Is Aneki... My Sweet Elder Sister The Animation hentai?

OVA · 2007 · 4 episodes · Rx - Hentai

Hentai

Takumi just cannot stop fantasizing about Saki-senpai, her voluptuous body just stands out anywhere. One day she talks to him on the train and they become friends. Whenever he can, Takumi stares at her form, always getting a hard-on. The next day he finds out they have the same fetish... and so the story begins. (Source: AniDB)