Ikuiku Succubus Saikyouiku

This is an anime adaptation of the Visual Novel by DWARFSOFT.

One day, Busujima Tanehisa, a middle-aged teacher with a strong libido, finds himself trapped by another-world succubus named Lima Grimalkin. In order to test Busujima, Lima immobilizes him and begins to give him pleasure. Once satisfied, the succubus offers him to become a rehabilitator in order to help succubes failing several times on their exams.
Therefore, Busujima quickly finds himself having to take care of two succubes named Iko Bicorn and Ruku Orcus.