"How many more, Barbara?" Brittany asks your wife, clinically.
"Still twelve more to go," Barbara replies. "You should focus the last dozen on his 'sit spot,' just above his thighs--make sure he doesn't sit very comfortably for the next week or so, Brittie!"
Brittany nods,. "Excellent suggestion," she agrees. Then to you she says cheerfully:
"Well, now it's time to finish your bare derriere off with the strap!"