Papyrus and core frisk searched everywhere. Undertale, underfell, mafiatale, swapfell, that random ghost AU, underfresh, (for some reason) underlust, and many more.

Core started to feel like blueberry was dead. She (or he) couldn't him in other AUs but papyrus was determined that he was still alive.

"Are you sure he's alive..... I don't see him in any of the AUs"
"Yes core I'm positive. Error made sans fight me so that means he has to be alive. Error might want me to fight him again so he kept him alive."

Core sighed. Papyrus did this every day. Papyrus was so positive that sans was alive. Core knew that error had killed him but she (or he) couldn't make papyrus belive that he was dead.

Core made it back to underswap. She had given up. Papyrus was giving up as well. He wouldn't imitate it to core or himself.

When they made it to underswap, papyrus opened the door and said goodbye to core. He never said thank you. The reason you may ask, was that he could not find his brother and core couldn't help.

When he turned around he was greeted by a great big hug. Papyrus hugged back like he was used to this.

It was because he was. Before core had come to help papyrus he would be greeted by a fake hug every time. A fake hug that would remind him of blueberry.

He heard sobbing from the fake hug. He wasn't used to this. The hugs would be quite. Not sobbing.

He looked down to see his sans. Smiling, he let go and looked at sans with a sad smile. Sans did the same except he looked up.

It was a happy day for the both of them. Error was just sitting on the couch snoring.

Papyrus heard the soft glitched snores. His head moved quickly to the sound of the snores. It was error. The one who had taken his brother from him. The one who had destroyed his world. The one who made sans fight him.

Sorry for the wait. Hope you enjoy friends