Inyutsu no Yakata THE ANIMATION

Original: 淫術の館 THE ANIMATION

Meru is a sister from an Elf family who wants to find her sister Syl who suddenly disappears. After finding out where her sister was located, her sister was in a Villa desire satisfaction where the Villa could satisfy the desire of lust with many of the Tentacles in it. Meru is trapped inside the villa with many Tentacle. (Source: Nekopoi and Has Been Translated and Edited)