When a slave can do something no others can, he finds his vocation. In the gentle hands of Mistress Roberta this slave finally found his vocation: his ass can now swallow artificial cocks of impressive sizes and shapes and the training goes on. His ass is eager to be penetrated and Mistress Roberta slowly lubricates and prepares him for the task ahead. With his ass in the air he is the willing subject of his Mistress's curiosity and his own desire. His ass elasticity will be stretched to the limits and he will beg for a moment of relaxation.