Rub at it's trouser snake

Reaching out while still prone on the cobblestone, Jessica's eyes locked onto the thing's writhing bulge. The Beast standing over her paused, uncertain in how to react, but not aggressing on her further. The bulge was thick under the cloth. Jessica was entranced by its size, the virility of its turgid nature, and a primal desire to elicit its essence into herself. She trailed her fingers, following its path as it wound within its confines. Above her the beast groaned hoarsely, yet encouragingly given the context.

Soon the path it took was further than her prone stance would allow, and Jessica got up onto her knees before it. Jessica took a moment to open up the front of her clothes, presenting her cleavage to the beast, which she spared a glance. Its face unreadable, save for its stare not meeting her eyes and the shifting of the bulge in the overalls. Jessica returned her hand to the now moving bulge. Finally finding the bell end, thicker than the rest, which had begun to dampen its confines. Abruptly the thing let out a grunt, and the whole length of the sinuous cock flexing and straining against it's confines, and with a pop, the overalls fell to cobblestone, revealing its muscular gray body, criss-crossed with scars and blotches. And more importantly to Jessica, its cock, long, thick, and prehensile. A wet substance lubricating its cockhead, and thick veins fed its muscular inflation.

The thing took more initiative, and made to grasp at Jessica's head. The action was without violence, but was still an act of control. Dimly Jessica realized too that the thing had its trousers around its ankles and would likely have trouble chasing her. Yet... she desired to drink from its tap, to indulge in her newfound hunger.