Undertale AU Sans x Reader Oneshots

Fell Sans x Singer! Reader pt. 2

(Y/N) POV
Some time has passed and I got everyone out of the Underground. They were all so happy to be at the surface. I was still the music nerd but I only sang in front of Sans and Flowey. I haven't preformed in front of a crowd since I was 8 while I was performing for The Voice. In a few days there will be a party to celebrate the day they all came to the surface.

Right now I was in my house playing my guitar. I heard a knock on my door. I got up and walked to the door. I opened and saw Sans. "Hey Sans. What brings you here?" I say while moving out of the way so he can come in. "You know the party is coming up in a few days?" I nod and motion to keep going. "We will be at Grillby's. And we will be doing karaoke." He said quietly. I already know where this is going. "No I will not preform." I said to him in a childish tone. "C'mon this our party to celebrate for being here and you saving us from the Underground. At least preform for that night." He begged hoping you will change your mind. "I haven't preformed in front of a crowd since I was 8. I had more confidence back then." I said still sticking with my decision.

"C'mon can you at least do it for us. Besides I think everyone will love your voice. Please...(Y/N) do it for us." He said with a sad tone. My kindness got the best of me. "Fine..." I said quietly worried what the other monsters will think of my voice. "Thank you (Y/N). You should practice." He said with a smile on his face. "Can you go? I want it to be a surprise." I said quietly once again. He only nods and leaves. I close the door and walk back to the couch and continue to play my guitar.

The day of the party

I was dressing myself. I wore a (F/C) dress just above my knees. I wore (F/C) flats. I get my guitar and go to Grillby's. I park and get out of my car. I walk in and monsters were cheering. "There she is! Welcome (Y/N)!" They all said in unison. Papyrus, Undyne, Alphys, Toriel, Mettaton, MK, Blooky, Asgore, and Sans walk over to me. (Flowey is on your back). "Hello (Y/N). We can't thank you enough for getting us on the surface." Said Asgore. He looks like he is about to cry. "Asgore are you about to cry?!" Said Undyne clearly surprised. "N-No!" He stated clearly lying since everyone saw a tear. "Aw come here honey." Said Toriel sweetly. She hugged him. They left to go get drinks for themselves.

"He's gonna take her downtown." I said smirking while wiggling my eyebrows. Sans starts laughing. "What does that mean?" MK asks curiously. "You don't need to know kid." Said Undyne trying to hold in her laughter. Asgore and Toriel walk up to us very drunk. "I'm leaving with my *hic* my new boyfriend." Said Toriel. "H-e wa-was already y-your b-b-boyfriend." Alphys stated. She nods and they both leave. I look at Undyne, Alphys, Papyrus, Sans, MK, and Blooky wiggling my eyebrows once again. Papyrus, Undyne, Flowey, and Sans start laughing. Blooky leaves and goes to Shyren and MK looks very confused.

"Anyways...I'm starving." I said while holding my stomach. "LET'S GET SOME FOOD!" Yelled Papyrus. We all agree. We walk up to Grillby and order what we want. MK, Alphys, and Undyne are talking and eating. Papyrus and Flowey are talking. And me and Sans are talking. "So you gonna sing?" He asked. "If you can see my guitar case on my back then yeah I'm gonna sing." I said in a harsh way. He chuckles. We both eat. We then see Mettaton stand up where people will sing.

"Hello beauties and gentle-beauties. Today is our 1 year anniversary on being on the surface thanks to our lovely (Y/N). May you please come up here." He says motioning to come up. I got up and take my guitar out. "She helped us out of the Underground even though we were very...how I hate say it...rude. But she was so kind and got us out of there." He says while hugging me. They all start cheering.

"She will sing for us tonight. Even though the moon isn't out yet. Here you go." He hands me the microphone. "Before I start I just wanted to say thank you to all of you. You made my life more interesting. I have many great friends and I....I just love you all. Thank you for being friend's with me." I said I start tearing up. I can see everyone else tear up as well. "Ok. I will sing a song called "Diamonds". I sat down on a chair and lowered the microphone. I breathe in and out slowly. 'Here I go.'

Shine bright like a diamond
Shine bright like a diamond
Find light in the beautiful sea
I choose to be happy

You and I, you and I
We're like diamonds in the sky
You're a shooting star I see
A vision of ecstasy

When you hold me I'm alive,
We're like diamonds in the sky
I knew that we'd become right away
Oh, right away

At first, I felt the energy of sun rays
And I saw the life inside your eyes
So shine bright tonight, you and I
We're beautiful like diamonds in the sky

Eye to eye, so alive
We're beautiful like diamonds in the sky

Shine bright like a diamond x2
We're beautiful like diamonds in the sky
Palms rise to the universe
As we moonshine and molly

Feel the warmth, we'll never die
We're like diamonds in the sky
You're a shooting star I see
A vision of ecstasy

When you hold me, I'm alive
We're like diamonds in the sky
At first sight I felt the energy of sun rays

And I saw the life inside your eyes
So shine bright tonight, you and I
We're beautiful like diamonds in the sky
Eye to eye, so alive

We're beautiful like diamonds in the sky x2
So shine bright tonight
We're beautiful like diamonds in the sky

Shine bright like a diamond x5
We're beautiful like diamonds in the sky

Once you finished everyone cheered saying compliments like 'your voice is amazing' or 'you should be star'. I got off the stage. Sans hugged me. "You were amazing sweetheart." I blushed. "Thanks." I smiled. Do you want to do a duet?" I said with puppy dog eyes. He nods. We grabbed the microphones. He looked nervous. I give him a calming smile. He gains confidence.

"Ohh~ A duo. Well go on." Said Mettaton.

(I'm lazy)

We finished and everyone cheeeing like crazy. "I ship it!" I heard Undyne yell. I blush by that. I'm guessing Sans heard too since he is blushing too. We leave the stage. Other monsters start singing.

"(Y/N) do you want to watch the sunset with me?" He asked a bit nervous. Which gets me confused why. "Sure." I Said smiling. He takes my hand and we go outside. We walk to a bench that gives us a perfect view of the sunset.

Sans' POV
Her eyes sparkle when she sees the sunset. She looks so beautiful~ I love everything about her. I have to tell her. "(Y-Y/N) can I ask you something?" Damn it I stuttered. "Sure tell me anything." She said smiling and looking at me. Her (H/L) (H/C) blew in the wind. Her (E/C) eyes sparkles like the stars but her eyes are more beautiful than the stars.

"I have been meaning to tell you this for awhile....I know I was very rude to you from the start but when you befriended me I felt my SOUL flutter. When I got to know you better you seemed to be like a wonderful person. You still are. When I heard you sing I fell for you even more. So what I an trying to say is I love you (Y/N) and will you be my girlfriend?" I asked with worry if she will say yes.

I saw her crying and nodding her head. "I felt the same but you saying all of that made me even more happier. I love you too Sans and I will be your girlfriend." She hugged me. I wiped her tears away. She looked at me with her beautiful eyes. Then she kissed me. I immediately kiss back. The kiss turned into a make-out session which I don't mind~

She pulled away. Why (Y/N) why?! "Look at the sky." She pointed to the sky. There were millions of stars. "Aren't they beautiful Sans?" She said with such wonder in her eyes. "They are but you are more beautiful. You shine brighter than the stars in the sky." She blushes. She cuddles next to me. We both cuddle and look at the sky. "You are my Star..." I said quietly enjoying this moment.

I'm done hoped you enjoyed this. Still taking requests so go wild.