Around the mid-1960s, when my wife was in her mid-30s, she began to pose for me and my camera, nude or partly so.  By then I was a competent photographer, with good quality equipment, and I also processed and printed my films.  I worked in monochrome, as did most amateur photographers at the time.

On one occasion not long after my wife had started posing for me, I was working late in the spare room which served as my office and darkroom.  I was printing pictures of her that I had shot earlier in the day.  She had gone to bed some time before, but suddenly knocked quietly at the door and asked if she could enter.  Once I had put away the light sensitive photopapers I let her in and returned to my seat in front of the trays containing the developer, washes and fixative.  My wife came and stood right beside me and started to look at the already printed pictures sitting in the final rinse tray.  She was wearing a shortie nightdress that just reached below her bottom and pussy.  Suddenly, as she looked at the pictures of herself naked, she gave a little cry and a sudden jerky movement and 'came' involuntarily, squirting a clear, syrupy cum down her right inner thigh.

I slipped my free, left hand between her thighs from behind and felt the warm, slippery cum there, spreading it gently around and working my hand up until it made contact with her open labia - which promptly made her cum some more!  We both enjoyed a few more minutes of this, but then I had to stop my darkroom work for a while!  She ended up sitting on my lap, facing me, and we kissed while my cock thrust up into her and my hands fondled her small but firm breasts.