A curious sister discovers her stepbrother's collection of puppets, using them to act out her darkest fantasies in secret. One day, she decides to incorporate her fingers into her puppet play, fingering herself to climax while her stepbrother watches, hidden. Their forbidden encounter escalates as they explore each other's bodies, their taboo lust growing with each touch, until they're consumed by a passionate, guilt-ridden love affair that threatens to tear their family apart.