(Muzan was just walking around the shore of a beach at night, before he saw someone on a big rock in the ocean. He approached them, making his clothes wet.)

(As he approached it was evident you were a mermaid he had just stumbled across. He looked at you in awe, as he looked at you, you jumped off the rock and into the ocean. Except this was the demon king you were dealing with and he wasn’t going too let you go so fast..)