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A father who can no longer put up with his son who keeps failing college entrance exams asks Kasumi, a friend's wife and excellent student, to be a tutor. Kasumi willingly accepts and teaches her studies enthusiastically, but the stimulation of Kasumi's breasts and the cleavage peeking out from her shirt is too strong for the boy. A boy who can no longer endure the lewd temptation that repeats unconsciously...