He was looking at the front of my abdomen (not that he hasn't seen it often before). It was bulging out very obviously - probably sticking out at least an inch and a half. The protruding part was round, and very hard to the touch. It extended from just under my navel down to my pubic hair. He immediately put his hand to it and felt it. I protested, but he insisted on examining it. It told him it was my bladder, and that I needed instantly to empty it, because it was so painful. Even I was a bit intrigued at its appearance - I had never before seen myself so swollen. Now I am well past fifty, and several pregnancies have left my abdominal muscles a lot less firm that they once were, so usually my abdomen protrudes a little, but it usually feels soft. Now there was no softness, it was all hard, and protruding as I had never seen it before. My mate was fascinated, and kept wanting to look at it and feel it. I was tugging away, anxious to get to the bathroom, fidgeting, and doing the classic pee dance, shifting from one leg to the other while he gently palpated my extremely full bladder. While fidgeting, I unhooked my bra and threw it off, planning to head for the toilet and then a shower.
I told him how much it was hurting, and to just let me go, but he begged me to delay a moment. I could sense he was not only fascinated, but aroused. My abdomen looked and felt as though it had a baseball inside. I could hardly bear the pain. He reached up and touched my breasts, and said something - I don't recall the words, but the idea was an invitation to sex. I reacted by indicating OK, as soon as I go to the bathroom. His response was "No - the way you are now!" I remember his words. Obviously my badly distended bladder and intense discomfort was a turn-on for him. It wasn't to me, but I just wanted to get it over with so I could relieve myself. I gritted my teeth and told him OK, but hurry, and that I couldn't have him on top of me because my bottom could take no pressure.
I didn't watch him, but I know he was undressed in seconds. I wasn't much interested, just wanted to get it over with and end the agony, but I was, rather reluctantly, willing to accommodate him if I could just hold on long enough. It did occur to me that my pelvic muscles were so tightly clenched that he might not be able to even enter me. What did happen was that we had a big mechanical problem. I knew he couldn't be on top of me, and I couldn't even lay on him. We tried to couple standing up, but my abdomen was so hard and swollen we couldn't get the angle right. Finally he just laid on the floor (in the heat, the bed was far too hot) and had me lower myself on top of him, in a sitting posture. To my surprise, his organ entered me easily, despite my tightened muscles. He said something about me feeling like a vise, but at the time I didn't care.
Then I experienced a strange feeling. I've had full-bladder sex before, but never in a condition this extreme. At first the pain was awful, but as he moved a bit, I must have been aroused more than I could realize. The extreme pressure and stretched, swollen feeling was still there, but it changed a bit - it was no longer painful, it was even a bit enjoyable. I couldn't understand it. Suddenly I climaxed, quite unexpectedly. For a moment I feared losing bladder control, as I understand some women do when this happens, but mine held on. My muscles stayed tight. His orgasm came a few moments later. We stayed together a few moments, sweating, exhausted, as the feeling within me returned to agonizing pain again.
I got up, heading for the bathroom, and my mate was right behind me. I felt like I couldn't bend, or sit, I just needed to relieve my pain. I stepped into the tiled shower area, spread my legs and let go. My mate stood and watched, as I poured out the biggest, strongest stream I had ever experienced. It went on and on, and while he looked, the swelling in my bottom parts gradually subsided.
Afterwards, it was several days before I could easily hold my pee more than an hour or so at a time - my bladder's revenge, I suppose. I can recall this now as I something I enjoyed in some sort of perverse way, but I've never felt like going through it again.