The relationship then sort of dissolves into a series of, "Whose turn is it?" questions followed by, "I don't care; I'll get it this time," answers; or else the meal becomes a pretext for inviting the other person out, saying, "Let's go out to eat, since it's my turn anyway," when both parties know that it's not actually that person's turn.
Recognition of relationship, followed by understanding that the relationship is deep enough that it was already even before the other person asked the question. That's really what ghosti is to me.
Well, for future reference, it may work like the above, but ghosti doesn't work like this.