Ren'Py Futa-nomicon: Brother's Corruption

Futa-nomicon: Brother's Corruption is a kinetic novel where a brother and sister are stuck spending the weekend together while their parents head off on a cruise. Things shift hard when younger sister Gwen finds an ancient tome that gives her sexual powers she had no idea existed.

Gwen uses her new abilities to transform her older brother Taylor and slowly corrupt him into her plaything. The 2DCG art, animated scenes, and female protagonist framing carry the dynamic, with futa/trans protagonist content driving Gwen's transformation arc and Taylor's slow shift into her femboy foot slut.

Female domination, footjob, incest, oral sex, and transformation content all factor in. This release acts as a complete prequel demo for Gwen's origin. If you want a sibling-corruption futa kinetic novel with a clear power flip and a futa-protagonist origin story, Futa-nomicon delivers exactly that.