The woman rubs the side of her head where you slapped her and scowls. It's one of the few times you haven't seen her smile with eagerness and sadism. Her cruel gaze turns to you and she steps toward you, grabbing your hands in anger. "That's the last time you will use these to hurt me!" She touches your arms. "You like your lean arms? Watch them vanish!"
You lunge away from her, using all your muscles. Your body is so heavy you can hardly move it any more. As you do, your fingers feel soft and wrong. You cry out, but it comes as an alarmed pig grunt, as your fingers meld into a pig hoof, your hand into an elongated pig foot, and your arms plump out into fat, pink, pig legs. Involuntarily, you move from your sitting position and roll over. It seemed like the natural thing to do, but when you've done it, you realize you're on your knees and front hooves. Your teats nearly drag on the ground, and your head is troublingly close to the floor.
Your teats itch, and you reach to scratch it, except all you do is twitch one tubby pig leg. Your hands and arms are gone! You want to scream, but all you can do is squeal. You want to run, but all you can do is buck slightly and feel as your fat body wobbles.
"Look at it, you dunce!" the woman barks. "Look at me!"
Regretfully, you do so, and see her shaking her engorged butt. Its shape is so perfect. Your heart flutters, even after everything you've been through, at the thought of touching her enormous glutes. You grunt in sorrow. You have no dick, you have no hands, you are just a blob. You can feel your legs begin to change.
"Thank you," the woman says, admiring herself in the mirror. "The price you paid is a heavy one, but I will enjoy these curves and so will my future lovers. I have become more beautiful. You... well you are a pig. Now we all know what was hiding beneath that tenuous human aura."
You can feel your face distort, but you can't touch it, and you don't dare look in the mirror. As your transformation completes, you mourn silently, thick and low to the ground, and wonder what horrible future awaits you.