Source: https://www.dlsite.com/maniax/work/=/product_id/RJ365779.html

summary:

テンタクル娘×ショタっ子の触手責め120%&丸呑みプレイ!

僕の家は海沿いの温泉宿。
とある晩、朔の日だけに現れるという「海神様」に出くわしてしまう。

お供え物を置いてそっと逃げようとしたんだけど、なぜか海神様は僕に興味を持ってしまったみたいで……?

Trans (MTL):

120% Tentacle Torture & Whole-Swallowing Play with a Tentacle Girl!

My family runs a hot spring inn by the sea.
One night, I happened to encounter the "Sea God"—a deity said to appear only on the night of the new moon.

I tried to leave an offering and slip away quietly, but for some reason, the Sea God seemed to take an interest in me...