He should make them stand up, turn around, and put their hands behind their heads.  He should then open their jeans, pull them down, and pull down their panties.  After that, they should bend back over for another ten each.

Each one of these blue jean clad shapely bottoms should be spanked often enough that the seat of their blue jeans is well worn from the paddle.

This scene does get better. Their pants do come down and the spanking gets even better.