The research theme of the fifth installment of SOD Lab is deep throat. A female employee who has never experienced deep throat is subjected to an extreme deep throat experiment using a mouth opener, fingers, a dildo, and a large penis. As the pain increases, the subject becomes more and more obscene, and overflows with a large amount of saliva and viscous vomit. A bridge is formed between the mouth and the penis with the deep throat love juice that cannot be cut even when separated.