While Frisk's uncle was waiting on their visit, Sans was being moved to his cell. As both cellmates died and guards didn't like there only being one person to a cell.
Sans gathered his very limited possessions. At least, due to protection he could keep his soap and sleep now. Apparently, Dillard was a very well known and respected prisoner. He wondered if that had something to do with the way he fights.
Eerily, it was similar to Sans, in that he waited to be attacked first (or in Sans case, for him to be attacked), then a warning, a lot of the times he would just dodge until his attacker got tired (or in Sans case, move him out of the way), then fight.
Not that he didn't start fights, Sans witnessed that first hand when his old cellmate screamed at him, "You woke me up with your screaming last night, skeleton!" "Sorry." Sans muttered, "You're a piece of shit. And sleeping when you don't deserve it!" Shower time came before the cellmate could do anything, but Sans got that you will be dealt with look.
When dinner came around, Dillard snuck some magic in the man's drink. Sans suspected this man's death was no accident.
Not that Sans wasn't paying the price now. "I want a doggy today." Dillard's voice got deeper, "One as good as you expected my nibbling to be." Sans got on his hands and knees, "Roof roof." He was scratched on the skull, "Good boy." The man grabbed a stick off the ground and Sans saw where that was going.
The man threw the stick across the fenced yard. (Sans knows exactly how those electric gates react if a prisoner touches it, by forced experience. Intent or not, electric shocks still hurt.) Sans knew he was expected to get it, so he ran on his hands and knees, ignoring the laughter of the other inmates. He placed the stick in his mouth and dropped it in front of Dillard.
"You want to play some more, don't you, puppy?" Sans barked an excited bark, looking at the stick, striking his hands forward. And he ended up playing fetch for yard time.
Back into their cell, they both went. Sans was tired and sweaty. "So, Sans. Frisk is visiting." "I'm glad you get to see the kiddo." "Yep. Now what are you not doing?" "I am not letting Frisk know I am here." "Why is that?" "I am a manipulative coward who expected them to solve things peacefully, knowing they were in danger." "Glad you understand."
Dillard laughed, "I think we need to add a rule for today." Sans nodded. "Today, you don't exist. No noise, no sound." Dillard looked at the top bunk. "Sit on my bed." Sans did as commanded and sat on the top bunk. He felt weird being on his tormentor's bed. Not that he was complaining, he was comfy for once, and one tormentor is better than many tormentors. "You are not to move from there until I come back from visitation." Sans nodded. Well, it isn't the worst rule in the world.