Honkai Star: Rail x Reader Oneshots

Temptation Awaits... Or Not? | Siren! Aventurine x Reader

Summary: After rescuing a strange man entangled in a fishing net on the shore, you find yourself drawn to his mysterious allure. A cunning siren, initially tries to manipulate you into joining him in the ocean with dark intentions, hoping to lure you in as his next meal. However, your oblivious kindness and unwavering curiosity surprise him.

Tags: Aventurine x Reader, Siren AU, Slow Burn, Enemies to Friends (to lovers hinted), Unrequited Manipulation, Emotional Attachment.

Warnings: Mentions of manipulation and implied predatory behavior, Minor dark themes (His initial intent to consume Reader).

The evening waves brushed gently against the shore, and you squinted through the dimming light. There was something caught in the fishing net, tangled among seaweed and driftwood. As you got closer, your heart skipped — it wasn’t a fish or some ocean debris, but a man.

Or at least, something like a man. He had sandy-blond hair plastered to his skin, faint glimmers of scales across his arms, and the most mesmerizing eyes you’d ever seen —  deep magenta and an eerie cyan, holding a dangerous allure. His gaze fixed on you, intense yet unreadable, and a shiver ran through you.

"Are you alright?" You called, pulling the net away from his arm. "How did you get tangled like this?"

He didn’t answer right away, his eyes flicking over you with a calculating sharpness. He had that charm about him, like something out of a dream.

Finally, he smirked, a hint of danger in it. “I suppose I owe you my thanks, human.” he purred, voice smooth like velvet, laced with a strange rhythm that drew you closer.

You blinked at the formal tone, still kneeling as you tried to pull more of the net off his finned tail, which you now noticed was covered in shimmering green-gold scales. Beautiful, you thought absently, captivated by the creature you were freeing. He watched you, head tilted just slightly, perhaps in wonderment, perhaps in mockery.

“You could repay me by… inviting me out for coffee sometime?” you joked, still feeling his eyes on you.

A soft chuckle escaped his lips. “Come with me to the ocean,” he murmured, voice silken. His gaze drifted to the horizon, then back to you, almost hypnotic in its intensity. “You’ve freed me, and the ocean has wonders far beyond your world, dear human. If you come with me, you’ll know things mortals have only dreamed of.”

You laughed, a sound that startled him slightly. “Sorry, I think I’d drown.” you said, brushing your hands off after the net finally slid away.

His eyes darkened, a small frown forming on his perfect face, as if he hadn’t expected you to resist so easily. But he let the expression slip away, eyes returning to a languid charm. “Perhaps another time, then.”

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The days after, you couldn’t get him out of your head. You found yourself returning to that same shore, sometimes in the morning, sometimes just as the sun would set. And, to your quiet joy, you’d see him there — the strange, entrancing siren with the colorful eyes, lounging on the rocks, waiting.

At first, he merely observed you with a slight smirk, as if always planning something, but your idle chatter, your laughter — these things seemed to chip away at whatever distance he tried to maintain.

“So… you’re not joining me today, either?” he’d ask with a mocking sigh each time you saw him. He’d run his fingers through his hair, feigning impatience. “Perhaps you’re afraid of what I might show you.”

You laughed, shaking your head. “If it weren’t for the whole breathing underwater thing, maybe I would!”

He sighed, a little defeated but strangely amused, his head tilted as he continued to study you. It had been so easy in the beginning — the humans who wandered to the shore were always so fascinated by him, so eager to listen, to obey. But you, with your quick, kind smiles and seemingly endless curiosity, had somehow slipped past his charms.

“Are you always so… dense?” he asked one evening, a flicker of frustration behind his words.

You grinned, shrugging. “Or maybe I’m just smart enough to know when someone’s trying to lure me into the ocean.”

The siren huffed, trying to mask the faint smile tugging at the corner of his lips. Despite himself, he was fascinated by you, drawn to the way you spoke with him so freely, so kindly. You laughed easily, never shying away from the piercing looks he gave you.

One evening, after a particularly lengthy conversation, he found himself speaking without thinking. “If I weren’t trying to eat you, I’d probably find you quite… tolerable.”

“Oh, well, that’s just charming,” you snorted, shaking your head as you stood to leave. “I’ll see you tomorrow?”

Before he could even stop himself, he nodded.

Day by day, he waited for you on the shore, always with the same intentions, though lately they’ve softened. You had the same smile every time you saw him, that same laugh that had become strangely precious to him. The allure of his song had faltered, and he was left wondering why it was you, this human, who had broken it so easily.

Then one day, he asked, almost hesitantly, “You don’t ever feel scared… knowing what I am?”

You looked at him, a gentle smile spreading across your face. “Not really. If anything, I feel sorry for you. You’ve probably never had a real friend before, huh?”

He flinched, the words hitting deeper than they should have. You were right. And perhaps, for the first time, he understood why he waited on the shore for you.

So, on the days that followed, he didn’t try to lure you into the ocean or convince you to stay. Instead, he listened to your laughter and let your warmth keep him company, feeling that strange, unfamiliar comfort of being wanted for something beyond his power.