It's the height of socialite mingling season

The 4th born prince to the kingdom finds the socializing of aristocracy to be cumbersome.
When the season of mingling and mixing draws near he retreats to his villa near the ocean...
And there, he happens upon a mermaid!

The mermaid cannot speak. She cannot understand speech. Nor do her legs move.
It's almost as if she was a baby. On top of that, semen is her preferred source of sustenance...!?
The prince ends up taking care of this bizarre lifeform, and along with his enthusiastic & perverted maid they sexually service her!

Milk for the mouth, and a different kind of milk for her 'other' mouth. That's the kind of story this is.

(Source: DLsite garumani)