Are Mothra and Godzilla a couple

There are a lot of Fanfictions and Fan Art going around about Godzilla and Mothra the king and queen of the monsters of the monsterverse. People think they're a couple but why do they think this? Are they really a couple?
Fanart and Thumbnail
https://www.deviantart.com/fallenangel5414/art/Legendary-cute-couple-785553860
Music - Fluidscape by Kevin MacLeod

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Видео Are Mothra and Godzilla a couple канала Alteori