You were invited to a sleepover with the Sans Au, while you had already gotten everything ypu needed: like phone, Charger, headphones, ect ect.

You then got Teleported to the Mansion where the Sans AU's were.

Horror, Dust and Killer were just talking about something, While Dream, Ink and Blue were talking all together. And lastly Nightmare was read a book, while Error was just on some chair that was up in a corner in the room and it was made out of strings.