Undertale X Reader Lemons and Limes

Jealousy (DomUnderfell Sans x Reader Lemon Part 1)

A/N: Hey guys just another warning. Do not read if you're sensitive to suggestive themes, and sex-u-al content~ ... In other words. More sin writing! I realized that my first lemon had a lot of spelling mistakes. And I lazily spaced the paragraphs. I might fix that..  I wrote in in a little over two hours, and it was 4 in the morning or something when I posted it so I was very tired. I hope this one turns out well. I was originally gonna write some fluff buuuut. Nah, this was a request multiple times so wtf not?

Btw. I must warn you this is a very sadistic Sans we're talking about. Meaning rough sex, violent sex, and hardcore kinks... ish... Ya.. You have be warned. You're still able to turn back. This was a half assed job of the first part of this lemon. Cause I'm too lazy to write it all in one.
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He came into the bedroom, slamming the door onto the wall as he looked at you with a fearsome glare. His hand was still on the door when you jumped and looked up at him. You had been writing in your journal went he suddenly startled you by barging in like this. The grip on the pen you held tightened, and you nothing as your eyes locked with his.

It was like this for a few moments. Not a word shared between wither of you.

".. Sans?" You asked in a soft voice, but it was like your voice had set him off.

"Fuck!" He yelled and came into the room, shoving the door closed with more force then needed. You jumped, and put your journal and pen down, closing the book upon the pen hastily where you had left off. "S-Sans? What's wrong?" You went push yourself off the bed, but found yourself sinking further into it when the skeleton's red magic launched his desk off the ground and into the wall opposite from you. Paper, and pencils, and the two drawers in the desk went flying everywhere, and onto the ground.

Something had made him very angry, and you knew from experience not to taunt his anger, or push him any further into these fits while he was having them. Your mouth was slightly agape, and your eyes were just wide as you watched him silently.

His left eye was flaming red, and his teeth were shown in an angry snarl, instead of his usual mischievous grin. He was muttering a necklace of words under his mouth, looping them over, and only adding onto his chain of curses he walked over to where the desk had been, and kicked the fallen drawer out of his way.

After getting that out of his system, he groaned in annoyance and rubbed his face. "Stop starin' at me like that there ain't nothin to see." He snapped. Without even glancing at you he knew what your expression looked liked.

Shocked, a little frightened. You wanted to move away from him and leave the room.

When you told him you were going to go do something, in the gentlest way you could. His gaze turned to you. His stare was cold, and annoyed. Daring you to get up and walk out of the room. You looked at the door, away from him again, and just lowered your body back down onto the bed, with a meek, "Never mind."

Sans wasn't in a good mood right now. Not after what he had just dealt with. Sooner or later you were going to find out too, and that just pissed him off more. He knew you hated it when he got into fights, but recently he'd been doing better to not be the one starting them.

But not this time. He could look at it any way he wanted.

They way they had been talking about Underground's human. Boasting about what they'd do to your body if they had you. How many sick fantasies that had made up. That had really set him off.

He had thrown the first punch yes, but they were the ones spitting shit around the wrong guy.

You were his. And his only.