【Female-targeted anal play work】The lovestruck couple, Kazuka and Riku. One day, hearing from a friend that 'men who feel pleasure through the anus are cute,' Kazuka becomes interested in men's anuses. Since she has no interest in other men, she asks Riku to develop his anus... Although Riku was originally normal and didn't think about anal at all, he gradually gets developed successfully, ultimately resulting in a custom asshole for Kazuka that can only climax through the butt!
