Caged and bare, InstitutionX's eager submissive presents his ass to the unblinking, mechanical fuck-machine, its relentless, throbbing probe poised at his quivering pucker. As the machine's unyielding rhythm begins, he gasps, gripping the restraints, his prostate milked mercilessly. The room echoes with the wet, slapping sounds of machine-fucking, his moans growing louder, more desperate, as the intense, bordering-on-painful pleasure threatens to overwhelm him.