#merman!sunday x cecaelia!reader

[aventurineswife]

A Refuge Beneath the Waves

Summary: Sunday seeks solace after a stressful day of diplomatic negotiations. You, a cecaelia with a penchant for playfulness and wisdom, guide him to your secret undersea sanctuary. Amid bioluminescent waters and coral cove serenity, you remind him of the beauty in stillness and the importance of connection, fostering a moment of quiet intimacy between two kindred souls.

Tags: @spinnyboination, Merman!Sunday x Cecaelia!Reader, Fluff, Comfort, Gentle Intimacy, Slow Burn.

The ocean was a symphony, humming its ancient melodies as bioluminescent trails wove through the undersea world. The water shimmered with life, flickering gold and silver as creatures danced through coral and kelp.

Sunday swam with fluid grace, his tail glinting faintly in the dim light of the abyss. His halo, glowing faintly behind his head, illuminated his features in ethereal hues as it pulsed in rhythm with his thoughts. The weight of the day lingered in his mind—a diplomatic encounter gone awry with a neighboring pod, his efforts to broker peace once again met with mistrust. He sighed, pausing mid-swim, his wings twitching faintly in frustration.

"Trouble in paradise, little dove?"

Your voice, warm and tinged with mischief, echoed through the currents. Sunday turned, his eyes meeting yours. You drifted closer, your cecaelian lower half—moving effortlessly through the water. Your eight tentacles, each tipped with bioluminescent patterns, shifted lazily as you watched him with a crooked smile.

"Nothing unusual," Sunday replied softly, his wings fluttering slightly behind his ears. "Merely the usual dance of ideals and realities clashing."

"Ah, the plight of a dreamer," you teased, circling him playfully. "You're far too good for them, you know. Not everyone appreciates the grandeur of harmony."

Sunday chuckled, the sound soft and lilting. "And yet, I cannot abandon the dream. It's... complicated."

"Complicated is just another word for interesting," you countered, stopping in front of him. "Why don’t you let me distract you for a while? You look like you could use a break."

"I—" Sunday hesitated, but your warm gaze melted away his resistance. "Perhaps you're right."

You beamed and reached out, gently taking his hand in yours. Your fingers were webbed, the faintly translucent membrane between them glimmering faintly. Sunday’s touch was cool and calming, and you felt the faint hum of his energy through your skin.

“Follow me,” you said, tugging him along.

The two of you swam together, weaving through the towering kelp forests until you reached a secluded cove. Here, the ocean floor was a mosaic of colorful anemones and gently swaying sea fans, their hues amplified by the glow of the moonlight filtering through the water’s surface above. You guided Sunday to a smooth rock outcropping, settling there as your tentacles curled beneath you in a comfortable nest.

Sunday joined you, folding his tail beneath him. "This is lovely," he murmured, gazing around.

“Isn’t it?” you said, leaning back on your arms. “This is my little sanctuary. A place to just... exist. No politics, no expectations.”

Sunday sighed, his wings relaxing as he mirrored your posture. “I envy that simplicity sometimes.”

You glanced at him, the golden glow of his eyes softer now, contemplative. “You should visit more often,” you suggested. “You don’t always have to carry the weight of the world on your shoulders. It’s okay to just... be.”

For a moment, Sunday was quiet, the rhythmic sway of the water filling the silence. Then, he gave you a small, genuine smile. “You always know how to bring me back to myself,” he said.

“Someone has to,” you quipped, bumping his shoulder gently.

The two of you stayed there for a while, talking softly about everything and nothing. Sunday’s voice was like the melody of the ocean itself, and you found yourself drawn to his thoughtful words, the way he painted pictures of his dreams and fears. In turn, he listened intently to your stories, his eyes never leaving yours.

As the hours passed, the tension in Sunday’s frame seemed to dissolve. He leaned back against the rock, his wings fluttering faintly as he gazed at the play of light on the water above.

"Thank you," he said softly, his voice barely audible over the gentle hum of the ocean.

"For what?" you asked, turning to look at him.

"For reminding me of the beauty in stillness," he replied, his gaze meeting yours. "And for always seeing the best in me, even when I doubt it myself."

Your heart fluttered at his words, and you reached out, brushing a strand of silver hair from his face. "That’s easy," you said with a smile. "There’s so much to see."

Sunday’s halo pulsed faintly, its glow a soft, warm gold. He reached out as well, his fingers grazing yours, and for a moment, the ocean seemed to hold its breath.

And in the quiet, beneath the dreaming waves, you found something more profound than words—a connection that needed no explanation, only the quiet truth of its existence.

[aventurineswife]

Welcome to my HSR Masterlist 5!

Here, you'll find HSR fanfictions, headcanons, and maybe a few surprises along the way.

Feel free to send in your requests!

The Weight of Ignorance | Ratio x Reader

Little Reflections | Jing Yuan, Blade, Sunday, Jiaoqiu x Reader

More Self Aware HSR AU | Part 14 | Part 15 | Part 16

A Cake-Cat’s Revolution | Kafka x Reader

Rest My Little Songbird | Jing Yuan x Halovian!Reader

A Promise to Protect | Jing Yuan, Boothill

“To be loved is to be known” | Aventurine x Reader

The Distance Between Here and Home | Gallagher, Welt x Reader

Where Luck Meets Grace | Aventurine x Halovian!Reader

Rest, Just This Once | Dan Heng x Reader

In Quiet Moments, We Heal | Dan Heng, Sunday x Reader

Unmasked in the Silence | Aventurine, Boothill, Sunday X Reader

Rest Your Weary Head | Dan Heng IL, Aventurine, Kaveh x Reader

“We're just coworkers. Nothing more” | Aventurine x Reader

The Rose of My Heart | Argenti x Reader

“Magnificent, But I'll Take 'Nice'” | Aventurine x Teen!Reader

Wings of Contemplation | Sunday x Reader

Even Stoics Need Softness | Dan Heng x Reader

Tiny Terror, Grand Reactions | Kaveritas, Alhaitham, Boothill, Argenti x Reader

One Kiss Is All It Takes | Ratio, Kaveh, Aventurine, Itto x Reader

“You’ve Done Enough for Today” | Dan Heng, Sunday, Aventurine, Ratio x Reader

No Rush, No Burden | Jing Yuan, Robin x Reader

Chocolate-Covered Honesty | Sampo x Reader

Not Perfect, but Still Yours | Kaveh, Dan Heng, Ratio, Ruan Mei, Sunday x Reader

“You're a grown-ass man” | Dan Heng, Ratio, Sunday, Kinich, Kaveh x Reader

Whispers of Snow and Starlight | The Herta x Reader

A Heart Hidden, A Bear Given | Aventurine x Reader

The Jacket Chronicles | Aventurine, Ratio, Jiaoqiu, Moze, Caelus, Dan Heng x Reader

The Heart's Unseen Light | Sunday, Aventurine, Moze, Jiaoqiu x Nikki!Reader

A Vow in the Starlight | Ratio x Reader

“The harder the battle, the sweeter the victory” | Ratio x Female!Reader

Soft Lies and Sleepy Smiles | Sunday, Dan Heng, Aventurine x Reader

The Art of Letting Go | Sunday x Reader

Planted with Love | Aventurine x Female!Reader

Illusions of the Mind | Sunday, Aventurine, Dan Heng x Reader

We Are Young | Ratio, Gepard, Aventurine, Sunday x Reader

“Your Voice is My Favorite Constellation” | Sunday x Reader

Say It Wrong, Make It Right | Ratio x Reader

Gems of the Soul | Aventurine, Dan Heng, Sampo, Jing Yuan x Reader

Trust is Earned, Not Given | Aventurine, Sampo, Ratio, Childe x Reader

A Language Without Words | Dan Heng x Reader

All in, Sweetheart | Aventurine x Reader

“The cold never bothered me anyway” | Aventurine, Caelus, Sampo, Childe x Reader

The Smell of You | Aventurine x Reader

Haunting Me | Aventurine x Reader

Every Closed Door Leads to a New Beginning | Aventurine, Phainon, Dan Heng x Reader

Falling, But Not for the First Time | Caelus x Reader

Spice Is the Soul of Life | Jiaoqiu x Reader

Falling Into Thought | Ratio x Reader

The Price of Kindness | Kaveh x Reader x Ratio

A Refuge Beneath the Waves | Merman!Sunday x Cecaelia!Reader

“To know, to be known, and to understand; that is the ultimate goal” | Ratio x Reader

For You, My Heart | Kaveh x Reader x Ratio

The Eyes Are the Window | Aventurine x Reader

(Read this before making a request!)