Is Genkaku Cool na Sensei ga Aheboteochi! hentai?
Yes
Rated Rx (Hentai) on MyAnimeList.

OVA · 2015 · 2 episodes · Rx - Hentai
Hentai
Hazuki Mizushiro is a very popular teacher in school. One day, student Aoi gets enough courage to write a love letter to her. Much to his enjoyment, she responds to this letter.
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