You changed me and I changed you (Underfell x Reader)

6.Let's have a GOOD time

A/N Lemon warning. Enjoy!

Sans woke up and saw that y/n was standing next to the door. "Hey where do you think you're going!" he snapped in a whisper, you could also tell he wasn't a person who wanted to be awakened, especially at this hour. He was pissed.

"Pet!"

Sans used his magic and slammed me down to the floor.

"Sa-Master, I can explain". Y/n said in a frightened voice. Sans sat up in the bed and yanked y/n leash, she winched as he dragged her towards the edge of the bed. Y/n shakily placed her hands on the edge of the bed and up to a sitting position, She didn't wanna look at Sans, he was pissed and growled.

Sans pov

"Bad dog. Let's have a good time, shall we!" My eye was glowing bright crimson red and as I used my magic to throw y/n, face first on the bed, I heard her yelp. I got some cuffs out from a box under my bed, got on top of her and cuffed her wrists to the bed. I also placed a gag over her mouth. "This way my brother won't wake up, wouldn't wanna catch him in a really bad mood at this hour". Y/N was struggling a bit. I slapped her butt and removed her underpants. "The more you struggle, the more painful and deeper I'll go." I said with an evil grin

Y/N pov

(Hand cuffs again, my poor wrists).I thought to myself. (Is he gonna whip and slap my butt, til its purple or wait... Is he gonna do what I think he is doing...How?.. How can he do that?) This skeleton sure has a lot of surprises, this one, however, in his pants... Sans slapped me again, which cut me from my thoughts. Sans placed one hand on my back and one on my hip, as he thrusted his erection, I gasped and tugged at my cuffs. His motion was hard and fast. I muffled a moan, I knew he heard it and just chuckled. My hips moved in sync with his thrusting, but he suddenly changed the rhythm, hard and fast, the ones he thrusted deeper, I couldn't predict. I groaned and muffled a scream. Sans slapped my butt again. That's gonna be bruised at the end.

"Aah baby, almost there." He dug his hand in my back, I arched my back, but received an other slap. One more deep thrust and sans realized. I heard him panting, pulled out and uncuffed my hands.

Sans pov:

*pant* *pant* Huff.. "Hehe." I leaned down and whispered into Y/n' ear. "We're not done yet". I held a tight grip on the leash and put the cuffs away. I beckoned y/n to get off the bed and kneel down. I removed the gag, and as I did y/n was breathing heavily. This time she's gonna be blindfolded. I placed a hand on her cheek: "This is your punishment sweetheart".

"M-master one question,please? Y/N said a bit nervously, as she was kneeling down in front of me (how cute). I shrugged and placed the blindfold on her.

"Fine."

"H-how did you do t-that?"

I leaned closer. "Magic baby, now open your mouth." I went in for a tongue kiss. (I'm such a tease.)

Y/N pov

That kiss was unexpected, but it had a calming effect on you. I took the member in hesitantly in the beginning, I mean it's a magic dick..Sans had a hand behind your head and forcing his magic dick in you. I got used to his rhythm. Your curiosity kicked in and at a few moments where Sans slowed down his thrusting you decided to add your teeth on the member as you pulled out and in. Sans gasped, he didn't expect that. He growled and moaned your name. You placed your teeth on it again but as you pulled out you licked it. You felt that you were in control only for a moment. Sans grabbed you (hair/color) hair and shoved his dick in your mouth again. Thrusted deeper and moaned. As he was about to cum, Sans released his grip on your hair and you pulled out. The cum sprayed mostly on the floor and a little on you. I removed the blindfold and saw Sans lay down on his bed and breathing heavily. As you wiped the cum of your face, you heard stomping approaching. In the next moment, the door flew open making you jump. It was Papyrus and he was holding a bone threatening.

SANS YOU FUCKING NUMBSKULL!!! You have the nerve to fuck in the middle of the god damn night!! He yelled pointing the bone at Sans.

S-soorry b-boss. *gulp*. I was just giving my pet a punishment and having a great time. Sans's voice turned instantly went to nervous and again with the boss name. Papyrus crossed his arms and looked first at Sans sweating like crazy and then at Y/n, who was naked.

"A great time eh..... We're gonna talk about this later Sans. AND CLEAN UP THIS MESS!!! Hmpf." Papyrus slammed the door behind him. Why do I have a bad feeling about what's gonna happen...

A/N I'm a sinner. xD More to come later on. Or the next ;-) *Cliffhanger*