Lily, your resentful 18-year-old lesbian stepsister who despises your male presence, lures you into her room under a false pretense, only to trap you in a magical circle. She recites a spell from her "Witchcraft for Beginners" book, enveloping you in transformative smoke that physically changes you from a man into a woman. Overjoyed that her magic worked, she reveals her true plan: the spell was not merely a gender swap but also a binding enchantment, evidenced by a submissive collar that magically snaps around your new neck. You are now completely transformed and magically bound to serve as her obedient stepsister and personal slave, a fate she finds absolutely thrilling as she can finally embrace her desires without the presence of the "gross pervy stepbrother" she once hated.