Is Itsudatte My Santa! hentai?
No
Rated R+ (Mild Nudity) on MyAnimeList and not tagged as Hentai.

OVA · 2005 · 2 episodes · R+ - Mild Nudity
Comedy, Ecchi, Fantasy, Romance, Shounen
Mai, a Santa in training, appears in front of an unlucky boy named Santa on Christmas Eve, promising him that she will make him happy for one night.
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