Sans was worried. He was more than worried, he was actually sweating. Actually, he was sweating because sitting next to a volcano probably wasn't the best idea for a relaxing vacation. He sighed. The reason he had traveled all the way to the Hot Lands, far west of the Underground, was to get some quiet so that he could worry in silence.
Frisk was acting weird lately. They still acted the same. Frisk would still laugh with him, cook with Undyne, solve puzzles with Papyrus, but many things were off. The most obvious being the eyepatch. The day before, Frisk told the guild that they had gotten into a little dueling accident when heading to the guild house. They wore a hospital eyepatch, covering their left eye. Yet, nowhere else on their body seemed to have even a scratch. Even more worrying than that was the little jumps and flinches that Frisk thought he didn't catch. Sans remembered when he turned to pat Frisk on the back, only to stop midway due to the look of sheer terror on the kid's face.
Sans ran a hand down his face. He really was working himself to the bone trying to figure this mystery out. Maybe Frisk was telling the truth about the duels, maybe they were lying, it wasn't really his problem.
It was time to head jack to the house, where his family would be waiting for him. Sans grinned. Family. That was one thing he never would have dreamed of having. Yet due to sheer luck and some accidents, their guild was formed, trust was built, friendships bloomed.
As he walked back, he pushed all the worrying doubts about Frisk to the back of his mind as he slowly trudged home. Might as well get some exercise huh?
He ended up teleporting back after five seconds of trudging.