Sans AU One-Shots

❀Killer, Dust❀ || bitter.

This was inspired by various songs, such as ^

Pairing: Killer Sans x Female Reader -> Dusttale Sans x Female Reader (you'll understand when you read)
Prompt: With the grace of a freight train, you're bulldozed with sudden feelings for the guy you've been sleeping with under a friends-with-benefits arrangement.
Type: smut
Length: 6k words
Background: You've been in a friends-with-benefits relationship with Killer for some time, meaning you've been around Nightmare's castle a lot.
Notes: I've been seeing a lot of art by a particular creator that depicts Killer and Dust as addicts so that definitely influenced my writing. If you don't personally headcanon them as drinkers/smokers, apologies, but I could definitely see it as something they'd do to avoid feelings (like everyone irl does) knowing their backstories. So, warning for drinking, smoking, and general mature content. I typically skirt around the specifics of the topics included in these ❀smut-shots❀ (ex. I never outright use the word 'sex') but I didn't do that this time, taking on a more realistic/blunt approach to the whole thing - in other words, you might wanna make sure you're alone if you're reading this... 

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The line between friends and something more was a thin, blurry one. Well, at least it was to me. The arrangement I had with Killer was somewhere along that line, over it or short of it I could never tell, but I was okay never knowing. If I didn't think about it, it could remain as it was: friends-with-benefits, and there were a lot of benefits.

But life was never that simple, was it? Because before I knew it, he wasn't just a close friend I occasionally had sex with, he was...something more. And the slope between friends and something more was just as slippery as the line was blurry, so with the grace of a freight train, the realization hit me in the gut over something as mundane as hearing Killer call for me, leaned against the doorway to his room as he bit his lip, empty sockets running over my body as I lay draped over his bed.

We had just finished- well, he had just finished in me, coaxing me across that finish line in that deep, husky voice he loved to turn me on with, using dirty quips he had in abundance and skillful hands. He had left to the bathroom to clean up as I caught my breath, wondering why I was still feeling the high when he came back, leaned against the doorway as he wiped his hands on a towel, and whistled. "Have I ever told you how damn good you look like that, darling?" That stupid nickname, it spurred butterflies to life in my stomach in a way it never had – he moaned that petname while he was balls deep in me, but when he was simply flirting with me after the fact, that's when it made a whole new feeling envelop me that caused my breath to hitch and my cheeks to redden, and I pulled the sheets of his bed over me to cover my exposed body.

"I believe you have." The normally smooth reply came out nervous, and I had to take a second to continue with a flirty wink. "Typically when I'm moaning your name as you're fucking my brains out."

"That is when you look best." He tossed the towel over his shoulder as he walked over to me, trailing his eyes up the little exposed skin he could see.

"You must be used to that." It was more of a reminder to myself that this wasn't exclusive, that he likely had a harem of girls at his beck and call, and that the feelings I was just coming to grips with should be squashed while I still had the chance.

"When I'm with you?" He smirked, radiating pure cockiness as he swept back hair he didn't have with a playful wink. "Absolutely."

"I noticed you don't moan my name." It was a fact I noticed early on but never mentioned, not caring that he always let out a 'darling' or 'baby' in its place until just now. To be fair, 'Killer' just slipped out in the heat of the moment, as he was the only thing I could focus on so it was all I could think to say outside of my breathless moans.