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Ace has an oral fixation.
Slipping three fingers into Ace’s mouth. Feeling along the rows of his teeth, all the way back until his fingertips hit the flat tops of molars. Sabo’s middle finger presses down on his tongue while his brother’s eyelashes flutter. Half-lidded and already high on the pleasure of having something caught between his canines.
Some part of him wonders if it’s to do with their childhood environment, growing up surrounded by beasts. A latent animalistic desire to chew—gnaw on bone and flesh that just isn’t satisfied by their human diets. The wolf inside his brother wants him to render the bloody meat from prey.
Sabo can pretend to be his prey.
Or he can push his fingers back a little farther. Just enough to make Ace drool down his chin onto Sabo’s palm and wrist. To have him press closer as he begs for more through his mouth too stuffed for clear words. Only the panting and low, soft groans.
This isn’t exactly the most private place for them to be playing like this. On the couch in Ace’s room aboard the Moby, with walls not as thick as his own room in Baltigo, along with the added risk of one of his brother's subordinates knocking on the door for their commander. Sabo himself sits with his feet up on the low table in front of the couch, left hand on the arm rest, while his right is occupied, thumb and pinky holding tight on Ace’s jaw.
Ace sits prettily on the middle cushion. On his knees facing Sabo where he rests his hands in fists between them. Like a trained puppy, waiting for praise and a treat from their master.
Lost in the safe, lustful, helpless feeling that only Sabo can provide him.
It’s when his cheeks flush, eyes glassy, almost like his brother has drank too much alcohol, that he starts to grind his teeth down onto his fingers. Not enough to pierce flesh or spill blood. Sometimes Sabo wonders if that’s actually what he wants.
In the throes of sex Ace has bitten him hard on the neck and both wrists before. Leaving deep, dark indents into his flesh. Marks that lasted for days, but he was always careful never to make him bleed.
Sabo drags his fingers out slowly, feeling his knuckles scrape on every bump of his teeth. Spit strings from his mouth and falls onto his already wet chin. Ace whines, rutting his hips subtly into the empty air as his arms are not close enough to grind against, but Sabo doesn’t think his brother notices he’s even doing it. All instincts now.
Pushing his fingers back in and forcing his jaw open at the same time, Ace outright moans. It's loud in the room, but Sabo doesn’t feel the need to shush him or try to stifle any of the noises coming from his panting mouth. Sabo isn’t ashamed of his brother or their relationship, especially not in front of anyone aboard the Moby. Whitebeard nor his commanders.
They know better than to question their devotion to each other by now. It is Sabo’s responsibility to take care of Ace and his needs—his mindless pleasure.
“Ace?” Sabo watches his eyes flutter open, as he thrusts his fingers in and out of his mouth a few more times. Pressing down on his tongue exactly in the way he likes, “Would you like to sit in my lap?”
Ace bites. The vibration of his moan can be felt both inside his mouth, and where his pinky finger and thumb are pressed tight to the underside of his jaw. Sabo can’t move his hand with how hard it is being bitten between sharp teeth. Ace shudders and his hips jerk.
“Come.”
The command is accompanied by Sabo’s other hand pointing down to the space of his thighs. Ace shuffles forward on his hands and knees, not releasing his hand or letting up on his bite. There will be marks when they finish, that Sabo is sure.
With practiced ease his brother slips over into his lap. The perfect weight of his body leaning over Sabo while Ace instinctively fists the fabric of his jacket between his fingers. Sabo maneuvers his free hand around Ace’s back, dipping partially into the back of his shorts, jerking him forward so they are flush together.
Sabo doesn’t need his brother to take off his shorts for him to know how hard he is. Not with his full body shudder at the sudden pressure, or the bulge pressing against his own. Ace bites down harder, Sabo’s middle finger twitches against his tongue as his ring and pointer finger feel the sharp pain of his canines digging in.
Using his thumb and pinky to his advantage, Sabo grips tighter and pulls him closer, “Open.”
For a moment Ace just stares him in the eyes. The glassy look is still there, clearly far, far away. Jaw flexing as he blinks prettily until understanding blooms on his face. Slowly, almost reluctantly he eases his teeth apart. Sabo doesn’t take his fingers out all the way, only until his fingertips are pulling his bottom lip down. Obediently, Ace relaxes and opens wide.
“Good boy.”
Sabo rewards him by grinding their hips together hard. His darling, beautiful brother gasps, dropping his head forward and knocking their foreheads together. Letting go of his jaw briefly to flip his hand, Sabo hooks his thumb behind his front bottom teeth.
For the first time in an hour he speaks, “P-please…”
Knowing his brother inside and out helps when it comes to figuring out what he wants. Feeling rather than seeing, his tongue lick along the shape of his thumb. Sabo narrows his eyes to focus, helping guide Ace in a grinding movement that keeps him making little, half hiccuping groans. Curling his own tongue, Sabo gathers enough spit to fill the small pool within his mouth.
It’s easier to do this when they are in bed, Ace under him, open-mouthed and pliant, but Sabo is nothing if not determined.
With his thumb hooked in Ace’s mouth, he pulls his brother’s jaw forward to make him look up while tilting his own head to the side. The moment he takes his thumb out of his mouth Ace is whining, even as Sabo uses that same hand to cup his chin, not going far.
The whining only stops when Sabo seals their lips together, pushing his spit-soaked tongue into his mouth. Ace shudders in his lap, one of his fists lets go of his jacket to jerk up and wrap around the back of his neck, fingernails digging into his skin.
Much of Sabo’s spit pools into Ace’s mouth, but some slip between their lips, covering both of their chins, even as his brother tries to swallow it down.
Sabo lets his hand drop from his chin to the front of Ace’s shorts, unbuttoning and unzipping them despite the way they don’t stop grinding together. Once he manages to pull them down, to get a hand on him—Ace is leaking enough pre-cum that he doesn’t need to, but… Sabo likes to keep his brother happy.
Giving him a few pumps, making sure to get enough of his pre-cum smeared on them as he can, Sabo reaches up and shoves his pointer and middle finger into Ace’s mouth alongside his tongue.
The resulting moan sounds closer to a sob, and their rhythm stutters as Ace merely shakes like a leaf in a storm. The taste is salty, and between their mouths they lick it clean, though Sabo focuses on rubbing the flavor mainly on Ace’s tongue.
They drool excessively, drops falling from their mouths down directly onto Ace’s dick below them. Sabo takes pride in every successful jerk as each one lands. Once he can’t taste the salt anymore, Sabo moves his fingers away to go back to taking Ace in hand. Pumping him in time with the thrusts of his tongue.
Ace moves his other hand from his jacket to behind his neck and up in Sabo’s hair, gently tangling a few fingers in his curls. The fingernails digging into his neck draw pinpricks of pain that has Sabo grunting into his mouth.
It doesn’t take long.
Ace trembles, and keeps trembling as Sabo strokes him. The hand he had on his back dips further into his shorts and grips at his ass. Even as his mouth tingles from kissing so long, as his tongue gets tired from how far he’s stretched it trying to reach the back of Ace’s teeth—Sabo doesn’t stop until his brother is fiercely tugging at his hair, nearly growling inside his mouth and going stiff in his arms.
Sabo cups the head, trying his best to catch as much of the cum on his fingers and palm as he can.
Ace parts from him panting. Sabo leans away to let him breath, head tilting back until it hits the cushion of the couch, silently regarding him with half lidded eyes and a heart full of love. At some point Ace started crying, tears streaking down his face, but Sabo didn’t notice from all the moisture between their mouths. Taking his clean hand, he wipes gently under his lower lashes, not doing much besides spreading it across his cheekbone.
For a moment they sit in the room, staring into each other's eyes, while Ace comes down.
Then—Ace is gently taking his soiled hand, the one with his own cum cooling on Sabo’s fingers, lifting it up to his face. Quite unlike a feral wolf, his brother starts giving him kitten licks up the wrist, lapping up the mess with careful attention. Tickling his palm as he gets higher and higher.
It’s hot enough on its own, but the way Ace keeps glancing at him through his eyelashes with his pupils blown wide, his cheeks flushed and his lips swollen… Sabo wants to hold him down, collar him for a while—give him something else to put in his mouth. A couple of hours of cock warming would certainly please his brother and himself.
Ace is wetly licking the last bit of cum off his fingers when Sabo hears loud voices far off on the deck above, through the walls and the door. Without blood pumping against his eardrums, nor moans between them blocking the sounds of the Moby and its crew now. Neither of them pay any mind to the noise, his brother visibly relaxing into his lap.
Sabo takes care to pull his now cleaned hand away from Ace’s mouth, gingerly tucks him back into his shorts as he zips them up, and buttons them.
“Good boy,” Sabo repeats, whispering the words as he gives one last sweet kiss to the corner of his lips, feeling Ace nuzzle against him in return.
A rough, nearly silent whisper, “Thanks, Bo.”