As you realize that you can't get out of the pool. You suddenly feel very odd but it feels god at the same time. Then you look at your chest and see that your nippels and breasts are growing larger. "what the!" You say in alarm.
Your nippels are now boobs and your hair is beginning to grow longer and turn blonde! "what!" you say in a new femine voice. Seashells suddenly appear and cover your new boobs and a necklace of coral appears around your neck. Your body becomes more slender and sexy and eventually it's over.
You are now a Mermaid! This feels weird, but you feel very good at the same time. What do you do you now!