Slave's dick is the property of the Mistress, so the slave is not allowed to masturbate or get an erection on his own. Mistress trains the slave so that he will not get an erection on his own. Mistress ties up the slave and seduces him by rubbing her boobs and pussy against his body while laughing. If the slave gives in to temptation and gets an erection, Mistress whips him as punishment, and his dick shrinks. Mistress rubs her ass against the slave's dick, which makes him get an erection and Mistress whips him. Slave tries to hold back from getting an erection, but he is no match for Mistress's handjob. Mistress teases and seduces the slave, and when he gets an erection, she whips him, teaching him that he should not get an erection on his own. Slave's erection, masturbation, and ejaculation all require Mistress' permission.