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It’s when Luffy’s hands, clawed and dangerous and eager, start trailing towards the waistband of his soaked pants that he has to grab the other man’s- sea god, monster, merman’s- wrist. He’s fully aware- oh, god, he’s aware of how strong Luffy is, how him grabbing his wrist means nothing when he could shrug him off just as easily and carry on, but Luffy stills under his hold, lips and tongue parting from Zoro’s own as he pants wet breaths and stares down at the human in confusion.
“I was right about you not kissing soft, right?” he asks, tilting his head just a bit in a way Zoro finds endearing but would never speak aloud. “I think I was doing pretty good.”
Zoro can’t help but chuckle at his confidence, and releases Luffy’s wrist in favour of draping both arms around the merman’s neck. “You were doing amazing,” he reassures, head still floaty from the makeout session they had both oh-so-eagerly participated in. “I just-”
“Is it this?” Luffy cuts him off, rolling his hips- or whatever amounts to hips on a mermaid, anyways- against Zoro’s own, causing the older man to moan once more. “Your pants are in the way. It must be annoying, I bet, having to put on clothes all the time. You should take them off!”
Zoro flushes for more than one reason. First, there’s an attractive man on top of him telling him to get naked, but more importantly, he can feel something long and hard and… conical? nudging against his thigh when Luffy grinds down. And while he and Nami left asking questions to Usopp, he has to face this concern head-on.
“Are you gonna freak out when you see my junk,” he deadpans, and Luffy just laughs.
“I dunno! Maybe! I thought it’d be the same as mine!”
Zoro once again acknowledges the long, thick appendage grazing his thigh and thinks No, definitely not, as well as a quieter that thing won’t fit in my ass.
Luffy’s reply isn’t very reassuring, but, again- Mine. Zoro is Luffy’s, so surely, surely that wouldn’t change because of something like this. Especially not when Luffy is so eager, waiting for Zoro to make his call.
And so he does. He tries his best to shimmy out from under Luffy enough to wrangle his pants and underwear down his legs, and when he turns back from throwing them haphazardly on the docks he finds Luffy’s eyes staring at his more personal regions with curiosity.
“What’re those?” he asks, poking a clawed hand at Zoro’s balls, and Zoro instinctively tries to close his legs because fuck, ow, sharp.
“Those are my nuts, idiot,” he snaps, but then his gaze trails down Luffy’s body, angled in a way on the deck so Zoro can see everything, and oh.
He guesses it makes sense that Luffy would ask about his balls, seeing as he didn’t seem to have any- at least on the outside. He has this long… appendage, smooth tentacle, whatever emerging from a slit he had never really paid attention to on the merman- it’s pink, and it looks slimy, and once again Zoro thinks that there’s no way it’s going to fit in him, because it’s huge and girthy and his dick does not give a twitch of interest at the sight, thank you very much.
Except it does, and Luffy notices and lets out a little “woah-ho!” of excitement as he ogles Zoro’s cock like it’s an animal at a zoo. “It moved!”
“Yours is moving too, idiot,” he says, slightly embarrassed at all the staring at his own dick while simultaneously not being able to wrench his eyes away from Luffy’s. “I mean, that is yours, right?”
“Huh? Yeah,” Luffy says, perching on his elbows and looking down at himself. “That’s my dick. It’s a lot bigger than yours!”
Zoro tries not to take that as an insult- after all, it is rather big.
“Yeah, so, uh… what do you want do to now?”
Zoro winces at his own tone- he had been so confident earlier, tongue intertwining with Luffy’s on the deck underneath them, but the situation calming down had brought in an aura of awkwardness it seemed only he was feeling. Not to mention, the stinging in his side became more and more apparent as he didn’t have any distractions from the wound.
Luckily, Luffy never beat around the bush.
“We make out more!” he cheered, pumping a fist in the air and almost losing his balance because of it. “And then have sex, if Zoro wants.”
“I want,” Zoro was quick to admit, and all of a sudden he had a merman tackling him and clashing their lips together.
Luffy kissed messily, sharp teeth clinking against Zoro’s more dull ones, and his tongue explored Zoro’s mouth just as eagerly as it had been doing before they took a break. It was as if they had picked up without ever leaving off- the only difference now, though, was the little gasps and moans they let out into each other’s mouths as their erections ground against each other.
Luffy’s dick was slimy and wiggling around and for some reason Zoro didn’t find it gross- it was hot, actually, so fucking hot, and the slime helped lubricate the glide of their cocks. What a sight they must make, if anyone dared to stumble upon them- covered in blood and writhing together on the deck in the moonlight.
When Luffy’s hand nears Zoro’s hole, though, Zoro has to brush it aside yet again.
“Are we not having sex?” Luffy whines.
“We are,” Zoro breathes out with a laugh. “But you’re not putting those fucking talons up my ass. Let me do it.”
Luffy watches as Zoro slots two fingers in his mouth, getting them wet with saliva, and traces them down to his asshole. He rubs a few circles around his rim before working them in with a hiss. It’s not enough for lube, but it’ll have to do. He treats himself and lets his fingers rub over his prostate as he works himself open, and Luffy’s eyes jump between Zoro playing with his hole and the thin trail of precum slowly dripping from the other man’s cock.
“Lemme help?” he says after a bit, and Zoro is about to remind him of his claws when Luffy starts slowly dragging Zoro’s fingers out, pulling his wrist until they’re exposed to the cool air of the night once again. He takes Zoro’s hand and gently runs it up his own shaft, and he can’t help but buck eagerly into the touch.
Zoro smirks, a snide remark about patience sitting on the tip of his tongue, but Luffy pulls Zoro’s hand back from his cock and- huh.
The slimy secretion from Luffy’s own member coats Zoro’s fingers, and when he separates them a trail of it sticks between the gaps.
“Better than spit,” Luffy says proudly, and he’s right. As Zoro touches his fingers to his hole again, the slide is a lot easier than before.
They get lost in it for a while- at some point, Luffy starts kissing him again as he works himself open, giggling whenever Zoro hits a seemingly very good spot inside himself and vocalizes it, and it feels like both hours and just minutes have passed when the older man gasps and bucks his hips as the slimy appendage that functions as Luffy’s cock actually wraps around his own dick and starts to squirm around it, jerking him off slowly.
“Ohhh my god,” he moans brokenly, fingers stalling to a halt inside him because fuck, that feels good.
Luffy smiles down at him, all teeth and gums and looking like a beacon shining in the night, and Zoro decides he’s stretched himself enough.
“Get inside me,” he murmurs, looking into Luffy’s eyes as he spreads his legs more. The younger man’s eyes open in surprise, as if he wasn’t expecting the forwardness despite everything they had been doing, and he turns a spectacular shade of red.
“Okay! Okay,” he says, scrambling to align his cock into position, and Zoro can’t help but laugh (something that’s become more and more common with Luffy- laughing. He didn’t think he could laugh this much, not anymore).
When the tip of Luffy’s cock slips in and keeps pressing deeper, they let out twin groans.
“You’re all tight and warm in there,” Luffy whines, trying his best to not jerk his hips into Zoro- the older man stretched himself, sure, but Luffy was right when he said his dick was awfully big, so he didn’t want to push his luck and hurt him (in the not-fun way. Zoro seemed to like being hurt in the fun way, which was great, because Luffy liked that too).
“I feel so fucking full,” Zoro admits. “Think you went around the bend in me, not really used to that. How- how much did I get in?”
Looking down at their connected bodies, Luffy almost chokes on the sight, but he stammers out his words; “There’s only like, a bit left to get in, I think.”
Zoro lets his head flop back on the deck and he only winces a little as it collides. “Just- just fuck me slow, and we’ll see if we can make it fit.”
A smile breaks out on Luffy’s flushed face and he very happily obliges, pulling out a bit and then giving a quick thrust. He moans at the way Zoro’s hole tightens up around him, clearly not used to an intrusion this big and trying to figure out how to deal with it.
Zoro’s breathing through his nose as he grits his teeth, but with each thrust the slide gets easier and easier and thanks to Luffy’s cock secreteing it’s own DIY lubricant, there isn’t nearly as much of a sting as there would have been if Zoro had allowed Luffy to fuck him dry. Luffy asks him how he’s doing a few times, barely waiting for Zoro’s answer of “I’m good, don’t worry” to start talking about how good he’s doing, because Zoro feels so good around him, and a soft smile breaks out on Zoro’s face each time.
Eventually, Zoro gives the okay to start getting a little rougher, and something in Luffy snaps like he’s been waiting to hear it all night. He plants his hands on either side of Zoro’s head and starts fucking him rough and deep, stretching Zoro’s hole out and making the other man wail into the night.
“Oh, fuck!” Zoro moans, hands scrambling to find purchase on Luffy’s back, and the merman grins as he feels nails tear into his flesh, dragging hot lines down his skin.
“So good,” Luffy groans out, bottoming out with every thrust, the last few inches shoving their way into Zoro’s aching hole. “Zoro feels so good. Wasn’t- wasn’t sure how it’d feel, but I knew Zoro would feel so good.”
Zoro can only moan in reply- it feels like his brains are being fucked out of him via Luffy’s huge cock. There’s almost constant pressure on his prostate and he knows he won’t need to touch himself to come, not if Luffy keeps fucking him like this.
Evidently, the other man is close as well, because his hips start to stutter and lose their rhythm, but it doesn’t matter, because if Luffy’s close, Zoro’s closer.
He comes on Luffy’s cock with a wail, fingernails ripping a path through Luffy’s back once more, and the pain combined with the pleasure of Zoro’s insides tightening so sweetly around him sends Luffy over the edge as well, spilling hot cum into the other man. He keeps thrusting for a while, prolonging both of their orgasms and leaving Zoro hiccuping on sobs of overstimulation, but eventually his arms give out and he flops down on Zoro with an “oof”.
He rolls off of Zoro onto his back, and turns his head towards him. Zoro stares back, exhausted, and they both grin and start to laugh.