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PLATONIC Percy Jackson x Older Mermaid Half-Sister

Warnings/Notes: English is not my first language. Characters appearances are based from the books NO HATE TO THE SERIES.

“Don’t go too far,” is what he remembers his mother saying—soft, warm, laced with the kind of care that didn’t need to be loud to echo in his tiny chest.

But she never specifically said how far.

So Percy Jackson, five years old and full of questions he didn't know how to word yet, wandered with purpose only a toddler could have. His legs, short and pudgy, barely made long strides, but they carried him far enough that the cool spray of the ocean mist began to kiss his sun-flushed cheeks.

He trudged forward, unwavering, clutching a paper bag filled with what he considered the world’s finest treasure—blue cookies, the kind only his mom knew how to make just right. He held it with stubborn little hands, the same way he held onto everything he loved: tightly, protectively, like the universe might try to take it from him at any moment.

His green eyes—cheeky, curious, the kind that sparkled mischief and melancholy all at once—roamed over Montauk’s weather-worn horizon.

He took it all in, like a painter committing every stroke to memory.

The sand was a warm, golden-brown that slipped between his toes like silk, comforting and familiar. Above, the sky wore a shroud of grays, clouds clumped together in a quiet hush that whispered of rain yet to come. And before him stretched the sea—vast, deep, unknowable—a shifting field of green and blue that felt like it saw him, knew him, called to him.

The waves came and went, a quiet lullaby of motion. They rolled toward him, then sighed back into themselves, leaving trails of frothy lace and broken shells in their wake. Percy stopped at the place where the ocean kissed the land—a sacred line, delicate and fleeting—and stared.

Something shimmered.

Half-buried in sand was a shell. Broad, pale, like a smile turned on its side. It sparkled with a pearlescent sheen, almost glowing under the gray light. Percy’s eyes widened, his lips parting in a quiet “whoa.”

Still clutching his cookies in one arm like a soldier protecting a sacred relic, he crouched down with the awkward elegance of a child who hasn't quite figured out the mechanics of gravity.

He reached for the shell.

The wave beat him to it.

A teasing rush of water surged forward, swiping the shell from beneath his outstretched fingers and pulling it back into the sea’s embrace like a mother snatching away a secret.

“Oh no!” he cried, his voice small against the wind. He scrambled forward, but his feet betrayed him. He fell back with a soft plop, landing on his bottom with an indignant squish of sand and wetness.

He blinked at the water. Then blinked again. And slowly—almost like a storm cloud creeping in from the edges of his eyes—his lower lip trembled.

He was five. And five-year-olds are allowed to cry. About toys, and cookies, and scraped knees. About seashells that get swept away by saltwater.

But he didn’t want to cry.

Not because it didn’t hurt—but because he was tired of hurting.

Because even at five, Percy Jackson had learned that crying doesn’t always bring someone to pick you up. That sometimes, when you cry, all it does is make your mom sad, and she tries to smile through it anyway.

Because he saw how tired her eyes looked at night, after long shifts and longer subway rides, and how she never let him see her cry, even when he caught her staring at the bills in the kitchen drawer.

Because when he cried once at school—when a teacher yelled at him for a thing he didn’t understand—no one comforted him. They called him a troublemaker. They told his mother he was difficult.

Because sometimes, the world seemed to punish softness.

So no. He didn’t want to cry. Not again.

He sniffled, rubbed his face with the back of his sleeve, and forced a sigh from his tiny chest like a grown man might.

Then he stood up, wobbly and brave, brushing sand from his shorts with a sort of solemn dignity. He turned back toward the lighthouse where his mother waited, probably with a warm blanket and soft hums in her voice.

And then—

Something moved.

Just out of the corner of his eye.

Something shimmered above the water. Not a seagull. Not seaweed. Not driftwood.

Something tall. Something gliding. 

A... a tail?

Percy blinked hard.

Once. Twice.

The sunlight danced off the waves like a thousand sparkling mirrors, and for a moment, he thought maybe—just maybe—he imagined it. Maybe the sea had played a trick on his eyes. He rubbed at them with the back of his hand, smearing cookie crumbs and sugar across his cheek.

But then he saw it again.

A tail.

Long. Big. Beautiful.

It shimmered with soft mint scales that glinted with silver where the sun caught them, rising up like a great, lazy arc above the rolling waves, before slipping back beneath the sea’s surface with a sound like silk being pulled through fingers.

“Woah…” Percy whispered, his little voice barely louder than the breeze.

The curiosity that bubbled inside him was too much to contain. It was a warm and fizzy kind of feeling, like soda pop bubbling behind his ribs, compelling his chubby feet to step closer to the edge of the water. The ocean lapped gently at his ankles now, like it was greeting him—like it knew him.

He stood there, blue cookie bag clutched tightly to his chest, looking out into the endless blue. The tail didn’t appear again. The minutes stretched long and quiet, and Percy’s wonder started to droop like a wilting flower.

He pouted.

But then… something else rose.

First, it looked like seaweed—dark, tangled shapes rising with the tide. But as the water shifted and light caught the shape, Percy realized it wasn’t seaweed at all.

Curls. Floating, spiraling, impossibly long. They bobbed gently on the waves like kelp and midnight, drifting just beneath the surface before slowly lifting higher.

Then—a face.

His heart skipped. His breath caught.

A young girl was surfacing from the depths.

Your head broke the water slowly, deliberately, as if the ocean had been cradling you and was now offering you up to the world. Your eyes—sharp, clear, piercingly sea-green—locked with his the moment your face fully emerged.

Percy stared, mouth slightly agape.

He had never seen anyone like you before.

There was something… off, but not in a bad way. Not scary. Just different. Beautiful. Otherworldly. Your features weren’t like the humans he knew. Your cheekbones sat higher, your lashes longer, your pupils darker and deeper, like little whirlpools of emotion.

But it wasn’t just your looks that made Percy freeze—it was something deeper.

Something inside him stirred.

Like a bell ringing far away in his chest. Familiar. Longing. Like a song he forgot the lyrics to, but somehow still knew the melody of.

“H-Hello,” he stammered, holding his cookie bag like a knight holds a shield. His small voice quivered between awe and politeness.

You didn’t answer at first.

You just tilted your head—watching him.

Like you were seeing more than just a boy. Like you were seeing everything.

And then… you smiled. A slow, knowing smile that didn’t quite reach your eyes. Not yet. But it was gentle. Warm. Heartbreaking, if anyone knew what your heart was doing.

He mirrored you, head tilting to the side like a puppy, and your smile grew a little wider. He was cute. So small. So innocent. You had waited so long to see him up close. Six years since he was born—six years of waiting in the currents, watching from afar. And now here he was. With a smudge of cookie on his cheek and the sunlight kissing the brown of his hair.

You moved closer, cutting through the water with the grace only those of the sea could possess. The tide curled around you like it knew your name.

When you came close enough, Percy gasped again.

His gaze had traveled to your arms��faint fins, almost like feathers of light, glowed on your skin. And your smile, once kind and serene, now revealed rows of polished teeth—sharp but not cruel. Not monstrous. Just… natural.

He should have been scared.

But he wasn’t.

You raised your hand, slow and gentle, and opened your palm.

The shell.

Percy gasped, eyes lighting up.

“My shell!” he squealed.

He snatched it from your hand and cradled it like a treasure.

“Thank you!” he beamed up at you, eyes sparkling with the kind of joy only a child could give freely. “Thank you!”

Your fingers curled slightly, resisting the urge to brush his cheek.

You had meant to give it back to him like this. The very shell he dropped in the water just a while ago. 

Not because of the shell.

But because he had touched it. And it was the only thing of him you had.

Until now.

You reached your hand out—trembling just slightly with an emotion too big to name. You wanted so badly to touch his hair. To tuck it behind his ear. To brush away the crumbs.

You were his sister.

His older sister.

But Percy didn’t know that. He couldn’t. Not yet. Not until the time was right. Not until the tides changed.

So you hesitated.

Hovering just above his head, fingers outstretched…

“Percy!”

The sound tore through the wind like a blade.

Percy turned. “Mom!”

Sally Jackson’s voice was clear now, urgent and loving, as she hurried down the stairs of the lighthouse toward the beach. Percy waved his little arm high above his head.

“I’m here!”

In the brief seconds it took him to turn back to you—

You were gone.

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Would it be interesting if I were to write a fanfic about a daughter of ares (OC) who returned back in the past after she died 3 times because she was cursed by Kronos to forever suffer in a time loop and experience different times of death. That is why Ares had no choice but to coincide with Kronos in exchange for his daughter get rid of the wretched curse bestowed upon her.

The daughter of ares who almost went completely insane and could no longer freely express out her rage and just sits silently in a corner, harboring each and every little burn that blazes inside her heart until the day she finally gets her revenge.

The daughter of ares who isn't so expressive and is often an outcast in her own cabin, but still gets pulled in some little troubles caused by her siblings.

The daughter of ares who kept quiet about battle strategies and prefers to do it on her own and always works out in the end.

The daughter of ares who holds much greater rage than her own siblings and truly has the will to kill someone.

The daughter of ares who doesn't hesitate to murder any creature.

The daughter of ares who is a closeted lesbian but prefers not to dwell so much about it because it would just distract her in fear that the day when she finally falls in love, she's soon bound to be heartbroken.

The daughter of ares who has trust issues with men, well, everyone at this point. Because of what happened to her on the previous timeliness.

The daughter of ares who could see what her father is trying to achieve by being so cold and commanding to his children.

The daughter of ares who got along with the son of Hades, Nico Di Angelo because she also has the same dislikes as him. (it's Percy, but soon dissapointed it wasn't just hate all along. But still like the guy because they both get along).

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Imagine #2

An Aphrodite kid who knows they're pretty, who knows someone's out there for them, and who knows that love is a wonderful thing. However, they're too scared to commit themselves in FALLING IN LOVE because they know that love will truly hurt when it's not right.

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Imagine a Filipino demigod that got claimed by Poseidon which dramatically explains why her mother's side of the family is incredibly rich and owns more than 5 islands and coasts in the Philippines.

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Imagine a trio that consists of a lesbian daughter of Dionysus, gay son of Aphrodite, and a aromantic son of Athena. Being one of the most chaotic and awesome trio in camp.

Daughter of Dionysus

Son of Aphrodite

Son of Athena

Lightning Thief:

"You like the son of Poseidon? Bitch, why?"

"First, it was luke. Second, it was Michael Yew, and now the offspring of the sea. Just pick one."

"Why do you both sound so dissapointed?!"

"Because it's a boy!"

_______________________________

"So... Which side are we gonna choose?"

"Obviously— it is to my dearly beloved!"

"I have to agree with him on this. Logically speaking, Zeus lacks any warranty or proof that Percy was indeed the one to steal the lightning bolt. Poseidon's act of defense is normal, given his honor and his son is in the line."

"You know, you could've just said that Zeus is wrong and Poseidon made a point."

_______________________________

"Stop drinking!"

"I can't!"

"Why not?!"

"Luke stole all the coke I storaged that would last me for 3 more days in this hell!"

"Well... At least he didn't poison you."

"What..?"

"Oh, I mean— Awhile ago I saw him summoning a scorpion to poison my beloved."

".... Dude...what the fuck?!"

"How did you know? Were you— No— Were you stalking percy?!"

"Pfft— Why would I?!"

"..."

"..."

"..."

"... Yeah I kinda did. Met Ares by the way, and I won't lie— I could totally see why my mom chose him. The man was ripped."

"Dude..."

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Any other Poseidon kids out there??

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PERCY JACKSON WITH LITTLE SISTER READER (MUTE AND SUFFERING FROM PTSD)

Warnings: Mentions of Abuse and Mental Health

Contains: Fluff, Slight Angst, and Platonic relationships

PART 2

Don't be scared...

________________

It had been two days ever since you got acquainted with your older half-brother and stayed with him inside your father's cabin.

You never really knew your real father. All you knew is that your mother hated him so much, and told you that he abandoned you both ever since you were born. Your step-father felt the same together with his daughter and son, your step-siblings.

Your family hated your sea green eyes. A sign that you weren't a part of the normal gene in this family. It was to the point that the verbal abuse they threw at you became physical and very violent. Your step-siblings would bully you, and the adults in the family would turn a blind eye. If you even caused a single small mistake or one of your step-siblings caused trouble, the punishment would always land on you. Or when your parents are just mad and needs something get their anger out, then their anger would always aim at you.

You didn't understand why you were being treated like this. You didn't even understand why you were even being hated by everyone who you thought you loved. Even at a young age, after a few harsh words being thrown at you almost everyday, you felt like giving up. You were slowly believing that nobody would ever come to love you.

However, he came along. Your brother. Percy Jackson.

You were scared of him at first, thinking that he would treat you like your step-siblings, but he never showed such hatred nor hostility to you. In fact, he was kind, gentle, and understanding. Always smiling at you and giving you good if you ever felt hungry.

He never forced you to do something you don't want to and let's you lay on the bed to rest together with a bunch of sea creatures plushies around.

You were still anxious being near him. The uneasiness of betrayal laying heavy inside your head as you continue to close off any annoying emotions.

However, Percy didn't give up. He would always watch over you during the day when you feel like walking around the cabin with your plushies, afternoon as you sat outside the cabin, and during the night when you're ready to go to sleep.

He wanted to make sure you felt safe around him. Wanting him to make it clear to you that you're important and is now a precious member in his family.

Until one night, he heard you crying silently under your blanket.

"Hey... Shh... I'm here I'm here, don't be scared..." he whispered to you. Soothingly patting the small of your back as you panted with tears in your eyes.

"You got a bad dream? That's alright, I got those too. And I hate them." He was gently smiling while continuing to talk to you. Percy thought that it might make your forget the bad dream even a little bit or possibly make you to open up to him even just a bit.

"It's okay. I'm here... Your brother is here..."

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PERCY JACKSON WITH LITTLE SISTER READER (Mute and Suffering from PTSD)

Warnings: Mentions of Abuse, Mental Health, Cussing

Genre: Fluff and slight angst

Part 1

I got you sister...

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After the war with Gaia and getting out of Tartarus alive whilst forming new friendships with camp jupiter— Percy's days has been pleasantly peaceful, which he believed was too good to be true considering the Gods.

While hanging out with his girlfriend, Annabeth. A young camper suddenly went up to them and told them that Chiron was looking for both of them.

The lovers shared questioning glances at each other, both of them worrying about the same thing if another prophecy had revealed itself, and if it's talking about them.

They went to the big house and was surprised to see Nico waiting outside by the doorframe.

"Nico, what's going on?" Nico didn't say anything for a moment before turning his head and staring at both Percy and Annabeth. "You should go see it for yourselves."

Percy held Annabeth's hand for support as they both went inside and was even more surprised to hear an object being thrown to a wall by the clinic and hurriedly went over there to see what was going on.

"Will!" They saw the young Apollo boy with his hands held in front of him as if in surrender as he tries to calm someone in one of the rooms he was in.

"Shh..." Chiron was inside the room. Shushing the lovers and requesting them to shut their mouths. Percy looked over his girlfriend's shoulder— only to see a little girl hiding behind the beds.

He could hear her sobbing. Her eyes red and puffy as tears continue to drop from her sea green eyes.... 'Wait, Sea green eyes...?' Percy pondered.

"It's okay... Don't be scared... We'll help you..." Will said in a soothing voice, trying to calm the panicked child. After a few minutes, they could see she was slowly calming down and Will took this chance to take a few steps closer to her.

"There, There," Percy watched as how Will gently tries comfort her trembling form and carries her to the bed. He saw dribbles of red blood on her hand, explaining the broken glass and vases inside the room.

Soon after that, Chiron explained to them that a merman that showed up by the coast near the camp, visited him last night with a sleeping girl in his arms. The merman told him that she was a daughter of Poseidon, who had suffered from heavy abuse by her own mother and step-father, together with her other step-siblings. The merman warned him to take good care of her, or else the God of seas will take drastic measures himself.

Percy was confused for a moment. Who was this merman? And did his father really say that? Whatever the case, after hearing what his new little sister had suffered, he didn't really care what his father might do. All he knows is that he needs to let his little sister know that she's safe now.

After an hour, Will got out of the room and informed them that she was sleeping. However, he brought terrible news. Currently, the girl was mute and is suffering from PTSD due to the amount of trauma she carries at such a young age. Furthermore, he had found out last night that she had so many bruises and scars from constant abuse.

Percy's blood almost evaporated like a volcano. Constant abuse? TO A CHILD NOT OLDER THAT 10 YEARS OLD?!

Percy thought that those people with her in that terrible house were fucking insane. They were monsters, each and every one of them.

Chiron told Percy to wait for his little sister until she heals and has the strength to take a step outside the clinic. So for now, he had to prepare his cabin that might not frighten and threaten the little girl's mental health.

Percy immediately jumped into action with the help of Annabeth and his friends. (Grover, Jason, Piper, Leo, Nico, Hazel, Frank, and Will.) They decorated the cabin a little bit, making it a bit more outgoing and radiating a positive aura.

Percy even asked his mom, Sally, if she could bake some cookies for his new little sister, and Sally happily agreed.

When the day has finally come where you get to step out of the clinic and go to your cabin. Your older half-brother was already waiting for you with open arms.

He greeted you with a gentle smile, but you didn't say anything back. You founded it difficult to even utter out a word, and was still scared to say anything regardless. Percy was very understanding with you. Taking his time to understand the things you find comfortable with and the things you dislike.

He noticed that you felt pressured when you were out on public during the camp tour as almost every camper had their eyes on you.

You started sweating and tears were gradually building up in your eyes. Percy noticed it quickly and carried you back to your cabin with his eyes glaring at the people who were staring at you.