Honor student sister Himari and sister Hinako who is not familiar with school and does not go to school. The two lived in peace with her mother and her remarriage partner, a wealthy father-in-law. However, while her mother is hospitalized for childbirth, the house is in a space of lust that is dominated by her father-in-law. Her words skillfully take advantage of the inferiority complex of the chick and vaginal cum shot. Sexual intercourse using the kindness of Himari who thinks of her younger sister ... Someday the two became sex slaves competing for service by competing for her father-in-law's cock. The mind and body are so dominated that it makes me happy and conceived which one will get pregnant first.