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It’s a mistake kissing Shoto.
Katsuki had wanted to for a while and he hadn’t seen a reason not to when the three of them had been tangled together in Shoto’s bed, lost in the moment as he had been. It had been a split second decision, Katsuki pressing forward and taking what he wanted. He had made a mistake then, kissing Shoto because now he couldn’t seem to stop.
The next morning he had watched Shoto and Y/N intently, taking in how casually they touched and exchanged kisses. It was nothing different to how they usually were, Katsuki having seen them like this a hundred times before except this time he knew his advances would be welcome by both of them. He just need to get up and take what he wanted.
It hadn’t been till he and Shoto had gotten to the agency that he had finally snapped, giving into he is desires and crowded Shoto against the lockers, pressing there lips together. It hadn’t lasted that long and Shoto had barely had the time to kiss back before Katsuki was pulling away and storming from the room, yelling for the other man to hurry the hell up and trying not to think to hard about how his lips were still tingling slightly from the cold press of Shoto’s.
Things had just gotten worse from there, like a flood gate had been opened and Katsuki found himself stealing kisses from the other man at every chance he got. Shoto didn’t seem to mind though, welcoming each quick press of lips or the deeper and more demanding kisses that lasted for long minutes. There were morning kisses, sweet and chaste as they moved around each other as they got ready for the day. Then there were the kisses that came before sex, hard and demanding with hands wandering, Katsuki swallowing every little moan and gasp the other man made. It was addictive, just like it was with Y/N and Katsuki hoped he never grew bored with it.
He had thought it might have been a little strange, that maybe she might have gotten a little jealous or even thought the new development would make her a little uncomfortable but he should have known better to think he and Shoto getting intimate would ever be an issue for her. Of course she liked it, maybe a little to much but Katsuki liked that to and so did Shoto. It was nice to know she wanted, both separately and together just like they wanted her with themselves and the other.
On more than one occasion Katsuki had had Shoto pinned somewhere, the two of them exchanging kisses and getting lost in it only to pull apart and find her watching them, either amused or aroused. Sometimes even both. She would always tell them not to stop but Katsuki would just huff and reluctantly pull himself away from the other man and carry on with what he had been doing. Sometimes if he was lucky Shoto would go to her and the two of them would continue from where Katsuki had left off and that was its own different level of distracting. Katsuki liked the two of them together, of course he did and he was more than okay with just watching them move against the other.
Tonight’s not like that though.
He’s got Shoto straddling his thigh, one hand fisted in his hair and the other grabbing at his ass as they made out like a couple of horny teenagers. Shoto’s clinging to him, one hand fisted in his shirt and the other underneath the fabric and splayed across his abs, his own leg pressed between Katsuki’s spread ones. They’ve been on the sofa for what feels like ages, the two of them just kissing. Their both hard but theirs no urgency to it, the two of them just enjoying the feel of the other against them. And Katsuki is enjoying it, the way his lips are starting to tingle and the slick slide of their tongues moving together, as well as the feel of a hard body pressed against his.
It’s different to kissing Y/N. Shoto’s all hard muscles and pliant under Katsuki where she’s softer and often gives back as good as she gets. It’s different but by no means bad and Katsuki desperately wishes she was there so he could go from one to the other, experiencing both of them and enjoying it greatly. But she’s not and Katsuki is more than happy to have Shoto all to himself for once. The other man moans, rolling his hips forward and this time it’s Katsuki moaning. He pulls away from Shoto, tipping his head back against the sofa and letting the man descend on his neck, his head tipping to the side to give him better access.
Shoto’s mouth is cold against Katsuki’s warm skin and normally he hates the cold but with Shoto, like this? Well, Katsuki can’t get enough of it. His lips are soft, his tongue dragging across Katsuki’s throat like an ice cube, melting against his hot skin. Shoto’s still rocking in his lap, grinding against Katsuki’s erection and there’s not much else he can do other than tighten his hold on the other man and pull him closer.
They’ve not gone that far yet. Considering how long the three of them have been together it’s only been about a month since they first really kissed, that time his memory had been shot to hell didn’t really count and he would fight anyone who said otherwise. He wants Shoto, in many ways but he still feels like he isn’t quite ready for anything more at this point. Shoot respects that, following Katsuki’s lead but he is okay to carry on like this, acting like the teenagers they never really got to be and grinding against one another like it’s their first time.
Katsuki tugs Shoto’s face away from his neck and the mark he’s undoubtedly leaving behind. They all three like doing that, leaving behind marks to prove that their taken even if they can’t always be seen. Their all rather territorial and somehow it’s just gotten worse since they went public with their relationship.
He reclaims Shoto’s lips, muffling the other mans whine as he shoved his tongue into his mouth. Shoto’s hand slide up higher under his shirt, his hand warm and fingers twitching as his hips pick up pace. They grind against one another, kisses getting sloppy as their breathing picks up until it’s most just lips brushing as they breath in the others air. The room fills with the sound of their heavy breathing, Katsuki’s own hips twitching forward to get more friction against Shoto’s thigh.
He feels it pooling in his gut, hot and heavy as his grip tightens on Shoto’s ass, urging the duel quirked man to rut against his own thigh. Katsuki’s lips find Shoto’s again, forcing his tongue in between them and trying to muffle his own moans, feeling slightly embarrassed by the amount of noise he is making. They’ve gotten of together before but Y/Ns always been there before. It’s never just been the two of them, sat in the dark with the TV on quietly in the background. She’s always been the thing that binds them together and though it’s strange doing this without her Katsuki is rather enjoying being the sole focus for once.
It doesn’t take long for Katsuki to get there, Katsuki’s moan pressed into Shoto’s mouth as his back arches and he cums in his pants like the virgin he isn’t. Shoto tries to break away, trying to gasp for air but Katsuki doesn’t let him, hand tightening in his hair and pulling him back down to continue kissing him.
The pressure on his now softening dick is getting close to uncomfortable but Katsuki still urges Shoto on, encouraging his pace to pick up and soon enough Shoto’s falling over the edge as well. His nails dig into Katsuki’s abs, his other hand twisting in his shirt and hips stuttering and Katsuki refuses to separate their mouths, kissing Shoto through his orgasm and swearing he can almost taste it on his tongue as he swallows the groan the other man makes.
The come down is gradual, the hard and hungry kisses softening. Eventually though Katsuki allows Shoto to pull away, untangling his hand from his hair and instead placing both his hands on the other mans hips. They press their foreheads together, still breathing harder than normal but it’s starting to calm. Shoto smiles, something soft and private, something that’s only for him and Y/N and Katsuki smiles back just as softly before leaning forward and pressing a brief kiss to his lips because even now Katsuki can’t get enough.
He doesn’t know how long they sit there like that, heads pressed together and exchange the occasional chaste kiss but what he does know is that he is happy and content and was happy to stay like this for a while. Well, he would have been but his cum covered underwear is getting uncomfortable and he doesn’t want it drying and sticking to him. Shoto doesn’t take much convincing to get into the shower, the two of them just fitting into the small space. There isn’t anything sexual about sharing the shower, each of them washing their own bodies but there are kisses, the whole thing made slick with the water raining down on them but neither of them care.
They don’t sleep together, both of them heading to their own rooms because they only really share when Y/Ns there and nestled between them. Katsuki does stop him though before he can disappear into his room, cupping Shoto’s cheek and rubbing his thumb across the edge of his scar. Mismatched eyes look back at him, a soft smile on his lips again and Katsuki is leaning in before he knows it, pressing their lips together in a soft, closed mouthed kiss. It only lasts for a few seconds but Katsuki lingers before he pulls away, mumbling a quick ‘night’ before he lets Shoto go and slips into his own room, closing the door behind him. He falls into his bed with a sigh, lips still tingling and he falls asleep with a smile on his face.
When he awakes the next morning it’s to the sound of laughter that definitely doesn’t belong to Shoto and when he opens his bedroom door he finds Shoto in the same position as the night before except this time Y/N is the one under him. They both turn to look at him, the women smiling brightly and Shoto had that soft smile on his lips again. They both look happy and playful and Katsuki goes to them, drawn to them like magnets. He braces his hands on the back of the sofa, leaning down and pressing his lips against Shoto’s before pulling away and then doing the same with Y/N. It’s just as good as he had hoped, even though they were brief.
As the three of them work on breakfast, talking about work and friends they steal kisses. Y/Ns lips brush between his shoulder blades and across Shoto’s cheeks. Katsuki’s lips drag across her neck and press against Shoto’s shoulder. Shoto isn’t so subtle, briefly kissing them both on the lips whilst also trying to stay out of their way as they cook. It’s domestic, sickly sweet and so fucking perfect that Katsuki can’t believe he’s gone so long with out this.
Kissing Shoto had been a mistake, a heat of the moment thing that had just kind of happened but he didn’t regret it. Not for a second.