~Lusting~ Undertale X Reader Oneshots

{SMUT} Lust!Sans X Male!Reader

// reader is Frisk ig, hella gay, thats it

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The door to the Ruins swung shut behind you, closing with an ominous thump. There was no going back, even if you wanted to- the door was made out of solid stone and had no grips from this side.

Strangely, as your eyes adjusted to the light, snowflakes drifted down around you. Even stranger, you didn't feel cold at all, despite the entirety of the forest ahead of you being covered in snow.

You walked until you reached a bridge, supported by some strange cage setup that was way too wide. Suddenly, you realized someone was standing behind you.

"Human."

"Don't you know how to greet a new pal?" the figure asked.

"Turn around and shake my hand."

Reluctantly, you turned, reaching out slowly for the monster's extended arm.

He stepped into the light.

"i'm just messin' with ya. the name's sans. sans the skeleton. and what kinda name goes with a face as cute as yours?~" he asked.

"(Y/N)," you said, blushing. Despite having already traversed the Ruins, it was still going to take a while to get used to everybody you met flirting with you.

The skeleton's revealing outfit consisted of an open sleeveless jacket embroidered with a heart, and a pair of black jeans with teal boots. Despite lacking skin, he seemed to have hips.

Sans noticed you eyeing him and smirked. "like what you see? we can get a little more intimate if you want~"

You nodded, blushing slightly. You couldn't help but wonder how a skeleton had sex, but it seemed like you were about to find out.

Sans took your arm and led you to a guard station a few feet away. He pressed you against it, and to your surprise, a purple tongue came out of his mouth. He kissed you and rubbed his crotch against yours.

He pulled off his shoes and pants, casting them aside. His entire lower body was now covered in magic skin, including a glowing dick.

The skeleton wasted no time taking off your shirt and pulling down your pants. Your boxers were already in poor shape from the Ruins, and they barely covered your erection.

Sans took your dick into his mouth- it was unlike any blowjob you'd ever had. You felt incredibly horny.

Anticipating the lust his magic brought on, Sans prepared himself and dug his knees into the snow. He had hardly any time before you were fucking his mouth at full force- you sure knew how to use your cock.

He tried his best to work his tongue around your length. Usually it was easy to control his partners when they were affected by his magic, but it seemed like you were just too lustful. Maybe when you'd calmed down a little, he could take control again. In the meantime, he had to admit humans tasted good.

You thrusted hard into Sans's mouth, feeling his tongue touch your length. You could tell he loved the taste; his eyes had turned into little hearts, and he was bobbing up and down on your dick like it was chocolate.

But you didn't- you couldn't- take it slow. Something about him just made you so incredibly horny- you'd have to at least finish in him before you could slow down.

Moaning around your cock, Sans eagerly swallowed your first load. It was warm, creamy, and he could feel you shudder as you thrusted it into him.

Swallowing, Sans stood up, turned around and bent over in front of you, showing off his ass. You needed no instruction. You quickly got back on track pounding into the skeleton's other hole, watching his own dick bounce and throb as you fucked him.

He could feel you pumping in and out of his ass. You hadn't slowed down at all- if anything, it seemed that release had just encouraged you. He moaned loudly, feeling the cum-coated dick penetrate him.

You could faintly see your own dick buried in his ectoplasm, moving inside him and shaping his insides. It was fascinating to watch.

Sans could tell you were watching yourself inside him now. How self-centered. He'd just have to get your attention again.

Suddenly, Sans flipped you onto the ground so he was in cowboy position. Despite your never-ending libido, you had to admit your body was getting tired and welcomed the change of pace.

He started to ride you, taking you in all the way while his dick bulged against your chest, dripping precum. Sans thrusted forward and down at the same time, and you could feel his ass tightening. He smirked, pulling open his jacket with one hand and slowly masturbating at the same time.

"you like me riding you like this, huh? watching me fuck myself with your dick?"

You could feel his movements growing faster and hungrier. You were close again, too, and watching Sans bounce up and down on you, moaning, letting you see the full view of your dick penetrating him-

"Ah! Oh fuck! I'm gonna-"

"do it! fill me with your seed!"

As he came down on you, you thrusted upwards into him and came again, releasing your second load into him. Feeling the warmth flow through his body, Sans moaned even louder than before, welcoming you into his ass. 

With his own burst of lust, Sans came too, cock pulsing as he sprayed his cum all over you.

You sat there for a few seconds, breathing heavily. Watching your semen flow around inside Sans's body, exploring every inch of him. 

He stood up, not dripping any of your load onto the ground. He wanted to make sure it stayed where it belonged. Inside him.

He pulled up his pants and offered you a hand.

"Sorry, I... got really carried away..."

Sans smirked. "don't mention it, kid. you were hot back there. still are, actually. now get your pretty ass movin' or i'll start filling up yours like you did with mine."

You took his hand and stood up, zipping up your pants. "I don't think I'd really mind that much."