Roberto Malone, the unsuspecting son, is about to have his world turned upside down. His mother, a secret dominatrix, has invited a well-endowed stranger into their home. Roberto watches, a mix of horror and arousal, as his mother orders him to service the stranger's massive cock. Roberto hesitates, but the threat of exposure and his mother's firm hand on his shoulder compel him. He kneels, taking the stranger's cock into his mouth, his own cock twitching at the forbidden act.