I taco 'bout you - Underswap Sans x Reader

Chapter 17

You and Papyrus go to Muffets first. Muffet instantly puts a bottle of honey on the counter when she sees how he is with his eye glowing brightly.
He grunts in thanks and picks it up instantly, drinking it like it was a soda.
You scrunch your face up.
"I dont get how you can drink that stuff." You mutter
Muffet giggles and puts her elbows on the table.
"So whats up with you two?~" she asks in her usual tone. You sigh.
"Someone took Sans... And I think me and Papyru knows who it is.
"Ahuhuhu~ If you two need any help i'll be happy to!" She smiled and went back to working.
Papyrus sighed. His voice sounded a little lower than usual.
"Lets just go find him."
He muttered under his breath so Y/N couldn't hear,
"And if they hurt him, they're gonna have a bad time..."
You glance up at him and then stand up.
"Alright... Muffet can I have a F/D?" (favorite drink)
Muffet shrugs "Sorry! Ahuhu~ were all out. How about 2/F/D?"
You nod "Sure."
You gladly take it and drink half of it in one go.
You wipe your face with your sleeve and sigh.
"Alright... Lets go to Undynes."
Papyrus nods and gets up, teleporting there.
The lab was completely trashed, papers thrown everywhere, a note written on the wall that had the creepiest smiley face...
You look at Papyrus, he even seemed a bit unnerved.
"I... Don't know what happened here..." He looked around.
You noticed a metal and yellow glint from upstairs and dash up. Alphys was passed out on the ground.
"I found Alphys!" You call down to Papyrus. He teleported up and looked down at her.
"Alright. Well... Is she alive?"
You nod and shake her a little
She grumbles and then jumps up.
"AGH! You guys?"
She looks at you and Papyrus surprised.
"Asriel, he was here. He attacked Undyne and I tried to help but he almost killed me." She put her head down in shame.
You pat her back reassuringly
"Its okay Alphys, we'll find Undyne and Sans."
Alphys sighed
"I was at Mettatons show when it happened, Undyne called basically screaming..."
She recalled the memory...

"ALPHYS!" Undyne screamed into the phone
"THERES A PROBLEM IN THE LAB! ASRIEL-" the phone cut off.
Alphys jumped up and grabbed her axe, dashing to the lab.
When she got there the whole place was destroyed like how it was now. She looked around frantically.
"Alphys Alphys Alphys... You don't get it. Do you?" Asriel came out. He wasn't the little kid as everyone knew him now. He was a determined maniac.
Alphys glared at him
"GET WHAT?!" She snapped angrily.
Asriel smiled.
"I'm just taking the ones that they like the best.... To get them to come to me."
Alphys stared at him.
"What?" She shook her head.
"NEVERMIND! GIVE ME BACK UNDYNE!" Alphys dashed at Asriel and he flung her against the wall with a chaos saber. She slid down the wall and jumped up again, dashing at him.
The process was repeated until he finally used his star attack and she passed out.

Alphys snapped out of her daze, You and Papyrus were watching her worriedly.
"Alright... Do you have an idea where he is?" You ask Alphys.
Papyrus nods.
"I do."
You and Alphys both look up at him.
"Wheres Sans' favorite spot?"
You suddenly jump up.
"Top of the waterfalls." You instantly say.
Papyrus nods.
"Aand since Sans and Undyne both dislike heat?"
You realize where hes going with this. Literally.

The center of the core.