Is First Love hentai?
Yes
Rated Rx (Hentai) on MyAnimeList.

OVA · 2012 · 3 episodes · Rx - Hentai
Hentai
Based on the manga by Osuzu Akiomi. Episode 1: The story is about a brother Ani and his younger sister Kasumi who begin developing feelings towards one another. Episode 2: It's a love story of Sahara Satoshi and Aoba Chinatsudo walking to the same school. Episode 3: Is the story of Makoto and Kouichi. (Source: AniDB)
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