In the Drive-Thru the performing partner sits on the floor (leaning slightly back) and has their partner stand spread-legged over their face. The position is popular because the both the giver and receiver have a great deal of control; the giver is free to lick and suck at will, while the receiver can lower their bodies for more pressure, raise them for less pressure, or rock forward and backward to change the area of focus.
If the giver leans back against the edge of a couch or bed, they can also use their hands on the lower body area or reach up to the breast area.