As you part, you find yourself floating motionless in the water, unable to move even though you want to get away.
Andrew smiles slightly. "Don't worry, my freind," he says smoothly, "everything will be just fine." He swims back to your ear, "You want to return to the fountain, immediatly. You want to become a beauitful mermaid. Then you want to find me again."
Strangly, as you gaze into his eyes, you find that you do want to do that. Wordlessly, you turn and swim back to the fountain and climb in without hesitation. You watch as your legs merge into a more flexable tail, your breasts push out and your hair flows away down your back. In just seconds, you look more like Joan!
You look over your new body with delight, then swim back to find Andrew where you left him. "Mark?" he asks with a slight smile.
You nod, but still can't seem to say anything.
He smiles again, "Don't worry, it's just part of the hypnotic suggestion. You'll get your voice back in a few days. Don't worry about the changes, by the way. Nothing the fountain does is really permenant. You could even become a human male again if you wanted." He smiles as he pulls you closer, "The problem is that mermaids have terrible memories. They live and love for the moment."
He kisses you deeply, making your head swim. "By the time my hypnotic suggestion wears off in a couple days, you won't remember being human, or male. You'll just be another member of my hareem."