In 'Master's Lesson', a lucky sub is initiated into the sacred art of ass and cock worship. 'Culo' and 'mamada' are the orders of the day as the student, under the watchful eye of their master, explores the depths of anal appreciation. With reverent hands and a hungry tongue, they trace the master's ass and cock, learning the true meaning of submission and service, all under the expert guidance of Mangeog.