How odd he tasted! Slowly she worked her way around to the other side. It was sticky there, and the taste was different. She thought he must have overflowed a little, in anticipation of her mouthing. How strange to taste a man's semen – his seed. It was the substance intended for a woman's womb, not her mouth. Marcy hesitated, thinking she should stop this unnatural act.
But Dr. Villiers had other ideas. Impatient with her tentative approach, he grabbed her by the hair and jammed the eight or nine inches of hard cock into her mouth as far as it would go.
"Never begin an experiment you don't intend to finish," he told her, rolling them both over so he was on top and could pound the heavy cock in and out between her lips.
Marcy tried to protest, but her tongue was slammed back against her tonsils and she couldn't make a sound. It was either suck or strangle. In desperation, she pursed her lips around the intruding member and started sucking. Almost at once, she was overwhelmed by the feel and taste of the prick in her mouth.
She worked her tongue free and began running it in circles around and around the awesome lance, while her lips sucked deeply. Time drifted by in a vague, shadowy way. Marcy breathed occasionally, and was vaguely aware that the pulsing of her cunt lips was alternating with her sucking mouth. There was a sweet-salt taste on her tongue, and she was acutely conscious of the feel of the shaft pulling almost free of her suctioning mouth. Then it would ram back in with such brutal force that it threatened to jar her teeth loose. But even that was part of the pleasure, of the joy she had never known before – the novel thrill of being used as a mere receptacle for hard cock.