Undertale Lemons

NAJ! Underfell Sans X Reader

~Requested by: dhghxgvhcfnshbbx this has been a requested chapter. I thank you for requesting this chapter. I don't know how good it will be considering that it I am doing this at 3:30 in the morning for me. But I still hope that you will like it. I do not own any of the characters from this au and I do not own you. This is for mature content only please.~

~No one's POV~

It was 5:30 in the morning on a school day. Y/N has gotten up early so she could take a shower before her first college class had started. She was getting some clothes together when she heard her phone buzz. She picked it up and looked at it the notification that came across her screen. It was a message from her friend, Frisk. The message said that Frisk might've gotten them into some trouble and that she should hurry over.

Frisk was always very kind towards her. She was grateful to have a friend like Frisk. She had recently changed schools and everyone has seemed so mean and vial. But Frisk was different. Frisk was a really sweet and kind person. When Y/N first moved she thought it would be a school full of all humans. But she was wrong. It was a school for monsters and humans. This made her even more nervous.

She knew monsters had powers. So she tried being cautious when making someone mad. She knew if she made a monster mad that they could easily kill her without even trying. Or at least that's what she was told. So it frightened her to be around monsters alone. So she always stayed around Frisk so she wouldn't be alone.

But she never imagined that a jock would cath her attention most. After replying to Frisk's text and taking a quick shower Y/N rushed over to Frisk's house. Frisk seemed to be up to something. But she couldn't quite place her finger on it.

Y/N's POV:

"Frisk, what's the emergency?" I had asked Frisk upon my arrival to her house. I knew she didn't speak much and liked to use sign language. Luckily I could read sign language. "Everything will be fine, Y/N. I promise. I just wanted to see how something looked on you. There is a group school picture today at school. Jocks and cheerleaders. Cheerleaders were allowed to have one friend come along. I chose you," she signed to me.

I looked at her slightly confused. I never really seemed to fit in anywhere. I didn't want to ruin her school picture. I never looked good in anything anyways. But I could never say no to Frisk. So I nodded my head. "What is it that you want me to wear, Frisk?" I asked, curious even though I know I won't like it a whole lot. But I know it will make her happy.

She pulled out a black dress with red designs all over it. It was absolutely stunning. I couldn't believe that she had something like this just sitting around in her closet.

I took it from her happily and put it on.

~Time skip because I'm getting side tracked with this~

We finally got to school and we both walked to the gym. All of the jocks and other cheerleaders were already there. We all got into spots and prepared to take the picture. It was my luck that I was standing next to a skeleton like monster. I think everyone said his name was Sans. I tried not to seem worried about it as I gave my best smile. Soon everyone left their spots and just started to hang out and talk. Before I knew it everything suddenly got dark and quiet. And it smelled like I was in some type of janitors closet.

I couldn't see anything at all. It was way too dark for me to see anything at all. But soon someone had locked the door and turned on a light. The person happened to be Sans. Frisk had told me that one nickname of his is red. I was barely able to choke out his name. I was nervous. I must have done something really wrong if he locked us alone together in a janitors closet. I could see how he grinned just slightly at seeing how nervous I was.

He soon got closer to me. I tensed up a bit because I had no idea what he was going to do. He then brushed his knuckles over my cheek before pushing some hair behind my ear. He slowly leaned in and smirked at me causing me to tightly close my eyes before he placed his teeth on my lips. This caused me to blush deeply.

No one's POV:

As Sans placed his teeth on Y/N's lips she blushed. She opened her eyes and looked at him for a whole moment before very slowly melting into the kiss. She was every bit of confused but she tried to enjoy the kiss. It was her first kiss after all. He then pinned her against the wall while pushing his body gently against hers so as to not squish her fragile little body.

He then moved down to her neck while leaving a trail of kisses. He then licked her neck slowly with his ecto-tongue earning a very quiet moan in response. He smirked to himself before gently bitting on her neck earning a slightly louder moan. Y/N was a blushing mess at this point. And he wad enjoying it.

He then used is magic to undress them both. As Y/N looked at him, with a face full of blush, she looked slightly towards his pelvis only to be met with a fairly large ecto-dick. Without saying anything, Sans turned off the closets light and picked her up. He sat down on a box and put her in his lap. He could feel how warm and wet her little pussy had become. That's how he knew she was ready enough for him to slip his already hard ecto-dick in.

He asked if she was ready and got a nod from her in response. He then started to slowly push his entire ecto-dick inside of her pussy causing her to tremble and moan from pain and from pleasure. After pushing in completely he let her adjust to his large size. After a few moments, Y/N moved her hips to let Sans know that it was okay for him to move. He smirked and began slowly thrusting in and out of her.

The pleasure slowly took over Y/N's small body causing her to moan as she begged for Sans to go faster but to also go harder. This caused him to blush but smirk as he squeezed her hips and pushed her down on him at a faster yet harder pace. This almost caused her to scream in pleasure but she just bit her bottom lip and moaned as quietly as possible.

She then felt him start to kiss, lick, and suck on her breasts. In return she started moaning out his name in absolute pleasure. She was in absolute bliss and couldn't even manage to be nervous anymore. She felt him pound deep into her womb causing her to get extremely tight on his hard ecto-dick causing it to twitch. They were both now really close to their climaxes. Sans Started bitting and sucking on Y/N's neck to leave a hickey.

After Y/N moaned out Sans' name before she had climaxed, sans had pulled out and came all over her stomach and chest. They both were panting heavily as they both came down from their climaxes. Sans used his magic to clean up the mess and get them both redressed as he laid his hed on her soft chest.

Sans' POV:

I have never felt that good before. It felt amazing. I just hope that she doesn't get too mad at me fir doing something like this with her. It wasn't exactly the most appropriate time. I looked up at her face to see how she was smiling brightly and it caused me to smile a bit. I think she might have actually enjoyed it as much as I did.

Y/N's POV:

I sighed with relief after finally managing to catch my breath and smiled. That actually felt amazing for my very first time. I felt how Sans had nuzzled his head on my chest and giggled lightly. I told him that it was time for our first class. Luckily we had the same first class together. He nodded and we both got up, leaving the closet as we walked to our first class together. We spent as much time together as possible after that.

(Word count: 1538 words in this entire chapter. Thanks for reading. Remember to leave more ideas for me to write on. Thanks again for the person who had requested this story. I hope that you like it. Sorry if it doesn't seem very dominant x submissive like. I'm not very good at writing like I used to be.)