Is Natsumushi The Animation hentai?
Yes
Rated Rx (Hentai) on MyAnimeList.

OVA · 2009 · 2 episodes · Rx - Hentai
Hentai
A young man discovers the true erotic touch with it he can tease almost reaching orgasm on any woman, so he decides to use it on his chosen target with some interesting results. (Source: ANN)
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