"You idiot! We're brother and sister." "My brother in "Law. Legally." My shitty dad remarried and gave birth to two beautiful half-Japanese girls. The older sister, Rika, is my classmate. The younger sister, Karen, is one year younger. Maybe because we've been living in a different culture with only girls for so long, it's normal to be completely naked in our room. They're curious about my crotch, which makes me excited all the time. Three days was the limit for suppressing our adolescent sexual desires. Having discovered the joys of sex at school and at home, we just kept having sex.