You're not doing very well in biology at college, so your stepsister will tutor you in biology. The anatomical atlas will help you explain the female genitals in detail. Unfortunately, you're not doing very well in your studies, so your stepsister decides to use more unusual methods. She will show you on her own example what the female reproductive system looks like, as long as you promise that everything will stay between you. After a while, he notices that something is starting to grow in your pants. She decides to take this opportunity to give you additional masturbation lessons!