The restraining device is apparently called a ‘scavenger’s daughter’ and was invented in the court of King Henry VIII. Rarely used historically, there is one genuine one known to exist that is still in the Tower of London. (xpost from /r/Bondage)
New from the Rube Goldberg Division of Predicament Bondage Devices for 2018 -- the Sluterizer Blowjob Trainer! Now with confetti popper that goes off when the slut orgasms!