If he is an MEI and you are flying you can log it as PIC dual recieved. If he is not an MEI you would have to be sole manipulator of the controls since the airplane does not require 2 pilots and then you would be logging PIC and he would be logging nothing just merely acting as the PIC of the aircraft.

If he is being paid though to fly passengers I am not sure they would want someone else flying the plane from the right seat especially if something went wrong it would be an insurance nightmare. Bad juju

It can be done though