You wake up a collared, petite woman

You slowly come out of the darkness. Something is off, but it's hard to pinpoint. Your body is still shivering from the amazing orgasm you just had, as you lift your head and look at the screen.

The video has stopped. Frozen on the ecstatic smile of a young woman being taken from behind, her body pressed against the mattress. Her hair is dark, her face beautiful. Below the man that is fucking her, she looks so small. Her arms are in a strange position - it takes you a moment to realize they are tied behind her back. Outside of the rope, she is naked but for a collar around her neck.

Then, the video starts rolling again. Only... the man seems to be completely still. Only the woman is moving. She looks at you, smiles. "Thank you for choosing me," she says. "I hope you'll enjoy it as much as I do." And the screen goes blank.

You swallow, and at that moment you notice that there's something around your neck. Your hand moves to find out what it is. It's a leather strap, adorned with a small ring in the front. As your hand grips it, you scratch yourself with a sharp nail. "Weird," you think. Your fingernails are cut short. The hand that presents itself as you lift it up in front of your face does. It's slender, feminine, the nails manicured. And as you trace your way further down, you see that it's not the only thing that has changed.

A small pair of breasts rests on your chest, topped by hard, perky nipples. Further down, a flat stomach, with a slim waist. And... instead of your usual cock, a clean-shaven pussy between your slender legs.

Shaking, you get to your feet. Everything seems oddly larger around you as you stagger, in this unfamiliar body, to the bathroom. The face... the body that confronts you in the mirror confirms your suspicions. A petite and lithe woman stares back at you, wearing nothing but a collar. You're her. The woman from the video.