Kelly, her body glistening under the shower's pulsing spray, feels a primal urge to claim Mark. She slips on the harness, the silicone cock standing at attention. Mark, on all fours, presents his ass, ready and eager. Kelly teases him, running the head along his crack, making him squirm. She spits on him, rubbing it in, then pushes into his ass, feeling it stretch around her. Mark moans, his body tensing, then relaxing as Kelly starts to thrust, her hips moving in a rhythm as old as time. She fucks him hard, their bodies slapping together, the sound echoing in the tiled room. Mark's cock hangs heavy, untouched, as Kelly takes her pleasure, her breath coming in ragged gasps.