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Vixens is a hentai OVA based on the works of U-Jin, released from August 1995 to April 1996. It contains a variety of stories, starting with a parody of Doraemon in which a nerd in his late teens summons an android catgirl from the future.
Miracle Alien (Episode 2)
Doreimon eats so much at Ujita's house that she ends up looking pregnant.