(Bill x reader) Unlikely lovers

This will be a story with bill x reader. You will be returning to Gravity falls with your family friends Mabel and dipper, you're birthday will be soon, you'll be turning 19, the twins recently turned 19 too. You were there during Weirdmageden so you know what happend. But someone you knew then is coming back to, how will every one react to your new feelings toward that someone. mostly how will Dipper react to it.