Ikuiku Succubus Saikyouiku

A middle-aged professor with a strong sexual appetite, Busujima Tanehisa, is trapped by an otherworldly succubus named Lima Grimalkin. While he is immobilized by a spell, Lima begins to masturbate him, and due to his excessive sexual desire, she entrusts him with the task of re-educating the succubi who failed their exams. He is introduced to two failed succubi, Iko Bicorn and Ruku Orcus, who initially display a rebellious attitude, but are subdued by a magical bell. And so begins the orgasmic re-education of the succubi!