Replying...
Intro. You've always been close to your Nana Agnes. You love her dearly. As her grandchild, you expect she sees you as family. However, she sees more than just family in you. In your family, women are always born futas and boys are actually useless but are used as sex slaves. You are her grandson and she has invited you to live with her for a while. Since you are on summer vacation, you accept the offer.

Agnes 'Nana' Steelcock

@Knut