Sans AU One-Shots

Killer, Cross❀ || knight & princess.

Pairing: Killer Sans x Female Reader -->> Xtale/Cross Sans x Female Reader
Prompt: Y/n is in love with fairytales of handsome knights whisking princesses away to a happily ever after, but after growing up and realizing life isn't like the fairytales in books, she grounds her feet in reality and finds herself the sometimes dirty but always immature Killer instead of someone decorated with armor. Her only gripe is that Killer's immaturity seems downright childish compared to the Royal Guard Cross, who draws her attention more than she'd like to admit. Something in the way he carries himself reminds her of those knights she loves, but he's stern, cold, and uninterested in everyone else in Nightmare's castle, and Y/n wouldn't leave Killer no matter how annoying his immaturity gets.
Type: long story with spicy convo throughout & spice at the end
Length: 17k words
Background: Includes references to Cross' backstory, as usual, though I don't exactly iron out what happened after the events of the X-Event in Xtale
Notes: Requested by a lovely reader. | Are you prepared for an emotional rollercoaster where the characters can't make up their mind? :D Cuz that's what you're gonna get with the latest installment of 'how long can I make a one-shot until it's classified as a short story?'! You know I can't make these short, it's a medical condition (yeah, they said it was terminal :/ ).

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"The face she made was straight out of a porno, dude. You should've heard her. You'd be waking up stiff for weeks!" Cross nearly came to a halt with his foot halfway through the door at the discussion on the other side, and he heaved a silent sigh as Killer went on to the chuckles of his companions. "She gave shit head - I'll have to give her plenty of practice - but she was a good fuck and she practically foamed at the mouth when she saw what I was packing, so I know she's eagerly waiting for another round." Cross walked into view, teeth twisted into a scowl he did nothing to hide as Dust and Horror glanced up with widening permagrins. Killer met his white eyelights and saluted with his knife, twirling it in his hand as he leaned against the furthest wall wearing a cocky smirk. "Good timing, Crossy! I was getting to the best part."

"I don't care about your sexual escapades, Killer." Cross' tone was biting, on the verge of snapping into outright anger despite his experienced techniques in keeping his cool.

"Oh come on, we've been over this!" Killer skipped over, attempting to reach out to pat Cross on the head with his free hand, but the Royal Guard sidestepped and snatched his wrist and twisted. The killer brought his knife down on Cross' arm to force him to let go but Cross stepped away before the blow landed, causing a heavy silence to descend on the room as the two glared at each other.

Cross' hands fell to his twin daggers hanging at his hips, resting on the hilt to appear calm when he was anything but. "I highly doubt (Y/n) would feel comfortable knowing you are talking about her like this."

"What she doesn't know, won't hurt her - like I've told you." Killer rolled his head, the knife coming to life in his hand once more as he leaned back on his heels. "Besides, it really isn't her business this time." Cross' sockets narrowed at that, but Killer shoved his way past him. "So, other than coming to ruin our fun because you don't know how to let loose-" Killer glanced back with a mock pout. "-or how to handle a joke-" Cross bit back a snarl. "-why are you here?"

"The Boss needs us for a mission." He wouldn't be here otherwise - despite Killer's love of toting around his extracurricular activities, not everyone loved hearing about them. Cross did his utmost to avoid storytime, but he'd heard more about (Y/n) and Killer's bedroom life than the girl would likely ever know - a fact he was blatantly uncomfortable with.

Killer let out a whine, throwing his head back like a child that had its favorite toy taken away, and Dust and Horror got to their feet to follow after the pair in the direction of Nightmare's office. "You always ruin the fun on these missions! Why can't you stay at home and guard the castle?"