“Nothing wrong with that,” she said. “Now let’s try. But let’s not be extravagant. No grand finale. If all’s well, we’ll save that for later.”

Before I had chance to decide exactly what was required, Casey had risen and stepped elegantly out of her knickers, placing them on the chair beside her previously discarded skirt. She moved to the desk and bent over it from the waist, face down. Her weight was on her forearms, her feet were straddled. The invitation could not have been more blatant. I allowed myself the luxury of standing behind her to admire the toned muscles of her buttocks, the pink sphincter, the white thighs contrasted with black stockings. A brief investigation with my fingers confirmed that she was eminently capable of accepting me. I steadied myself with one hand on her hip and with the other guided my cock into her cunt. Uncertain of what she meant by ‘nothing extravagant,’ I held myself in place and waited.

Without looking back, she said, “That’s good. Now move. But remember - be careful.”

It wasn’t easy. The generous lubrication from her arousal was countered by her natural tightness. As I began to feed her a steadily rhythmic penetration, I found it necessary to concentrate on the clock on the wall facing us, watching the second hand slowly circle the dial, trying to extract from memory the appointments in the next day’s diary. Anything to take my mind away from the delicious sensation building below. I now understood what she meant by the forbidden ‘grand finale.’ I had to do everything in my power to stop it happening.

Just in time, Casey said, “Enough. Let’s not get carried away. Either of us.” In one supple movement, she slipped away from me and stood up. It seemed it took her no more than a few seconds to retrieve knickers and skirt and recreate the sophisticated woman who had come through my door less than half an hour earlier. “I think we should find that restaurant, don’t you?”

“Yes. Of course. We can pick up a taxi at the corner.”

Casey smiled. “Perhaps it would be a good idea if you - ” Her gesture drew my attention to an open zip and a still semi-erect cock protruding from it.

Dinner was such a pleasant experience I was able to push to the back of my mind speculation about what awaited us later. Casey talked frankly about her reasons for staying in London. Daddy had contributed substantially to providing her with a home but from here she needed to support herself. To that end she had set herself up as an interior design consultant. Her clients, she said, were people with little or no taste but with the money to buy it. Grosvenor Square cocktail parties had been a profitable hunting ground. Now she was dependent upon word of mouth recommendations.

I enquired whether her new way of life would entail substantial changes. She understood