A sissy's transformation begins with a prostate massage session on InstitutionX's fuck-machine. Naked and vulnerable, the trainee is positioned over the mechanical cock, his asshole gaping with anticipation. The machine's pistoning action starts slow, but soon it's a relentless pounding, the sissy's cries of pleasure echoing in the sterile room. The dominatrix watches, her own arousal evident, as the sissy's prostate is milked repeatedly. The fuck-machine's unyielding rhythm drives the sissy closer to the edge, his body a canvas of red welts from the impact play. As the final waves of orgasm ripple through him, the sissy collapses, sated and transformed, onto the cold, cum-stained floor.