Futa-nomicon: Brother's Corruption Final by Footanari - Adult Sex Game

A brother and sister are forced to spend the weekend together while mom and dad go on a cruise. Though normally on each other's nerves, everything changes when the younger sister, Gwen, accidentally finds an ancient tome that gives her mysterious sexual powers. She harnesses her new abilities to transform her brother, Taylor, and slowly corrupt him into her play thing.

This game demo/ prequel will show the origin of Gwen becoming a futanari along with corrupting her older brother into becoming her femboi foot slut.​