What we do for Precipice (which I dare say is more advanced than most advanced here, albeit we're using an archaic scale from the previous forum we were at) for interaction on a small scale (i.e., characters) is to simply have all that discussion in one post. We go into Steam or Skype or something and we basically write the dialogue for our respective characters that go into the post. So therefore we have one post really written by two people with the dialogue and interaction going on within it, so we can have smallscale relations without doing one-liners.

Larsgescale interaction, of course, is just the post after where your guy reads the newspaper and casually remarks how Prussia invaded Poland (again.)