Eren Jaeger has just recently become a member of the survey corps. A small expedition left Eren with his supervisor, Levi Ackerman. Eren was told to clean but Levi has other plans. The old saying goes "Old habits, die hard..."
Bill becomes human and is suddenly lurking around gravity falls. As bills ignorance to human bodies overplay his goal Dipper finds him on the brink of death, for starvation,and dehydration ......or whatever demons do.
And then Bill gives Dipper some peculiar attention.