"Absolutely, start as soon as you're ready," he responded.

"Hello and welcome," started Mistress Sin. "I'm Mistress Sin and this little maggot on my leash is one of my slaves. I'm going to be using her to show you some of the fun things you can do to your own sex slave with our products over this short coarse of instructional videos. I plan to demonstrate most of the higher value items but if you'd like a demonstration of any item in the store just write in and ask. Girl here is an utter pain slut with an insatiable libido. She'll consider it a real treat to display anything from our largest butt plug to our heaviest whips and floggers. Also our fucking machines as well as the sleep sacks, harnesses, gags, hoods, cages and our range of latex fetish wear. Basically, if we sell it and you'd like to see it in operation I'll be more than happy to use Girl to make that happen."

Mistress Sin pointed to the vibrator on the stage, "What we have here is a ride on vibrator. Lots of videos of young ladies on the web trying these but very few show how to force an orgasm or incorporate bondage. So let's put that right."

Mistress Sin tugged at Tina's leash, "Stand, slave," she ordered.

Keen not to test her dominatrix's desire to use the flogger Tina almost bounced to her feet.

"Good girl, slave," beamed Mistress Sin. Turning to the camera, "Didn't I tell you she is eager. Now turn around, Girl, and let the customers get a look of your cute butt all wrapped up in rubber for them. Incidentally, ladies and gentlemen, if you want Girl to demonstrate anything don't hesitate to state how you want this little sex slut dressed. If it doesn't interfere with the demonstration, and we hold it in stock, I'll be happy to oblige. Personally, I like to keep her in latex but if you want her naked, corseted or hooded just say the word."

Mistress Sin started taking fetters from the table and securing them to Tina's limbs. "These cuffs are hand made in the UK from the highest quality leather. They are nicely padded and an eye on the tip of the pin on the buckle makes them easily lockable. Now I'm going overboard and putting lots on but they are tough strong items and really the slave is going nowhere once just one set is in place."

Mistress Sin buckled cuffs on to both wrists and ankles. She then continued adding thigh bands and extra cuffs just above Tina's elbows. All the time she kept up her monologue to camera, "Now that I have all the cuffs on I'm locking them in place with a set of matched padlocks. That means one key opens them all. I've heard it said so long as a slave cannot reach the buckle you don't need to lock a fetter. I, on the other hand, believe a slave should know her bondage is utterly inescapable, and that she is under complete control. There, so now the fetters are locked on we can start restraining the slave for her ride."

So saying Mistress Sin took Tina's left wrist cuff and locked it to the elbow cuff on her right arm. She then repeated the procedure with her right wrist to her left elbow. Thus securing her arms in a box tie behind her back. Tina was forced to keep her shoulders back but this was not too uncomfortable.

Mistress Sin then reached down between Tina's legs and opened the crotch zip of the catsuit. Tina felt the cooling air on her sweat-soaked lips before Mistress Sin brusquely forced two fingers in between. Tina gasped involuntarily as the domme extracted the now slick digits and caressed her clit.

"Well, the slut is all slick and juiced up so let's get her aboard shall wee?" Tina flushed in shame as the dominatrix manoeuvred her onto the black domed body of the device before pushing her down to impale herself on the phallus set in the top. Tina shuddered as the item penetrated, and a second protuberance pressed hard up against her clitoris.

"Now we don't want the rubber-clad slut bouncing off once we start it up, do we?" Declared Mistress Sin clipping the ankle cuffs to the thigh bands thus holding Tina in a frog tie. A belt was then locked around her waist and it, in turn, was attached to eyebolts in each corner of the dome with short leather straps.

"So, she's nearly ready for her treat. We just need to pop the cork in the bottle to keep the fizz in." Mistress Sin held the ball of a gag in front of Tina's mouth. Obediently Tina opened wide and her Mistress forced the item in deep behind her teeth. Tina's tongue instinctively pushed back but the strap of the gag held the ball firmly in place.

Experimentally Tina squirmed in her bondage, but there was little give. Novice or not Mistress Sin had expertly bound her to the device. She could neither stand or even slide off the machine. Whatever happened next Mistress Sin was in control.

"Now there are two main controls on the basic set up of this device; rotation and vibration. We'll start with the rotation I think." Tina felt the pallus oscillate within her slowly at first but her tormentor slowly increased the speed. "Now to add some vibration." The vibes hit with a jolt and Tina groaned with lust into the gag. This was going to be amazing.

"Now you'll be pleased to hear there is an app for this that allows much finer control. Also, it is possible to control the device remotely and we are going to offer a random customer each week the opportunity of remotely tormenting this very slut. The customer who induces the most orgasms within a fifteen-minute window, every three months will win a voucher for £100 to spend in-store."

Hold on, thought Tina, I'm going to be doing this weekly if I get this gig? Suddenly the vibes started pulsing in time with the movement of the dildo which seemed intent on tormenting her G spot. Tina shuddered as her body convulsed in reaction.

"Any single purchase qualifies you for entry into this competition, so there's all the more reason to shop with us for your kinky and fetish supplies."

Mistress Sin must have turned the power up all of a sudden as the power of the vibrations increased massively. It was too much for Tina who instantly felt the waves of the climax roll over her. Yet even as she trembled in her bondage the machine continued to stoke the fire.

"Well, that appears to be the first one for this session. I wonder how many more we can rinse out of the little cum bucket in the next ten minutes?"

Tina had stopped listening to her Mistress as the relentless power of the machine she was bound upon was racing her to the edge once more. She was starting to understand the phrase 'too much of a good thing'.

"It appears I have stumbled on the magic setting to produce multiple orgasms in this rubber sex slut as she appears to be on the brink once more. Other items I'll be demonstrating on this collared slave will be our latex sleep sack, our modular cage system our range of fucking machines as well as our slave marking and identification system. That's for those of you who don't want to try to explain to a tattoo artist why you want a barcode on the forearm of your slave...Oh, there she goes again, so that's the second in under ten minutes. I know it's a joke from an old film but I have to point out this machine goes all the way up to eleven. It is also the most powerful machine of this type you can buy."

Tina felt like she was losing her mind. The machine was relentless. She needed a breather, a rest but it just kept on and on. Another climax was building. She wanted to squirm away, to stand up, to even just lift away for a moment but the bondage held her down. Tina wailed into the gag in frustration as she twisted her torso in an attempt at release. Inevitably though the expert pulses of the machine forced another shuddering convulsion from her body.

"Wow! There goes number three, and I'm sure there is time for another one, perhaps two, yet. Ladies and gentlemen as wanton as my slave is, I can assure you she is not special in any regard. You too could induce these reactions in your partner or even yourself if you purchased one of these incredible machines."

Tina heaved in a breath through her nose. Spittle and drool sprayed from her mouth. Each climax was taking less from the energy built up within. The next orgasm seemed to come rushing in on the heels of the last. Tina tried to scream into her gag. It had to stop. It was too much. But it was inevitable. She was going to cum.

"What a slut! Number four already and it looks like a big one."

It wasn't stopping. Her body shuddered and convulsed her eyes rolled up as Tina uttered a guttural heartfelt sob through her gagged mouth. Wave after wave of pleasure on the cusp of agony washed over her. Tina slumped forward. Held up by the belt the machine continued to torment her. Sick inside she knew she it would bring her on again. No man, no woman, no machine had ever fucked her so completely before. She really was a slave. But not to Mistress Sin. It was the machine that controlled her. It had the power to reduce her to nothing. It was the Master of her. She was its slave.

An hour later Tina was still dressed in the catsuit and still locked in the collar. She had been given a drink and allowed to rest on a sofa in Dave's office. Dave, Mistress Sin and the British couple were holding a video conference on the other side of the room. Both Dave and Mistress seemed very happy. Tina was getting her strength back and was ready to ask for the collar to be removed.

"Girl, could you come here please?" Asked Dave.

Weakly Tina pushed up out of the couch and padded over to the other two.

"So how was that for you, Girl?"

"That... That. That was a life-changing experience."

"A good one, dear?" Asked Mistress Sin.

"Oh, yes, Mistress. It was amazing."

"Are you ready to sign? Sadie and Toyah would love you to be part of the team. We've changed the P.O.A. section. I can't show you though, as Mistress Sin signed with her real name."

"God, yes, where do I sign?"