Shelly pov
As I swam to find someone to change, I noticed a young couple swimming far from shore. "Bingo" I said to myself and swam to them as fast as I could.
Alex POV
I went for a swim with my friend Tereza and we decided to swim further away from the shore so that no one would disturb us. "We're quite far away I think, ouch" before she could finish she shouted as if someone had done something to her. "What happened to you?" I asked "I don't know, something stuck me in the leg" she said, quite scared "I think it was an aww, something stuck me in the leg now too".
NO ONE POV
Shelly just watched with a smile as she went about her work, waiting for it to begin. After a while, the pair began to writhe in pain and their legs began to come together, their hair grew longer, their skin rejuvenated and their breasts enlarged, but for Alex the changes were much more pronounced, his sex changed and he continued to writhe in pain.
Theresa's POV
When the pain subsided and I was able to straighten up I noticed that I no longer had legs but a long dark blue mermaid tail, and to add to that my hair had gotten longer and was the same color as my tail, and my breasts were bigger now I had D cups.
When I looked in front of me I saw a mermaid with long black hair and a long black tail, "Alex is that you" I asked cautiously she looked at me and said" what happened to us Teresa, why am I a mermaid, Alex started to panic so I hugged him and tried to calm her down. "don't worry we'll find a way to get back to normal." but because I was scared too I started crying and so did Alex, so we hugged even tighter and cried into each other's arms.
Shelly POV
when I saw their emotions afterwards I felt a bit bad, my mom told me that people can have a problem with it before they get used to it, so I decided to show them and try to explain it to them.