Joanne and I were still laying side by side in the surf, temporarily exhausted by our lovemaking. As I rubbed my hand against her mer-tail, I thought again of how much it reminded me of the texture of a dolphin's tail.
As my hand reached the point just above Joanne's waist where her tail turned to regular skin, I noticed that tail seemed to continue farther up than it had before. I stopped my rubbing and looked closely. The black of her tail was indeed slowly creeping up her body. I looked at Joanne's arms and saw that they were slowly shrinking in length but flattening out. As the black spread to Joanne's shoulders, what was left of her arms flattened into fins. When it continued up her neck, her hair seemed to be absorbed into her skin and her face stretched out. When the black color that had started at her tail had covered her entire body, it faded to a dark gray.
I was shocked to realize Joanne had turned into a dolphin!