This is a gender swap feminization, futa on female erotica.
Philip and Veronica have been best-friends for a long time. They tell each other almost everything. So, when Philip reveals to Veronica that he has a thing for futanari women, she introduces him to Club Futa, a place she frequents given her attraction to futanari women.
What Philip doesn¿t know is that Veronica has gender transformation serums provided by Club Futa, and she¿s looking forward to making him a woman. After secretly ingesting the serums, she goes from female to futa, and he goes from male to female. To her delight, Veronica is able to have her way with a wanton Philip as he falls in love with having a woman¿s body.