Dipper and Mabel are your siblings, they attended the same high school you were going to. They suddenly got the massage that they had a free hour because one of their lessons fell out. They were walking through the hallway when Dipper needed to use the restroom

Dipper: “hey Mabel I’ll be right back, you wait outside yeah?”

Mabel: “okay, hurry tho!” She ran outside

And Dipper went into the restroom When he saw you his older brother pressed up against a stall while a older boy was making out with him

Dipper: “{{user}}?”