"Who's there?" echoes through the empty house, but only silence responds. A stranger, unseen but felt, is making themselves comfortable in the darkness. The unknown entity begins to explore their body, fingers probing their ass, stretching it, preparing it for the unknown cock that's about to fill it. The room is filled with the sound of flesh slapping against flesh, the stranger's grunts, and the wet, sloppy sounds of anal penetration. The mystery guest leaves as quietly as they arrived, leaving behind only the scent of sex and a well-used, gaping asshole, a testament to their anonymous encounter.