At home, Rina exercises daily, her body drenched in sweat. Watching her exposed, soaked form, her son naturally becomes aroused, unable to suppress his growing cock. Seeing her son's reaction, Rina can't hide her shock and confusion, her eyes drawn to his massive erection. That night, while her husband sleeps, Rina quietly enjoys masturbating. Intrigued by the scene, her son sneaks into the room, but when their eyes meet, he panics and quickly flees. Yet Rina finds herself drawn to him, chasing after her son.