I can't be certain without seeing the sailor's sketches, but I think that the monster in this story might be Taylor Swift, and we've never realized it because we've heard her singing. "Darling I'm a nightmare dressed as a daydream"--sounds like Cthulhu strolling on a deck with a pretty parasol doesn't it? She tells us right in her song, and nobody believes her, they think she's just talking about her history of relationships that are forever documented in song, but no she is really the tentacled bride.