My friend's wife is a lewd private tutor

Unable to bear the son who keeps failing his university entrance exams, his father asks Kasumi, a friend's wife and excellent grades, to become a private tutor. Kasumi, who happily accepts the lesson, enthusiastically teaches her studies, but the excitement of Kasumi's chest, which gets her passionate about her, and the stimulation of the cleavage that peers through her shirt, was too strong for the boy. A boy who can no longer bears the unconscious repeated lewd temptations...