The anonymous voyager, clad in black, is led by the hand through the labyrinthine metro system, the only sounds their footsteps and the distant rumble of trains. The air grows colder, heavier, as they venture deeper. The guide stops, turning to face the explorer. A gloved hand reaches out, pulling the voyager close, the other hand tracing a path down to the zipper. Clothes are pushed aside, revealing a smooth, quivering ass. The guide's fingers, slick with lube, tease the tight hole, stretching it, preparing it. The voyager gasps as a thick, hard cock replaces the fingers, pushing inside, claiming the untouched territory with slow, steady thrusts.