Johnny admired his new merman self. He seemed like a single unit, there was no longer any distinction in his eyes. The tail was a part of his torso and his torso was a part of his tail.
SUDDENLY!!!
Johnny could feel pains on his body. WELL, THE TOP HALF, ANYWAY.
First was at his head; his small beard somehow receded into his head, and his hair grew longer.
He then soon felt all the hair on his arms FADE away, and his fingernails became like that of a woman's.
SUDDENLY!!! AGAIN!!!
His voice began to crack, suddenly becoming feminine.
"OMG!" he said, in a voice that sounded half his own and half female. "What-what's happening to me?"
Suddenly, he developed sharp pains on his body. His waist & hips shrunk and huge breasts developed.
Within seconds, Johnny Fishernon had turned into a female version of himself. Johnny watched as his former male self's clothes vanished into thin air.
"Wow!" Johnny said, admiring her new self. "I'm a mermaid!"