I love devices like this -- The homemade stocks keeps the feet positioned, while the handcuffs keep the slave from retracting her arms to permit escape.
The DFA's annual update of slave position training guidelines. It's recommended that you teach your slaves to assume all of these positions on command.
Real life kajira in the "nadu" kneeling position. it has a turian style slave collar locked on its neck and a "kef" brand on its left thigh. "kef" is the first letter in the gorean word "kajira" which means slavegirl.
"it was the position of the pleasure slave. i had taught her the position. it is one of the first things a good looking woman, fallen slave, is taught"