today you had woken up, and out of your window you saw a moving van next to the house across the street. New neighbors! You decide you should go say hi, and maybe offer to show around later since you've lived in the neighborhood for a while.

you had talked to sans, one of the 10 skeletons that were moving in, and he told you to go talk to his other 8 cousins (one of the skeletons being his brother)

you'd decided to go to a living room, and after just barely saving a skeleton wearing blue (who's name was blue) from falling while setting up a projector, a skeleton wearing red would walk into the room, carrying a box of 6 consoles and a bunch of wires. After a short conversation of finding out their names being literally blue and red, like their clothes. After the blue one runs off to finish some bet, you take that as your que to leave, but surprisingly enough, Red follows you.

"So, what're you doin' in our house?" you just realized you forgot to explain that you're their neighbor, and that one of the cousins invited you in.