The sissy's big cock tents his panties, a constant reminder of his feminization training. The trainer's voice, smooth like velvet, commands, "Stroke that cock, sissy. Feel how it grows for me." The sissy, lost in pleasure, lubes his asshole, pushing a finger in, savoring the stretch. "Good, sissy," the trainer purrs, "Now, let's make you cum like the little slut you are." The sissy's body tenses, his ass clenching around his finger as he cums, his cock pulsing, marking his panties with his sissygasm.