The demon king and the guardian (up for adoption)

What if dipper was one of the guardians of the weirdness barrier and killing him destroyed the barrier and Bill found out about it but was in love with him? Would he kill Dipper and take over the world? Would he stay in gravity falls and rule there with his queen by his side? Would he find a way to rule the world with his queen or would he not rule the world to keep his love safe? Read to find out