Khadija surveyed the naked bodies in front of her. They were all girls and all final year students at the Khourigba School of Sexual Studies (or 'Triple S' as it was otherwise known). All students who'd opted for Practical Lesbian Studies as one of their final year courses. At least none of them would be virgins, that was certain. There would be none of that breaking in which she rather hated having to sometimes do with first year students. It was only ever women who were permitted to enter the college as virgins. Men had much tougher entrance examinations. The ratio of women to men was always disproportionately in favour of women, and given special dispensation to be so from the Ministry of Education which in most other matters was very particular about maintaining equal opportunities for the genders.

She was as naked as any of her students. Clothes were only permitted in her classes for those lessons where there was a very good reason for them. She welcomed the students and started her lesson by reading from the register, as she would always do until she knew them all. She smiled when she read out Azalea's name: a strange name and one she initially assumed to have been invented. So many girls chose to do this if they were intending to use their qualifications for a career in pornography. However, this was a girl whose career aspirations were in sex therapy and whose reasons for choosing practical studies were stated as being to help her understand the lesbian process rather than to learn techniques. Though, of course, technique was what a student mostly learnt in her classes. She always had a soft spot for Practical Les. Practical Het was often much harder work. Azalea was a slim girl, with small breasts she'd clearly not chosen to enhance as had some of the other students, and a short bob which framed her wire-framed glasses. Such a serious looking girl.

Khadija took a very professional attitude towards her charges, and had studied her students' notes before the lesson. Azalea was a girl who excelled in her more academic subjects, such as Gender Studies, the History of Sex Cinema and the Philosophy of Sex. It was to be seen whether she could show as much aptitude towards practical studies which were, in any case, optional for those who were not intending to have a physical role in one or other of the sex related professions.

"I imagine that all of you consider yourself already fairly expert in this field," Khadija told her class, as she always did for final year students. "Perhaps some of you have taken sabbaticals and think you've learnt all that you could ever learn. But what you will learn in this course is just how little you do know."

Khadija paused for affect and let her eyes roam over the bare breasts and vaginas: some of them shaved, some of them pierced, but neither being so in Azalea's case.

"One thing I do insist on in this class is physical fitness. This is why Gym Practice and Sports are compulsory subjects for all those on my course. As you will soon find out, you will all need every ounce of your physical stamina to succeed. This is no soft option, and those who find they can't stick it will have the option to switch courses for up to six weeks."

She let this sink in. Several students seemed a little nervous: perhaps aware that they had been indulging too much in drinks and drugs and, worst of all, food to see out the course. However, Khadija was accustomed to a relatively high drop out rate. Only those students of the highest calibre would be able to pass.

"For our first lesson, we will begin with vaginal penetration. Or 'Strap-On Sex' as many of you no doubt call it. And as usual I will be demonstrating this on one of you. Each of you will get your turn. I shall be totally impartial, and each of you will have the pleasure of getting to know my body rather well." The girls looked up and down Khadija's muscular frame, her largish breasts held up by muscle as much as by their own tautness. She ran one hand through her short black hair and teasingly supported a breast with her other hand. Some of the students were quite clearly relishing the thought of having sex with her, but she could see that some others were rather less sure. It was those she addressed next.

"Not all of you will always be having sex with exactly the kind of woman that you may prefer at the moment. But sexual technique isn't about æsthetics or choice. It's about performing well, and you'd better get used to it."

She picked up a large black dildo attached to a specially designed belt and strapped it around her waist. Her shaved vulva squeezed through the opening at the front, while its large plastic length protruded out in front of her.

She ran her eyes over her students.

"So, who's going to be the first here to assist me in the demonstration. Is it going to be you, Fatima?" she asked a slightly chubby girl who blushed slightly. "Or you, Amna? Or 'Pussy Willow' as you've rechristened yourself. No. I think, it'd best be Azalea. Come here, girl! And you best take off your glasses."

Azalea blushed even brighter than Fatima. Khadija could see the blush spread over her pale shoulders and to shine most brightly from her cheeks. But she stood up, placed her spectacles on the shelf where Khadija kept her sexual aids, and quite nervously walked over to her teacher. Khadija took Azalea's hand with a reassuring squeeze and addressed the class.

"As usual, I will not speak to or lecture you during the demonstration. But afterwards I will ask you questions about it. There are two things that I want you to concentrate on. One is: what am I doing right? And the other will be: what is Azalea doing wrong? And I expect you to pay complete attention."

With that, she put her arms around Azalea and, as much to mark that the demonstration had now begun as to put her student at her ease, she put her mouth onto Azalea's and started kissing her long and deep. She could see that, despite her initial shyness, this was one student who would almost certainly stay the course. Azalea's tongue and teeth took to Khadija's attention with ferocity and desire. Here was a girl who genuinely enjoyed girls. Not like some students who viewed lesbian sex as just a necessary ingredient of a successful career in the voracious sex industry.

This very enthusiasm made the demonstration much easier. Khadija had seen that she'd judged Azalea well - but then someone with her many years of experience would only be expected to. It was a fairly natural progression from kissing and cuddling to full body fondling and cunnilingus.

She guided Azalea onto the hard cotton mattress where the sex would be at its most active, and got her to suck and gobble at her dildo while she explored the hair around Azalea's crotch. Such slender thighs. Such a thin waist. Those long thin arms wrapped around her waist. She liked the smell of this girl's crotch. She was clearly properly aroused. But she could see from the relatively undamaged state of her vaginal folds and the lack of scratches or scars around there that she was not a girl who practised full penetration on a daily basis.

But that would all change. Particularly in the fisting and bottle-entry classes towards the end of the course. She eased her saliva-dripping fingers into Azalea's tight anus, and smiled with grim satisfaction as the girl yelped with the sensation. Not a virgin there either, Khadija noted, but a girl with more need for practice.

And then, while the other girls watched, cross-legged on the gym floor, some of them holding hands with their lovers or their classmates, she manoeuvred the sex towards penetration. In later classes, this exercise would have a much shorter prelude. Girls would have to learn how to cope when they weren't ready or even when they had periods. The industry many of them had opted for was not one that paid much attention to such niceties.

And then she eased the dildo in, slowly and gradually, feeling Azalea's resistance vanish with each thrust. She was being gentle now, but soon she'd have to take the girls more brutally and more brusquely. And then with Azalea's legs splayed on either side of her muscular hips and her head and upper body below her on the mattress. Khadija began thrusting away, getting steadily faster, driving it with the rhythm that she could feel emerging naturally from her student, who was soon lost in desire and abandoned technique and artistry to passion.

Azalea's body was sweating profusely as she jigged back and forth to a rhythm that was becoming steadily more manic, more frantic and more desperate. And then she burst into cries and yelps and even a small shriek as she became lost in love. Here was a girl who with the aid of the necessary breathing techniques should be a natural in the Displaying Sexual Satisfaction classes.

She kept going at the front for a full five minutes. This wasn't a lesson in stamina, however, so she varied the positions so that she was under Azalea and the student was above. Then doggy style. And she probed the entrance to Azalea's anus with the blunt end of the dildo, now shining and dripping from Azalea's vaginal emissions. Azalea gave a gasp. She was clearly not sure she was ready for something quite as large as this dildo inside her.

But Khadija knew where to stop. That would be for another class. She slowed down the tempo a little, and let Azalea collapse, weakened and groaning, onto the mattress, while, panting slightly, but not too much, she turned towards the class.

"In a minute, I'm going to ask you all to indulge in the same activity with your partner. There is at least one mattress for each pair. And for this first lesson, and for this lesson only, I will allow you to choose your own partner. In future, you won't have that choice. But first of all, can you tell me what you've learned?"

After the questions and answers had been finished, Khadija stood back as for each pair of girls, one of them strapped on a dildo while the other prepared for penetration. She was interested to see which of the girls would choose to partner Azalea, who had by now recovered enough to sit up, still flushed and hot, but also still quite excited.

It turned out to be Amber Light, formerly known as Amina, who made her way to the mattress where Azalea still lay. She was a big-boned girl, quite striking and tall, dwarfing little Azalea, with straight dyed-green hair to her shoulders, a shaved vagina, who sported jewellery in her crotch as well as on her nipples, in her navel and dangling from her ear lobes. A glance at that shaven crotch, with the vulva falling out from use and abuse, told Khadija all she needed to know. Amber was a girl who practised often and passionately, and who would also manage to stick the course to its bitter end.

"Come on, girls!" Khadija cried, clapping her hands together. "Put some passion into it! Show me that you're enjoying what you're doing!"

As the semester proceeded, Khadija got to know Azalea rather better. Of course, she got to know all her students better, but Azalea she got to know better than most. She was such a relatively sensitive girl, curiously vulnerable. Quite unlike most of the girls who chose practical subjects. They were girls who really just didn't care at all about anything. Fucking, shopping, eating: it all seemed to be much the same for them. And a remarkably high proportion of girls who chose to enrol for Practical Lesbian Studies had no homosexual leanings at all. They had just passed the point of caring. That was all.

It was inevitable that Khadija would find an excuse to invite Azalea back to her own bed in her town centre apartment, just between the faded mosque and the mall. It wasn't just that Khadija especially wanted to make love to Azalea. That was virtually a given fact. It was also that lecturers and other teaching staff were expected, indeed encouraged, to get to know their students in this way. It showed that they had a proper regard for their charges' progress. This romantic encounter, like all the others in the academic year, would be entered into her records under a suitably euphemistic heading.

However, Khadija was not the sort of person who would lessen the erotic pleasure of the night by telling Azalea of her more selfish reasons for inviting her back. In fact, she wasn't even sure that Azalea had quite appreciated how inevitably her invitation would lead to sex. When she closed the door to her flat and began disrobing Azalea while kissing and petting her, she wasn't at all convinced that this turn of events might not have taken the student by surprise.

Surprised or not, Azalea soon lent herself to the passion, her short pleated skirt dropping to her ankles, her silk blouse unbuttoned and thrust back over her shoulders and arms, her knickers easing slowly down her thighs, and her eyes sparkling with passion and desire. Their tongues and mouths came together with a clash of ecstasy, while Khadija slipped off her tracksuit. And soon the two of them were naked and embracing on Khadija's futon, her stereo automatically clicking on and playing the soft Oudh sounds she enjoyed so much.