Chapter Text
If someone had told Zoro a few weeks ago that his captain was soon to become a sex-obsessed maniac, he wouldn’t have believed it for a second. Luffy was indeed a maniac, of course, but sex had always been the last thing on his mind. That was just the way he was. But a change had indeed occurred, one that suddenly put his sexual appetite nearly on par with his actual appetite.
Zoro still didn’t know the reason for such a significant shift in Luffy’s sex drive, what it meant, or even if it meant anything at all. But he thought he had acclimated well to it. Following Luffy’s lead came naturally to him, the two of them usually on the same wavelength about everything. Luffy and Zoro clicked. And, for the most part, it had been no different for their sexual dynamic.
This was why it surprised him when Luffy’s libido began to lessen—as if he had now made up for all the lost time spent not having sex and could finally settle down. Zoro hoped this was the explanation, anyway, but the reduced frequency of their encounters had him concerned—especially on the days where he wasn’t approached for sex at all.
He began to wonder if Luffy was getting it from other people, though he brushed the notion off as ridiculous the first time it entered his mind. He would have noticed something by now.
They hadn’t stayed long at the last island they visited. It was a rainy spring island with a small settlement, but it wasn’t their true destination so they set out quickly. To Zoro’s disappointment, he and Luffy’s fantasies about outdoor sex on a comfortable summer island remained unfulfilled. And, at the rate Luffy’s interest seemed to be gradually declining, maybe they never would be.
Could he really be getting it from someone else?
The thought entered Zoro’s mind again, one night when he was on guard duty. Hunkered in the mainmast’s crow’s nest—the smaller but higher of the two—he scanned the sea’s dark horizon for potential hazards with half his focus occupied by thoughts of Luffy.
They had never actually agreed to be monogamous. Such an arrangement might not have even occurred to Luffy in the first place. And maybe Zoro shouldn’t have minded sharing, if that was what his captain needed, but there was no escaping the jealousy that took root within him as he so much as considered the idea.
He had started to keep a closer eye on him, lately, trying to determine if Luffy was behaving any differently around other members of their crew. He and Usopp had always been close, but Zoro just couldn’t imagine them hooking up. Surely Nami wouldn’t go for it, or, god forbid, Sanji. The rest of the crew seemed equally unlikely at best.
He considered Luffy’s behavior toward the villagers he had interacted with at the last island. But it hadn’t been any different than his usual, friendly-and-occasionally blunt disposition. No one had caught his eye, not even the ones that had been around their age.
Zoro knew he was being an idiot. Luffy wasn’t interested in other people like that. He never had been. As for whatever had been going on lately—it was just a phase. An experiment. Something that had held his interest for a little while, and now it didn’t.
A pair of hands snapped to the railing, Luffy’s grinning face appearing immediately after them. “Zoro!” he cried, hopping up into the crow’s nest to land seated beside his first mate. “How’s the watch going?”
“Oh it’s—it’s fine,” Zoro said, a little surprised by Luffy’s sudden appearance. He tore his gaze away and looked out across the ocean again, seeing no sign of trouble. “It’s a pretty calm night.”
“Tell me about it.” Luffy leaned back with a sigh. “I’m so bored.”
Zoro figured he knew where this was going. Luffy’s libido may have no longer been the force it once was but it hadn’t yet disappeared entirely. He might as well enjoy it while it lasted, right?
Instead of offering anything, though, Zoro glanced skyward, pretending to study the star-strewn sky and nearly full moon. He needed to ask his captain something, as unlikely as it probably was. He wasn’t sure exactly how to phrase it, so he just kept it simple: “Are you seeing other people?”
“Eh?” Luffy chirped. He gazed at Zoro in total confusion, silver moonlight reflecting in his large eyes. “What do you mean?”
“Are you fucking other people,” Zoro rephrased bluntly.
Luffy laughed. Not his shishishi little chuckle, but an outright guffaw. Zoro remained still and quiet, waiting it out. When Luffy finally noticed his worried expression, the mirthful grin dropped from his face. “Of course not,” he said, as if it was the most obvious thing in the world. His smile began to creep back in, if a little cautiously, his eyebrows knitting up in concern. “Were you worried, Zoro?”
“I guess.” Zoro felt his cheeks warm against the salty evening air. “It’s not like we…discussed any boundaries. And lately, it seems like you haven’t been wanting to do it as much.”
Luffy scooted closer, nudging his head against Zoro’s shoulder. “You were worn out.”
“I’m fine,” Zoro stressed. His heart began to beat faster in the wake of his renewed hope. Was that all it had been? Luffy just being…considerate? “I could have kept up. And with how much you seemed to enjoy it, I wasn’t expecting you to actually slow down.”
Luffy chuckled, still pressed up against Zoro’s side as if he was planning to fall asleep there. “I mean, I didn’t do it at all before this. And it’s not like it’s food. I can live without it.”
“So you really haven’t done it with anyone else?” He still didn’t know just how Luffy’s drive could go from zero to one hundred in the first place, only for him to ease off like he had. There must have been a catch. “Not even once?”
“Don’t be stupid, Zoro.” Luffy closed his eyes. “It wouldn’t be the same with anyone else.”
“I guess it’s just hard to believe you could like it that much but be satisfied with…just me.”
“Hrm.” Luffy opened his eyes again. “I guess it’s more like…” He paused, thinking over whatever it was he was about to say to make Zoro understand. “You know your swords?”
Zoro glanced at his three swords, which he had placed up against the short wall at his other side. “Um. Yeah?”
“Each one has its own scabbard, right? And it would feel wrong to mix them up? That’s like us.”
It was Zoro’s turn to laugh. “Like a sword and its scabbard, huh?”
He may not have a word for it—this specific way Luffy’s sexuality seemed to operate—but he thought he understood it a little better now. Without Zoro, Luffy would simply have no reason to have sex. He wouldn’t care. The thought made a comforting warmth bloom and spread throughout Zoro’s chest. Luffy really had latched onto him, and only him.
“Yeah,” Luffy agreed with a smile as he steadily inched closer. “See? I only want to do it with you.”
Zoro remained still as Luffy closed the distance between them. His lips were hot against Zoro’s, as were the short breaths he panted into his mouth as they kissed. Zoro then remembered his responsibility and forced him back.
“Wait,” he said, peering over Luffy’s head to check the horizon again. “I’m on lookout duty.”
Luffy flapped his hand between them, grinning. “Don’t worry. I asked Usopp to keep an eye out from the foremast.”
Zoro couldn’t argue that decision. Usopp had the best eyesight on the crew, by far. He relaxed out of his concern, lips curving into a mischievous smile as he leaned in, reclaiming the space he had just made between himself and his captain. “Alright then. Do you want me to blow you?”
Luffy was already stripping off his vest. “I have something else in mind,” he said. His upper half now bare, he pulled a small vial of lubricant from his jean shorts.
Zoro wasn’t actually expecting him to want to go all out. “Really? Up here? But I haven’t…”
“I took care of that, myself,” Luffy said, his grin eager and playful. “Zoro gets to do me tonight!”
“Oh,” Zoro’s face flooded with heat as he realized Luffy was actually willing to bottom for him. It wasn’t as if he’d ever outright refused the idea, but he’d certainly never offered before. The thought of feeling Luffy from the inside sent a pleasant shiver down Zoro’s spine, his cock growing hard in his trousers. He stole the last remnants of space between them, Luffy’s smile dropping just in time to seal their mouths in an urgent kiss.
Zoro pushed him up against the crow’s nest’s railing while Luffy helped him out of his jacket. He clawed at the back of Zoro’s shirt until the latter broke away to peel it off over his head. Then he was back between Luffy’s legs, rutting against him.
There was still too much clothing between them.
Luffy hooked his fingers under Zoro’s haramaki, his arms elongating to shuck that, as well as his pants and underwear, down to his ankles in one fell swoop. Cold air hit Zoro’s hard cock, granting him the exciting thought that he was about to stick it somewhere very warm indeed.
Luffy’s unnaturally stretched-out arms helped remove Zoro’s shoes as Zoro himself undid the button on the front of Luffy’s shorts. Zoro kicked his feet a couple times, shedding the last of his clothes. Luffy cast his shorts and sandals aside before finally removing his straw hat to place down beside Zoro’s swords.
The sea air felt suddenly arctic, way up on the mainmast with no cloud cover to speak of. Zoro brought he and Luffy’s bodies together, skin against skin. “Are you cold?” he asked his captain.
“Now that you mention it,” Luffy said with another silly smile. He wrapped his smooth legs around the larger man’s waist. “Maybe Zoro should warm me up now.”
With a deep inhale, Zoro nodded. For all the times that he and Luffy had been intimate before, he was surprisingly anxious, his heart pounding rapidly in his chest. All of a sudden, it felt new again. And all of a sudden, he was met with the same worry that he had their very first time.
What if Luffy doesn’t like it?
Luffy’s hand snaked into the space between them, finding Zoro’s cock. Zoro’s hips jerked slightly in surprise, though he could hardly pull back with Luffy’s legs locked around him. If Zoro stood up, Luffy’d be hanging upside down like a monkey. He shifted his hips closer, instead.
Luffy’s hand was cold, fingers and palm coated in the lubricant he had brought with him. “Ah, Zoro’s so excited already,” he teased as he rubbed Zoro’s cock up and down in a practiced motion. “I love how hard I make you.”
“Likewise,” Zoro said, easing his pelvis forward again. His cock pressed against Luffy’s, eliciting a soft and very adorable whimper from him. So much for all that bravado.
Zoro slid his cock up and down on Luffy’s, coaxing out a couple more moans along with a modest spill of precum. He liked that Luffy didn’t try to do anything fancy with the size and shape of his penis—even if he could theoretically make it as big as he wanted. Its natural state left nothing to be desired, at least as far as Zoro was concerned—it still took some effort for him to take it.
He wondered how well Luffy would take his, then remembered that his inhuman elasticity should make it laughably easy. Zoro wouldn’t even need to stick his fingers in first.
Now was the time, he decided, hardly able to suppress his excitement as he disengaged his cock from Luffy’s and aligned the tip to his hole.
Luffy moaned again as Zoro pushed in. As suspected, his compliant body stretched to accommodate, and the lubrication made ingress easier, still. Luffy tensed as he was filled, back arching as his head knocked against the floor of the crow’s nest.
“Zoro!” he cried, muscles tightening around the cock already half-buried inside him. “So big!”
While Luffy’s hole had been cooperative, it was still tighter than Zoro could have imagined. He gasped and willed himself to remain in control, to move slow until he was fully inside. To not brainlessly fuck into his captain like a damn wild animal. But god, even just the knowledge that he was actually inside of him was nearly enough to send Zoro over the edge.
Zoro pushed a little more, until his hips pressed flush against Luffy’s ass. He pulled out a couple inches, exhaling, then gently moved back into place. Just like that…
Luffy looked up at him, eyes half-lidded and lips breaking into a satisfied smile as he was slowly fucked. “Zoro looks like he’s found something he loves.”
“I love you, stupid,” Zoro immediately returned, unthinking.
He blushed furiously, having never before told Luffy that he loved him. It must have been obvious already, but accidentally saying it out loud made him want to pull out of his warmth and jump straight into the freezing ocean waters—the one place his captain couldn’t follow.
Luffy’s mouth fell open, his eyes wide as he stared at Zoro. He looked less surprised, more awestruck—like he was just amazed Zoro had actually said it. His smile promptly returned, teeth flashing in that familiar, playful way. “Show me,” he demanded, both of his hands sliding up to clasp at the back of Zoro’s neck. “Show me how much Zoro loves me.”
That low voice again. Zoro’s embarrassment waned as his arousal reasserted itself. He began to speed up. “As you wish, Captain,” he said, plunging his cock even deeper.
Luffy gasped, his thighs tightening around Zoro’s middle. “Ah. Zoro!”
Zoro pounded into him again and again, chasing the unparalleled ecstasy that the hot tightness of Luffy’s walls brought to his cock. His hands latched onto Zoro’s shoulders, fingernails pricking his skin as he held on tight. His lips were close to Zoro’s ear and he grew noisier with each thrust, until he had been reduced to a moaning and babbling mess of expletives and fractured sentences.
“Zo—” he cried, easing back enough to stare down his body at the place where Zoro’s considerable length repeatedly buried itself inside him. His own cock bounced erratically between them, leaving a small mess of precum on both his and Zoro’s stomachs. “Ughn. Harder! Please!”
Zoro gazed at him, at Luffy’s flushed face and teary eyes. He had never seen him this desperate, even during their most sordid encounters, his mouth open and breathless as he begged for more. It was a rush. Having the most powerful person he knew mewling beneath him, spreading his legs as wide as he could to let him in deeper, sent a thrill through Zoro’s entire body. It got him salivating. His sanity began to slip, yielding to the manic exhilaration that often overtook him when coming up against a deadly enemy.
Usually, it was the thought of fighting for his captain’s sake that turned Zoro into a ruthless demon of a swordsman. But Luffy was the one at his mercy, now. Gritting his teeth, Zoro grabbed him by the hips and slammed into him as hard as he could. Luffy’s head fell back as he made a strangled sound like he was choking while trying to scream.
Zoro thrust again, just as hard and making Luffy’s eyes roll up into his skull.
“Ah, hah,” Luffy panted. His muscles seized tight, and Zoro knew it’d only be a few more intervals before he’d lost his mind entirely. Luffy moaned, his face red and his eyes slipping closed as he succumbed to the overwhelming pleasure of being filled to the brink and relentlessly fucked.
“How’s that, Captain?” Zoro grunted, sounding unusually assertive. “Do you love having my cock inside you?”
Luffy opened his eyes again, their gazes meeting, and Zoro found his expression surprisingly lucid.
“I love you,” Luffy said.
And that was it, the last of Zoro’s cognitive functions defeated by a single phrase. He gasped, reflexively driving his cock in as deep as he could as his orgasm crashed into him. Luffy’s back arched as his insides were flooded with Zoro’s seed, and the first wave of his own climax produced a thick shot of semen that splashed onto his own, heaving chest.
Zoro kept driving into him, over and over, each thrust deliciously timed to the consecutive spurts from Luffy’s cock. The entire length of his captain’s torso had become a wet, milky mess that Zoro couldn’t wait to lick clean again.
“Zorooo,” Luffy whined, his hips bucking weakly to meet Zoro’s slowing thrusts. They had both come but it seemed neither actually wanted to stop having sex, even as Zoro’s cock turned too soft and tender to continue. For a little while longer, they grinded gently against each other in a delirious, sex-fogged daze, until their faculties returned and Zoro had the presence of mind to withdraw.
Pulling out, he leaned back and watched some of his cum dribble out of Luffy’s battered hole as it immediately contracted to its original shape—another apparent benefit of having such an elastic body. When he lowered his head and began lapping up the mess, Luffy’s thighs flexed closed around him.
“No,” Luffy whined as he tried to push him back with one hand. “Zoro doesn’t have to—ah…do that!”
Zoro moved up to his cock instead, teasing the overstimulated thing with his tongue. Luffy writhed and tossed his head to one side, eyes shut and cheeks burning bright.
Zoro kept going, licking up Luffy’s stomach and chest. “I’m trying to clean you, dummy.”
Though he was flustered, Luffy cracked a smile. He opened his eyes and turned back toward Zoro, now using his feet to try and push him away. “You know I hate baths.”
“You’re not going to want to cross the deck all covered in my cum.” Zoro dodged the prodding foot to climb further up Luffy’s body.
“No one’ll see,” Luffy insisted. “And even if they did, who cares?”
“You should care about those kinds of things.” Zoro eyed one of Luffy’s nipples, erect and streaked with a bit of ejaculate. He dipped his head down, sealing his lips around the bud and sucking.
“Ah!” Luffy gasped, grabbing Zoro’s head with both hands. “Zoro’s being mean!”
Zoro finally relented. “Heh. Alright, I’m sorry.”
Luffy pulled him back in, practically shoving Zoro’s head down into the space where his shoulder met his neck. “Besides, I don’t even want to go yet. I want to stay here.”
Despite being fairly resilient to low temperatures, Luffy was also drenched in semen and sweat. “You’re going to freeze if you stay up here for much longer,” Zoro warned.
Luffy stretched his arms out and looped them around Zoro’s back. “Put your jacket over us.”
Zoro grabbed his previously-discarded jacket, managing to toss it over them before Luffy’s overlong arms completely ensnared him. “Alright. How’s that?”
“Better,” Luffy said, snuggling closer. “Hey, Zoro?”
“Yeah?”
“Is it weird that I don’t care about sex unless it’s with you?”
“I’m not really sure,” said Zoro, adjusting the jacket a little more then settling his weight down on Luffy. “It’s not like I want to do it with anyone else, either. But…I don’t know. You really had no interest before?”
“Nope!”
“Huh.” Zoro still didn’t know what to make of that, but supposed it didn’t actually matter. Luffy thought differently, everyone already knew that. And if there wasn’t a word for what he was, then that just made him all the more special. “Well, don’t worry about it.”
“I’m not.” Luffy leaned back to smile at him. “As long as you’re okay.”
“Yeah. Sorry.”
Luffy chuckled. He eased closer and kissed him on the cheek. “Silly.”
They stayed like that for a time, Luffy’s arms coiled possessively around Zoro while Zoro’s body trapped Luffy beneath him. “Damn, it’s cold,” said Zoro, eventually. “I’m worried we’re gonna reach a winter island next.”
“Hey, did you know people from winter islands die if they go to sleep?”
“Really?” Zoro asked, almost believing it. “Wait, that can’t be true.”
“Yeah it is!”
Zoro supposed he’d seen and heard of even stranger things than that, especially since entering the Grand Line. “Well, whatever. I want to sleep. We should get down from here soon.”
Luffy drew closer, his breath hot on Zoro’s neck. “Just a little longer.”
Zoro placed a hand on the back of Luffy’s head and held him, affection stirring in his heart. “Yes, Captain,” he said, feeling warmer already.