission, the tangle of mysterious emotions in Shouto’s chest finally resolved itself into a neat braid of protectiveness, longing, and loneliness that bound him tightly to the two beautiful people who had miraculously allowed him to not just witness but participate in their love-soaked rituals. His grip tightened greedily, and for some mystifying reason, both Katsuki and Izuku followed the movement without resistance.
Izuku sighed in pleasure as Katsuki took him deeper under Shouto’s guiding hand. His face turned, and Shouto felt questing lips and nipping teeth at his ear. “So good to me, love,” Izuku whispered, stroking his thumb over Shouto’s knuckle. “Make us both feel good, won’t you, baby? I know you want to. I trust you, sweet boy.”
Oh. Shouto swallowed against the lump in his throat and focused his gaze on Katsuki. He looked right back, and seeing the question in his eyes, answered with a single long blink, languid and somehow fond.
Shouto took a fortifying breath. Then, gently, he began to tug Katsuki forward with small, rocking pulses. He had no real idea what he was doing, so he leaned into intuition, building a steady rhythm under his palm.
Soon, he heard Izuku’s breath hitch, and he chased that signal as well as he could. He moved Katsuki in perfect counterpoint to the waves of tension he could feel ripple through Izuku’s abdominals, gradually growing bolder until he could hear the sound of him hitting the back of Katsuki’s throat with each thrust.
The first time he heard something like a choke, Shouto hesitated. Izuku kindly but firmly pressed on his hand in encouragement, and Katsuki moaned when Shouto resumed the pressure, pressing deeper once more. Gradually, he built confidence until he was shoving Katsuki down almost all the way on each thrust. Katsuki looked utterly blissed out under the rough treatment, and Shouto was soon feeling almost centered after that odd bout of off-balanced emotion.
…That was, until Izuku started to speak again.
“Look at you, sweetheart, so fucking pretty for me. Both of my boys are treating me so well. Feels so good, love, can’t get enough of your mouth. I’d say you’re spoiling me, but I think we both know who’s really getting spoiled here. Shouto’s being so nice to you, isn’t he, baby? Fucking your face all sweet like that, without even getting to feel my baby boy’s slutty throat,” Izuku tutted, more of that pouty mockery leaking in with every word. “Do you want to show him how Good my gorgeous, slutty baby boy can be?”
At that, Katsuki moaned loudly, his eyes rolling up in an expression of ecstasy that stole Shouto’s breath. It took all of his concentration to keep his quirk in check and not injure either of them, and he was stripped of any defense whatsoever to the arousal that pulsed through him.
“Yeah, I thought so,” Izuku said smugly. “If he’s even a little meaner to you, you’re going to come without a single touch, aren’t you, sweetheart? Do you want that?” Katsuki was in no shape to do their normal blink signals, but the way his hands balled to clutch and tug at Shouto’s pant leg and Izuku’s waistband made the answer glaringly obvious anyway.
There was no world in which Shouto wouldn’t give either of them anything they asked for, especially not like this, but he would be lying if he said that there wasn’t a delirious joy in this particular act, in being the instrument through which Izuku broke Katsuki down into his constituent parts. An odd sort of glee seized Shouto as he tightened his grip on Katsuki’s hair and shortened the strokes he was directing.
This way, his throat was clear for only moments at a time, and the pace grew more staccato. This had the delightful side effect of provoking a pleasured hiss from Izuku, his hips kicking up slightly to the new rhythm. The most wonderful part, though, was how, because Shouto was so utterly focused and attuned to Katsuki’s every small movement, he could see the moment when the wave of orgasmic pleasure hit in perfect clarity.
Shouto saw Katsuki’s already flushed face darken, his brows tense and rise, his breathing falter and choke, his lashes flutter, and his jaw slacken. Izuku must have seen it too, and when his response was to hold Katsuki still once more, as deep as he could be, Shouto followed his lead, trusting in his extensive experience not to do more than Katsuki could handle.
For a few seconds, Katsuki struggled against the hold, though he didn’t move his hands to try to signal to be let up. Eventually, he settled, slumping into their hold with glazed-over eyes. Only then did Izuku start to pull him off, and Shouto helped guide the motion as gently as he could, concerned about Katsuki not being able to breathe.
Sure enough, once he was able to, Katsuki heaved several large breaths, but he didn’t tense at all in their hold, so Shouto tentatively started to relax himself. It helped even more when Izuku bent over and scooped Katsuki up off the floor, gathering him firmly into the circle of both of their arms.
Purely out of instinct, Shouto hugged them both and used his quirk to cool the air slightly to try to help them be more comfortable. Katsuki let out a gravelly hum of appreciation at the gesture, and Izuku gave a pleased sigh as well, so Shouto congratulated himself on the good call.
After a few moments of rest, Izuku said in a hushed, careful tone, “Shouchan, love, you did so well. Could you go sit up by the pillows for me? I want to get Kacchan situated somewhere more comfortable. He’s more than earned it.” The last part was said more to the blond bundle in his arms than to Shouto, the words full of sticky-sweet fondness.
Shouto was a bit reluctant to give up the embrace even temporarily, but he saw the sense in Izuku’s words, so he scooted up toward the headboard. The movements were made a bit awkward by his unwillingness to turn his eyes away from the pair, but he managed to get settled where Izuku had indicated quickly. He was rewarded with a brilliant smile, and then even more when Izuku passed over his armful of exhausted boy for Shouto to hold.
He realized why in just a moment, because Izuku came back with a stack of cleaning rags and began to gently clean the splatter of cum off of Katsuki’s thighs and groin. Once done, Izuku situated himself to lay his full weight onto Katsuki, which also increased the pressure on Shouto’s chest in a pleasant sort of way.
Katsuki gave a heartfelt groan of pleasure at the forcible squishing, and Shouto readily concurred. Izuku let out a deep chuckle at the reactions of the two of them. “My cute boys,” he said with deep fondness.
Something about the simple declaration made Shouto feel so… small, like a child who was out of their depth being watched over by an indulgent parent. It wasn’t a bad feeling at all, though it was intensely vulnerable. Looking for something to anchor him, Shouto buried his face in Katsuki’s soft, poofy hair.
“How are you feeling, baby?” Izuku asked in a gentle tone. “Are you ready for more, or do you want to take a break?”
Rather than answer with words, Katsuki responded with what Shouto could tell, even from here, was an absolutely filthy grind against Izuku’s cock. Shouto struggled not to laugh at the bold, unspoken demand, but Izuku had no such compunctions. A loud, joyful laugh pealed from him like the chiming of a bell, melting Shouto’s heart in an instant.
“Alright, alright! Oh, baby boy, what am I going to do with you?” Izuku asked, voice slightly exasperated and soaked in fondness.
“Fuck me?” Katsuki suggested hopefully.
This time, Shouto joined Izuku in his laughter. The joke was just so… Katsuki. He didn’t seem to mind their mirth, at least, judging by the happy chirping noise he made.
Shouto knew this was only the beginning, but he took a moment to be so, so grateful that the universe had aligned in such a way to allow him all of this. To allow him to be here, with the two men he loved, in this bubble of joy. He melted into the feeling, letting it light him up from the inside.