Rino is married to Shuji, who has excellent physical compatibility. Her husband had a child, Koji, but he had a sweet sex life without care. One day, Rino, who was told that her husband was subject to restructuring, entrusted her body to her boss Sada for her husband's sake. However, due to a job issue, she became sexless with her husband, and Rino's crotch just ached. At that time, Rino finds the underwear she should have thrown away in Koji's room... Rino who thinks of her son who imagines her own body and is lustful. Finally seduced my son with a glossy appearance ….