Submission Collar: The Futanari Stepsister’s Transformation

You're in your room, indulging in your usual pastime of admiring curvy women online, when Lily's voice cuts through your concentration. "Hey stepbro, I found some of those magazines you like under my bed and I can't reach them. Want to come help me get them out?" Despite your better judgment, the suggestive tone in her voice sends a jolt of excitement through you, and you practically leap from your bed, hurrying down the hall to her room.

When you push open the door, you're momentarily confused by the scene before you. Lily's room is adorned with feminist posters and books, with a rainbow pride flag hanging prominently on her wall. There are no magazines in sight, just Lily standing in the center of the room, holding a book titled "Witchcraft for Beginners." She smirks at your bewildered expression, her brown eyes glinting with mischief as she flips through the pages.

"I knew you couldn't resist," she says with a contemptuous laugh. "Men are so predictable." Before you can react or retreat, she begins reading from the book, her voice rising and falling in an ancient rhythm. "Flesh of man, no longer be, transform and shape to match my decree. From his form to hers I now decree, as I will, so mote it be!"

Purple smoke billows from nowhere, wrapping around your body like a cocoon. It smells of lavender and something metallic, something ancient. You try to move, to run, but your limbs won't obey your commands. The smoke tightens around you, tingling and warm, and you feel a strange pulling sensation throughout your entire body, as if every cell is being rearranged.

When the smoke finally clears, you feel different. Lighter. Your clothes hang oddly on your frame, and when you look down, you see breasts swelling against your t-shirt. Your hips feel wider, your waist narrower. You reach up to touch your face and your hands feel smaller, more delicate. Your reflection in Lily's mirror shows a stranger—a woman with your eyes but softer features, longer hair, and unmistakably female curves.

"It worked!" Lily squeals with delight, clapping her hands together. "You're actually a woman! Oh, this is better than I ever imagined. I finally have the stepsister I've always wanted instead of that gross pervy stepbrother." She approaches you with a predatory smile, circling you like a shark. "And now I can embrace all my desires with you. No more pretending, no more hiding who I am."

As she speaks, you feel a strange sensation between your legs. A tingling warmth that quickly intensifies into pressure. You look down just in time to see something pushing against the fabric of your pants, growing rapidly. Within seconds, a massive bulge forms, and as your pants strain against it, a thick, fat girlcock springs free, standing proudly between your legs. It dwarfs your old dick by comparison, thick and veiny with a prominent head, despite the pussy you can feel beneath it.

Lily's triumphant expression shatters into disbelief. "No... no! That's not right!" she shrieks, her voice cracking with panic. "You were supposed to be all woman! I saw... I saw the pussy! What is that disgusting thing doing there?" She takes a step back, her face contorted with a mixture of horror and confusion. "You're a... a futanari? That's even worse than a man!"

Before she can say more, a leather collar materializes out of thin air, snapping around her neck instead of yours. Her eyes widen in terror as she instinctively reaches for it, her fingers trembling as they touch the leather binding her. The spellbook falls from her grasp, clattering to the floor.

"No, no, no!" she cries out, scrambling to pick up the book. "This can't be happening!" She frantically flips through the pages, her hands shaking so badly she can barely turn them. "Where is it? Where's the reversal spell?" Her eyes scan the pages desperately until they land on a section about transforming men into futanari women. There's a coffee stain obscuring part of the text, but she can make out enough to read the warning at the bottom: "Warning: The caster will become the slave to the futanari."

Lily's face goes pale as she reads the words, her eyes darting between the book and the collar around her neck. "I... I had that part covered before," she stammers, her voice barely a whisper. "The slave spell was supposed to bind you to me, not..." Her words trail off as realization dawns on her face, her expression shifting from panic to utter despair as she understands the magnitude of her mistake.