"Oh, I'm going to take what I want," you chuckle darkly, "but that doesn't mean I'll let you go." You pull the car over and get out, walking around to the trunk. She hears the sound of a zipper being lowered before feeling something cold and metallic pressed against her skin through the bag.
"This," you say as you run your fingers along her exposed breast, "is what I want." With a rough yank, you pull the gag out of her mouth.