"Now we can continue the experiment in proper laboratory silence," Dr. Villiers said, his steely fingers tormenting her breasts again, while his relentless shaft drove in an out of her as relentlessly as a piston.
The pain became a nightmare of piercing, white-hot flame. Her breasts felt as though they were being torn from her chest, and she was sure her asshole would rupture at any moment. But strangely enough, her cunt was awash with the secretions of lust.
Villiers' breathing was harsher and choppier as he reamed deeper into her, his balls slapping against her buttocks as he finally sank the full length of his cock into her belly. Fresh jolts of pain traveled along her nervous system to her brain, making the previous agony seem like a mere itch.
Marcy was screeching and choking behind the soggy gag of her panties when Villiers stiffened, jerked back, and slammed in again. "Aaarrrrgh!" he grunted, and repeated his movements twice more before his cock quivered and shot its load of sperm splashing against her inner walls. His cream burned the raw tissue like scalding acid. But through the pain, and because of the pain, Marcy became aware that her cunt was contracting violently, producing an orgasm of shattering proportions.
"Ah-ha!" Dr. Villiers said triumphantly, and slammed into her more viciously than ever, sending such tides of excruciating pain crashing through her that consciousness faded in a haze of purple agony. She tumbled into welcome darkness, only faintly aware that he was saying, "Experiment completed successfully, but laboratory animal may have expired from the supreme pleasure engendered by it."