Shota is playing ninja in the park. He meets Aika, a runaway gal, and takes her to his house, but what a surprise! His sister and Shota's father were once a student and teacher, and their relationship was even more perverted than that. Shota witnesses his father caressing Aika's butt, excited to see a gal's ass for the first time in a long time. "I want to learn some naughty ninja techniques too!" he says, staring and touching his sister's plump gal hips! He gets so excited that his dick gets hard, and he gets pleasure from his sister's new ninja technique!