My father remarried, and I got a new step-sister who is the same age as me. What’s more, my step-sister is the masturbation pet of the boys in my class - the smallest classmate in school, with the biggest breasts!

After a series of twists and turns, Io finds herself having an affair with a promising subordinate. While at work, she maintains a professional demeanor, but once work is over, she gives in to his advances and opens her legs to him.