yashachan
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A Relationship That Burns, Bruises, And Breathes Lust by yashachan
Fandoms: Undertale (Video Game)
03 Aug 2025
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Summary
You and Sans are a filthy addiction wrapped in obsession. You’re short, bratty, porcelain-soft, all gloss and tease—he’s 6'5", all bulk and bone, built to pin her down and fuck her stupid. You two fight constantly, but can’t keep your hands off each other. Three times is a day minimum by the way, more if you purr. He’s possessive, huge, and never gentle—ruins you every time with those big, boney hands. You taunt, whine, beg; he growls, bites, fills you until your thighs malfunction. Your relationship isn’t soft—it’s loud, messy, soaked in sweat, jealousy, and need. He marks you like property, and you wear it proudly. You were made to wreck each other, and you do. Over and over.
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Summary
A truce between two powerful mafia families. One contract. Two unwilling signatures.
Sans Gaster never thought he'd be the type to get married—especially not to some brat signed off like cargo to settle a blood-stained deal. But when his brother, Wingdings, forces his hand in the name of power and peace, Sans finds himself betrothed to a porcelain doll with a mouth sharp enough to stab.
Yoru Felidae is nineteen, furious, and absolutely done with everyone’s shit. Forced into a dress, a role, and a marriage she never asked for, she refuses to go down without a fight—even if her new husband looks like he eats bullets for breakfast and talks like every sentence ends in a threat.
Their first meeting? A disaster. Their families? Watching. The clause? Bear one child—and the contract is over.
But nothing’s ever that simple.
As loyalties blur and tempers flare, Sans and Yoru must navigate the minefield of violence, politics, and buried trauma that binds their two families. And somewhere between hatred and survival… something unexpected might start to grow.
She’s a doll made of rage. He’s a devil in a suit.
And neither of them are ready for what comes next.
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Summary
You’re running from two things: a family that smothers you like bad leftovers and a psycho ex who’s probably one restraining order away from a fucking Netflix documentary. Desperate for cash and distance, you land a job that seems too good to be true: free room, free board, and great pay. The catch? You’ll be working for a family of literal skeletons.
Papyrus is strict as fuck, but it’s still manageable. But then there’s Sans—his lazy, smug brother with a grin that screams trouble. He’s constantly invading your space, dropping cryptic one-liners, and making “dollface” sound more like a warning than a compliment. Now, you’re stuck wondering if this gig is your big break or just another shitstorm wrapped in a paycheck.
Wrote this dumpster at 3 a.m., powered by bad decisions and caffeine. I’m tired, cranky, and seriously considering why Sans is basically the human embodiment of my last bad date. Time to sleep (or cry). Goodnight! <3
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All about Us [Mafiafell Sans x Original Character Oneshots] by yashachan
Fandoms: Undertale (Video Game)
22 Dec 2024
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Summary
This is a one-shot fanfiction featuring Mafiafell Sans and my original character, Yoru Felidae—or more accurately, a self-insert version of myself. I couldn’t resist the urge to create a story about him and me because I absolutely FUCK with this character.
While Yoru might not be a relatable character for everyone, as her specific body type, skin color, eye color, and hairstyle are detailed in the story, I hope you’ll still enjoy reading it. I wrote this purely for fun, but having someone else read it would mean so much to me.
Thank you, and happy reading!
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Summary
NSFW ahead! Ignore if you are 18 below, and read with caution!
This story/oneshot takes place in my Kingdom, Zhonglisballsack. Some might not, but majority are. Also this AU is held between human version of Cookierun characters.
I hope you enjoy!