You didn’t do so well on your female anatomy test, she offers to give you a private lesson, but has no props so ends up showing you on her body, specifically the clit, the vagina and urethra, she decides it would be helpful if you saw her pee so you could really get an understanding of the vagina area. Then she asks if you would like to learn more, and mentions she sees your hard penis growing in your pants, and asks if you want to use your dick as a prop to use in my vagina. You of course say yes, and the lesson turns into a cum fest with invitations for more lessons in the future.