A previous partner got me interested in photography as a hobby and its something I still enjoy when I have the chance. So when Sir approached me about taking some pictures for a couple he knows, I jumped at the chance.

He did warn me that the pictures they wanted would be pretty explicit, and that they wanted someone from 'our community' to take them, rather than a professional who might not be as understanding or as discreet.

Once I agreed, I left Sir to negotiate all the details. The shoot was to take place in their converted garage, and all the pictures would be saved to a memory card they would give me, and i would hand back at the end. Sir would be there as a chaperone, and my "assistant", and to top it all off, I would actually get paid!

I decided to use some of that money to hire some extra equipment I'd been wanting to try out - some lights, reflectors and such. Since I was getting paid, I wanted to do the best job I could.

We arrived mid-evening. Their house was an average suburban semi-detached, with absolutely nothing to distinguish it from all the others. The couple who answered the door were in their late 30s. They were both attractive in an understated way, the kind you might pass in the street without giving them a second glance.

They welcomed us in and helped carry my equipment through to the ex garage. When they opened the door, I had to stop for a moment, it was so unexpected.

The decor was completely different to the rest of the house. The overall impression was of black velvet and a deep wine red, with dim unobtrusive lighting. As my eyes adjusted, I started picking out more details. The wooden furniture I'd only seen before in specialist videos, the rubber matting on the floor, the wall full of ropes of various sizes and colours, all hanging neatly. And then there were the pulleys and hooks hanging from a wooden beam that ran the length of the ceiling. Given how dim the room was, I was glad that I'd splashed out on the extra lighting.

Our hosts introduced themselves properly- we'll call them Amanda and Ted - and we made small talk for a while before I steered the conversation to the photos and what they were hoping for from them. That turned out to be mainly a series of explicit and "raw" pictures for their own enjoyment, with a few more artistic ones that they could possibly turn into framed prints.

It didn't take long to get set up whole Amanda and Ted went upstairs to "get ready". I was just taking some test shots of Sir to dial in the camera and light settings I wanted when they reappeared. The transformation was startling.

Ted wore leather trousers and a matching leather waistcoat, leaving his chest and arms bare. On some people it would have looked awful, but on Ted it worked, showing off his surprisingly well defined muscles. He obviously worked out. You don't get abs like his without spending time in the gym.

Amanda's outfit was more minimalist. In that she was completely naked. Her only clothing was the band holding her hair tied back in a plait and a pair of black stilettos. Despite that she carried herself with a confidence and assurance I hadn't seen in her when she was fully dressed.

I took some simple portraits of them, individually and as a couple then stepped back out of the way to watch. Ted picked out a rope and bound it around Amanda's chest wrapping over, under and between her breasts. They moved with the grace of a well rehearsed ballet, Amanda lifting her arms and turning as Ted tied intricate and decorative knots.

I stayed back, using the zoom to capture close ups and asking Sir to move lights and hold reflectors. At first it felt strange for me to be giving him instructions, but I quickly got lost in trying to capture the artwork taking shape in front of me and didn't even notice when I stopped making requests and started giving orders.

Ted had tied Amanda's arms behind her back, the rope running in what looked like a continuous spiral from her elbows to her wrists. The pose forced her chest out, framing her breasts against the ropes that surrounded them. I wasn't at all surprised to see her nipples were erect, and to tell the truth I was more than a little aroused myself, despite concentrating on the camera.

He helped her to the ground gently, and Amanda knelt in a position I was familiar with from Sir's training - knees spread wide, back straight, displaying herself proudly. More ropes were produced, this time binding her ankles to the top of each thigh, with an enchanting diamond pattern running down each leg.

I captured each step of the process, the concentration as he tied and tested each knot, the ropes being placed carefully to create his chosen design. The look of serene calmness and trust on Amanda's face as her partner completely immobilised her, the sweat glistening on her exposed breasts and the telltale moisture forming on her bared pussy.

With her arms and legs both now tied, I thought they were finished, but I was wrong. Ted picked up two longer and thicker ropes, passing them through the pulleys in the ceiling and attached them to the ropes already holding Amanda. Slowly but steadily he lifted her into the air, first an inch, then a foot, then another foot.

He tied of the suspension ropes and then inspected his handiwork, walking slowly around her as if looking for any flaws. Satisfied, he gave her a gentle push which started her swinging and slowly spinning, one way then the other. The sound of my camera shutter was a near constant backdrop.

As a final measure, Ted brought out a cordless vibrator. Amanda was powerless to resist as he teased orgasm after orgasm from her, her cries growing louder and more insistent after each one. I'm proud to say that I somehow kept my composure and didn't fall to my knees in front of Sir at that very moment.

The performance apparently over, Ted and Sir pulled a table underneath Amanda and she was carefully lowered onto it before Ted began untying her. The process was even more artistic than the tying had been. Each rope removed revealing a delicate pattern of markings on her flesh where they had dug into her skin.

With the last rope removed and Amanda helped down from the table, I felt like I should applaud. Instead I walked up to Amanda and asked if I could hug her. She graciously accepted and as we embraced I felt tears stinging my eyes, as if I had been the one being bound.

It wasn't long after that until I was handing over the memory card and we said our goodbyes. I felt a pang of regret that I wouldn't be able to see the photos I had taken, but at least the scene was imprinted firmly in my memory.

When we arrived home, I noticed an evil smirk on Sir's face. He hadn't forgotten that I had been ordering him around for most of the night, and it seemed that some punishment was called for. That perhaps is a story for another time though.