An Archive of Our Own, a project of the Organization for Transformative Works
Chapters: 1/1
Fandom: おそ松さん | Osomatsu-san (Anime)
Rating: Not Rated
Warnings: Creator Chose Not To Use Archive Warnings
Characters: Matsuno Osomatsu, Chibita
Additional Tags: Omorashi, Wetting, Drinking, Alcohol, idk osos just dumb, rip my son, its rly short pls forgive me
Summary:
osomatsu pisses himself bc hes stupid and doesnt know when to put a cork in it when it comes to drinking. bye oso.
Karamatsu liked kissing Osomatsu. Be it chaste or be it passionate, any kind of kiss shared with his older brother was something that’s he’s grown to be very fond of. Not because it felt good for him (though it certainly was a bonus, and his heart never failed to thump to the beat of love when it happened) but because Osomatsu was always so happy to receive them.
Any form of physical affection from any of his brothers (but in this case, with Karamatsu) was always a welcome thing for Osomatsu. He liked to be pampered, and he liked to be showered in love and affection because he’s pretty sure that he deserves that much. Since his mother is not as doting as she used to be since he’s grown up now, he settles with satisfying his craving for touch and emotional validation from his brothers.
And Karamatsu was always, always more than ready to please.
The house is empty for once, an occasion that only happened once every blue moon, and Osomatsu is more than willing to take advantage of this opportunity. Karamatsu is, as usual, looking at himself in his hand held mirror, brushing at his bangs and trying to make them as immaculate as they could possibly be. And, as the eldest brother, it was his duty to annoy his darling little brothers whenever he had the chance to.
He stands up, walking over to Karamatsu while he’s distracted with his own reflection. He puts the tips of his fingers atop the edge of the mirror, pulling it down so he was face to face with a face that looked so much like his own. And to ruin Karamatsu’s perfectly styled hair, he leans forward and presses his lips to his younger brother’s fringe.
Before Karamatsu can even categorize this kiss as one of those chaste kisses that he loves so much, Osomatsu starts making raspberries against his forehead, getting saliva on his hair and all over his skin.
The second born is both grossed out and slightly insulted at the fact that his perfect hair has been ruined, but the situation is too funny that he can’t find it in him to get upset. “Nii-san,” he laughs, pushing at Osomatsu shoulders, snickering as Osomatsu lavishes his forehead with love and kisses and saliva. “That’s gross!”
Osomatsu has always loved the way Karamatsu laughs, and not that bullshitty cool guy chuckle of his, but the laugh that makes him sound stupid and cute. Sometimes, if you got Karamatsu to laugh really hard, he ends up snorting and snickering with barely any control. Its ridiculously adorable, even if Karamatsu finds it embarrassing.
Osomatsu trails more wet and slobbery kisses down the bridge of Karamatsu’s nose, to the tip of his nose, and then finally on his lips. Osomatsu would have liked to make out with his brother right then since they were both relaxed now but Karamatsu is still laughing, laughing against his lips and making it really difficult to slip his tongue passed his teeth.
But he isn’t annoyed. No, not at all, and he ends up laughing too because Karamatsu’s laughter is just that contagious. He pulls back, only slightly, their lips only centimeters apart. “K-karamatsu,” he snickers as he settles himself neatly in between his brother’s thighs. “Stop laughing, will ya? How am I supposed to kiss you if your— snnnnrkkkk!!!” He can’t help it now, because Karamatsu is laughing too hard, that cute snorty laugh that Osomatsu finds so endearing was something that he couldn’t help but laugh at too. “Stooop— ahaha my sidessss!!!”
Karamatsu wants to make out just as much as Osomatsu does, but Osomatsu’s laughter is so lovely and wonderful and just so full of joy and mirth, and not to mention that Osomatsu looks so handsome when he laughs. Its an expression that looks so perfectly natural on him. He tries to pick up where his brother left off though, leaning in to press his lips against his brother to initiate the kiss.
But making out is the last thing on Osomatsu’s mind now and, as Karamatsu leans in he leans back, back, back, until he’s got the floor at his back. Karamatsu, who has the tendency to close his eyes whenever he initiates kisses, ends up falling right on top of him and it’s the opportunity that Osomatsu’s been waiting for.
He wraps his arms around Karamatsu’s waist and somehow manages to flip their positions. He sits on top of Karamatsu’s stomach, his brother’s arms pinned to his sides under his legs, and he grins maliciously. “Uh ooooh~” he sing-songs teasingly, raising his fingers to wiggle them at Karamatsu.
Karamatsu gasps and shakes his head vigorously as he tries to quell his laughter. “Nooo, nii-san don’t–”
“The tickle monster is here!!” and really, more than anything, Osomatsu loves annoying his little brother’s whenever he can.
Karamatsu laughs as Osomatsu tickles him, his laughter forcing it’s way out of his body and leaving his sides sore. “S-stoooophahahahahhah!!! Nii-san!!! I give! Stop, stoop!!!! Hahahahahahha!!!”
“Neverrr!!!!” Osomatsu replies, thoroughly enjoying making Karamatsu laugh until he’s breathless.
Choromatsu finds Osomatsu later, his older brother sheepishly watching over Karamatsu who had passed out from laughing too much.
please like if you live in new york and would be able to make it to around the manhattan area for a possible osomatsu-san meetup by the end of this week !!!
honestly one of my oso hcs is that hes such a lazy, chubby little fuck that hasnt moved in over 50 years that his knees have just started destroying themselves, so hes got a ton of knee and, as a result, back problems. which prolly makes it hard for him to walk and makes him not want to do that, let alone exercise to Help his problems and it becomes a vicious cycle.
,,,and if i wanna make it gay, sometimes when the brothers are out, or if hes just alone with kara and they start hurting too bad, or the thing happens where hes just walking and a knee decides to pop out of the socket occasionally, karamatsu tends to carry him around to give him a rest and oso is very ♥ ♥ ♥ whenever he does
i have an old osomatsu ask blog i made when i first go t into the fandom n got a tablet so everything on it right now looks really bad but should i start it up again....................hmmmmmm
whenever ppl get all pissed off about oso being a bottom i get so confused bc like....yeah i can see him having dom tendencies, i guess would be the words, OUTSIDE of the bedroom but like? have u met this man? do you think he would be anything other than a big lazy baby in bed he might wanna top sometimes if that floats ur boat but damn this kid is too lazy for anything why would he wanna do that when he can sit there n barely do anything AND still get off
i should be doing the shitton of homework ive got but here i am writing this. youre welcome.
“Come over here and make me.”
Karamatsu narrowed his eyes, sighing as a vague smile found its way onto his face as he approached the other. He rolls up his hoodie sleeves, climbing onto the couch above Osomatsu and straddling him, hands moving to the man’s hips, right above where the hem of the tank top rests. “If you say so.”
The younger brother slips his thumbs beneath the pale blue fabric of his shirt, fingers brushing across the soft pudge that is Osomatsu’s stomach. Karamatsu takes one hand off briefly, pulling Osomatsu’s hand off of himself to make more room for him to duck down.
Karamatsu presses feather-light kisses all along Osomatsu’s belly, ignoring the almost childish whines coming from the eldest over having to pull his hand away from himself. Karamatsu looks up at the other, lifting a hand and shaking a finger at him. “Non, non, non, my buraza. None of that. I’ll make sure you get what you need by the end.” He flashes a wink up at Osomatsu, the older brother swinging an arm up and over his eyes as he groans.
“Ahh-! Ow, ow, ow, such a painful little brother!” Osomatsu complains, though it’s obvious there’s not much honesty behind it, as shown by the wide smile adorning his face. Karamatsu snorts lightly in response, head leaning back down to kiss up from the pouch at the very end of Osomatsu’s stomach all the way up to his chest. Osomatsu’s laughs turn into noises a bit more lewd than before, arching his back up slightly to meet up with Karamatsu’s mouth.
The moment he feels Karamatsu’s mouth catch onto one of his nipples, he lets out a rather loud and abrupt moan, arm moving from his eyes to cover his mouth the moment it comes out. Karamatsu looks up at him from chest level, grinning widely as the sound hadn’t been missed by the blue clad brother. “Do you like when I do that, niisan?” He asks, deliberately using the honorific, knowing how much it gets to the eldest brother in situations like this.
Osomatsu groans, noise muffled by the limb covering the bottom half of his face and choosing not to respond. Karamatsu raises an eyebrow at the silence, sliding one hand up to tweak the same nipple. Just as expected, Osomatsu lets out a sound, but not the one Karamatsu thought he would. Osomatsu squeaks, face turning as red as his usual hoodie. Karamatsu stares at him for a moment, before giving him an almost malicious grin. “Heh. Didn’t think I could ever work that kind of sound out of you.” He says, losing face as he’s kneed in the side by the other. “Ah! Ow! Okay, okay, I apologize!”
“Just get on with it, Shittymatsu!” Osomatsu huffs, arm sliding up to drape across his forehead as he glares at the one above him. Karamatsu obliges, leaving kisses from his chest up to his neck, hands sliding the stolen tanktop up the whole way. Osomatsu’s annoyance cools off between that time, calmness showing more clearly as he rests a hand on the back of Karamatsu’s head as he presses heavy kisses and licks to the elder brother’s neck. Karamatsu pulls back just a bit, slipping the shirt up and off of Osomatsu’s body, draping it over the side of the couch.
Karamatsu ignores his apparent victory of getting the shirt off of his brother, opting to move his kisses up to the other’s mouth, crawling up and dropping his hips down to grind against Osomatsu. Osomatsu lets out a heavy puff of breath, groaning into the other’s mouth as he presses back against his rolling hips. He moves a hand down, popping the button to Karamatsu’s unreasonably tight jeans open quickly. Karamatsu gets the hint, or the really obvious insinuation, rather, and moves one hand down to aid his brother. He tugs his own boxers down and pulls himself out, pressing it against Osomatsu’s dripping cock and holding them together in one hand.
Osomatsu sighs heavily, wrapping his arms around Karamatsu’s neck and pressing his face into his shoulder, muffling the soft whines and moans he’s making. The younger brother shakes his head, using his free hand to brush Osomatsu’s hair back, leading his head away from his shoulder. “Ah, ah. Let me hear you.”
Osomatsu squeezes his eyes shut, unwillingly letting out an even louder sound at the soft command from the other. “Mm, fuck- Karamatsu...” He thrusts his hips up, fast, into Karamatsu’s hand, forcing the other to try and match up with him.
Karamatsu hums in approval, panting as he feels himself getting closer to release thanks to the soft sounds and the face pace coming from the one beneath him, and knowing Osomatsu is right there with him, growing closer as well. “Very good. Keep going...you’re doing so well.”
Osomatsu grunts, face turning red again at the quiet praise. He feels his breath growing shallow as he nears his finish. The two move together in perfect harmony, lewd sounds emitting from the both of them as they manage to come at the same time. Though Karamatsu’s hoodie isn’t too fortunate to avoid the shot from the both of them, and neither is Osomatsu’s chest, the younger hums as he realizes his goal of keeping his favorite tanktop clean has been met. He wraps his arms around Osomatsu’s sides, the shorter brother yelping slightly as they’re flipped around. Karamatsu holds Osomatsu to his chest, letting him lay in between his legs and press his face comfortably into the younger brother’s neck.
Karamatsu hums, grinning softly as he rubs a hand over Osomatsu’s back.
“...Don’t try to ruin my shirt like this anymore, or this won’t happen again.”
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