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It's no secret that Mario and Luigi have always been very close.
Ask anyone who even knows of them, and they’ll tell you that you’ll very rarely, if ever, see one brother without the other.
People used to call Luigi Mario's shadow due to the way he was always following his brother around, but never, not once did Luigi ever feel like he was in his brother's shadow- Mario made damn sure of that.
Any time someone teased Luigi or tried to make him feel small, Mario would be right there to shut it down and insist on how wonderful Luigi is, and how he was the lucky one for being blessed with such an amazing brother.
Whenever people would talk about them, it didn't take long for them to go from being Mario... and Luigi..., to instead being MarioAndLuigi as if together they made up a single entity.
All that was before the events that went down in the Mushroom Kingdom. If people thought they were close before, that’s nothing compared to how they are now.
It took a couple months before the brothers could even stand to be out of sight from one another.
After they saved the Mushroom Kingdom, Princess Peach asked what she could possibly to for them in order to express her gratitude.
Mario's first instinct was to say nothing. After all- what could he possibly want now that he has his brother back?
But then he really thought about it and Mario asked himself: What's the one thing that he and Luigi spent many late nights lying in Mario's bed together talking about?
The answer of course, is a little house or apartment they could share where they wouldn't have to keep up appearances for anyone.
Sure their family at least already heavily suspects that there is something more going on between them than a normal brotherly relationship.
Even so, they've always at least attempted to be discrete.
Both brothers had agreed early on that, regardless of how much they may or may not care about what other people think, they'd be better off not pushing their luck by testing just how tolerant the people around them really are.
So when Princess Peach asked Mario what she could give them, Mario told her that they wanted a house. It didn't need to be anything spectacular, just a little ways away from the main hustle and bustle of the city.
They're certainly used to the noises that come from day to day life in a busy city, what with having grown up in Manhattan, but Mario knows that Luigi can get anxious sometimes and he thought it would be good for them to be able to explore their new-found freedom a bit.
Back at home Mario and Luigi had separate beds in their shared bedroom, but in their new house in the Mushroom Kingdom they didn’t even bother, since there was no one to keep up appearances for. They'd opted instead to have one queen sized bed installed.
They were happy enough living back home with their family and they still travel back and forth fairly often to visit, but having their own private home in a world where they don’t have to pretend to be anything less than they truly are to each other has brought the brothers a level of bliss that they hadn’t even imagined was possible.
-
Mario looks up from the tv and watches as Luigi, still rubbing sleepily at his eyes, comes walking into the living room. Mario's heart swells with affection at the adorable sight that his brother makes.
Luigi’s hair is all tousled from his nap and he’s wearing one of Mario’s old t-shirts which is just large enough on him that Mario can't tell if Luigi is wearing anything underneath it.
He must have put it on after he went into the bedroom to lie down, because this is the first time that Mario is seeing him in it.
Normally, most of Mario’s clothes would be a bit short on his taller and lankier little bro, but this t-shirt is one that Mario had intentionally bought in a too-large size so he could wear it as a comfy night shirt. On Luigi, it’s just long enough to hit mid-thigh and keep his body hidden from Mario’s view.
“How was your nap?” Mario asks.
“Good.” Luigi gives him a bashful smile. “It would have been better if you were with me, though.”
Mario smiles. “Aww, I’m sorry Lu. You knew I had to help some of the toads out with something this afternoon. They built us this beautiful cottage- the least I can do is help them out with the occasional project.”
Luigi pouts and says just a touch petulantly, “They don’t need you as much as I do."
Mario chuckles and reaches a hand out. “Aww, come here baby.”
Luigi doesn't do it very often, usually preferring to let a Mario take charge, but he loves it when Luigi plays at being the bratty little brother
Rather than sitting down beside him like Mario expected, Luigi instead walks over and braces one knee on the couch so he can swing his other leg over Mario’s hips and sit down on his brother’s lap.
With Luigi straddling him like this, Mario can feel the hard line of his brother’s cock pressed against his stomach.
A familiar heat enters Mario’s eyes. “Wow, you really missed me that much, huh?” he asks teasingly.
Luigi gives his brother a weak glare that they both know he doesn’t really mean and gives a single thrust of his hips against Mario’s belly in retaliation. “Yes. I had a dream and then I woke up like this. Alone.”
“My poor baby brother” Mario coos. “Were you dreaming about me?”
Luigi rolls his eyes. “Who else would I be dreaming of?”
The matter-of-fact tone of Luigi’s voice is both so hot and sweet at the same time, that Mario has no choice but to lean forward and catch his little brother’s lips in a brief kiss.
Mario pulls back just enough to meet Luigi’s eyes with a heated look that makes Luigi shudder as a shock of want courses through him at the look.
“That’s right, of course it was me you were dreaming of.” He leans in close to speak directly into his brother’s ear with just a hint of a growl in his voice. “Because you’re mine, aren’t you Weejee?”
Mario was already well on his way to being hard, but the moan that rips its way out of his baby brother’s throat has Mario rock hard in an instant.
As if he can’t hold himself back any longer, Luigi starts grinding his hips against Mario's body and starts babbling a steady stream of “Yes! Mario, yes! I’m yours- only yours.”
Mario raises one of his hands and cups Luigi’s cheek, using the touch to gently tug Luigi forward into a longer kiss that is much more heated than the last.
It sounds like the kind of sappy stuff in the romance novels that Aunt Marie is always reading, but Mario swears that nothing tastes as sweet as Luigi’s mouth- even sleep stale as it is right now.
Mario uses his other hand to grab hold of Luigi’s hip and encourage him to continue grinding against his lap. “That’s it, take what you need from your big brother. You’re such a good boy for me.”
Luigi moans high-pitched and sweet, his eyes closed in pleasure. “Always wanna be good for you. Like making you happy.”
“You do, baby. You make me so happy. Nobody else could ever make me as happy as you do.” Luigi whines and Mario keeps speaking. “I swear you must have been made just for me- I don’t know what I would do without you, Lu.”
Luigi opens his eyes and fixes Mario with a determined look that manages to convey his seriousness despite the way Luigi is panting and how little sounds of pleasure are still escaping his throat in between words.
“Never again. We may have only been separated for a few days, but it felt like an eternity, Mario. The only thing I thought about the entire time, was you.”
Mario has to tamp down the emotion that suddenly rises in him and makes tears prick at his eyes. He gives his brother a loving look and strokes his thumb across Luigi’s cheekbone before nuzzling their noses together.
“You don’t have to think about that. I’m right here, and I’m not going anywhere.” He reaches with both hands for the hem of Luigi’s borrowed shirt.
“Let’s get you out of this, huh?”
Luigi quickly nods and lifts up just enough to allow Mario to pull the shirt up over his head. As soon as his arms are free, Luigi immediately crosses them behind Mario’s head
Mario tosses the t-shirt onto the floor and takes the opportunity to look his brother over appreciatively.
Luigi has always been quite the opposite of Mario physically. Where Mario has always been short and stocky, Luigi is tall and lanky with long legs that Mario loves to run his hands along.
He glances down at where they’re pressed together, before looking back up at Luigi with a teasing grin. “Nothing underneath, huh?”
Luigi shakes his head. “Wanted to feel your clothes against my skin. Underwear would have just gotten in the way.”
A wave of love and want, courses down Mario’s spine. “God, Luigi. Do you know how hot that is? Sometimes I wonder if you know how amazing you are.”
Both brothers had previously stilled the movement of their hips while they worked on getting Luigi undressed, but now Mario punctuates each of his next words with a hard thrust of his hips against his baby brother’s cock. “How hot, and perfect, and wonderful you are.”
There’s something incredibly arousing about having his brother naked in his lap while Mario is still fully clothed. It’s like Mario’s own pleasure is entirely secondary to making Luigi feel good, which- now that Mario thinks about it, usualy is the case- at least as far as Mario is concerned.
Luigi gasps and buries his face against Mario’s neck once more. He starts up a new bout of frantic humping, his cock grinding perfectly against his brother’s hipbone. “Please, please, Mario- please!”
“Shh,” Mario strokes the back of Luigi’s head, nails scratching lightly against his scalp. “I’ve got you, Weejee. Let your big brother take care of you.”
Both hands taking hold of Luigi’s hips, Mario starts encouraging Luigi to start grinding against him once again, hard and fast.
Face still pressed against Mario’s neck, Luigi starts letting out these keening little “Ah, ah, ah” sounds that drive Mario absolutely wild.
As if suddenly realizing how focused he's been on chasing his own pleasure, Luigi tries to snake a hand down between them to rub against Mario’s own hard length, but Mario catches his hand and sets it back on his shoulder.
Luigi makes a confused sound and Mario coos. “Nuh, uh. This is about taking care of my baby bro who missed me so much that now he’s positively desperate for it.”
Despite his teasing words, Mario knows that he's in the exact same boat- always wanting Luigi just as much as Luigi wants him.
He says it, however, because he knows it turns Luigi on when Mario acknowledges how needy Luigi is for him.
Sure enough, Luigi keens and obediently tightens his grip on the fabric covering Mario’s shoulders.
“Good boy.” Mario grins.
Reaching up and tangling the fingers on one hand in Luigi's hair, all Mario has to do is tug ever so gently on his hair for Luigi to understand what Mario wants.
Luigi obediently tips his head to the side, giving Mario room to run his nose along the sensitive skin of Luigi's neck before lightly pressing his lips against his throat.
"Maybe I should mark you up." Mario offers in a casually teasing tone. "That would be a nice reminder that you're mine for the next time we're apart."
That isn't something they've really explored before, beyond the occasional accidental mark left behind. Luigi had once mentioned liking the idea, but they never really had the chance to revisit the topic while still living in the apartment with their family.
One or both of them coming to breakfast covered in hickeys wasn't exactly something that either of them felt like having to explain.
Sure enough, the rhythm of Luigi's hips stutters for a moment and he gasps out "Please. Do it- I want you to."
Mario picks a good looking spot in the junction between his shoulder and his throat and runs his lips over the sensitive skin.
At first he just gently closes his teeth around the flesh, just enough to leave a barely-there imprint on Luigi's skin. Even so, it gives Mario a little thrill to see his mark on the other's pale skin.
He shifts to a different spot and bites down again, harder this time, and Luigi keens.
After that, Mario moves on to sucking bruises into Luigi's throat. Each one blooming red against pale skin.
He gets three good marks in before Luigi is crying out and coming, painting both his own skin and the front of Mario's shirt.
Panting, Luigi drops his forehead onto Mario's shoulder to catch his breath. Without looking, he reaches up and presses his fingers into one of the bruises on his throat.
"They don't hurt, do they?
"No. Just sensitive." Luigi sits up and meets Mario's eye with a grin. "Is it bad that I like the idea that other people are going to see these?" Mario gets a smug look on his face and Luigi laughs. "Why did I even ask?"
Now that he's caught his breath, Luigi looks down between their bodies at the still very obvious tend in Mario's pants. "Are you going to let me help with that, now?"
"Why don't you join me in the shower, and you can do whatever you want with me."
A flare of arousal jolts down Luigi's spine despite just having come.
"Deal."