As soon as Kimberly and Kaia were out of earshot down the hall, I noticed something new on the carpet next to the lounge chair where Kim had sat. It was a large yellow envelope.
Sheana saw it too and picked it up.
"I wonder what this is," she said, opening it inquisitively. "Some photos - oh my goodness me!"
She knelt quickly next to the chair, staring at the photos in her hands. I tried to peer over her shoulder, then grabbed some from her when I realised who was in them.
It was Kim's parents, Mr and Mrs Kitchener. In the photos, they were both nude. And not only nude, but they were doing it together - they were having sex.
The photos had obviously been taken in the waterbed room, but the location was by far the least interesting detail. Our wildest dreams about Mr Kitchener came to life as we gawped at his bared erection disappearing into his wife's mouth as she knelt before him. The top half of his face was out of the frame, but there was no mistaking his perfect smile. The next photo showed the top half of his face only as his mouth burrowed itself deep into his wife's wide-open vagina as she lay on the bed with her legs over the edge, his hands spreading her thighs wide apart.
The other photos were similar but went further - coloured vibrators appeared, used on and in her vagina and anus. In one, Kim's mum was kneeling up on the bed side-on to the camera with the red devices projecting from both of her lower orifices as she extended her long pink tongue to the flushed head of her husband's enticingly large erection.
Sheana and I passed them backwards and forwards silently with shaking hands. It was almost as good as actually spying on them in action. My own pussy was thoroughly soaking again, and I knew Sheana had to be feeling just as horny. When I got to a close-up of Mr Kitchener's lovely long cock just starting to nose its way into his wife's receptive cunt, I could hardly stand the need to bring myself relief on the spot. I clenched my thighs and shivered as I imagined his experienced cock sliding into me searchingly, stretching open my shiny lower lips. If only he hadn't gone away, I thought, I would have loved to have made him an offer he would have found hard to refuse!
It was Kaia who returned first, interrupting our drooling over the explicit pictures. She was unexpectedly reclad in her leather teddy and the top half of her face was also now covered with an elaborate mask of matching smooth leather. It was a sharply confronting look but undeniably one which spoke of sex. She put something on the desk before standing over the top of us, accusingly.
"Just as we suspected, you're sticky-beaking into some very private things." She sounded chillingly stern, as though we were in serious trouble, but then her wicked smile reappeared.
"They're unreal, aren't they? Has Kim's dad got a good-looking cock or what?"
She knelt with us to look through the photos for a moment before suddenly grabbing them all and stuffing them back into the envelope.
"Now shut up and listen. Kim said she was doing something else for a while so I'm s'posed to teach you sluts a thing or two. So have a good look at this!"
In her hand she held a thin silver chain with a clip at each end.
"Bet you've never seen one before, have you?"
She was certainly right about that.
"Guess what? They're nipple clamps!"
We gasped together as Kaia immediately unzipped her teddy down the front and tugged the zippered gap apart to thrust her petite golden breasts shamelessly into view. With great care, she placed a padded clip over each stiff nipple before shutting them with a twin snap. Sheana and I winced and Kaia swore but left them on, gritting her teeth and clutching her hands tightly around her covered scalp as we stared at her connected breasts and tried to imagine the sensations she was experiencing. Was she going through heaven or hell...or both?
After a full minute of self-torture, she removed them gingerly with another swear word or two. Her released nipples clearly showed the imprints of the clamps, being flattened and distended to an astounding degree. She cupped her breasts to inspect the damage.
"God, that is just so incredible," she said at last, then sang: "It's a fine line between pleasure and pain..."
She grinned at us.
"I guess none of yous chickens wants to try it?"
"No way!" we said together.
"Yeah, thought so," she sneered, getting up to retrieve the object she had left on the desk. "Well, have a look at this then!"
She held up what I presumed was an elaborate vibrator, a strangely shaped purple penis with weird bits sticking out of it. Kaia fiddled with the base and it came to life, buzzing as it twisted and shook. We all laughed at the sight but for me, there was tension too, curiosity as to how it would feel inside my own vagina, wondering whether Kaia was about to give us another demonstration, to let us watch as she slid it inside herself and switched it on. I had never held one before now but every article I'd read said they were fantastic for giving women as many orgasms as they wanted. I wondered if there was another one around I could try - using this thing which had already been inside someone else (Kim? Kaia? Mrs Kitchener?) didn't seem like a very good idea. But before any of us had the opportunity to play with the vibrator, Kimberly reappeared. In a big way, as usual.
She had also dressed but this time she was covered by a slick black rubbery skintight outfit connected by suspenders to similar leggings. She wore nothing between her legs, her dark curls there still open to our view. With a mysterious smile for us, she opened a small satin-covered box she had brought with her.
"Put that thing down, Kaia, you can play with those any old time. Now, before we go anywhere, girls, you'll need to wear these." From the box, she produced two elaborate masks of black velvet and sequins, indicating they were for Sheana and myself. Like Kaia's, they were designed to conceal our identities while leaving our mouths unrestricted in any way.
But I still didn't understand why they were necessary until Kimberly produced the box's final item: a camera. The sexual exhibitionist who had been lurking inside me all evening silently jumped for joy.
"Come on, girls, put them on, I've been looking forward to this part all night."
We quickly donned the masks and giggled at each other's new appearance. Inside the mask, there was an immediate sensation of becoming someone or something else, an anonymous naked creature, utterly uninhibited, willing and able to fuck, suck, lick, finger and jerk off anyone I wished to honour with my sexual services. I couldn't wait to strike some especially sexy poses for the camera - the whole idea excited me so much.
Silently, Kim directed us to follow her. We did so with barely suppressed excitement, wondering where we were going.
To my delight, she led us back to the mirrored waterbed room but before Sheana and I could so much as exchange a knowing glance, we stopped dead still, staring in shock at the bed. Of all the possible surprises Kim might have arranged for us, this was definitely the least expected.
There was a man tied to the bed.
He was young, about our age or a little older, spreadeagled on the bed face upwards, blindfolded with a black sash over a mask identical to our own. His wrists and ankles were tied to the chrome metal bars of the bedstead with smooth but tight black satin ribbons. He was blonde, with a completely hairless chest but well-defined muscles stood out all over his beautiful body, with an especially impressive abdominal region. A sizeable bulge in his tight black briefs advertised tantalising goods waiting within. Otherwise, he was naked - and naked just for us? I could only hope.