Sans was exploring AU's, meeting other Sanses he decided to explore Underfell and appeared in front of Red's post. Sans eventually found Red hiding under his post, looking scared of something or someone. He sat down next to Red and tried to talk to him. "Uh, Red what are doing?" Red just replied with, "from boss." Sans could tell he didn't want to talk about it and just sat next to him in silence.
After a few minutes, however, he could hear someone walking towards them. Red started to hug his legs closer to him as Edge (fell papyrus) started to yell. Sans noticed this and started trying to calm Red down. This didn't do anything and Red started to cry. Sans then sighed, realizing that this wasn't the best place for Red at the moment, and teleported both Red and himself back to his house.
After a few minutes, Red seemed to calm down and fell asleep on the couch. Although Red seemed fine, Sans stayed awake making sure he was alright.
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"Don't kill and Don't be Killed." (Kustard)
FanfictionClassic is exploring the different Aus when he travels to Underfell. After seeing how scared Red is he takes him back to Undertale. Classic Sans and Papyrus show Red kindness which makes Red realize that you don't have to kill to not be killed.