I knew which one was her out of all the guests. First of all, she came by taxi. Every other guest arrived in cars, some worth more than the average house. Two came by helicopter. I’d cleared the back garden ready for that eventuality and lucky I did as the dogs wouldn’t have been too happy to have their stomping ground interrupted by giant metal boxes descending from the grounds. They were in the kennels with one of the keepers, out of the way. The busier it got, the more I wanted to join them. I had already made enough small talk to last a lifetime but still more people kept arriving.

I had a horrible feeling she wasn’t going to come. It was ten past eight already and after scanning the faces of everyone there, I didn’t see anyone I didn’t recognise. I headed for the front door, stopped twice by the sound of spanking going on to my left, enough of a distraction for anyone. I glanced that way. Two women were bent over a glass table, a crowd gathered around them, watching them take firm blows to the rear.

Normally, I would have stayed to watch but I had something else on my mind. If she turned up of course.

I walked outside, the night air still warm despite the breeze. Glancing around, I looked at the collection of cars, no one to be seen. Then in the distance, a pair of twinkling headlights growing brighter as something made its way up the drive. I waited, hardly daring to hope it was her.

It was a taxi. It stopped directly opposite me and I watched as the back door opened and the most beautiful woman I’d ever seen stepped out. The agency had clearly gone all out with making sure my desires were met. Just looking at her in that shimmering dress, the fabric tight against her chest, made me hard. That cleavage, I wanted to bury my face in it. She looked scared too. I knew she was acting but it was a bloody realistic performance. Her eyes darted about from left to right as she walked towards me.

“Oi!” the cabbie shouted after her.

She jumped in fright, spinning back round to face him.

“Fifty quid love,” he said.

She held out three notes to him. “I only have thirty on me. I thought it was twenty to get out here.”

“Don’t know where you got that from, it’s fifty quid love or I call the police out, spoil your evening a bit, wouldn't it?”

“But I haven’t got fifty.”

“Not my problem love. You better get it.”

I was already down the steps and crossing over to them both. The cabbie was out of the door, marching over to her and she looked on the verge of tears. “Fifty pounds to get here?” I asked him, blocking his path. “Is that right?”

“Afraid so, guv’nor,” he said.

“Then perhaps you could explain why your meter says ninety twenty?”

He glanced behind him, cursing quietly as he did so. When he turned back, his angry expression had been replaced with an ingratiating smile. “Must have been reading it wrong. Nineteen twenty it is.”

“Here’s thirty,” I said, holding a couple of notes out towards him. “Put the tip towards an eye test.”

“Much obliged,” he replied, climbing back in and setting off away from the house. I turned to find Ms X still standing in the same place, still looking on the verge of tears.

“Here for the party?” I asked.

“Yes, sorry, are you the doorman?”

“You have an invite?” I asked, repressing a smile. That was a nice touch, her pretending not to recognise me. She was a good actress, I’d give her that.

“In my handbag.”

She dug it out, passing it to me. “A black one,” I said, letting my smile broaden. “You know the rules then?”

“Of…of course I do.”

“Then perhaps you could explain to me why you’re not topless.”

Her cheeks flushed deep red. “Ex…excuse me?”

“You said you know the rules. Oh, I get it. You wanted to wait until the taxi was gone. Well, don’t worry, he’s out of sight, out of mind. You better hurry though, the matching is due to start soon and you’re late.”

She looked at me closely, through her fear I saw something else, a spark of something. I got the feeling that fear might be real. Maybe she hadn’t been working for the agency for long, maybe she was having second thoughts. But that other thing inside her, that fire, that was visible too. She’d been caught in a lie, she didn’t know the rules and had tried to bluff her way out of it. But she’d been caught and now she had a choice. Either admit the truth that she was acting and ruin the whole thing, maybe run home to mummy. Or brazen it out. I was genuinely curious as to which it would be. I hoped the latter, I desperately wanted to see what was inside the swell of her dress.

She took a deep breath, gulped, then opened her mouth. A tiny quivering smile crossed her lips. “That’s right,” she said, reaching for the front of her dress and stretching the fabric downwards.

My eyes widened at the sight, my cock getting so hard it ached as the cloth slid down in her grip. She still looked scared but defiant too, as if trying to prove me wrong, like she thought I knew she wasn’t bold enough to do this.

Her nipples came into view, stiff, light pink, puckered in the evening air. I wanted more than anything to take them into my mouth.

About a third of the women inside were topless at that moment, their breasts flaunted as they paraded around the house. That was the nature of my parties. But they could whistle as far as I was concerned. These were flawless, attached to a woman who looked far too innocent to be doing this.

She pushed the dress under her breasts, it sat taut in place, pushing them upwards, leaving her obscenely exposed as she mashed her fingers together, squirming in place, her cheeks still burning red.

“Excellent,” I said, trying not to let her see my reaction. “Perhaps you would like to make your way inside.”

I motioned towards the door, holding it open for her to walk in. She looked at me as she passed me, opening her mouth as if to say something.

“Thank you,” she muttered before walking away. Her fingers were shaking, she was clearly terrified. I, on the other hand, was more turned on than I’d ever been.