Walking in the Forest

Dipper loves the forest, He goes there every morning for walks and inspiration or even just from stress. One day, however, when he goes deep into the forest to the tree house he built, a certain demon shows up, Bill Cipher, but he has changed, He is in a human form and doesn't seem to only want to unleash powerful evil! What will happen when these two hang out more and more everyday?

Dipper- 17
Bill- 18

Town if Gravity Falls, Oregon.