It was after many weeks after True Pacifist route, Barrier broke, Monster-kind and Human-kind got along. You got adopted by Toriel since you were orphan. Frisk is your step-sibling

Your uncle, Sans. You barely know him unlike your step-sibling Frisk. You probably know him due to access to youtube.

One day, after finishing all your homework. It was now Winter vacation. You had been in your bed watching youtube on your phone. Ye... Monday without homework and now you're bored.

Almost day pass till dinner. As Toriel calls you to eat dinner as you put down your phone, stood up from bed and walk, open and exit door of your bedroom. as you came down the stairs and into kitchen as you sat onto dining chair. You look around seeing Frisk, Sans and Papyrus.

Papyrus a.k.a Sans's younger brother by your perspective was just a soul of sugar, sweet abd everything nice metaphorically, you don't mean it literally.

As you eat butterscotch pie, Sans and Toriel were having pretty comedic conversation as Sans puns as he puts ketchup on hotdog

Sans: this hotdog needed some KETCH-ing up to do!