This is an idea I had while watching videos of shows with sexy women in mermaid costumes with fish tails. I was thinking of a sci-fi story in which these girls performing during hours underwater get a new kind of invisible skin layering as "dry suits", and even some sort of implanted breathing apparatus that gives them a few minutes of autonomy underwater without any visible equipment. The girls then start wearing their skin layering out of the water too, because it makes them feel sexy. They also use special underwater colored contact lenses and wigs, and like to change their whole appearance. Their gear is improved even more so that they have special valves implanted in every body orifice, and they also get custom vaginal vibrators that they wear and control invisibly. They become special enhanced women that are very sought after, like a special caste. The story could be an interview with one of these women, or maybe a dialogue between a couple of them, sharing and comparing their experiences.