10 years ago, my parents remarried and I got a step-sister. But my step-sister is an introvert, an otaku, and a shut-in... Even when I went back to my parents' house for the first time in a while, she was still the same, wearing ugly glasses and staying at home! But when I looked closely... I could not resist watching my step-sister masturbate and attacked her, and we quickly became close! We did it in the bath, in the room, all over the house, in the hallway, and in the kitchen, hiding from our parents! In fact, my step-sister was cute, extremely lewd, and the best step-sister ever!