Okay. That's weird, but... Imagine :

Bill×Ford mixed with Same Coin theory AU (aka, where Stan is Bill's reincarnation form).

Would it be incest between the Stan twins, considering Bill and Ford's relationship in past (future?)? Or, as Stan and Ford are platonic towards each other, it wouldn't matter what their relationship was in his life as Bill?

Or it's just me thinking too much about it...

It's a weird thought...