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All throughout their lives, the twins have avoided spending time apart from each other. Most of the time it wasn't much of a hassle, they've shared a room - and most nights, Mario's bed - ever since they were born and in school they made sure to always pick the same classes as to not be forced to spend even a couple of hours apart.
It didn't change as they got older. Mario was a social butterfly and during their teen years, he got invited to parties quite often - which he'd only attend if it was explicitly stated that Luigi was welcome as well. And even then, if Luigi didn't feel like going (which happened almost as often as the invitations themselves), they weren't going.
Luigi felt guilty about it the first couple of times. He dreaded the mere thought of having to give up the movie nights spent together cuddling in Mario's bed, but he didn't want Mario to miss out on anything because of him.
He remembers how absolutely flabbergasted Mario was the one time he brought it up. "Missing out?", he'd repeated incredulously, cupping Luigi's face between his hands and bringing their foreheads together. "I'd only be missing out if I went to a party by myself when I could be here with you."
And that was that on that. There was no Mario without Luigi, no Luigi without Mario and if you messed with Luigi, you messed with Mario. Everyone knew, and for every unfortunate new kid trying to build a reputation by calling the more timid brother names from afar or shoving him into the lockers while passing him in the hallway, Mario had two fists ready.
The longest time they've ever spent apart were the two days it took for Mario to find Luigi after entering the warp pipe for the first time - a time neither of them likes to remember. It broke something within both of them, the physical pain of their forced separation forever ingrained in their hearts.
It turned out marvelously for them in the end - they moved to the Mushroom Kingdom as beloved heroes, they now live in their own little house, just the two of them like they always dreamed of. But those many hours apart still haunt them to this day and if anything, they're even more set on staying within touching distance from each other now.
So that's what they do. They're joined at the hip so to speak, a couple of steps the farthest they're ever seen apart and never for long. It's how the people here got to know them, either leaned against each other or holding hands, always together, constantly touching.
It's refreshing to be able to show this much physical affection in public. They were never too shy about it, however it did make them the butt of many jokes. Be it from Spike or their uncles, there'd be snide comments, some more mean-spirited than others.
Mario was rarely bothered by any of it, however, it did get to Luigi at times. Especially comments referring to how he's supposed to handle future changes if he depends on Mario like this, how he'd ever cope once Mario got married - which was never going to happen but Luigi has always struggled with insecurities, so for his sake really, they had to tone it down a notch, try not to do anything to warrant thoughtless remarks like that.
None of that has to worry them in the Mushroom Kingdom. No disapproving looks, no mocking words. The Super Mario Brothers are a package deal and no one would have them any other way.
At the end of the day, no matter whether there was more or less public display of affection involved, staying together was never much of an issue.
Not much of one, but the occasional issue nonetheless.
Luigi has been trying to focus on the TV screen for the last two hours or so, the controller shaking in his trembling hands. His character keeps falling from the same cliff. Luigi can't be bothered to care but he doesn't want to turn off the console either. He at least wants the illusion of distracting himself from missing Mario.
And oh, he's missing Mario horribly. He feels empty inside except from that terrifying ache that reminds him so much of the time he's spent in Bowser's cage. The hardest part about his captivity back then wasn't the hunger, the thirst, the constant threat of lava or the physical abuse. It was always being away from Mario.
Luigi eventually does pause the game with a frustrated little sigh. Their birthday is coming up and he's willing to bet that's the reason Mario insisted on having things to do on his own. He never does anything on his own anymore and neither does Luigi. The thought alone makes him nauseous.
Luigi sets the controller aside and shifts, flinging himself into Mario's pillows. One of them could technically be described as his - Mario has two pillows because Luigi rarely sleeps in his own bed, if ever anymore.
Luigi buries his face in one of them - the one on Mario's side of the bed - with another sigh. He misses him. It's barely been two hours and it feels like an eternity of hollowness. He misses Mario so much.
He inhales deeply, Mario's scent washing over him, warming him up from the inside out. The safe familiarity of it sends a pleasant tingle all over his skin. Mario.
If Mario was here right now, Luigi would be cuddling with him instead of his pillow. Luigi nuzzles into it, imagining it to be Mario's chest instead. His scent would be so much stronger, wrapping Luigi up like a warm blanket in the night. He'd be threading his fingers through Luigi's hair, lightly scratching his scalp.
Luigi mewls at the faint memory of the sensation he's felt so many times. That in combination with Mario's scent clinging to his pillow makes his stomach heat up. He turns his face just a slightly, presses his ear against the pillow, the rhythm of Mario's heartbeat playing in his memory.
In the back of his mind, Tony and Arthur's voices are mocking him, you even get dressed by yourself or does Mario do it for ya?
He's not sure if it's an actual memory or just his own thoughts disguising themselves as his uncles' voices but either way, it makes his stomach tie itself into a knot. Usually he knows how to block out the doubts and troubling thoughts but they always get unbearably loud whenever Mario is away.
Away. Mario is away. Why isn't he back yet?
Luigi groans, trying ignore the darkness prodding at his mind. He buries his nose in Mario's pillow again and takes a deep breath, a shiver running down his spine as his scent calms him down immediately. It works like a charm every time.
It's not enough though. Mario is still very distinctly not here and everything inside Luigi recoils at being without him. Nothing feels right without Mario, he's not right without Mario.
He tries to imitate Mario's touch, runs his own fingers through his hair, down the side of his face. It's not even close to being the same thing but it's something, it eases the ache of being alone, so Luigi doesn't stop there.
He closes his eyes, caresses his own face the way Mario would. A tingle runs down his spine and he imagines lifting his head to meet Mario's gaze, Mario looking down at him with that glint in his eyes that makes Luigi weak in the knees.
He thinks about how Mario knows exactly what that look in his eyes does to Luigi, about how he would be smirking at the blush heating up Luigi's cheeks, how he'd run his thumb over Luigi's bottom lip. Your face is all red, Lu, he'd say, or at least something along those lines, his hand cupping Luigi's cheek while his thumb shifts a bit, now poking ever so slightly between Luigi's lips. Need your big brother to make it better?
This is not the direction Luigi intended for this to go. He can feel his cock starting to get hard and he groans in frustration. This makes Mario not being here so, so much more difficult. When is he coming home?
Well, no point in stopping now. Luigi shifts on his back, the pillow still pushed to the side of his face with one hand while he runs the other down his body. Mario would be using both hands but it's mostly his scent keeping Luigi going so he'll have to make due.
He closes his eyes once more, imagines Mario on top of him. There's a heat burning within his eyes that's reserved for Luigi only, an incomprehensible desire Luigi knows his own eyes mirror whenever they look at each other during these times. He imagines Mario's soft smile as he runs his hand further down Luigi's body, gentle yet teasing as it sneaks under his shirt.
He shivers when his own fingers brush his bare skin. His cock twitches inside his sweatpants and Luigi circles his hips, unconsciously seeking some sort of friction, a breathy gasp escaping him when he does.
Mario would be watching him closely, with an overwhelming intensity, like Luigi is the single most precious thing in the world. His touch would linger as he observes Luigi's every reaction, every twitch of his flesh, every breath slipping from his lips. My sweet baby brother.
Luigi moans from imagining him saying these words alone. He's still clutching the pillow against his face and he wants nothing more than to relief some of the pressure on his cock but he knows Mario wouldn't touch him there yet.
Mario would keep caressing his upper body, lightly scrape his nails down Luigi's side and back up, make Luigi's skin tingle with need. He'd lean in close to nose at his jaw before dipping his head down, lips brushing over the sensitive skin of his throat. He'd press gentle little kisses there first, humming against Luigi's skin before parting his lips, lightly sucking and nibbling, leaving marks Luigi used to have to cover with makeup (not anymore though, not here).
Luigi can only try and remember the sensation but it's enough to make him whine Mario's name against the pillow. His other hand digs into his own flesh. It's too rough, Mario wouldn't be this rough with him but Luigi can't help it, he's trembling with want.
And maybe just sometimes he wishes Mario would be a little rougher with him...
"Mario -!" He moans into the pillow, aching to pull his shirt over his head to relieve some of the heat engulfing him but he can't bring himself to give up inhaling Mario's scent for even a moment. He almost hopes Mario can hear him wherever he is, that their twin sense tells him that he needs to hurry back home, right now, right now.
Luigi's fingers brush over a nipple, like he imagines - knows - Mario's would and it makes a tiny little whimper slip from his lips. He circles his hips again, the fabric of his sweatpants teasingly rubbing against his cock and it almost makes it worse. He needs Mario so bad, where is Mario?
He circles his fingers around and around, face pressed so deeply into Mario's pillow that he's almost unable to breathe. He imagines Mario's breath hot against his skin, Mario's mustache scratching him just a little as he mouths at his neck. Want more?
"Ye-yes -!" Luigi whines to himself, eyes squeezed shut, trying his hardest to keep the illusion going. "More, Mario, please -!"
He shoves his own fingers in his mouth, pretends they're Mario's, thrusts them in and out slowly like Mario would but it's not enough, he whines against the digits, his muscles aching with need. Mario should be the one doing this, why isn't he here?
Luigi scrambles to lay on his side, face buried in Mario's pillow as he slips his hand down his pants. His face feels unbearably hot - he hasn't fingered himself in ages, there was no need - and he's anxious, he's embarrassed even though there's nobody to be embarrassed around but Luigi can't help it.
He thinks about Mario, Mario's lips at the back of his neck, one of his arms wrapped around Luigi while his other hand kneads one of his buttocks. You wanna be good for your big brother, Weegee?
Luigi nods to himself, another moan getting muffled by the pillow. "Please, big brother, please..!"
He chokes on a breath when he starts slowly circling a finger around his entrance. Goosebumps spread all over his skin. It's nice, it's good but it's not right, it should be -
"Ma-Mario..!"
He moves his finger in slow, teasing circles like Mario would, the fingers of his other hand tightly grabbing the pillow while another hand gently traces the side of his fa-!
Hold up.
That's too many hands.
"What a sight to come home to."
Luigi sits up in an instant, unconsciously hugging Mario's pillow to his chest now, his face positively burning with embarrassment. Of all the possible moments -
His over-thinking brain short-circuits when he fully realizes who he's looking at as his gaze falls upon Mario's face, the sweetest smile pulling at his lips, pupils blown wide and that glint in his eyes.
Mario is home. Mario is home.
Luigi practically throws the pillow off the bed. "Mariooo!" He makes grabby hands for his big brother, standing next to the bed, just out of reach and therefore entirely too far away.
Thankfully, Mario seems to agree. He's on the bed in one swift motion, chuckling when Luigi's arms close around him not unlike an octupus' might. His scent went from the faint memory on his pillow to so overwhelming that Luigi might pass out on the spot.
"N'awww, missed me so much, did you, Lu?"
Mario knows the answer to that question, Luigi knows the answer to that question, the entire world knows the answer to that question. And still, Luigi nods desperately, burying his face in Mario's shoulder, inhaling his scent like it's oxygen. "You took so long."
He sounds almost like a pouty child to his own ears and for a split second, he thinks about keeping the act up, play the bratty little brother and make Mario work for his affection, petty revenge for being left on his own for so long.
But Mario's hands are already on him, caressing his sides under his shirt and Luigi thinks if he breaks the physical contact between them now his heart is going to flat out stop beating.
Mario's lips brush against his temple and Luigi shivers. Mario's finally home, Mario's here, Mario's with him. "I know, Weegee, I'm really sorry."
His fingers wrap around the hem of Luigi's shirt and Luigi doesn't think twice about it, releases Mario from his death grip just long enough so he can pull both their shirts over their heads, first Luigi's, then his own.
Mario's hair looks even fluffier now, his cheeks are tinted pink and his eyes are almost glowing from the heat burning within.
Luigi holds his breath as he - like ever so often - finds himself amazed by how ridiculously handsome his brother is. His heart feels like it's doing a summersault within his chest.
Mario reaches out, his fingers closing around Luigi's chin, thumb brushing his bottom lip and Luigi thinks he's about to burst, his need, his love for Mario vibrating under his skin.
"How about I make it up to you right now?"
Luigi knew this was coming - of course he did - and still, his eyes go wide, his aching muscles relaxing immediately. He parts his lips without Mario asking him to and he can tell that it does something to him as he hisses out a breath through his teeth.
Luigi's lips close around Mario's fingers and he downright mewls again, his skin tingling all over. He wraps his fingers around Mario's wrist, albeit loosely so he's still the one setting the pace, he just needs to feel that extra bit of physical contact.
This feels right. This is how things are supposed to be.
Mario is watching him with the exact look on his face Luigi imagined earlier, highly focused, absolutely smitten and Luigi feels equal parts overjoyed and embarrassed.
He pushes it all down, focusing on the task at hand, lapping at Mario's fingers, and Mario hums with a approval, a sound that goes right to Luigi's cock.
"Eager tonight, are we?"
Luigi nods, whining against Mario's fingers, causing him to push out another shaky breath.
He leans down further, nosing at Luigi's temple. "Poor sweet Lu. Your big brother was gone and you had to play all by yourself..."
The wording makes Luigi whine again and Mario presses a kiss to his heated cheek. "Heard you say my name earlier...did you think about me, huh?"
He pulls his fingers free and as much as the loss initially makes him want to complain, the need to vanishes immediately when Mario starts working his pants down.
"A-always..!" Luigi breathes out. It's the truth, they both know it. But Mario loves hearing him say it.
"You're such a good boy, aren't you?" He pushes Luigi's knees up and Luigi's fingers curl into the bedsheets in anticipation. "I oughtta spoil you a little more."
He starts circling one of his fingers around Luigi's hole and Luigi has been aching for this so much that it almost knocks all the air from his lungs. He throws his head back with a happy little gasp, eyes closing. "Ma-Mario..!"
"I was wondering what that heat I felt in my stomach was."
Mario's circling motions stay at a slow, steady pace, massaging the outer edges of his rim. He always drags this part out and Luigi can never be certain if he's that set on ensuring that he won't hurt Luigi, or if there's an ulterior motive (like driving Luigi to the brink of absolute insanity). "It was different from the usual hollowness I feel without you -"
Luigi's heart doubles in size.
"- so I got worried. Turns out I had every reason to be."
Luigi sucks in a breath when Mario's finger starts pushing in, slowly - almost agonizingly so - moving past his rim.
"Can't have my baby brother play without me..." Mario murmurs as he leans down again, sliding his tongue over Luigi's collarbone.
Luigi can't hold in the high-pitched little moan slipping from his lips, one of his hands curling in Mario's hair, holding him close, keeping him there. He pushes down against Mario's finger, silently begging for more.
Mario's lips find his, swallowing Luigi's needy gasp when Mario adds a second finger. He's not pushing in as slowly this time but still slow enough to let Luigi adjust to the stretch.
He suddenly remembers the first time they did this. They were all clumsy hands and sloppy tongues back then, hormonal teenagers overtaken by a desire they've felt long before they even had the mental capacity to understand it.
Mario's inexperienced hands were trembling as he tried to be as gentle as he could, torn between not wanting to hurt Luigi and the all-consuming need to push and pull and take and own, while Luigi was soaking it all up, this new, exciting level of his brother's undivided attention, while trying to block out the voice inside his head constantly telling him that he didn't deserve this, didn't deserve Mario.
They've come a along way since then, know everything there is to know about each other's bodies and yet, without ever breathing a word to the other about it, they still struggle with the same things. Mario is always holding back while Luigi struggles to accept that Mario's heart belongs to him just as much as his own belongs to Mario.
Luigi whines against Mario's tongue, a jolt of electricity running down his spine when Mario's fingers spread inside his hole, working him open in earnest now. It's still so hard to convince himself that this is real, that his big brother, whom he adores so much, wants him in the same way.
Mario breaks their kiss in favor of nibbling at the underside of Luigi's jaw, causing him to breathe out a desperate little "Mario -!"
Mario's breath is hot against his skin when he exhales shakily. "Can't get enough of you saying my name like this, Lu."
Luigi's fingers are still tangled in Mario's hair and he tightens his grip, causing Mario to hiss. "Mario..!" Luigi says once more, maybe putting just a little more effort into the whine than what would be natural.
He's not entirely sure where the more or less frequent confidence to tease Mario like this comes from but he's willing to bet it has a lot to do with Mario himself. All of his confidence stems from Mario. Mario is his strength in every aspect of life.
He can feel Mario's full body shudder and is rewarded by a third finger pushing past his rim. Luigi arches his back, lips parted but no sound coming out and Mario tsks against pulse point.
"I might've been spoiling you too much actually", he whispers, not a hint of sincerity in his voice and Luigi is almost certain that he's able to feel his smirk, "you little brat."
Mario nuzzles a soft little kiss against Luigi's cheek despite his words and Luigi leans into it, not offended in the slightest but very eager to play along. "I'm not...a brat..!"
"Such a little brat."
"Nuh-uh..!"
"Bratty little boy."
Luigi's cheeks are burning, enjoying this exchange so much more than he'd ever openly admit. "You...you left me all by...by myself, you jerk..!"
"For two hours, and you take that as an excuse to be so disrespectful towards your big brother." Mario spreads all three fingers as he says this, pressing another little peck to the corner of Luigi's mouth when he whimpers. "I definitely spoil you too much."
Luigi's body is shaking all over, every inch of him silently screaming with need. He uses his grip on Mario's hair to pull him back, their noses brushing against each other as they lock equally hungry gazes. "You plan on stopping?"
Mario's reply comes immediately, his voice firm and serious. "Never."
They kiss once more and Mario starts easing his fingers out of Luigi, making him twitch, clamping down on Mario's fingers, unconsciously trying to keep him there, the idea of being left empty for even a moment almost making him nauseous. Even though he knows that he won't be empty for long.
And surely, he feels the tip of Mario's cock pressing against him and Luigi wants to scream out of relief, pressing down against his brother, causing him to slip in deeper, making him moan into Luigi's mouth.
"So impatient" Mario groans once he breaks the kiss, one of his hands gripping Luigi's hip tight enough that it's definitely going to bruise. "Impatient little brat."
He starts pushing in, Luigi's eyes rolling back in his head as he's being stretched. Nothing could ever compare to this feeling, Mario on top of him, Mario's cock inside of him, bringing them so much closer than brothers are supposed to be.
But they're not regular brothers, they're not even regular twins, they never were, they never will be. They're one soul split in half, they belong together, in every way, shape or form, even like this.
Luigi wraps his arms around Mario's neck, hugging him as tightly as his shaking limbs allow. "Mario -!"
One of Mario's hands soothingly runs down Luigi's thigh, pushing in deeper, stretching him wider, filling him up. "Fit me like a glove, don't you?"
His words are muffled thanks to Luigi downright squishing him against his body but Luigi still hears every word, whimpering desperately as he nods and Mario hums against his skin, shifting in his brother's embrace to be able to nose at the underside of his jaw.
"My sweet baby brother."
A tingle spreads over Luigi's skin. Mario has pushed all the way in now and Luigi feels so deliciously full that it makes him dizzy. "My perfect little Lu."
He pulls back before slowly pushing in again, so slow, too slow and Luigi whines out of frustration this time, pushing back against Mario's dick, trying to get him to speed it up.
Mario's breathy chuckle ghosts over his skin. "Those two hours really did a number on you, huh?"
"YES..!" Luigi breathes without even a second of hesitation, causing Mario to chuckle again, albeit somewhat apologetically nuzzling against Luigi's collar bone.
"It's gonna be worth it -"
"Doubt it..!"
Mario sighs in feigned exasperation. "It's a birthday surprise, you spoiled little princess." He emphasizes the last word with a particularly hard thrust that has Luigi seeing stars, his stomach heating up with the intensity of a thousand white hot suns.
He shakes his head though, keen on making his disapproval known. "No surprises..!"
He blindly loosens his hold and reaches for Mario's face, squishing his cheeks between trembling hands without meaning to. "No gifts, no parties, just this..!"
He leans towards his brother as much as the angle and their height difference allow, noses bumping against each other, foreheads brushing. "Just you..!"
He cracks his eyes open and is met by the gaze of a million stars, the adoration in Mario's eyes closely competing with the one Luigi feels for him.
Mario exhales sharply, closing his eyes as if completely overwhelmed. Luigi isn't sure by what. Then -
"How are you even real, Luigi?"
Mario doesn't seem to be expecting an answer because he captures Luigi's lips with his own, resuming the snapping of his hips, but faster this time, faster, harder, deeper and when he shifts just a little, repeatedly hitting his prostate, Luigi thinks he's about to shatter.
His body might as well be on fire. It feels overwhelmingly good, Luigi can't stop the many high-pitched noises slipping from his throat, muffled only by Mario's mouth against his.
He tangles both hands in Mario's hair, legs wrapped tightly around Mario's middle, urging him to keep going just like that, just like that, his own cock is aching, he's getting so close -
Mario breaks their kiss once more. And what he says next was definitely chosen deliberately because Mario knows it always does Luigi in. "Mine."
Luigi damn near cries out Mario's name as he cums, feeling himself clamping around Mario, sending him over the edge as well. He's heard it's nearly impossible for most people to reach completion at the same time. For him and Mario, it's the only way they could ever imagine their climax.
Luigi's senses are on hyperdrive. He sinks deeper into the comforting softness of the mattress under him, blanketed by Mario's weight as he slumps on top of him, their heartbeats coming down from their shared rush, beating in unison, their mingled scents enveloping them both.
It's pure bliss.
Luigi's limbs feel like cement so when Mario very suddenly starts shifting away from him, all Luigi can do is voice his disapproval in the form of a hoarse little whine.
Mario huffs out a laugh. "I'm gonna crush you, Lu." He says softly, flopping on his side next to Luigi instead, though not without wrapping an arm around his middle and pulling him closer.
Luigi supposes he gets where he's coming from. However, he's still not a big fan of the sudden loss of his warmth on top of him so he forces his limp body to move, shifting on his side as well, burying his face in the crook of Mario's neck with a little hum.
He feels Mario nuzzling into his hair, pressing featherlight little pecks to the top of his head. "Are the two hours forgiven?"
Luigi reluctantly lifts his face from the safety of his brother's neck. "This time. You're on thin ice."
Mario snorts. Luigi's eyelids feel heavy so he merely turns his head in Mario's general direction without looking. Mario understands the request, pressing his lips to Luigi's in a gentle, sleepy kiss.
If being away from Mario wasn't quite literally agonizing, Luigi would almost say the "making it up to him" part makes it worth it. He hasn't felt this relaxed and comfortable in weeks.
Mario sighs happily when they pull away, wrapping both arms around Luigi and pressing a lingering kiss to his forehead. "I love you so much."
Luigi's heart throbs and he cuddles against his big brother, safe and sound in his arms, his favorite place in the world. "I love you more."
"Really? You're gonna be a brat now?"
"I couldn't resist." Luigi admits with a little smile, nuzzling a kiss against Mario's collar bone. "I love you too, big bro."
"That's better."
He feels Mario reaching behind himself, untangling the blanket that's apparently been shoved to the side earlier. Luigi doesn't recall that happening. Then again, he barely remembers anything that's not directly related to Mario rocking his entire world mere minutes ago.
Mario pulls the blanket over them both before wrapping Luigi up in his arms again. "Night night", he murmurs into Luigi's hair, already more asleep than awake.
Luigi yawns, cuddling into his big brother like he does every night, like he did every night before that one (except the ones that will be blocked from his memory) and will every night to follow. "Night night."