Honkai Star: Rail x Reader Oneshots

Between Crumbs and Cataclysms | Aventurine, Kafka, Boothill x Demon!Reader

Tags: Aventurine x Reader, Kafka x Reader, Boothill x Reader, Demon!Reader, Dark Humor, Unlikely Allies, Chaos, Casual Destruction, Snarky, Found Respect, Morally Grey.

Warnings: Mild language, implied violence, destruction, morally ambiguous themes.

Aventurine

Aventurine stood at the edge of the casino’s grand balcony, the lights of the city sprawling beneath him like a sea of fireflies. The world always seemed like a gamble to him, a constant series of risks and rewards. But tonight, something felt… different.

His eyes narrowed as he observed the chaos unfolding below. The sounds of screams, explosions, and destruction rippled through the air, and in the middle of it all, a figure stood, casually munching on a bag of snacks—each bite taken with the same lackadaisical ease as if the entire galaxy's fate wasn't hanging in the balance.

Aventurine tilted his head, intrigued. He'd heard the rumors—whispers of a demon who devoured everything in sight, a being representing the sin of gluttony, one whose wrath could raze cities and whose casual disregard for destruction had become the stuff of legends. He’d even heard people call you an overlord.

But the image he’d built in his mind was not what he saw before him. You weren’t the terrifying monster that stories made you out to be. You were just… eating chips.

“What a spectacle,” Aventurine muttered under his breath, his usual flair for dramatic commentary giving way to something closer to genuine curiosity. He adjusted his blazer, ensuring his gold-lined roulette imagery caught the moonlight just right. His instincts told him you weren’t simply here for the chaos; there was something deeper to your presence.

He stepped forward with purpose, his polished black shoes clicking against the stone floor. As he approached, your gaze lifted, your eyes barely flicking over to him before you went back to chewing.

“Don't mind me,” you said casually, your voice rich with an uninterested tone. "I'm just having a snack."

Aventurine smirked, unable to hide the gleam of fascination in his eyes. He had seen many things in his life—risks, gambles, grand gestures—but nothing quite like you. You didn’t seem interested in his persona, his theatrics, or even his title as one of the Ten Stonehearts. To you, he was just another person in the chaos of the universe.

“Quite the appetite you have,” he remarked, still studying you as you reached into your snack bag for another handful. “Tell me, is this your idea of a… victory feast?”

You shrugged, not even bothering to look up from your snacks. "Victory? Nah. Just satisfying a craving, y'know? Got a lot of pent-up frustration and hunger. So, I'm making sure I don't go overboard this time."

Aventurine couldn't help but raise an eyebrow. “Pent-up frustration… So, what’s the gamble here? The city? Your snack supply?”

You smirked, a little amusement flickering in your eyes. "Nah. The gamble is whether or not people can learn not to cross me. It’s more fun when they think I’m some overlord trying to destroy everything. It gets the right kind of attention. Besides,” you added with a devil-may-care grin, “it lets me prove a point.”

He watched as you carelessly tossed a half-eaten bag of chips into the air, watching it explode in a cloud of crumbs as it collided with the side of a building. He chuckled softly. You didn’t act like an overlord, you probably were an overlord.

“You know, if you ever considered not throwing tantrums, you could be a dangerous ally,” Aventurine mused, his voice laced with interest. “But, of course, you enjoy keeping them guessing.”