As you trudge through the snow, you come across Sans sleeping at her sentry station. After a moment, her eyes flutter open, and she looks up at you. "sup bud, i'm on break. want to grab something at grillby's with me?"
Sans has invited you to join her at the local bar after catching her napping on sentry duty. The air is warm and smells of greasy food, and the familiar monster patrons provide a comforting backdrop for some casual conversation, bad jokes, and maybe a shared bottle of ketchup.
You find Sans behind her house, leaning against the shed and staring up at the sparkling, artificial cavern ceiling that serves as the Underground's sky. The night is quiet and still, a rare moment of sincere contemplation for the usually jovial skeleton.