Work Text:
In the summer, everything was fine. It was hot on Mt. Corvo, even at night.
For years, it had been just Ace and Luffy, the two of them, hunting then feasting, laughing and fighting and living, living as freely as they could.
Ace was always making fun of Luffy, calling him a wimpy crybaby. But it was obvious that Ace loved his little brother dearly. One day many years ago, Luffy had started following him and never stopped. It was like Ace had gotten his own little piece of sunshine. He would do anything to protect that sunshine, even at the cost of his own life.
But recently, something weird had started happening. A few years ago, Ace had presented as an alpha. It wasn't a surprise to him; after all he had always been aggressive and strong, itching for a fight.
Ace had always thought Luffy was going to be an alpha too. It’s not like he put much thought into it, but he’d just assumed. After all, even though Luffy was still a lot weaker than him, Ace wasn’t an idiot. He knew that Luffy could easily wipe out any kid his own age. How could he be anything else but an alpha?
But that summer, things started to become different. It started one afternoon. Like usual Ace and Luffy were tracking down some wild animal to have for dinner. It should've been a piece of cake, but the bear tracks were leading nowhere, and even deep into the evening they still hadn't seen a trace. Both of their stomachs were growling.
"Ace, I'm hungry..." Luffy complained.
Ace rolled his eyes. "If you're so hungry then try harder to catch something."
Stomach empty and head agitated, Ace suddenly caught a whiff of something. It was faint, just traces of it, faint enough to think he might've imagined it. Something sweet. But not just sweet like sugar, sweet like honey and blood, a promise of paradise.
It was mouthwatering.
Ace thought that it had to be some sort of delicious food. Maybe a dessert. He sniffed the air again, but that faint smell was gone as fast as it had appeared. He felt himself growl under his breath, agitated. He doubled down on his efforts to hunt.
He didn’t find that smell again. But he did eventually trace down the bear, after the moon had already risen. The two boys feasted, an open fire under the midnight sky.
It's a few days later when Ace smelled it again. This time, it happened while he was down by the river, washing his and Luffy's clothes in the cold water. It was quite annoying to have to do the stupid chore, but he had to since Luffy always ended up losing half their clothes in the moving water. The task was easy enough, pulling piece after piece of cloth out of the old wood box they'd used as a makeshift hamper. It was summer, so all the clothes were soaked with sweat, sitting in the heat for days. Of course it was a little smelly. Ace tried not to wrinkle his nose as he pulled his own clothes off the top of the pile.
Then it hit him, all of a sudden. That sweet smell again. Like honey and blood. He startled and looked around. There was nothing, just the quiet rustling of leaves. He looked in the old box. It was just Luffy's dirty clothes. Feeling absolutely insane, he leaned a little closer, and took a small inhale. At that moment, he felt a mix of things. Embarrassment, dread, and something else he didn't want to name. Because buried under the familiar stale sweat smell, was exactly that scent he’d been thinking about for days. It was Luffy.
Ace wasn’t an idiot, and he knew about the subgenders. He’d seen enough to know that the stereotypes are bullshit. He’d met his fair share of weak alphas, not to mention betas who, for the life of them couldn't maintain a level head. As far as Ace could tell, subgender really didn’t affect personality too much. He hadn’t seen as many omegas, since they were pretty rare, but he’d come across a few in his time. Their scents had been different, with an odd sweetness... but it had never smelled particularly good to him. It was kind of like perfume, the kind that made him wrinkle his nose and sneeze.
So he’d never thought much of it; didn’t care too much about being an alpha either.
But that day, all of that flipped upside down.
It just took one faint whiff and suddenly, everything shifted in Ace’s mind. His body reacted before his head, pierced through with fire, a violent wave of want washing over him. So that’s why the other omegas had smelled strange and unappealing. Because it wasn’t this . With this being…
Ace couldn’t even admit it to himself. That he was suddenly overwhelmed by the scent of Luffy . That Luffy was an omega. And fuck, he hadn’t even presented yet. This was just a faint tease, lingering on his clothes, of what he’d bloom into soon.
Ace was absolutely fucked.
Recently, Luffy had started feeling weird. It was summer, so of course it was hot. But he was feeling more hot than usual, sweating more, even getting light headed. It wasn’t normal, but he’d never been sick before. Even though it was hard, he tried to push through, because if he wanted to be the pirate king when he grew up, he couldn’t let something like this bring him down.
He noticed that he felt better when he was with Ace. Luffy’s head cleared and his body cooled down when Ace was around. It was especially comforting to smell Ace’s scent. Ever since his big brother had presented as an alpha Luffy had really liked how he smelled.
The problem was that it seemed like Ace was starting to avoid him more and more. In the morning when he woke up, sometimes Ace would already be gone and he’d have to follow his nose and Ace’s footprints all day to find him.
When they ate meals together, Luffy would sit down next to Ace, but Ace would quickly find some excuse to get up or to sit somewhere else. At night, Luffy had a habit of crawling over to Ace and laying next to him. He’d been doing it for years. Usually, Ace would push him away a few times but eventually let up. But now, Ace would get mad and unceremoniously dump Luffy on the other side of the hideout. Once, he even got up and disappeared into the woods, claiming he needed to go for a walk.
All this left Luffy feeling confused and lonely. And of course it didn’t help that he was feeling more sick and feverish by the day.
Unbeknownst to Luffy, his scent was getting sweeter and stronger by the day and driving Ace insane. Ace was scared that if he didn’t proactively keep his distance, he’d wind up doing something he’d regret. Luffy’s sweet omega smell awoke some deep seated need inside of him.
At first he just wanted to maybe hold Luffy and close and bury his nose in Luffy’s scent gland. That wasn’t all too bad, and he even thought about doing it. But all too quickly his body started having other ideas. He’d wake up in a cold sweat with a painful hard on, with the hazy recollection of a dream that involved Luffy’s smaller and weaker body pinned underneath his own. He was no idiot, he knew what sex was. And he knew that doing that to Luffy was more than out of the question. If Luffy really was an omega (and at this point it was painfully obvious that he was), Ace was supposed to be the one protecting Luffy from alphas with bad intentions. It was pretty ironic that the only bad alpha around ended up being himself.
“Ace, I feel hot…” Luffy complained that night. The full moon cast a calm blanket over the forest. To Ace it felt stifling. He knew that Luffy was probably going to present that night or the next day. His smell was getting so ripe and he was starting to show physical signs of fever and heat, his skin giving off a pinkish glow and glistening with sweat.
“Just go to sleep,” Ace said. He sounded annoyed and it made Luffy feel sad and rejected. Ace had been so cold to him recently. Usually when he got hurt Ace would take care of him. Luffy wondered if it was because he was getting too old, and Ace was annoyed that he was still weak and dependent on his big brother. Luffy had been trying to push through whatever sickness he was getting, but it just kept getting worse by the day. His thoughts were a mess. Eventually Luffy fell into a fitful sleep.
Ace waited up until he heard the sound of Luffy’s snores. He looked over at the smaller boy’s sleeping figure. Since it was so hot, Luffy didn’t bother with a blanket. He was lying on his stomach with his arms folded under his head. He looked so sweet and innocent like that with his soft black hair flopping into his face. Even though he was still quite skinny, Luffy wasn’t the awkward looking kid he used to be. His muscles had become toned and he was fit, his form overflowing with youthful energy. Ace was so fond of Luffy that it made his heart ache. He’d rather die than let Luffy find out that he was secretly harboring bad desires toward the boy. Luffy would lose trust and faith in him as an older brother. He would look at Ace with disgust and suspicion instead of love and admiration. It would be the end of Ace’s world.
So Ace did the only thing that he could think of doing: He ran.
Making sure not to disturb Luffy’s slumber, he crept out of the treehouse, and ventured far away, deep into the mountain until he was sure he wouldn’t change his mind and go back.
When Luffy woke up the sun was already high in the sky. Immediately he could tell something was wrong. His body was on fire and his muscles ached. His mind felt foggy and when he opened his eyes, his vision was hazy and made him feel sick. When he sat up, he realized that he was sitting in a puddle. Shocked, he thought he must have wet himself in his sleep. But then when he shifted a little more he realized that the liquid had come out of a different place. It had come out of his backside! He was mortified and didn’t understanding what was happening. He wanted to ask Ace but when he looked around it was obvious that Ace wasn’t there.
Luffy wasn’t surprised since Ace had been avoiding him recently. But today he felt like his heart was gonna split in two. He wanted to see his big brother so bad. He needed to grab Ace around the waist and drown in Ace’s scent. Luffy remembers the day that Ace had presented as an alpha a few years ago. Ace didn't care but Luffy remembers being obsessed with sticking his nose in Ace’s scent gland. It was addicting and made him feel safe.
There was still a trace of Ace in the air of the hideout. Subconsciously Luffy’s body took him in the direction of the place where Ace usually slept, and he saw that Ace’s blanket was lying on the floor. Luffy grabbed it and bunched it up, hugging it to his chest. When he pressed his nose into the fabric it almost felt like he had Ace right there with him.
After a few deep inhales, Luffy felt his heart ache ease a little bit. And his mind cleared up a little, too. On wobbly legs, Luffy got to his feet, still hugging the blanket to his chest. His shorts and the backs of his legs were totally coated in that weird liquid. Wrinkling his nose, he shed his clothes and looked for something else to put on. He didn’t have any other pants but he changed into a different set of underwear. Then he put on one of Ace’s shirts. It was a plain t-shirt that was a little big on him and went down to just below his bum. Even though it was washed it still had traces of Ace’s scent on it so it made Luffy feel better to wear it.
Usually when Luffy woke up, his stomach would immediately start growling and he’d have a one-track mind to find food. Today, he felt so sick that he wasn’t even hungry. But he figured he would need to eat anyways. So he climbed down from the hideout and started walking into the woods.
Even though he had decided he would look for food, Luffy was really just looking for Ace. There weren’t any footprints and he couldn’t smell Ace’s scent in the air. Ace must have left in the middle of the night, a long time before Luffy had woken up.
“Ace!!” Luffy called out. His voice sounded weak and thin to his own ears. “Ace, help me!! I’m sick!!”
Luffy felt so pathetic. He started to wonder if Ace had abandoned him for being a burden. After all Ace always said he was weak. Ace was so strong; so much stronger than him. But despite all of that Ace had been by his side all these years and even became brothers with him. Luffy swallowed down tears, trying to keep a strong front on.
He walked deeper and deeper in the forest, calling out for Ace. Eventually the trees around him became unfamiliar and he realized he was totally lost. But still he kept going further. Luffy was sweating bullets and soon Ace’s shirt that he was wearing became drenched in his sweat, drowning out the fragments of Ace’s smell on them. Luffy felt more and more light-headed and hopeless.
Soon it became difficult to walk and Luffy was dragging his feet. What was worse, that liquid started to come out of him again, in random spurts while he walked, until his underwear was soaked through yet again and it started running down his legs. It smelled funny and made Luffy feel so embarrassed. Even if he did find Ace what would he say?
Eventually he couldn’t go on anymore and found a crevice between some big tree roots to sit down under. It was cool and shady in there and made him feel a little better. He hugged his knees to his chest and waited.
Ace didn’t sleep a wink that night. Instead he just kept walking around aimlessly, trying to clear his head. What the hell was he supposed to do? He kept imagining different scenarios: of him forcing himself on a confused Luffy, of Luffy becoming scared of him, hating him, and leaving him forever. He couldn’t let that happen. Even if he killed himself he couldn’t violate Luffy.
Ace kept walking all night until the sky started to lighten, and even as the sun replaced the moon he didn’t stop. At one point he started to wonder what Luffy was doing. He was sure that Luffy would be full on in his first heat by now.
Ace had never seen an omega in heat, so he didn’t know what exactly that meant. He remembered when he had his first rut. He had felt hot and sweaty and kind of angry. He remembered wanting to fight and kill somebody. At that time, Luffy had been confused but had tagged along happily as Ace sought out beasts to slaughter and eventually even went into town to beat down some hapless crooks. No matter what, Ace hadn’t been able to feel satisfied, and eventually they'd gone back home. Luffy had wiped Ace’s forehead and brought him water, never leaving his side. Even though Luffy’s care was sloppy, and it made Ace feel like an idiot to be dependent on a younger kid, it had secretly made his heart content to have Luffy around. It didn’t take long before he had recovered.
If Luffy’s heat was anything like that… Ace stopped in his tracks.
All of a sudden, Ace couldn’t believe himself. He was such a damn coward! Right now, Luffy must be feeling sick and strange and confused, going through a new experience all by himself. And what had Ace done? He’d gone and completely abandoned Luffy.
Luffy could be hurting, all alone, up in their hideout. What if some alpha from the gray terminal came this way and caught a whiff of that unbelievably tantalizing scent…
That was enough to spur Ace into action. Just the thought of another alpha touching Luffy made a murderous light flash through Ace’s eyes. He had to go back. He had to find Luffy, he had to protect him… Ace turned around and sprinted in the opposite direction, as fast as his feet could take him.
Out of breath and panting, Ace finally made it to the clearing where their hideout was. He scrambled up the ladder at an inhuman speed. But he was only met with disappointment as he realized that it was empty. Luffy was nowhere to be seen. Fuck.
The past few days, every time Ace tried to run away, Luffy would follow after him and try to find him. Oh no. Had Luffy gone out by himself in his current state? Ace hoped that Luffy wasn’t looking for him. Luffy was such an idiot! But Ace knew that he himself was the biggest idiot of all.
“Luffy!!” Ace shouted at the top of his lungs as he sprinted back into the woods. At this point, it was well into the afternoon, and the sun was already starting to fall in the sky. Luffy could be anywhere. Ace was filled with dread and anxiety as he rushed blindly through the undergrowth, searching for Luffy. He couldn’t let Luffy be alone. He had to find him, no matter what it took.
Luffy couldn’t stop shivering, even though he was hot and sweaty. He knew he had to get up in order to find Ace, but his body wouldn’t listen to him. All his muscles hurt so bad. He felt weak and he couldn’t think clearly. All he could do was hug his knees to his chest with his eyes leaking tears. To comfort himself he had pulled all the leaves from nearby on the forest floor and made a little nest around himself.
Maybe a miracle would happen and Ace would find him. He’ll find me, Luffy thought to himself. Ace always saved him after all. In his eyes, Ace could do anything. Luffy pictured it in his mind. Ace would come and Luffy would grab on and never ever ever let go and bury his nose in Ace’s chest and breathe in forever until everything was okay.
Another tear fell from Luffy’s eyes, and Luffy wiped it away furiously. He didn’t want to cry, but he was so scared. Part of him was sure Ace would find him, but another part was sure that Ace had abandoned him forever. What if he got so sick that he died here, without ever seeing Ace again? Luffy shook his head furiously, trying to clear his mind of the thought. No way. Ace would definitely come!
But as the sun fell further and further from its zenith, Luffy’s hope got colder and colder. At this point, his eyes were red from crying and his hair was matted. His body was covered in dirt and he felt gross. His legs and backside were sticky and he was sweaty everywhere. He was hot and cold at the same time. His stomach had finally started growling too. The sun was going to set soon and he felt terrible.
And then that’s when he heard it.
At first he was sure he was just light headed and imagining things. But after the second and third shout, getting louder each time, Luffy perked up. His eyes welled up with tears yet again, but this time for a different reason. A small, hopeful grin broke out across his features. He managed to get onto his hands and knees and crawl slowly out into the open.
“Luffy!!” Ace shouted, looking desperately around him. The sun was going to set soon and he still hadn’t found Luffy. Panic started to set in. But just as he was starting to imagine worst case scenarios, he suddenly stood pin straight, eyes wide.
His nose twitched. That was it. Finally, he picked up on it! It was unmistakably Luffy’s scent.
With renewed vigor, Ace ran forwards, yelling Luffy’s name as loud as he could. He followed his nose, chasing the sweetness that got stronger with each step. As he got closer other signals also became clear through the scent. Distress, fear, need. He didn’t know how he could tell, but his instincts knew. Those edges of desperation made him feel mad with need. The need to see Luffy and protect him. And a need to claim him and fill him with so much love that nobody else would ever even think about looking his way.
“Luffy!! Where are you?!”
“A-Ace!”
Ace gasped as he heard the weak voice coming from somewhere to his left.
“Luffy!!” Ace ran so desperately that he tripped over a root and went flying, sprawling painfully onto his stomach. Getting his clothes and his limbs all dirty and scraped up. But barely could tell.
Because when he looked up, just feet away in front of him, was the small and teary-eyed Luffy, crawling weakly towards him.
Ace couldn’t help but break into a huge and relieved grin. “Luffy, I found you…”
“ACE!!” Luffy screamed, looking like he couldn’t believe his eyes. His expression was full of wonder and joy. He instantly started sobbing. “Ace, I thought you left me… I’m so glad to see you…”
Ace felt guilt well up in his chest at those words. “Luffy, I’m so sorry,” he said as he rushed over. Without thinking, he gathered Luffy up into his arms. Kneeling on the ground, he pulled Luffy against his chest and rested his chin on top of Luffy’s head. “I’m here, I’m sorry…”
Luffy made a happy noise and burrowed his face into Ace’s chest. It didn’t matter that Ace had just taken a tumble and was covered in dirt. In fact Luffy was a lot worse. With Ace right here and hugging him, it was like all of Luffy’s sickness had gone away. He didn’t feel light headed anymore and his body didn’t hurt anymore. He felt a wave of ease and safety.
Ace had been so relieved to see Luffy that he just acted on instinct and pulled the younger boy into his arms. But that was a mistake. Ever since Luffy had started showing hints of his new scent several days ago, Ace had been avoiding close physical contact like the plague in order to control himself. If the scent from back then was like a single drop of water, then right now, Ace was drenched under a waterfall. Luffy’s overpowering heat pheromones flooded the air and poured into Ace’s body. In an instant, his veins were shot full of need and desire. His inner alpha felt like a mad dog. He couldn’t help but grip Luffy tighter, his fingers digging into Luffy’s soft flesh possessively.
“A-Ace?” Luffy gasped, sounding confused. Ace was hugging him really tight, making it hard to breathe properly.
“Sorry,” Ace said, but his arms didn’t loosen at all.
Luffy started to squirm in his grasp, causing Ace to finally loosen his grip a little. Luffy looked up at him with big eyes. “Ace, let me…” A cute blush spread across Luffy’s cheeks, and he looked away. “Can I…”
Instead of finishing the sentence, Luffy pulled his arms loose and wrapped them around Ace’s shoulders. Then he pulled himself up until his face was buried in Ace’s neck. He settled his legs on either side of Ace so that he was straddling him. The position was a little suggestive but Luffy didn’t think about such things. He just wanted to inhale Ace. He had been so lonely and hurt all day. Now that Ace was here he didn’t want to hold back at all.
“Ace, you smell so good…” Luffy mumbled into Ace’s neck.
Suddenly, Ace noticed something. He was kneeling on the ground with Luffy straddling his lap. So Luffy’s bum was right on his thighs. And after a minute, it was unmistakable that his thighs were getting wet.
The realization made a jolt go through Ace’s spine. Right. Luffy was an omega, so he was leaking, leaking there , and… Ah! He didn’t want to even let himself think about it. But it was right there, right on top of him…
Ace realized with horror that he was starting to get hard. Oh no, not now, not here… He wanted it to go away so badly, but it was too late. He could only pray that Luffy wouldn’t notice. But who was he kidding? Luffy was sitting right on his lap, over his dick. Of course Luffy would feel it. There was only one thing he could do. Ace was about to push Luffy off when he suddenly froze, shocked.
Luffy had just moved his hips. Like, in a way that felt like he was grinding on him. No fucking way, no way, no — And then Luffy did it again, pushing himself against Ace’s growing hard on. At the same time, he made a happy, satisfied little noise into Ace’s neck.
“L-Luffy? What are you doing?” Ace was too scared to move.
“Ace,” Luffy breathed. “Ah…” He moved his hips again.
“Luffy!” Ace said again, this time closer to a shout. “Stop it!!”
That seemed to get Luffy’s attention. He pulled back, biting his lip. His face was so flushed, his eyes dilated. It made Ace’s heart ache. Luffy looked nervous. “Ace…” he says again.
It took all of Ace’s human strength, but he manageg to extract himself from underneath Luffy, putting an arms length of distance between them. Within seconds, Luffy’s scent became distressed again.
“Luffy, you know you can’t… do that ,” Ace said. He tried to sound calm, but his voice cracked.
“Do… do what?” Luffy asked, cocking his head to the side.
“Y’know.”
Luffy furrowed his brows, thinking hard. Finally, he sighed loudly and his shoulders drooped. “But Ace, it hurts.”
Ace contemplated his next words. “What… hurts, Luffy?”
“Everything. I told you, I’m sick. Is that why, cuz you don’t wanna get sick?”
Ace scratched his head. “No, it’s not that, Luffy. You’re not gonna… make me sick.”
“Well, that’s good,” Luffy said. But he still looked a little upset. “Ace, do you hate me? Why do you keep running away from me?”
Ace hesitated. Of course he wanted to console Luffy. But how the hell could he explain the truth? Sorry, I kept having dreams about fucking you even though you’re my little brother. Like hell he would ever admit that!
“Ace, even if you hate me, I… I need you right now,” Luffy said in a small voice. “I dunno why but I can tell. You’re the only one who can help me.”
“How… do you want me to help you?” Ace found himself saying.
Luffy bit his lip, then inched closer. He looked nervous again, staring down at the ground. “I wanna… I know this is weird, but I just wanna. Hug you and stuff.”
Ace’s heart hurt. It was so unfair that this sweet and innocent boy had to go through something like this. It wasn’t fair that Luffy had to grow up. Ace wished he could make it better. Well, there was nothing wrong with cuddling a bit with Luffy. It was nothing they hadn’t done before.
If that was all that they did, Ace had no problem with that. So after a few moments, he agreed. “Fine. Just don’t … do anything weird, okay?”
“Okay…” Luffy mumbled, looking a little embarrassed. Ace felt like such a hypocrite. If anyone was gonna do something weird, it was probably him. But it was better safe than sorry.
“Come here then,” Ace said with what he hoped was a reassuring smile. They ended up with Ace leaning back against the big tree, and Luffy sitting sideways across his lap with his head on Ace’s shoulder and his face in Ace’s neck. Ace held Luffy’s waist with one arm and rubbed up and down his back with the other. He tried to find a position where Luffy wouldn’t be able to feel his dick getting hard.
Luffy had his arms around Ace and happily burrowed into Ace’s neck. Finally he felt his heart start to heal. He didn’t really get why but he just wanted to be closer and closer to Ace. He thought that it would be all okay if he could be held like this and fill his lungs with Ace’s calming scent.
But as he sat there, the initial relief started to fade. Instead, it was replaced with a unexplainable need. A need to get even closer. But Luffy didn’t understand how that was even possible. It felt like an itch in a place that was impossible to scratch. He made a little sound of frustration in his throat.
Hearing Luffy's agitation, Ace was concerned and turned his head towards Luffy. At the same time, Luffy decided to look up towards him. They both froze in shock. Because they both moved at the same time, they had accidentally brushed together. With their lips.
Ace quickly turned his head away, mumbling an apology. Trying to ignore how sweet and soft Luffy had felt. Even though it was the briefest taste, his inner alpha wanted more, to eat Luffy right up.
Meanwhile, Luffy’s eyes were blown wide. He brought his fingers to his lips. Unlike Ace, who was desperately trying to control himself, Luffy didn’t understand anything he was feeling. It was like a big new adventure for him. As soon as their lips had brushed, Luffy realized that was what he had been craving, that was how he wanted to get even closer to Ace. His heart was hammering in his chest. He had seen grown-ups kiss before but it was always weird and gross to him. He had no idea that this was what it felt like. He wanted more.
“Ace?” Luffy asked in a small voice. “Can we do that again?”
Ace froze, cursing his luck. “Luffy, that’s not right for us to do.”
“But Ace, I really liked it… it felt really good…”
Why was Luffy so cute, it was really tempting him and he couldn’t take it. “Luffy, you can’t do that with me,” Ace tried to explain in a level voice. “Because I’m your brother. We can’t. It’s wrong.”
Luffy pouted.
Ace was pointedly looking away because he knew that one look at Luffy’s cute face and he would probably give in.
“But Ace, why not? We do everything together. I love you.”
Ace was silent.
“Ace, please? I won’t tell anyone…”
Ace looked away resolutely, not saying a word. Luffy stared at the side of Ace’s face. The sun was starting to set and Ace’s skin looked golden. But Ace wouldn’t look back at him, and he soon lost his nerve.
“Okay, I’m sorry Ace, forget it. I was just —,”
“Fine.”
Luffy paused, not believing his ears. Ace turned back towards him slowly. In his eyes was an indescribable emotion.
All of a sudden, Ace looked so good. Luffy always knew Ace was good looking but not like this. It was like the possibility of doing more with him unlocked a whole flood of new emotions in his heart. Ace was strong and so attractive. An alpha. His alpha. It was almost like he was looking at a whole new person. But underneath was that sweet tang of familiarity, the bond forged for years and years. Luffy’s heart thumped wildly in his chest.
Ace’s lips twitched up in a small, sly smile. Then he leaned in.
Luffy didn’t know what to expect. His heart was beating so hard he could hear it pounding in his ears. Ace’s lips were soft and a little wet. It was chaste, and gentle. Then Ace shifted, capturing Luffy’s lower lip between his own. There was a glide, and their mouths slotted together. And then Luffy couldn’t think anymore. All he knew was the need for more, more, more.
Ace tried to keep himself controlled but Luffy was insistent. Of course Luffy didn’t know how to kiss, all he had was eagerness and instinct. But his little mouth was so warm and welcoming. It made Ace feel ravenous, like he wanted to tear Luffy apart and soak up every little piece of him. It didn’t take long before he’d wrestled Luffy down to the ground. The smaller boy was on his back, his hair mussed up. While Ace crouched over him, kissing him until he could barely breathe.
“Ace, Ace, Ace,” Luffy chanted into his mouth, desperately. Luffy wrapped his arms and legs around his perfect big brother and tried to pull him closer, closer. He fisted his hands in Ace’s shirt.
“Fuck,” Ace gasped as he felt Luffy’s enthusiasm. He was getting so hard and in their current position he couldn’t help but think about how easy it would be to just pin Luffy down and fuck his little brains out. Of course he wasn’t actually going to do that. But he couldn’t resist sneaking one of his hands under Luffy’s shirt and touching the bare skin underneath.
Luffy whimpered and arched his back up as he felt Ace’s hand on his tummy. Ace’s hand felt so big against his small waist. Ace pulled back from the kiss for just a moment so that he could push Luffy’s shirt up and expose his chest and stomach.
Luffy looked so slight and vulnerable with his slim torso bare. He was only wearing underwear and no pants. It hadn’t been noticeable before since Ace's t-shirt was so big on him. He was dirty and matted from the day but he was looking at Ace with loving and obedient eyes. As Ace took in the sight he felt mad with desire.
Ace must have spent too long staring because Luffy grabbed one of his wrists with both of his hands and placed his hand onto his belly. Ace’s hand from his thumb to his pink spanned almost the entire width of Luffy’s thin waist. “Touch me, please…” Luffy pleaded, staring up with glassy eyes.
It was too tempting an offer and it wasn’t any worse than what they were already doing. So Ace felt up Luffy’s torso. The skin was so soft and smooth. He made his way to Luffy’s chest and ran his thumb over one of Luffy’s cute nipples. The reaction was immediate. Luffy’s back arched up and he gasped.
“W-what was that?” Luffy said in shock. Ace grinned. “Do you like it, Luffy?” He thumbed over the little bud again, and it quickly started to harden.
“Y-yeah, it feels, ahh…” Luffy’s head dropped backwards and his eyes fell closed. He was so sensitive. No one had ever touched him like this before after all. Ace took his time with Luffy. He licked his thumb and brought it back wet, bringing another desperate sound out of his little brother as he played with him.
Luffy was in paradise, it felt so good having Ace touch him like this. In that place on his chest it made him feel so vulnerable. But he wasn’t scared, he was so glad that he was doing this with his big brother that he loved more than anything. He still wanted Ace to get closer. And he was embarrassed to admit it but he kind of wanted Ace to that part of him too, the dirty place between his legs. He didn’t know how to say it so instead he just wrapped his legs around Ace and pulled himself closer.
Ace gasped at the contact. Luffy had pulled their crotches against each other. It felt insanely good to get the contact but Luffy surely could feel his uncontrollable hard on. Then Ace realized with something between terror and excitement that Luffy was also hard. He could feel it through Luffy’s soaked through underwear. It seemed like it was a lot smaller which wasn’t a surprise since Luffy was an omega. Before Ace could stop himself, he had moved his hips and grinded against Luffy.
“Ah!” Luffy cried out. “Do that, do that again, Ace!”
Ace wanted to do it again. He wanted to do it again and again and again. But in a moment of clarity he caught himself. “Wait, Luffy,” he managed to breathe out. He crouched over Luffy’s body, holding himself up with his arms. “We — we can’t.”
Luffy was barely listening, trying to pull Ace back down to him with his legs. “Ace, please, please…”
“Luffy! Listen to me! We shouldn’t have even done this, we really… we shouldn’t…”
But Ace’s willpower wasn’t actually that strong. He was hoping that if he said something, anything, Luffy would snap out of it and realize what the hell they were doing. He was hoping that Luffy would wake up and get disgusted and run away, whatever. Luffy had to stop him, before he actually, actually…
“Ace, please, please don’t stop,” Luffy says in a tiny voice, with teary eyes. “Ace, it hurts.”
They were supposed to stop. But the thought of stopping, well, Ace would rather die. As long as they didn’t go all the way, it would be fine, right? So Ace bit his lip and said, “Can I try something?”
Luffy looked confused for a moment, but his expression quickly recovered and he nodded enthusiastically.
Ace reached down to the waistband of Luffy’s underpants. “Can I take these off?”
“Oh,” said Luffy. “Um, okay…”
“You sure it’s okay?”
“It’s — it’s gonna make me feel better, right?”
Well, Ace didn’t actually know. It probably would, but he really just wanted to see Luffy, to touch him. He found himself nodding anyways. “Yeah Luffy, it’ll make you feel good.”
Looking shyly in the other direction, Luffy let Ace peel the underwear down his legs and toss them to the side. They were soaked.
Now totally bare in his bottom half, Luffy felt too exposed. He brought his knees up and pressed his thighs together.
“Let me see,” Ace said gently, putting a hand on each of Luffy’s knees.
Reluctantly, Luffy let Ace push his legs apart. He was a complete and utter mess there. It was soaking wet, the shiny liquid coating everything, running down the insides of his thighs. His dick was painfully hard, cute and rosy, with a small patch of dark hair on top. Ace couldn't help but stare in awe. His little brother was so, so, so cute.
“S-stop it… Stop looking, Ace…” Luffy whined, his face beet red.
“Fuck Luffy, what are you doing to me…”
Luffy made a surprised sound as Ace leaned forwards and kissed him again. “Luffy, you’re mine, right?”
“Of course, Ace, always, I love you-,”
With a groan, Ace rolled them over so that Luffy was on top of him, straddling his hips. He gripped Luffy’s bare thighs and kneaded the flesh there. He probably squeezed harder than he should, but it’s not like it would hurt Luffy’s rubber body.
Luffy loved the possessive way Ace was touching him. The harder Ace squeezed him, the more desired he felt. Luffy was overflowing with love and need towards his big brother. No matter how rough Ace treated him now, it wouldn’t change how he felt.
Ace’s hands crept further up Luffy’s thighs until he was cupping Luffy’s ass. The younger boy was skinny but his butt was surprisingly soft and pliant. Luffy whined loudly into Ace’s mouth as he felt his big brother knead his cheeks and pull them apart. It felt so good to be touched there. He was scared that Ace would think it was gross and weird that he wanted this. Realizing that Ace wanted him too, wanted to touch him, even in this kind of dirty state, made Luffy feel so grateful and full of love.
As Ace groped at Luffy’s cute butt his fingertips dipped into Luffy’s crack which was soaking wet and slippery. His fingers brushed over Luffy’s hole.
Luffy didn’t expect that feeling and jerked in surprise, letting out a loud yelp.
“Fuck, sorry, I didn’t mean to —,” Ace started, pulling his hands away. He realized that he had really gone too far this time. He probably should have never touched Luffy’s ass in the first place but since he was already feeling Luffy up earlier he felt like it didn’t make much of a difference.
But as soon as Ace pulled his hands away Luffy all but sobbed .
“Ace, please, keep going, don’t stop!” Luffy cried out as he grabbed Ace’s hands by the wrists and placed them back on his backside.
“Fuck,” Ace breathed. Luffy was really not helping things! Now he felt like he had no reason to stop if Luffy wanted it so bad.
But still, he felt nervous, the previous wave of lust interrupted. So he just rubbed at Luffy’s bum lightly. But Luffy wasn’t having it.
“Ace, can you touch me, touch me there again, I… I liked it, sorry it surprised me earlier…”
Was Luffy talking about what he thought he was talking about?? Ace couldn’t believe his ears.
“Are you sure, Luffy?”
“I’m sure, Ace, I want it so bad… but I know it’s dirty so you don’t have to… I’m sorry…”
Ace cursed under his breath at Luffy’s cute and innocent words. It was driving him insane! He thought about it for a moment. Well, as long as he didn’t actually put his dick in, just touching Luffy some more wouldn’t be that bad, right? Plus, Luffy was literally begging for it.
So, Ace had no choice but to oblige. With one of his hands he ran his fingers through Luffy’s crack and over his hole again.
This time Luffy was expecting it and he made a happy sound of pleasure. With his eyes closed and trusting he kissed Ace again.
Ace rubbed back and forth across Luffy’s wet hole. He could feel the rim tensing and relaxing with Luffy’s anticipation. It was like it was trying to beckon him to get inside. Fuck. He wanted to explore the inside of Luffy’s body. He wanted to make Luffy fuck back against his fingers like a desperate slut. It was so tempting.
“Ah, Ace, that feels so good~” Luffy said in a small voice.
“You like it?” Ace breathed.
“Yeah, yeah I like it, I want more~”
Ace kissed down Luffy’s neck. As he licked over Luffy’s unmated scent gland, Luffy moaned in pleasure and arched his back. He pushed himself back against Ace’s fingers like he was trying to get them inside.
“Ah, Ace —,” Luffy cried out. “It feels so good, I want more, I want you inside, ah , inside, is that — is that allowed, Ace?”
Ace bit down lightly on Luffy’s scent gland, just to tease him. It made Luffy shake with desire.
“Yeah, Luffy. It’s allowed,” he said simply. Then he rubbed against Luffy’s hole again, which was getting impossibly wetter. “You want me here?”
“Yes , I want you, Ace!” Luffy gasped. “Please!”
So Ace obliged. Luffy was so wet that two fingers slid right in. Of course it was tight, so damn tight.
“How does that feel?”
Luffy was overwhelmed by the new sensation. He had been craving something inside so bad, but at the same time he’d never felt something like this before, and there was something that felt so wrong about the intrusion in that place. He wanted to say something but he didn’t know what. So he just moaned and drooled onto Ace’s shoulder where he buried his face.
Unsatisfied with the lack of response, Ace slowly slid his fingers out, and then back in again. The drag felt weird to Luffy and he kept making strained little sounds.
Ace was determined to make Luffy feel good. He wiggled his fingers inside of Luffy to seek out that sensitive spot that he knew must be there. At the same time he started licking over Luffy’s scent gland again.
When Ace touched his scent gland it made Luffy feel delirious. He wanted Ace to bite it and bond with him forever.
At the same time Ace finally touched something inside of his body. It made him freeze in shock. It wasn’t like the faint pleasure of having something inside. It was a direct jolt of sensation, foreign and strange but undoubtedly pleasurable. It kind of made him feel like he needed to pee.
“Oh, Ace, what was that?” Luffy cried out. He rocked his hips back to try to find that feeling again.
Ace grinned against Luffy’s neck, and pressed against the spot inside of Luffy again.
“ Ah, oh that feels so good! Ace!!”
Ace pressed on the spot again and again without giving Luffy a break. It was too much and turned Luffy into a mess, shaking and crying.
Ace couldn’t take it anymore. He really needed to fuck Luffy now. They had already come this far after all. And he knew that was exactly what Luffy needed. That’s what omegas needed during their heats: an alpha’s knot.
It was probably a mistake to have gotten to this point. After he felt how tight and wet and hot Luffy was on the inside, and heard all of Luffy’s cute and sexy little sounds, he was overcome with lust and needed to get inside of his little brother, now.
“Luffy, can I fuck you?” He breathed into Luffy’s ear.
Luffy moaned at the words. Honestly he didn’t even really know what it meant. But he could hear the desire in Ace’s voice and if it meant Ace wanted him then he would agree to anything. All those years ago he had taken a near death beating just to have a chance of being Ace’s friend. So of course he would let Ace do anything to his body. Especially if it was gonna feel so good like what they’d been doing so far.
“Yeah Ace, you can — you can do anything,” Luffy said breathlessly.
Ace growled and flipped them back over so that Luffy’s back was on the ground again. Ace looked down at Luffy’s gorgeous and small body. He felt guilty — this would be Luffy’s first time after all.
He loved Luffy so much. And he knew that Luffy deserved for his first time to be on a bed of roses with someone he loved. Sweet and romantic. Instead Ace was gonna take his little brother’s virginity on a dirty forest floor. It wasn’t right but he was too far gone to care. He just needed to fuck Luffy this instant.
He took his dick out of his pants and stroked it a few times. It had been throbbing hard for ages now and leaking at the tip. When Luffy saw it his eyes widened. Ace’s cock was so much bigger than his own. It must be because Ace was an alpha.
“Ace…” Luffy whimpered. He was a little scared but also eager.
“Shh, Luffy, I’ll make sure you like it,” Ace reassured. He grabbed onto one of Luffy’s hands and intertwined their fingers. Then he lined up his dick with the other hand and started to push in.
He had only prepped Luffy with two fingers and his dick was a lot bigger, so it was quite a stretch. Luffy arched his back and gasped at the feeling. It was so overwhelming. He squeezed Ace’s hand tight.
“It’s almost in, you’re doing so good Luffy.”
Luffy stared up at Ace with love in his eyes. “Ace, does it feel good?”
Ace grinned. “Of course Luffy, you feel amazing.”
That was all Luffy needed to hear. He couldn’t be happier to be able to have his first time with Ace. He had always loved his big brother but now that he thought about it he had probably been in love with the older boy this whole time. Ace was his whole world. It didn’t matter they were on the ground and covered in dirt and leaves. This was the most romantic moment of his life.
“Ace, I love you,” Luffy said in a tiny voice as Ace started to move inside of him.
“I love you too,” Ace said. He fucked into Luffy slowly and gently, making sure that the younger boy had time to adjust to him. It felt just as perfect as he had imagined. Luffy’s scent had gotten so sweet, too. He could tell just from the pheromones that the omega was feeling satisfied and full of love.
Luffy grew more vocal with his pleasure, so Ace started to pick up the speed. It wasn’t long before he was fucking into Luffy with earnest. After a while he felt like he couldn’t get deep enough from this angle, so he hoisted Luffy’s legs up over his shoulders. Then, folding Luffy’s body in half, he leaned over and started slamming into the younger.
“Ah!! Ace!” Luffy shouted. It was so much; he was sure that if his body wasn’t made of rubber he would be in pain. But he only felt pleasure and the overwhelming sensation of Ace’s desire.
“Fuck, Luffy, you’re — ah — so good!” Ace panted.
Ace’s dick was pressing right up against that special spot inside of Luffy. Since his dick was larger than his fingers and went deeper it was moreso sliding back and forth across that spot rather than poking at it directly. Which meant the sensation was less intense but instead it caused a pleasure to slowly build up in Luffy’s gut. That pleasure got hotter and hotter until it felt like it was gonna explode. Luffy could tell that he needed a release but he didn’t know how. He felt like he was gonna pee.
“Wait, Ace, Ah! Something — it feels like, I’m gonna — wait, wait, wait —,”
Of course Ace wasn’t gonna stop, not when it was so good. So Luffy could only squeeze his eyes closed and take it. He tried really hard to hold it in but it became too much, and everything spilled over, the pleasure coursing uncontrollably through his body. For a second he could only see white behind his eyes and his body shook. To his horror his dick squirted out a bunch of liquid making him feel like he had wet himself. The worst part was he got it all over Ace’s stomach too.
But Ace didn’t seem to be turned off at all by it. Instead the older boys eyes dilated as he stared down as his younger brother making a mess of himself.
He couldn’t believe that Luffy came untouched like that just from his dick. It was so fucking hot.
“Ace, I’m sorry, I peed…” Luffy said, breathing hard.
Ace couldn’t help but laugh, endeared. “No Luffy, that’s cum,” he explained, pausing his hips with his dick buried to the hilt. Letting Luffy catch his breath.
“Cum?”
“Yeah, it’s what happens when you feel really good.”
“Oh.” Luffy sighed. He was relieved that Ace wasn’t mad at him for making a mess.
Ace watched the mesmerizing rise and fall of Luffy’s chest. Out of nowhere, Luffy suddenly looked up and said, “What about Ace? Did Ace feel good?”
“Fuck, of course,” said Ace. He presses a kiss to the inside of Luffy’s ankle. “But I’m just getting started. I gotta fuck you a lot more before I finish.”
“Oh,” Luffy said with wide eyes. Even though he just came once his heat was already coming back and he was feeling unsettled and needy again. “That’s — please, I want more.”
Ace didn’t know how Luffy learned to be so polite. But he didn’t have time to think about it now, and he sure wasn’t complaining. Luffy looked so adorable, asking nicely to be fucked. So Ace had to give him what he wanted.
He flipped Luffy onto his hands and knees, and fucked him like that until Luffy's arms gave out and then Ace pushed him down onto his belly. He put his fingers in Luffy's mouth and Luffy moaned like a slut, like he needed it. Even though Luffy's front was getting all scratched up by the friction as Ace fucked down into him, all he felt was the overwhelming pleasure of being wanted and owned.
As the sun finally set behind the mountain Ace pressed his mouth to Luffy's unmarked scent gland. In this position, it was so ready for him, begging him to mark and claim the younger boy. Just like before, Ace softly bit at it, testing Luffy.
"Ah, please Ace -," Luffy immediately gasped out. He turned his head to give Ace easier access. "Ace, mate me, please -,"
Ace was shocked. How did Luffy even know about something like that? Or was it just his instincts talking? Fuck, he wanted to so bad. Luffy was so pliant and perfect under him. He wanted more than anything to mate Luffy completely, to bite down on Luffy’s neck like an animal and claim him forever. After all Luffy was his , he couldn’t let any other alpha even think about touching Luffy. Ever.
But he knew that was a line that he couldn’t cross. No matter how much they wanted each other in the moment he couldn’t just mate him and tie Luffy down to him forever. They were still so young after all. So in an impressive feat of restraint, he pulled away from Luffy's neck.
Instead, he switched their positions again, pulling Luffy on top and trying to get him to ride. Of course it mainly just ended up with Ace fucking up into him while Luffy whined and drooled incoherently after coming so many times they lost count.
Finally they ended up in the same position they started in, Luffy on his back with his legs wrapped around Ace. Ace had held out for a long time but he was getting way too close. Luffy looked so fucked out with his eyes lidded, his neck and collarbones littered with hickeys and bite marks. He was still whimpering with oversensitivity and pleasure after countless orgasms, enough that he was completely dry and couldn’t produce anymore fluid. He seemed to be on the verge of passing out.
So finally, Ace let himself spill inside of Luffy. He gave a few final thrusts, and he pushed his knot inside, sealing the two of them together.
Even though Luffy was quite delirious at this point he could feel them joining together. “Ace…” he moaned. “Ace loves me…”
“I love you, Luffy,” Ace breathed out. It took a herculean effort to keep himself propped up so he didn’t collapse with his full weight on top of Luffy.
“Here, get on top baby,” Ace said gently as he switched them again. Luffy choked out a moan as he felt Ace’s knot inside of him as they moved. He collapsed against Ace’s chest and Ace patted his hair.
“You okay?” Ace asked as he gently stroked Luffy’s body.
There was no response. Ace looked down to see that Luffy had fallen fast asleep. With his knot still inside. He couldn’t help but chuckle; how typical.
As Ace waited for his knot to go down he couldn’t help but gain more and more clarity about what he had just done. This was what he’d been afraid of this whole time. He knew that he wouldn’t be able to control himself as soon as Luffy presented.
Maybe it was fate and he was always meant to take Luffy like this.
Ace planted a kiss on the top of Luffy’s head. Luffy belonged to him now.
He couldn’t wait to do it again.