there's a girl i'm interested in. that girl is super cute, tsundere, and carelessly shows me panty shots and breast flashes [rina-chan]. but there's only one problem... that is, rina-chan is my friend's younger sister. at first i was hesitant because of my friend, but i can't stand it anymore. inviting [rina-chan], who carelessly comes to me and acts spoiled, into a physical relationship!? i'm not satisfied with just having sex while avoiding my friend's eyes, and i even do this and that in front of my sleeping friend...
