Johnny swam and leapt through the sea with the greatest of ease. Becoming a merman was the greatest thing to ever happen to him.
"This is the life." Johnny thought to himself. "No work, no more money worries, no clothes to wear, just being able to swim carefree in the sea all the time."
Johnny stopped for a little breather, and then, he had a rest on some coral.
Suddenly, it was then he developed strange pains on his human body. Well, the top half of it, anyway.
His nipples began to feel rather sensitive.
Then, he saw his arms. All the hair on his arms receded, and his fingernails became longer.
"Wow." he said. "My fingernails seem to be growing! How amazing!" As he said this, his voice seemed to crack, sounding somewhat slightly more female.
Then, he felt his beard. It seemed to be receding into his face, and soon, it was clean shaven.
"My beard!" Johnny exclaimed in horror, as his voice almost sounded female.
Suddenly, huge breasts grew, and his hips and waist shrunk, changing his body to a more female shape.
Johnny was now a mermaid!
"Oh me, oh my!" Johnny said, upon seeing her new body. "I'm a mermaid!"