"Don't be afraid, I won't hurt you." You say to the young man as you plant a gentle kiss on his lips. "Soon, you will know the wonders, and pleasures, that I know."
You drag the young man underwater as his breathing becomes labored. Removing his clothing, he soon starts breathing normally once again. You back away to admire the changes taking place now.
His face rounds into a feminine shape; lips developing a deep pink color as his eyes are framed in violet eye shadow. His shoulders narrow as his arms thin and hands shrink. he clasps his chest as two mounds swell, developing into C-cup breasts. His waist pinches in and hips widen.
Now comes the moment you've been waiting for. His legs slam together and the flesh begins to merge. What's left of his manhood is swallowed by HER ever changing limb. Your own womanhood pulsated with anticipation as the curves of her leg muscles straighten and turn bright, shimmering shades of violet and pink as scales sprout. Her feet shrink away as her toes develop webbing, lengthen and thin to nearly nothing as they flare into a beautiful pink and violet fin.
In her new female voice, the new girl said. "I'm a m... m... mer..."
"Mermaid," you finish, "and, I must say, more stunning than I thought." You swim to her and take her in your arms, she's still nervous.
"W... Why did you do this to me?" She said, slowly calming down in your embrace.
You flash a seductive smile before giving a much more passionate kiss on her lips, this time, both of your womanhoods began to stir. "That's why."