Yes, I find it exceedingly likely that a faculty member in a relationship with a student with end up favoring them, in some manner, in class and with grades. It

Yes, I find it exceedingly likely that a faculty member in a relationship with a student with end up favoring them, in some manner, in class and with grades. It doesn't have to be conscious, we know people suffer many cognitive biases. The professional thing to do is to avoid being in such a situation that the cognitive biases can come into play.