(Basically I'm inspired so yeah. -w-
What I heard is that everything is the same in that AU. But Sans relationship is different with papyrus. Basically Sans acts like a jerk and leaves all his stress and weight onto papyrus. Papyrus wants him to be happy so he doesn't stand up. I don't know if he does this without realizing or on purpose. I don't really know the backstory but this is all I know.
Your POV
You walked towards snowdin to the barricade. "Do you know how to greet an old pal?" You felt shivers down your spine.
"Turn around and shake my hand." You turned and shook Sans hand. A fart erupted for 20 seconds.
"Oh a whoopie on a cushion trick. What a classic." You giggled.
"Names Sans, Sans the skeleton." "I'm Y/N." You said.
He guided you to his house. You had nowhere to stay. You met Sans brother.
"HELLO! IM THE GREAT PAPY-
He got cut off as Sans interrupted. "Shut up your voice is annoying. Your so worthless and obnoxious." He said as he went outside to grillbys.
Papyrus looked down on the ground. He felt like he was about to cry. "Don't cry Papyrus. He's no better." You said comforting papyrus.
'That was rude.' You thought.
Sans went home drunk. He kept shouting angry things to Papyrus.
"But Sans-
"SHUT UP YOU F**KING DISGUSTING MONSTER!" Sans shouted.
Papyrus frozed. You gaped. He just insulted his kind. He stormed into his room without a word and shut the door behind him.
"I will go talk to him pap." You said. "CAREFUL... HE NEVER OPENED UP TO ANYBODY BEFORE." Said Papyrus.
"I will try." You said determined. You walked upstairs and went into his room. He was asleep. You sighed.
Sans look cuddly. But you were like Papyrus. You see the good in everyone. Even when they do bad. You give them a chance.
You snuggled next to him. You noticed he was crying. You sighed. I guess he did care.
You snuggled into his jacket. You had a crush on him. But you never knew why. "I-I love you Sans." You said.
You felt teary when you see other people cry sometimes.
Sans suddenly wrapped his arms around you and gently placed his teeth into your head.
"Love you to Y/N." Said Sans. You both cuddled with each other.
(Might make a part two on this)