Maybe the driver could be a woman, who surprises the rich daughter by informing her that she was the previous lover of the man she is going out with and knows all about his fetishes
.
The driver obviously still has some feelings for this man and feels jilted by the younger woman in the back. She tells her that the only way to turn him on is to arrive at the door of his house desperate for the bathroom, and invites her to drink bottled water she has with her, but the driver also tells her that only she can do 'proper' desperation and as soon as the younger woman fails she will take him back.
The two women annoy each other so much that in the end they decide to battle it out for the mans' affection, and at the far end of the long track leading to the house (see where I am going with this?) they both sit in the car drinking as much water as they can in order to be able to put on the most intense display of pee-dancing at his front door, and finally make him decide who he wants.
When they are ready, they drive the short distance along the track and then get out the car and proceed to the front door, where their holding display begins. Unfortunately, despite their wonderful combined efforts there is no one home and they both end up flooding the porch by the front door. It is at this moment the man of their dreams arrives and is completely disgusted with the two wet and messy women standing by the door, as he seems to have a business client in the car with him.
Ooops.
(I have allowed my imagination to run riot a little here).