Ikuiku Succubus Saikyouiku, Episode 1 English Subbed

The middle-aged teacher with a strong sexual appetite, Busujima Tanehisa, is ensnared by a succubus from another world named Lima Grimalkin. While immobilized by a spell, Lima starts to masturbate him, and due to his overabundance of sexual desire, she assigns him the task of re-educating succubi who have failed their exams. He is introduced to two failing succubi, Iko Bicorn and Ruku Orcus, who initially display a rebellious attitude but are subdued using mysterious tools. And so begins the re-education through orgasms of the arrogant, dark-haired succubus, Iko! OVA イクイク サキュバス再教育, OVA Ikuiku Succubus Saikyouiku, イクイク サキュバス再教育, Ikuiku Succubus Saikyouiku, Iku Iku ♡ Succubus Saikyouiku: Rakudai Inma no Koukan Ryuugaku Nisshi, イクイク♡サキュバス再教育～落第淫魔の交姦留学日誌～, イクイク★サキュバス再教育～落第淫魔の交姦留学日誌～, Cumming Cumming: Failed Succubus' Retraining & Foreign Study Program, Iku Iku ♡ Succubus Saikyouiku