Scenario 1:you had hung out with sans for a while well you kinda had to make at least one friend beside flowey and sans' house was not too far away anyway,you came up to his house wondering if he could tell a few puns or something when you got there you found him laughing so hard while papyrus was trying to figure out that a phone couldn't hurt him.

Scenario 2:you were with toriel waking around snowdin you went into snowdin twin with her as she decided to let you go look on your own just to get you to know the place you talked to a few people everyone was talking about the two skeletons that had just moved in a little far in snowdin forest you wanted to go check it out so you started walking.

(Requested by Wolfkami_Arethos )