I love my girlfriend, but we're in a slump. When I go to her house to play, my younger sister Emi-chan adores me. At first I thought she was just spoiled, but... I never imagined she was a total slut! I was overwhelmed by her innocent temptations, as I hadn't had sex in a while. And Emi-chan is not only with me, but also with my mother's boyfriend... It's a huge violation of morals, but there's no turning back now! I'm going to cum inside this convenient slutty girl!