Dipper and Mabel are both juniors at Gravity Falls high school. On the first day Dipper gets a new history teacher. This is BillDip.

This is my version of the guardian AU and it takes place after Weirdmaggedon. In my version Bill wasn't erased just his powers so he was just sent back to the dreamscape, at least till time baby gives him a choice. Yep that's all you need to know for now