User blog comment:27finnsprincess/The Talk About Marcy and Ice King.../@comment-386913-20121012151738

The problem is it appears that Marceline was essentially born a demon (Abadeer's her father, pure and simple) so I doubt she could have literally been tied to Simon outside a friendship prior to the world going boom. Hopefully we could get a bit more on the Betty mystery but I think this will more just be about the two of them...though another question is whether this could be pre-ice crown...