A mother masturbates in secret in the bathroom. One day, she witnesses her son masturbating on the sofa. Her body heats up after seeing a brave cock other than her husband's for the first time in a long time, and she can't suppress her throbbing desire. She rushes into the bathroom and masturbates intensely, climaxing over and over again. The son is suspicious of his mother, who has been taking a long time to come out of the bathroom, so he questions her. She says, "From now on, you don't have to do it alone, I'll help you..." and drags him into a forbidden world...