You arrive on the beach and drag yourself out of the water. You soon get exhausted as you're tail is quite heavy and all your muscles disappeared when you became female. You roll over onto your back and think about everything. How is your girlfriend going to respond to this? Will you ever see your parents again? Can you adjust to being a mermaid? All these thoughts wander your head as you lie there. Absently your hand drifts up and down your body until it lands on one of your breasts.
"Hey that felt good..." You think to yourself.
"Hey maybe i might... No can't do that! This is wrong, I'm not even meant to have these i'm a guy" You argue with yourself.
"Ah what the hell might as well make the most of this" you think to yourself.
You slowly begin massaging your breasts ("Wow this feels great!" you think as you do it), you being stroking your now erect nipples. You continue at this for sometime becoming more and more aroused.
"Mmmmm..." you moan softly as you continue.
Your other hand reaches for your crotch region attempting to find and stroke your vagina. You realize as a mermaid you do not have a vagina and feel disgusted to admit that you're quite disappointed. Suddenly your breasts start shrinking as your hair recedes back into your head and your body re muscles. Your sparkly blue tail splits into two legs and changes back to flesh as your penis regrows. You realize you're turning back into your old self.
"Yes i'm me again!" You shout in your deep male voice. "Mind you i was beginning to get used to that whole mermaid thing..."
You decide it'd be best to waste no more time on this island. You run to the water and dive in. Suddenly you feel a strange feeling wash over you. Your chest expands, you hair lengthens and your legs fuse into a sparkly blue tail.
"God dammit!" You exclaim in a once more female voice.
You realize that when you're dry you're a human male and when water, or at least sea water is touching you, you become the female mermaid.