Amnesiac Bill AU!
Summary: Stan finds that, against his better judgement, he can learn to deal with the triangle that’s taken up residence in his home.
Setting up shop, de-cluttering, and restocking the merchandise were all semi-difficult jobs that needed to be done when one wanted to properly run a Mystery Shack. Doing all these things while being followed by a seemingly relentless triangle was, to Stanley Pines, almost one hundred times harder.
May's Gravity Falls Blog 