Sensory Overload

Stan throws a party at the Mystery Shack, and everyone at school is invited. Problem is, a certain one of his friends can't stand loud crowds.

Relativity Falls AU, but not canon. They're 17 in this fic, and Fidds is 18.
Stan doesn't know about Bella's SPD. So he's not being a jerk, he's just a bit clueless.
I actually do have SPD, so this is an actual recount of how audible sensory overload feels to me.