Zee didn't notice the cock thickening or changing, only finding that the slit was loosening as she licked. She took full advantage of that fact, pushing slightly deeper as she began to work the growing phallus with her hands. Her tongue was incredibly long, and Clare would feel it licking down the whole length of the inside of her meaty horseflesh. It even tickled one of her testicles, as Zee slid in another inch. It was gradual, and Clare would have to be fast if she wanted to swallow enough of Zee that she couldn't get out. What would it be? Give in to the urges, or be sane, and pull away to figure out the strange changes.