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They always helped each other when it came to things about their bodies they didn’t quite understand. The unfortunate part about being so different from those around you is the lack of answers regarding your own biology. And despite being twins they never were quite the same, so they oftentimes couldn’t even find these answers in each other.
When they were much younger, they looked more or less alike. But as they grew Knives lost his baby fat faster, in the same way he was able to use his powers long before Vash. He changed in ways that made him feel different, for he no longer looked like Vash or his sisters in certain places. But Vash would assure him it was okay, even if he didn’t understand it himself.
When Vash bled for the first time and Knives didn’t, in a rare show of affection, Knives held a warm palm up against Vash’s lower stomach, somehow soothing the pain. Though Knives probably just saw it as his brotherly duty or something. But he helped as Vash did for him.
So when he finds out about this new thing, he only wants to do what they’ve always done for each other.
The sound of desert worms chirping fills the night air. They’ve set up camp by a few rocks, a small fire going to keep them warm.
“You sure you don’t want any?” Vash asks, pulling his roasted worm on a stick from the heat of the flames.
“No thanks.” Knives replies flatly. Even if being drained of powers made him have to eat more often than he used to he’d rather pass on another roasted worm… he’s had more than enough to not want to eat a single one ever again in his lifetime.
Vash takes a huge bite, making an exaggerated pleased sound.
“Mmmff ur missing out” he says with his mouth full. The taste makes him nostalgic for simpler times. Knives just rolls his eyes. It gets all over Vash’s face, some of the juices dripping down his chin.
“Could you be any messier…”
Vash takes the leftover half of his worm on a stick, shoving it in Knives' face making Knives jump back in disgust.
“150 years old and still acting like such a child…”
Vash gulps hard, swallowing his food.
“We’re 153 now silly. Is your old age finally getting to you?”
Knives simply grumbles in response.
They sit in silence for a moment as Vash finishes his meal, only for him to let out a quiet “shit…” that doesn’t end up going unnoticed by Knives.
Vash tries and fails to hide the wet spot forming on his shirt before giving up and unbuttoning it.
“Is everything okay?”
Vash sighs, a nervous itch forming on his skin.
“It’s fine, I’m fine.”
Knives raises his eyebrow.
“I um… I produce milk sometimes. You know, lactate.” Vash says soft blush forming on his cheeks frustrated by the inconvenient timing of it all.
Knives looks at him in pure shock.
“When did this start?”
“It’s not something new. I’ve been like this since I lost most of my baby fat, actually” Vash replies letting out a nervous laugh.
“Sometime after we separated then…” Knives says.
Vash lowers his gaze, eyebrows upturned.
“yup”
And probably for the better; Vash can’t imagine how stressful it would be going through this for the first time out in the desert.
“I'm sorry, I gotta-I gotta take care of it. It kind of hurts if I don’t.” Vash quickly exclaims.
Knives stares with wide eyes as Vash finishes taking off his white button-down, untucking it from his pants. The cool air hits his skin quickly. He only has one breast now; it’s not large, hardly bigger than your average pec but noticeably swollen. Knives face darkens taking in all the scars, only just now getting a full view of them after all this time. Usually, he’s only had glimpses of his torso covered by leather but now everything is on full display. His attention quickly shifts back when Vash cups the breast in his hand gently. He holds the damp shirt under his chest barely even having to squeeze for the white liquid to trickle down.
It looks painful.
“That shirt’s not even helping; it’s still getting all over you.” Knives says standing up from where he’s sitting in the sand to walk over to Vash.
“Let me help.”
Vash’s face heats up in shock as Knives sits down in front of him.
“I’ve got it, really-” Vash says through nervous laughter but Knives is already shooing Vash’s own hand away from his chest.
“Ah-Kni-”
Knives gently squeezes, only to accidentally squirt himself in the face.
Vash doesn’t know whether to laugh or shove him away in embarrassment. Knives’ tongue peeks out tasting the liquid dripping down his face, his eyes suddenly light up.
“Have you tasted it before?” he says casually.
Vash looks absolutely taken aback.
“I- maybe a long time ago but- Knives what-”
Knives starts to gently massage the breast.
It feels good, easing the ache. He gently pinches Vash’s nipple, aiming for his mouth making Vash squeak in shock.
“Okay, gross-” Vash blurts out, shoving Knives by the shoulders, but Knives doesn’t budge.
“Knivessss!” Vash angrily grumbles face going even hotter. Some of his dark spiky hair falls into his face as he attempts to push his brother off.
Knives stands up, making relief wash over Vash. But that relief is short-lived as he’s soon squatting down right behind him instead, cupping his breast again.
Vash’s lips form a thin line, not even sure how to react as Knives begins to massage it. Milk continues to leak down into the shirt that Vash is at this point gripping.
They were always quite touchy before they parted ways. But that kind of thing now was something rare and usually only ever initiated by Vash himself. Knives would clam up to any of it. He honestly found it quite funny. But right now Knives wasn’t acting that way at all. Again with his weird brotherly duty stuff. Ugh. Lord knows he never backs down from that.
Vash sighs, simply accepting defeat.
“It’s all just going to go to waste like this” Knives mutters.
Vash’s eyes widen in confusion at the sentence.
“Um, what exactly do you want me to do… feed random babies?” Vash barks back sarcastically.
“You’re expending so many valuable nutrients…”
“Well, I don’t have any plans on drinking my own milk.” Vash says flatly.
Knives' hand freezes, making Vash curiously turn his head.
Knives is once again standing up.
Vash wants to ask, “Why’d you stop?” already missing the soothing sensation but he bites his own lip stopping himself in embarrassment.
“I’m not done.”
Knives says as if reading his mind, now standing in front of him.
He squats down onto his knees, making Vash stare back at him with a puzzled look on his face. He then pushes Vash back forcefully making his back hit the soft sand, a shocked winded noise leaving his mouth.
Knives is quickly crawling over him, yanking and tossing the soaked shirt aside.
Before Vash can even register what is happening, soft lips are already on his nipple.
“KNIVES!”
Vash yells out in astonished disbelief. Okay, milking him is one thing but this is too far.
“Knives, what the HELL-”
Knives cups his breast, squeezing lightly, mouth gently sucking the pink nub. Vash feels unwanted heat pull in his belly immediately. His face grows unbearably warm, teeth bared not at all sure how to react.
Knives makes a satisfied little hum against Vash’s boob when the milk finally reaches his tongue. It’s sweet, creamy, certainly not like any milk he’s had before.
Vash can hear Knives swallowing and gulping, drinking from it like he's dying from dehydration. This is so beyond embarrassing. Perhaps that’s an understatement. This is just wrong.
I mean, he always thought Knives was a weirdo, but he never thought he’d go this far.
“Y-you gotta stop, Knives” Vash says weakly hand now pulling Knives' hair. Knives groans in response.
Vash closes his eyes with furrowed brows, waiting for Knives to unlatch himself from his chest but it doesn’t happen, the man very clearly choosing to ignore his request.
Knives gently bites the nipple, pulling it between his teeth before rolling his tongue over it and suckling again. It goes straight to Vash’s clit pulling a small gasp from his mouth.
Vash is panting at this point, overcome by the sensation. He’d never done this before, never let anyone drink his milk let alone drink from him. It felt … actually quite nice… well aside from the fact that it was his own brother. Aside from the fact that it felt a little too damn nice.
Was he purposely doing this to rile him up? What a fucking pervert. I mean this is a new feat of perverted. It’s obscene.
Knives lets his tongue slide out to lick some of the milk trickling down before sliding back up and suckling again. Vash makes a small gasping noise in response, rubbing his thighs together.
He’s certainly leaking in more places than just his chest now. Knives circles his tongue around his nipple again, and Vash sees stars.
Vash swallows hard, fingers beginning to gently pet Knives' hair. Knives feels very encouraged by this. Yes. he must be helping. He must be doing good. Knives lets out a satisfied noise letting the tip of his tongue swipe against Vash’s nipple a few times simply enjoying the texture of it.
And Vash, Vash felt as though he was losing his damn sanity. He lets out a desperate mewl, loud enough that it distracts Knives from his drinking. Knives lifts his head up with Vash’s nipple still in his mouth, teeth pulling it. He pops off with a shocked expression upon seeing Vash’s face, initially thinking he may have hurt him, only to finally take in the thick heavy scent of arousal realizing what he’s unintentionally done. Vash is so flushed mouth slightly ajar, breathing so heavy.
He stares at Vash like he’s caught in a trance. The blush forming on Knives’ face begins to reach his ears.
Vash lifts his head up, curious about the sudden halt.
“You’re done?” he asks innocently.
“I-I didn’t know-” Knives mumbles.
“What’s wrong?” Vash asks nervously.
“You’re aroused by this.”
Fuck
And he wasn’t?
Fuck. Fuck. Fuck.
Vash’s heart begins to hammer in his chest. This has to be a joke, right, this is a joke? A hysterically bad one surely. He wants to laugh when an idea suddenly pops into his head.
“Knives.”
Knives blinks.
Vash doesn’t want this to end; it’s not even his fault, he didn’t want to feel this way; Knives made him feel this way.
“You want to help me, don’t you… that’s what you were doing. I’m still leaking. Don’t you want to be a good big brother…?”
Knives’ breath hitches. He pauses for a moment before responding.
“I-is that what you want?” He gulps. Vash simply nods a yes with a small, innocent smile on his face.
Knives leans back down, about to latch onto Vash’s nipple again when Vash interrupts him.
“No- not there…”
Knives looks up at him confused only for Vash to grab the arm lying at Knives' side and move it until his hand is hovering over Vash’s damp clothed cunt.
Knives inhales sharply.
“Vash…”
When Knives finally lowers his hand, pressing against it, Vash lets out a soft sigh of relief. Fucking finally.
In truth, Knives' mind has rarely ever wandered to sex. It has simply never been at the forefront of his mind. But the idea that Vash, his sweet innocent baby brother would want something like this from him? His hand shakes as he rubs it over Vash’s cunt, movements so inexperienced.
“Your pants are just as filthy as your shirt now…” Knives comments.
“Then take them off.”
Knives' heartbeat quickens at the comment, pausing before bringing a hand to Vash’s belt buckle and fumbling with it all too nervously.
He gets them halfway down before Vash is standing up and kicking them off along with his shoes.
Knives sits up on his elbows, staring up at his brother's fully nude form above him. Vash smiles down at him before shoving Knives back with his foot making him hit the sand with a huff sound. Payback for earlier of course.
Knives did this to him; it’s only fair, it’s only fair he keeps telling himself.
He crawls on top of Knives, his leaking cunt just mere inches from his brother’s face, and he almost feels bad when he sees just how stunned Knives looks. But only almost. He’s already gone this far.
“Suck.” Vash says rubbing his little t-dick against the entrance of Knives' lips. When he hears the sound Knives makes in response he swears his brain short-circuits just a little.
Aw. He’s overwhelmed. Cute.
Vash feels his stomach practically flip when Knives finally grabs ahold of his thighs, pulling Vash’s throbbing clit into his mouth. Knives lets out a groan, eyes going slack.
“Fuck…” Vash mutters, thrusting his hips forward.
Knives’ cock twitches hard through his jeans as he begins to eagerly eat Vash out.
“Does it taste as good as my milk?” Vash boldly asks, a devious smile plastered on his face.
Knives lets out a muffled groan, thighs beginning to shake. Vash simply chuckles at the attempted response, grinding his clit even harder into Knives' mouth.
The idea of Vash with a swollen belly pops into Knives' mind. Putting that milk to good use. The mere prospect of there being more of them after everything they’ve been through… it’s terrifying but he wants it; he wants it so badly he could cry. He doesn’t deserve his beautiful baby brother…
Knives swirls his tongue around the throbbing bud in his mouth, pulling a sweet moan from Vash. He bucks his hips into the air aimlessly, imagining he’s fucking into Vash’s dripping cunt instead.
“Knives- I’m- I’m ha! Close!” Vash mutters, voice growing desperate and shaky.
Knives grips Vash’s thighs so hard it could bruise. His hips continue to buck into the air as he savors the sweet taste of Vash’s cunt.
Vash leans forward, placing his hands on the ground behind Knives' head, continuing to grind into the hot warm mouth below him. He lets out one final moan as his orgasm finally washes over him. Knives sighs against Vash’s clit, almost overstimulating it. Vash finally leans back getting a good look at Knives' messy face. His usually extremely neat hair is all out of place, and his mouth is hanging open as he pants.
God. Vash thinks. Welp, there’s no going back from this one.
He pauses with a sudden realization.
“Motherfucker…”
Knives looks up, confused.
“What am I gonna wear tomorrow…?”