During her parents' two-day trip, the younger sister revealed her desires and was penetrated and ejaculated inside her. (Record of Rin Yumino's DASS-232)

My younger sister, Rinmeng, and I have always had a physical relationship. To avoid crossing the line, I went to university far away. One day when I returned home, my sister tempted me to have sex, and in a moment of irrationality, I thrust my penis into her vagina...