On the other hand, he barely qualifies as a merperson in general. It makes no sense when the character in question is a dude. MerMAN? I know that it's a fairly literal translation of the original title, but the 'maid' in 'mermaid' is supposed to be referring to 'maiden' - that is, a lady. This may be purely pedantic, but shouldn't this be called Selfish Mr. I had issues with this from the moment I read the title. So, it turns out that the answer to ' How do you have gay sex with a merman?' is 'Like everyone else, because mermen are no different than any other human.' Things become complicated when Kaioh is beckoned home by his family for a royal event, and those who oppose them decide that the best way to lash out at Kaioh is through Kanan. Kaioh is rude and domineering, but he soon grows fond of Kanan and his sensitivity. The man, Kaioh, was merely napping - he apparently is a mermaid prince, and soon enough he moves himself into Kanan's place so he can take advantage of a bigger bathtub and a loser to serve him as a companion and servant.
Kanan goes to confront his neighbor only to find a half-naked man unconscious in the bath. He comes home one day to discover that the apartment above his isn't so much leaking water as it pouring forth a waterfall past and onto his own. Kanan is a weepy and deeply insecure young man.