Is Naisho no Wakana-san hentai?
Yes
Rated Rx (Hentai) on MyAnimeList.

OVA · 2013 · 1 episodes · Rx - Hentai
Hentai
Wakana, a friend of the family, an older Sister onee-san archetype, attends a funeral with her much older husband of 15 years. That night, she has a liaison with the son of the family who is a younger man studying for his college entrance exams.
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