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If your starting point is the bow of a ship why not a mermaid fantasy? Or maybe a normal fisherman picks up grateful castaways, that pretend to be injured requiring a thorough examination but actually want to have sex with a sexy fisherman.
Or better still.
A Pornstar gives lessons on how to masturbate on a boat. After some dialogue she talks about sex positions and requires some help....
Here's your starting point
https://www.wilde-online.info/the-fisherman-and-his-soul.html