Is Haramasete Seiryuu-kun! hentai?
Yes
Rated Rx (Hentai) on MyAnimeList.

OVA · 2011 · 2 episodes · Rx - Hentai
Comedy, Harem, Hentai
It seems that everyone is fighting over the main character Seiryu-kun's genes!! They've even made a competition out of it! However, little do they know of the suspicious plot behind the whole situation. In any case this is a crazy school love comedy adventure! An adventure of an upperclassman and her friend trying to be impregnated! (Source: dlsite)
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