As she was orgasming I slipped a finger inside and started rubbing her g-spot while I kept rubbing her clit with fingers of my other hand. Each time I pushed in on her g-spot she yelped 'Oh God'. I just kept doing it over and over. Her pussy was contracting around my finger and sqeezing and then almost pushing it out.
Then I pushed again and again a squeeze and a pushout. Her stomach was wildly contracting and she was doubling over forward with each contraction. Then I found a place to push in on her clit that made her give a very guteral scream which I alternated with pushing on the g-spot. She was entirely out of control bucking and thrashing around with body bending contractions screaming 'Oh God' and then a wordless noise. This kept going and going, getting more and more intense until after maybe 15 minutes there was a sudden gush of fluid with a completely wordless scream. Then she grabbed my hands and pulled them hard to her and held them still while quivering and shaking and breathing very heavily. After a few minutes her breathing had subsided and she said 'Thankyou, I really needed that. It was a truely extraordinary experience.
Remember, you must never tell my little brother about that or what's going to happen next. I can tell you will never be able to focus on pictures if I don't do something about that' she said pointing at my dripping erection. I came almost right away I had been so turned on for so long.
After that we settled down to do some serious photography. For some of the pictures, now that she was clean shaven and her labia clearly visible she had me rub her before some of the pictures so that she would be all puffed up for the pictures. There was one in particular with the lace drapped around her shoulders and down in front of her. She was standing with her legs spread apart and a single candle low and behind her. Through the lace you could clearly see the silhouette of all 4 labia. That was one of those pictures that she had wanted to get just perfect. All in all I took about 10 rolls of film, 360 frames, which was a lot in pre-digital days. I made her some 16X20s that she wanted from the contact sheet and some enlarged proofs. Some were nudes, some were not.
I later saw one of the head and shoulders shots on her parents wall. She insisted on having a couple of me fully erect as well that she took. It was a great and memorable day that remained unique. I worked with some of those negatives until I dismantled my darkroom. I really need to scan those negatives.