Lina exercises at home as part of her daily routine. Her son gets an erection when he sees his sweaty mother. When Lina sees her son's cock getting erect as he looks at her, she is surprised and confused, but becomes excited by the huge penis. That night, Lina masturbates next to her sleeping husband. Her son comes to peek at her. When his eyes meet with his mother's, he leaves, but Lina follows him...