The fifth installment of SOD Lab's research theme is fellatio. Using a mouth opener, fingers, dildos, and a huge cock to perform extreme fellatio experiments on female employees who have never experienced deepthroating. As the pain increases, lewd feelings intensify, causing the subject to drool excessively and secrete high-viscosity love juices. Even when separated, the deepthroat love juices create a bridge between the mouth and the cock.
