As Duncan howled, his face elongated into that of a wolf's muzzle and his ears became larger and more pointed. His hands became prehensile paws and his feet changed in size and shape, breaking out of his restricting shoes. A sharp pain flowed down his spine and he felt something growing in the back of his jeans. He slashed a hole with his claws and a tail poked out.
His shirt and jacket felt hot and tight, and he ripped them off to reveal his transformed body, bulkier and hairier. "NOOO!" he wailed "CHANGE ME BACK! I'LL MARRY YOU! I PROMISE!"
"It's too late for that." replied Esmarelda, tickling him under his chin. "You've had your chance. Now you'll be my pet. You're already halfway to becoming a wolf. Soon you'll lose the power of speech, and then you'll forget all about your human life."