Honkai Star: Rail x Reader Oneshots

Lay Your Head, Rest Your Heart | Sampo, Aventurine x Dog Hybrid!Reader

Tags: Sampo x Reader, Aventurine x Reader, Dog Hybrid!Reader, Fluff, Found Family, Light Humor, Comfort, Slow-Burn Romance, Protective (?).

Warnings: Minor gambling references (Aventurine's part), Slight teasing and playful banter, Fluffy physical affection (ear ruffling, head pats, cuddling)

Sampo Koski

Sampo strolled through the bustling marketplace, his jacket fluttering with every smooth stride. His eyes gleamed with mischief, darting from stall to stall, calculating potential profits. Business was good, but it got even better when he had an adorable partner in crime—or, rather, a partner in occasional chaos. That partner was you, a loyal, dog hybrid who, despite your wagging tail and puppy-like energy, often brought him a surprising amount of good fortune.

“Sampo! Look at this!” you barked excitedly, holding up a shiny trinket you’d found at a nearby stall.

Sampo chuckled, running a gloved hand through his hair. “Nice find, pup. But remember, the best treasures aren’t the ones you buy—they’re the ones you ‘acquire.’” He winked, leaning down to ruffle your ears.

You scrunched your nose but didn’t argue. He had a point. Sampo always knew how to turn a simple situation into something profitable—or at least amusing.

The sun dipped below the horizon, painting the sky in hues of orange and purple. The marketplace had begun to quiet down, but the day’s adventures left you utterly exhausted. You let out a long yawn, your tail wagging lazily behind you.

Sampo glanced over, smirking. “Tired already? You’re supposed to be the energetic one!”

“Shut up.” you muttered, plopping down on a soft patch of grass.

Sampo joined you, leaning back on his elbows. “I’ve got to admit, you make the day a lot more interesting. Not every merchant can say their partner chased off a Silvermane Guard by barking at them like a mad pup.”

You grinned, your sharp teeth glinting in the fading light. “It worked, didn’t it?”

Before Sampo could reply, you crawled over and flopped onto him, your head resting against his chest. He froze, blinking in surprise.

“Uh…not that I mind, but what’s this about?” he asked, though his voice was softer than usual.

“Comfy...” you murmured, nuzzling into his jacket. Your ears twitched slightly, and your tail wagged a couple of times before going still.

Despite his teasing tone, he didn’t move. If anything, he adjusted his position to make sure you were comfortable, even if it meant lying awkwardly on the uneven ground.

As you drifted off, Sampo stared up at the starry sky, the usual glint of mischief in his mint-green eyes replaced with something softer. He reached out with a gloved hand, brushing a stray strand of hair from your face.

“You’re a weird one, you know that?” he whispered, though there was no malice in his tone—just quiet affection. “Not many people trust ol’ Sampo enough to sleep on me. Guess you’re either braver or crazier than the rest.”

The gentle rhythm of your breathing was his only response.

For once, Sampo didn’t think about profits or schemes. He simply lay there, enjoying the warmth of your presence and the rare tranquility that came with it.

“Guess I’ll let you off the hook this time,” he murmured, closing his eyes with a faint smile. “But don’t expect me to make this a habit, pup.”

Yet, even as he said it, he knew he wouldn’t mind if you did.

Aventurine

Aventurine adjusted his gold-rimmed glasses, their rose-tinted lenses catching the low light of the casino floor. The clinking of chips and the whirring of roulette wheels filled the air, but none of it distracted him. With a flourish, he placed his final bet on the roulette table, the corner of his mouth lifting in his signature confident smirk.

"Let’s make this one count." he murmured, leaning back as the wheel spun.

Beside him, you—his ever-loyal dog hybrid companion—sat cross-legged on a velvet bench, your tail wagging idly as you observed the chaos of the casino.

“Do you ever get tired of this?” you asked, your ears perking up as someone cheered in the distance.

Aventurine chuckled, turning his gaze towards you. “Tired? Of course not. The thrill of the gamble is what keeps life interesting, darling.”

You rolled your eyes but smiled nonetheless. “You and your dramatic flair.”

“Flair is what makes me charming.” he countered, his voice dripping with amusement.

As the roulette wheel slowed, the ball clicked into place. A chorus of gasps rippled through the table as Aventurine’s number came up. He leaned forward with a mock gasp of his own, gathering the chips with practiced ease.

“Would you look at that? Lady Luck smiles upon me once again.” he said, sending you a wink.

The casino emptied as the night wore on, leaving the two of you to wander back to Aventurine’s suite. It was as extravagant as one would expect from someone like him—gold accents, plush furniture, and a panoramic view of the glittering cityscape below.

You flopped onto the oversized couch, your tail thumping softly against the cushions. “I’m exhausted. How do you have so much energy after all that?”

Aventurine removed his choker, draping his coat over a nearby chair. “It’s all about pacing yourself. Though, if you’re tired, I suppose we could call it an early night.”

Aventurine removed his choker, draping his coat over a nearby chair. “It’s all about pacing yourself. Though, if you’re tired, I suppose we could call it an early night.”

He chuckled, grabbing a blanket from a nearby cabinet. “Fair enough.”

You watched as he settled into an armchair, his glasses perched on the edge of his nose as he sorted through the chips he’d won earlier. The sound of them clicking together was oddly soothing, lulling you into a sense of calm.

Before long, you found yourself sliding off the couch and padding over to him. Without a word, you curled up on his lap, your head resting against his chest.

Aventurine stiffened for a moment, caught off guard. “Comfortable, are we?” he asked, his tone a mix of amusement and fondness.

“Very...” you murmured, already half-asleep.

He sighed, a soft smile tugging at his lips as he draped the blanket over you both. His fingers absently brushed through your hair, his usual bravado replaced with quiet contentment.

“For someone who claims I’m ‘unbelievable,’ you seem to trust me an awful lot.” he mused, his voice low.

You didn’t respond, your breathing slow and steady as sleep claimed you.

Aventurine leaned back in his chair, his eyes softening as he gazed down at you. In all his years of gambling, scheming, and taking risks, he’d never expected to find someone who made him feel this… grounded.

“Not bad for a gambler’s companion...” he whispered, the usual sharpness in his voice replaced by something gentler.

The roulette of life kept spinning, but for now, he was content to stay right where he was—at least until morning.