My father's second wife is a beautiful woman famous in town. Moreover, she has big breasts. My father, who is busy with work and cigarettes, doesn't have a bad relationship with Yumi-san... It's a waste to have such a beautiful woman nearby. I, who had long exceeded the limit of my patience, finally pushed Yumi-san down. Since then, it's been days of creampieing Yumi-san while waiting for my father to take a smoke break...