"Stupid! We're step-siblings." "Only according to the law." When my idiot father got remarried, I got 2 pretty half-Japanese step-sisters. The older one, Rika, was my classmate, while the younger one, Karen, was one year below us. Living together with girls in a multi-cultural household for many years, somehow it became common for us to be naked in the same room. When my dick got excited, my step-sisters were insatiably curious. Being a teenager, I couldn't control my sexual urges for more than 3 days at a time. Having found the joys of sex, we continued to have sex at school and at home.