Atlantic Salmon Girl (Patreon)

Genies are notorious for misinterpreting wishes.  Now to be fair, being trapped in a bottle or lamp for hundreds or thousands of years could drive anyone slightly mad.  It might definitely leave them less cooperative than they might be.  Then there's the whole business of the geas to perform.  Not much chance to practice when you are trapped in a bottle.  Probably the most difficult factor is the language shift.  No one speaks the languages that the genie learned to understand when trapped.

Whatever the reason, when Giselle told the genie she wanted to be a mermaid and the genie didn't understand she tried to help by saying "One of those half woman half fish sexy creatures."  She would have liked arms, of course.  Once the genie had deposited her in the nearby stream and vanished, she realized she couldn't rub the bottle to summon the genie to correct the mistake.  And there was the now impossible to resist compulsion.  She MUST swim upstream, she MUST carve a nest in the stream bed, she MUST lay her eggs.  Then she could return here and figure out how to get that genie out of the bottle to grant her second wish.

Photo Credits:
Woman: https://www.deviantart.com/mjranum
Fish: https://www.deviantart.com/betaDraconis