Tomorrow my girlfriend is going on a business trip so tonight I'm going to her house to spend the night. Her younger sister Tsukasa Aoi is at home, a very hot girl. The next morning my girlfriend left early, I woke up later and hurried back home. But when I got to the door, Tsukasa Aoi called me, she had just finished bathing and was only wearing a towel. What does Aoi mean, I'm going to fuck her.