bad to the bone (Undertale sans x reader)

Accusation

Sans watches as you groan and cry out, arching your back and gripping your pillow in your sleep. You've been having nightmares for awhile now, but he's never seen you this bad before. You had gritted your teeth, tears streaming down your face, kicking your legs and making noises, as if you were in pain.

He didn't like to see you like this at all

"Hey, Y/N, wake up." He whispers, shaking you.

But that only made you worse. You screamed out in pain as soon as his bony hand touched you. 

"Ah!! No!! Please!!!" You scream, tears of red blood trailing down your face.

Sans gasps, his eye glowing brightly. Why is she bleeding?!  He grabs you and shakes you violently, grabbing a cup of water and looking at you, you arching your back, kicking more. 

"Ah!! It hurts, stop!!!" You scream once more, tears falling down your face, mixed with blood as you gripped the sheets.

Sans watches you and you fall silent, motionless. Your chest begins to glow brightly, making his eyes widen and cup into his senses as he splashes your face with water.

"Wake up!" He yells, dropping the cup and taking a step back, making sure not to touch you. 

You sit up, coughing up blood mixed in with water. You cry out in pain, holding your chest, your eyes rolling into the back of your head, your head facing the ceiling, blood pouring from your mouth. 

"PAPYRUS, METTATON! GET IN HERE QUICK!!!" Sans screeches through the door. 

The door slams open, the two running in a full speed. They caught eyes with your frame, blood dripping down it ever so slowly. 

"Sans what happened?" Papyrus asked, looking at your trembling body.

"I-I don't know! Her nightmares get worse and worse!" Sans replies, lifting you up.

Mettaton takes you, holding you bridal style. He stares at your face, blood dripping onto the floorboards.

"Take her to Alphys!" Sans yells.

"Sans, I'm not sure that's a good idea. You know what happened last time she worked on a patient. I'll take her to a real hospital." Mtt says, rushing out.

Papyrus looks at Sans, silence surrounding them. He turns to his older brother. 

"What did you do?" He asks, squinting.

Sans looks around, clearly confused.

"What are you talking about?"

Papyrus walks closer to him.

"Sans, don't play games with me. I saw her chest glow, I saw the blood, I saw the way she held her chest in pain." He says, leaning down to Sans's height.

Sans look down, not making eye contact with his brother. 

"Yeah I saw it too, why?" He ask.

Papyrus grabs Sans's collar, lifting him off the ground slightly. 

"Don't play games with me, Sans. You can't fool me, I know my own brother." He growls.

Sans walks backwards, pulling out of his brothers grip, his eye glowing.

"What are you saying? I didn't do anything bro!" Sans says, backing up.

"SANS!!" Papyrus roars.

Sans backs up into a wall, his brothers eyes glowing orange, large bones appearing behind him.

"SANS ANSWER ME, OR SO HELP ME-" He roars, the bones lifting up, aiming at the smaller skele-bro. 

"PAPYRUS!!!"

They both look at the door, seeing Undyne.

"U-Undyne?" Papyrus gasps. 

She pushes Papy out of the way, grabbing Sans by the neck of his sweater, pulling him up to her height.

"You midget skeleton WHAT THE HELL DID YOU DO TO HER?!? I SAW HER, COVERED IN BLOOD, HER SOUL GLOWING IN METTATONS ARMS, SICK PERVERT!!" She screams in his face.

Sans stares with wide eyes.

"I-I-" he chokes on his words.

"Sans?" Came a light voice.

They turn and see the queen of the underground herself. 

"T-Tori!" Sans smiles weakly, Undyne dropping him.

"Sans, what did you do to Y/N?" Toriel asks, tears brimming her eyes.

Sans backs up. Everyone was accusing him. They seemed to know what they were talking about. 

"I...I don't know what you guys are talking about...I didn't do...anything..." He says, backing up.

"You're lying Sans." Papyrus frowns.

Sans looks around nervously, ducking in only his closet. He slams the door shut, backing up into the sweaters he owned. They all immediately going after him and opening it.

When they looked in the small space, he wasn't anywhere to be seen.