"You poor thing" Mary addressed Cat "Everybody sees the big, tough thief girl in black leather, and thinks you're a dom. But in your heart you really long to submit, don't you, my pet?"
Cat began to answer, but Mary put her finger to her lips. "Silence, pet. Now take off your clothes, and go to the kitchen. In the top drawer there's a leather collar and a leash. Put it on and come back."
While Cat was busy in the kitchen, Mary picked a vial from the box. She held it in a way to conceal the label.
Mary could barely restrain herself at the sight of the beautiful, naked thief wearing nothing but a leather collar and a leash. Cat remained silent, but Mary could see the little shivers running over her body in the ecstasy of anticipation.
Mary held out the vial. "Now, I can show you what the vial is for, and you can decide whether or not you want to be changed. But if you're really my pet, thief-girl, you'll drink it without knowing what it is, just because I want you to."
Cat knelt before her, and opened her mouth. Mary brought the vial to Cat's lips. "All of it?" Mary whispered. Cat nodded. "Good girl." said Mary with a tone of approval that sent another shiver through the kneeling Cat. "Don't gulp" she told her pet as she began to pour the liquid into Cat's open mouth. "We're going to enjoy every moment."