One day, my parents decided to go on a trip for their wedding anniversary, leaving me alone at home with my sister. As someone who spends most of his time playing eroge (erotic games) on his smartphone, I couldn't help but fantasize about putting some of those sexual scenarios into practice with her. To my delight, she agreed to do whatever I asked after some persuasion due to her kind nature. Initially reluctant, she eventually began responding more enthusiastically...