My sister and I stood outside my father's study in trepidation. Janet tapped gingerly on the door. "Come in," bellowed my father in his best courtroom growl. Janet and I stepped inside and found father, seated at his desk, his wife Amanda, 35, standing beside him.
To my surprise, she was still clad in the humiliation lingerie Janet and I had ordered her to wear for us all day - a leather, quarter-cup black bra, black leather garter belt, black seamed stockings and high heels. My father, Judge John, was stroking our stepmother's bare buttocks in a proprietarial way.
"Be seated," said my father, a 60-year-old, distinguished looking High Court judge. Janet and I sat down in two chairs which had been placed in front of father's large desk.
Then he cleared his throat, as if he was about to read out a judgment in one of his courts. "Janet and Jason, I am really very, very disappointed in you," he said.
"I'm very sorry, daddy," Janet said. At 22 and his only daughter, she could get away with "daddy", but I knew very well that even though I was two years younger, I could not.
"And you, Jason?" asked my grey-haired parent, still stroking his wife's stunning arse.
"I'm very sorry, sir," I mumbled.
"I should damn well think so," my father thundered. "You discover my dear wife's little secret, the pictures she posed for 10 years ago, and you actually play out the scenes from the cards with her. I'm very, very disappointed."
The silence hung in the air. "We're sorry, daddy," Janet said, once more.
My father harrumphed. "What appalls me is the total lack of - what shall I say? - originality."
I gasped. "Lack of originality, sir?" I queried.
"Yes, dammit," snapped my father. "You go through the playing cards, picking scenes. It's ridiculous. It's like something out of a pornographic movie it's so banal.
"I thought I'd raised two intelligent, bright children. You're a great disappointment to me."
Once more there was a long silence, broken by my father ordering: "Feet wider, my dear." Our stepmother placed her high-heels farther apart and I'm sure my father was fingering her pussy from beneath her buttocks!
Father then went on: "What I propose - no, let me re-phrase that - what I order, is that you Janet and your brother here, have a punishment competition with your stepmother. You will be the punishers and she, to coin a somewhat legal phrase, will be the punishee."
I could hardly believe my ears and I know my mouth was gaping wide!
"Tomorrow morning, you Jason will go to a sex shop in Wardour Street, Soho, where I have an account in the name of Judge Jeffries." My father paused, smiling at his judicial joke. Judge Jeffries was, of course, one of old England's most cruel "hanging" judges.
"The manageress at the shop is - how shall I put it? - an acquaintance of mine. From her you will purchase punishment equipment to use on Mandy here, but you will not exceed the sum of 100 pounds. Do you understand, boy?"
I nodded. "Yes, sir," I said, hardly believing my ears at my father's instructions.
"In the afternoon," he went on, "you, Janet will visit the shop and also charge purchases to my account not exceeding the sum of 100 pounds. You understand me, missy?"
Janet nodded. "Of course, daddy."
My father pressed on: "It's Friday today, so tomorrow morning I shall call Miss Hardcastle and inform her that you will both be calling.
"When you have returned with your purchases - which you will not reveal to each other - you will be given one day to rehearse the punishments you are going to inflict on Mandy. You, Jason, will rehearse on Monday - and you, Janet, will not spy on the proceedings, is that clear?"
My sister, also hardly daring believe what was being ordered, agreed.
Father proceeded: "On Tuesday evening at 8 o'clock, Jason you will perform for an audience of myself and Janet. You will have an hour to take Mandy through the punishment routine you and she will have rehearsed the day before.
"On Wednesday, you, Janet, will rehearse your particular punishment with her and perform it on Thursday evening before myself and Jason, here. Understood?"
Sis and I nodded. "What happens in the competition, daddy?" Janet asked.
"I was coming to that," said my father, his fingers still working between Mandy's lovely legs.
"On Friday night at 8pm, we will all convene here again and I will call on Mandy to give evidence about the punishments you have performed on her, their efficacy and so on. I will then give my deliberations and name the winner.
"The winner will, from 9 o'clock on Saturday morning until 9 o'clock on Sunday night, enjoy the services of this lovely creature" - and here he gave Mandy a warm smile - "as their slave.
"The winner, of course, will be expected to be magnanimous in his or her sharing of the slave with myself and the loser of the competition."