To get to Horus House from my flat, you go out of my front door, turn right and walk about twenty yards along the paved path. That puts you in front of the main door to Horus. We formed a little procession, first James, then Annie, then Julia, then me and finally Emma. We had our hands behind our heads again and we had to goose-step, purely for Mark's amusement, which was a bit painful as our bare feet smacked down hard on the paving stones each pace, but if Mark wanted us goose-stepping we goose-stepped and that was that.

Once we were inside, we were directed into my office, which is the first significant room on the ground floor, and waited - able to relax our arms for a few minutes, thank heavens - while Mark went and checked on... well something. We didn't need to know, we just stood in a line and loosened our arms.

Then he came back and said "Right, you're going to be working in the main lecture room. There's the whole population of Horus in there, and those people from other Houses I mentioned earlier. You know what you have to do, and if either James or I see anything to be unhappy about you ladies are going to wish we hadn't - wish it like you've never wished anything before in your lives. Get me?"

We all politely admitted that we'd got him. And we believed him, too; at this point we were totally clear what our options were - and weren't. He nodded. "So from now on, silence unless you're told to speak - which won't happen until you're inside."

We all walked silently to the door of the lecture room, and James went in. To give you a picture, it's a fifty-seater room, with the seats arranged in three semi-circular rows, each higher and longer than the one in front of it. From the doors at the back, which we were standing outside, four very broad steps split the seating area in half, leading down to the front of the room where there was a dais about fifteen feet square and three feet high, with one step leading up to it on each side.

James went in, and from outside the door we could hear him clearly. He got a distinctly excited-sounding cheer on entrance, then it took a few seconds to quiet down for him to speak.

"Gentlemen, you all know that teaching staff here often refer to Horus House as 'The Zoo', which is very offensive, to say the least."

That got a murmur of agreement. It's true, as I've mentioned, but I've never liked it. No help for that now, he was going on. "We all know, though who the most dangerous wild animals in the Zoo are, and some of us have been put in the Clinic by one or other of them." Some laughter again, some of it sounding rather wry.

But he was getting to the point now. "However, any animal, however wild and fierce, can be tamed - and trained to perform - if you know how. So Mark and I have set about recruiting the Zoo's wildest animals into a circus for your entertainment, complete with performing animals.

"No need to be quiet or nervous, all the animals to perform here for your amusement tonight are completely tame and if they still have teeth and claws they don't dare use them. So, let's meet them. Please welcome... first, Miss Annie 'Waterwings' Jarvis!"

Mark opened the door and Annie ran in, hands behind her head, as we'd rehearsed, using that high-stepping, toe-pointing chorus-girl run we'd been practicing. She was met by about three seconds awed silence, then a bedlam of whoops, laughter and cheering.

As she reached the bottom of the gangway and started high-stepping across the floor to the dais, he shouted over the still hugely rowdy room "Julia 'Jane Wayne' Menzies!". There was another deafening outburst as Julia started her high-stepping run down the gangway.

Before she got to the bottom, here he came again with the moment I'd been dreading. "And now please welcome the wildest critter of them all, now tame enough to lick your boots, Megan 'Queen Kong' Rowlands!"

Well I'd known that was my nickname, but since nobody used in front of me I'd never bothered about it. And I still wasn't bothered about it. What I found it very hard to do was go out in front of that crowd. But there were no choices, so when Mark opened the door I high-stepped out, to a veritable storm of cheering and laughter. My authority and my combat ability had given me a massive presence in Horus. I'd been the big fish in that pond almost since I'd arrived. As I pranced down the steps, breasts bouncing a little painfully, hands behind my head, backside visibly bright red, I could feel myself shrinking - a minnow amongst a shoal of mocking pike - and it was utterly hateful. Far the most horrible moment of my life so far. By a mile.

As I ran off the steps and headed for the step up to the stage he called "And finally, the queen of the whole fucking jungle, Emma 'The Viper' Phelps!" and when I ran up onto the stage and turned to face them, the three of us with arms across each other's shoulders, high-kicking in time together like a chorus line, there she was prancing down the gangway, face calm but eyes darting wildly this way and that. Emma is cool as ice in most situations, but here even she was feeling it and close to snapping.

She joined us and we high-kicked in unison, more or less, like a chorus line in a brothel. At James's nod, we pranced forward to the front of the stage and kept working, keeping our steps in time, pointing our toes on the lift, raised leg horizontal. The bear pit in front of us was laughing, shouting remarks, gesturing, mocking, and the fact that it sloped up so that the top row was well above us made it even more in our faces and intimidating.

The lectern that normally sits at the centre front of the stage was at the back on stage left, and now Mark grabbed the mic from there and came to the front beside us. "OK gents, if you don't keep it down a bit you won't hear what I've got to say - and you'll want to, you really will."

After about thirty seconds and some shouting of "Shut the fuck up!" by various self-appointed stewards, it was quiet enough to hear us thumping and panting as we worked, and the sweaty slap of Annie's breasts bouncing, slightly out of sync with our stepping.

Mark smiled. "Thanks. Now later there will be a raffle amongst the club members for what four lucky bastards will have the attentions of one of these ladies until dawn, but in the meantime we're going to have some fun that everybody can join in with. We warned you to bring an iPad or phone and join the net here. You will see a private message group called 'Ideas'. You can join it with your email and the pass 'Playtime' with a capital 'P'.

Just write in there your ideas for what you want these ladies to have to do. Questions someone has to answer, things one or more of them should have to do, whatever would turn you on, make you laugh, or make them shudder. Anything you'd like or they'd hate.

"Don't say who you want to answer or do what you suggest, we'll pick somebody - maybe more than one - just come up with ideas, and we'll pick the fun ones and make them do it. Right, go."

James also had a mic now, behind us, and only a few seconds later he said "They're starting to come in. Ladies, back to the back of the stage, keep working. Emma, break off the line, front and centre... And nobody said you could stop stepping, bitch.