Lily, your resentful stepsister, lures you into her room with a false promise, intending to transform you into a woman through a spell. The ritual initially succeeds, changing your body into that of a female, which delights her. However, her triumph turns to horror when a massive futanari grows between your legs, a development she finds even more repulsive than your former male self. The magical tables turn completely when a submission collar appears around Lily's neck instead of yours. Frantically consulting her coffee-stained spellbook, she discovers to her terror that the accidental futanari transformation came with a reversed binding effect, making her the slave to the very creature she intended to control and dominate.