Underwater

A few months ago while fishing with my friends in the open water, I fell off the boat and drowned. My friends said, that my body was found 2 weeks after the accident. They found me alive in a nearby island that uninhabited.
I don't remember that, what I do remember when I drowned that there was a bunch of naked women swam towards me and pulled me up, and they put me in that island. Then one of the said, "You're now one of us, sister." and they left. I know its kinda weird, and I only felt the hole thing was like a dream sequence.

I begin feeling the changes a few weeks after I've been rescued. Everytime I took a bath, or whenever my skin has contact with water, I could feel some weird sensation down in my groin. What shook me the most when I went to swim, and after a few minutes in water, my whole body changed into a female body. I was so shocked, grabbed my towel to cover my bare chest and dry myself. When I dried myself, soon my body will return to my male self. This is weird.

I told this to my best friend, and he doesn't believe me. So I took him in his boat, and we went to the deep water. I asked him to jump into the water, and he followed me in. He saw my body transform, and now he believes me. In my female body, I saw how big his junk was and it instantly turned me on. So, here I am fucking with my best friend underwater, experiencing sex as female for the first time, underwater.