In the closed room of a special magic mirror studio, a friendly family on the street challenges a mother-daughter oyakodon threesome! If you can make a virgin son ejaculate continuously, you'll get 1 million yen! Even though he knows it's taboo, the virgin's penis is on the verge of exploding with a full erection when he sees his mother's big breasts and his sister's high school pussy for the first time in a while! Will the three of them, whose sexual desires are stimulated in front of their father, end up engaging in the super forbidden double creampie incest!?