My younger sister has always been adorable, and lately she started working at a questionable men's esthetic salon. As her older brother, I can't help but worry if she's being taken advantage of by the customers. Still inexperienced, she gets seduced by a handsome client and ends up having sex with him. I become her practice partner for massage training, and she confides in me about her work. The situation grows increasingly intense, bringing me close to the edge every time. Constantly serving as her practice partner, I finally lose control and cross the line. I find myself falling deeper in love with my sister, who has grown more sensual through her work at the men's esthetic salon.