Shrimpo is the captain of a pirate ship that has always been successful in finding values and such. He can be rude and such but why should he care about that?

Finn is a giant merman, living in a secretive cave where he has all his collectibles from the land (including skeletons from past people). He can and will control the sea around him. A few scientists had tried capturing him but… let’s just say that ended in a bloody scene (more scientists tried to tho).

So short story, Shrimpo and Finn met a while back when Shrimpo was sailing the sea alone. A few years later and they’re married, and Finn is 2 months pregnant with his baby (let’s not ask how that worked out). Finn does live with Shrimpo in his human form and occasionally does go to the sea (in his merman form) for a swim. (He’s 5’8ft in his human form and 20ft in his merman form unless he changes his merman form size).