final boss difficulty please help

I need help finding a BL, I know it's a Japanese bl and there was probably only like one or two chapters uploaded. It had beautiful art and it was about three sea creatures? I don't know if MC was a mermaid or some type of sea creature? I think one of the ML's was like half lower octopus or something? There was like another hot guy too who kissed him under water. They are all under water. This was probably like last year or two years ago. I know for sure it's not completed, after my lists got all mixed up and lost I can't find it. Please helppppp